HyGEM project started !

Andrea Viezzoli | Thursday, 26 April 2012

The HyGEM project has started !

Aarhus Geophysics is very proud to inform the community that the HyGEM proect has started. It is a great project, aiming at integrating geophysics with hydrogeology-geology, in innovative ways. Aarhus Geophysics is leader of WP1. A short description of the project follows.  We will keep you posted on the developments.

The HYyGEM Proejct: Integrating geophysics, geology, and hydrology for improved groundwater and environmental management

In this project we will create tools for the direct and automatic integration of spatially dense geophysical and sparse geological data to construct hydrological models for knowledge-based groundwater resource management. This includes to:

Develop automatic methodologies for transforming spatially sampled geophysical data, using geological and hydrogeological data, to the framework of a hydrological model.

Use geostatistical methods to describe the correlation between the geophysical data and lithological/hydrological data and to assess the uncertainties from the automatization.

Demonstrate the benefits of spatially distributed geophysical data for informing and updating groundwater models in terms of their increased predictive power.

We anticipate the results will have a significant scientific and societal impact given that the issues are of high interest in many research groups world-wide. The individual elements will bring substantial insight into integration - particularly automatized integration - of large geophysical datasets into groundwater models that today remains an unresolved conceptual and technical challenge.

www.hygem.org

New from Aarhus Geophysics: Web Based Inversion Facility for AEM data

Andrea Viezzoli | Tuesday, 24 January 2012

Happy new year to all our subscribers. We start fresh the new year with a revised look of our newsletter, to convey more effectively the latest news, updates, services and projects from Aarhus Geophysics.

We do want to start with fireworks, announcing an innovative service which will appeal to many consultants and data providers: the Web Based Inversion Facility for Airborne EM data. This is a service for clients that no require our consultancy, or purchasing the Aarhus Workbench software, but still require and seek superior inversion output for which Aarhus Geophysics is renowned. The Spatially constrained inversion, based on exact 1D forward solution with 3D constraints, produces robust results without further approximations. Stop talking about CDIs to your clients, and start talking about actual depths to units.

Web based AEM inversion

Harvest years of development, the accuracy and proven reliability of the· Aarhus Geophysics's approach, methodologies and software. Apply it to your Airborne Electromagnetics Data, without having to buy any software or servers, or to learn how to use and manage them. Just upload your data (any AEM system) in, e.g.,· a Geosoft ® database to our secure site, provide some ancillary information to describe the project, let our experts run the inversion for you, and receive back the 3D conductivity models, with depth of investigation and data misfit, on e.g., Geosoft ® databases.

Upcoming events: ASEG 2012, booth and workshop

For those of you who will be attending ASEG in Brisbane next month, come and meet us at our booth, and we will be glad to show you how we can improve your AEM data output. You also still have time to register to our workshop on the Aarhus Workbench scheduled for 26/02/2012. See ASEG 2012 website for more info.

How to Grid themes and produce Maps with Aarhus Workbench

Andrea Viezzoli | Tuesday, 8 March 2011

Hi again to all our subscribers.

Here comes the fourth newsletter on "How to ...." carry out some specif task with our software. Directed to both expert old users and potentially new users, they illustrate, within the space limitations of a newsletter, one particular feature that allows carrying out a well defined task.

This time the topic is : "How to Grid Geophysical Themes and produce Maps with Aarhus Wokrbench".

As most of you probably know by now, ·the Aarhus Workbench features multiple extensive GIS modules dedicated to different models visualization and manipulation tasks. In this newsletter we are going to focus on the Surface Modeling module, which allows gridding any existing theme, and producing maps. The starting point is the Workspace Manager (see figure), where we select a data base query (dbq) containing pre-extracted geophysical themes, in this case average resistivity at different depth intervals. Refer to the second newsletter of this "How to" series to see how to produce these geophysical themes from· e.g., Airborne EM inversion results. Right-click on the dbq node, select Batch Griddind, and the forms on the right open. Many fields controlling the griding characteristics can be edited, e.g., the type of interpolation to be applied or the search radius. The dedicated Image form allows choosing e.g., colourscales, shading, transparency to be used for making maps from the grids.·

In just few clicks the template for gridding and visual appearance is set up, and the tasks are carried out in batch, using as many CPUs as are available. After few minutes, depending on e.g., grid size, all requested grids and maps are added to the Workspace Manager, and are ready to be displayed or exported.This figure shows the Workspace Manager tree, with selected the depth interval corresponding to the average resisitvity map visible on the right.

The same can be done with any other theme (e.g., depth to good conductor) extracted either from inversion results obtained within the Aarhus Workbench, or from any XYZ external file. This allows displaying in the same environment also diverse datasets like Magnetics data, or Digital elevation models.·

I hope this little example was of interest to some of you. Check out our future newsletters for other specific short tutorials on different Aarhus Geophysics software modules, or check out or website www.aarhusgeo.com for more information.

I would also like to take this opportunity to remind you about the upcoming Webinar on Inversion of AEM data, scheduled for March 24th. If you are interested and would like to join visit our website for details, or send us an email at webinar@aarhusgeo.com.

Best Regards

Ph.D. Andrea Viezzoli

Director

How to add a-priori from grid to AEM data inversion in Workbench

Andrea Viezzoli | Thursday, 10 February 2011

Hello everyone.

Here comes the third newsletter on "How to ...." carry out some specif task with our software. Directed to both expert old users and potentially new users, they illustrate, within the space limitations of a newsletter, one particular feature that allows carrying out a well defined task.

This time the topic is : "How to add a priori information from a grid to Spatially Constrained Inversion of AEM data with the Aarhus Workbench".·

In the Workbench, "soft" a-priori information, describing the expected geological variability in the area, is routinely applied to the Spatially Constrained Inversion, in terms of covariance of model parameters of neighbouring soundings. It is however possible to add also "hard" a-priori, from either conductivty logs, Grids, or directly from GIS. Let us illustrate how to add information from Grids. After running a first SCI, of e.g., HEM data, right-click on the SCI node, select New Inversion Node. After the node is created, right click on it, and select Add a-priori from grids or lines (see figure). Notice also the other options.

After this, the form in this figure opens, which allows adding from a grid either depth or elevation to layer boundaries (any layer set up in the SCI starting model), or layer resistivities. In this case we are adding a-priori information as elevation of (saline groundwater) layer to a Resolve (HEM) dataset. Each piece of information used as a-prior is then assigned an uncertainty estimate, describing how "hard" the constraints should be. Together with the noise estimate on the AEM data, the inversion will use the uncertainty on a-priori so that the final SCI output is a balance of all available information. Now the SCI with a-priori information from a grid is ready to run.

Upon completion of the inversion, the results are evaluated, and, if satisfactory, searched and displayed with the Aarhus Geophsyics GIS moduels, or exported.

I hope this little example was of interest to some of you. Check out our future newsletters for other specific short tutorials on different Aarhus Geophysics software modules, or check out or website www.aarhusgeo.com for more information. Click here for further reading on the Spatially Constrained Inversion.

I will also take the chance to remind you to sign in to our upcoming webinars on processing of AEM data. Please see our website for further info.

Best Regards

Ph.D. Andrea Viezzoli

Director

Series of Long Webinars on processing of AEM data

Andrea Viezzoli | Wednesday, 26 January 2011

Hi,

It has been a while since our last· webinar, and we would like to make up for it announcing a series of three Long Webinars, all linked to Airborne Electromagnetic data processing, Aarhus Geophysics style. The first one focuses on AEM data editing, the second one on AEM data inversion, the third on inversion results display and manipulation, all within the Aarhus Workbench software. The 3 webinars form a continuum, taking you from AEM system description and raw data input, to the final report maps. Attending all of them would allow you to follow the entire workflow, and give you an idea of how we approach AEM data processing at Aarhus Geophsyics. However, we will also cater for people that sign up to just one of them. Do not miss the chance to learn how we process AEM data (also your next survey, if you want us to), and to get acquainted with the software tools that you could use yourself to obtain great results.

The first webinar "Processing of AEM data in the Aarhus Workbench" is scheduled for February 22nd. In order to allow people from all continents to participate, we offer 2 time slots, either at 09:30, or at 16:00 CET. It will cover AEM raw data input, editing of navigation and EM data.

The second webinar "Inversion of AEM data in the Aarhus Workbench" is scheduled for March 24th. The 2 time slots available are either at 09:30, or at 16:00 CET. This webinar shows how to set up a constrained smooth and blocky inversion and how to evaluate the output.

The last webinar "Inversion results manipulation and display in the Aarhus Workbench" is scheduled for April 28th. The 2 time slots available are either at 08:30, or at 16:00 CET. Here the focus is on the functionalities of the GIS modules of the software, which allow producing different thematic maps, depth slices, profiles, etc...

Each webinar is meant to last a couple of hours. If you are interested in attending any of them, or have any query, please write to webinar@aarhusgeo.com. If you do want to sign up, remember to indicate the title and the preferred time slot. We will try to accomodate all requests.

It is all for now, but stay tuned also for another upcoming series of Short Webinars, which will focus on just one particualr feature of a given module of the Aarhus Software world.

Best Regards

Ph.D. Andrea Viezzoli

Director

How to produce Geophysical Themes with the Aarhus Workbench

Andrea Viezzoli | Monday, 24 January 2011

Hello everyone.

Here comes the second newsletter on "How to ...." carry out some specif task with our software. Directed to both expert old users and potentially new users, they illustrate, within the space limitations of a newsletter, one particular feature that allows carrying out a well defined task.

This time the topic is : "How to produce Geophysical Themes from inversion results with the Aarhus Workbench".·

As you may or may not know, the Aarhus Workbench features extensive GIS modules that, among the others, allow searching through the models output from inversion of different data types (e.g., Airborne and groundbased EM, DC ...) to produce specific Geophysical Theme Maps. This section shows how to do it. Identify within the Workspace tree the data base query (dbq), containing the desired resitivity models. These can be either output from inversions of, e.g., AeroTEM, SkyTEM, HeliTEM, VTEM or Resolve data carried out within the Aarhus Workbench, or models produced outside of the program, and simply imported into it. Right click on the dbq, and select New Theme (see figure). After choosing Models (Mean Resistivity maps etc.) the Geophysical Theme form opens. The dropdown menu in the figure below shows the different options.

The themes that can be produced range from average resitivity (conductivity) at different depth (elevation) intervals, to properties (i.e., resistivity, thickness or depth) of given layers, depth to conductive basement, clay thinckness. A completely customizable model search is also available. In order to produce average resistivity maps at different depth intervals, as shown in figure above, all is needed is to enter the minimum depth, the number of steps, and their thickness. The Aarhus Workbench then searches through the entire model space linked to the chosen dbq, and produces the desired themes, as reported in this figure.

The themes can then easily be gridded and then colour coded in bacth to produce the average resistivity maps with just· few clicks, but this will be the topic of another "How to ..." newsletter coming up shortly.

I hope this little example was of interest to some of you. Check out our future newsletters for other specific short tutorials on different Aarhus Geophysics software modules, or check out or website www.aarhusgeo.com for more information.

Best Regards

Ph.D. Andrea Viezzoli

Director

How to invert jointly groundbased TEM and DC data with SiTEM/Semdi

Andrea Viezzoli | Tuesday, 18 January 2011

Hello everyone.

We are happy to announce the first one of a new, regular series of newsletters focused on "How to ...." perform some specific task with different modules of our software. Directed to both expert old users and potentially new users, they illustrate, within the space limitations of a newsletter, one particualr feature that allows carrying out a well defined task.

We start this series with the newsletter: "How to invert jointly groundbased TEM and DC data with SiTEM/Semdi".·

·It is possible to use TEM and DC methods complementary, taking advantage of their different sensitivities to a given resistivity model parameter. This section shows how to do it with the SiTEM/Semdi package. After having edited the TEM data in SiTEM (decoupling and late time noise assessment), load it into Semdi, and invert it. Load the corresponding DC (or CVES) sounding, and invert it as well. Analyze the results of the independent inversion. Double click on, e.g., the TEM output file, add the corresponding DC file (see Figure) and edit the constraints (the coupling) between TEM and DC model parameters. The constraints can be locked, so that both soundings have to converge to exactly the same model (Joint inversion), or they can be left a bit loose, so that the inversion will accommodate for anisotropy, static shift or any cross calibration issues, allowing the two sounding to converge to slightly different models (Mutually Constrained Inversion, or MCI). Prior information on, e.g., depth to layers can also be added simply in the same form. For those interested in further reading on MCI of TEM and CVES data, see Christiansen et al. (2007).

Click submit, the inversion runs in the background, and then you can inspect the results in the dedicated panels of Semdi. This other figure reports an example of mutually constrained inversion results. The larger panel shows data and forward responses (DC in black, 3 segment TEM in colours, straight lines represent forward, error bars the input data), the long panel on the right the ·1 D models that fit the 2 datasets, the table at the bottom reports the 1D model and the model parameter sensitivity analysis, for the mutually constrained inversion. The blocky inversions can be run with arbitrary number of layers. The results can be displayed in Semdi, exported as ASCII file, or, in case of large surveys, imported into the Aarhus Workbench for showing as color-coded long cross section, or for producing thematic maps, e.g., depth to layers and average resistivity maps at different depths.

I hope this little example was of interest to some of you. Check out our future newsletters for other specific short tutorials on different Aarhus Geophysics software modules, or check out or website www.aarhusgeo.com for more information.

Best Regards

Ph.D. Andrea Viezzoli

Director

Paper in GEOPHYSICS:"Quantification of modeling errors in airborne TEM caused by inaccurate system description"

Andrea Viezzoli | Wednesday, 5 January 2011

Warm greetings to all our subscribers, and happy new year !

I hope you had a good break. Let me invite you to have a look at the latest paper by Christiansen, Auken and Viezzoli, by the title "Quantification of modeling errors in airborne TEM caused by inaccurate system description", which has just been published in Geophysics (Vol 76, No. 1; http://link.aip.org/link/?GPY/76/F43). The aim of the paper is to contribute to the understanding of some of the critical factors in the modeling/inversion of airborne TEM data, e.g., from AEROTEM, HELITEM, SKYTEM, VTEM, or TEMPEST. The article shows how, even the ideal, perfectly accurate airborne TEM dataset (we all wish such thing existed), can produce inaccurate ouput models if the transfer function of the AEM system is not modelled correctly during the inversion. A suite of synthetic TEM soundings from nominal Helicopter TEM systems resembling some of the existent HTEM sytems was forward modeled for the study. The authors have then given a systematic, robust look at how inaccurate modeling, during the inversion, of the different components of the system(s) transfer function affect the models recovered. The components taken into account were low pass filters, Tx waveform, timing between Tx and Rx, integration over gates, altitude errors, and combined effects. The abstract reads "... The results showed that all of these parameters should be measured and modeled accurately during inversion of airborne TEM data. If not, the output model can differ quite dramatically from the true model. Layer boundaries can be inaccurate by tens of meters, and layer resistivities by as much as an order of magnitude. In the worst cases, the measured data simply cannot be fitted within noise level .... ".The effects are obviously model dependent, but the general conclusions are relevant to both exploration and hydrogeological applications. The more ingenious will find relevant the discussion section, which tries to reassume the main potential impact that the effects studied may have on different real airborne TEM systems without ever mentioning them by name !

Best Regards

Ph.D. Andrea Viezzoli

Director

Latest paper published on Preview on accurate inversion of SkyTEM and Resolve data

Andrea Viezzoli | Thursday, 16 December 2010

The latest issue of Preview (149, pp. 23-31) features a paper by Viezzoli et al., by the title Accurate quasi 3D versus practical full 3D inversion of AEM data – the Bookpurnong case study. It presents an hydrogeological application from Bookpurnong, in Australia, where both Resolve and SkyTEM had been flown. Follow the link if you are interested in the comparison of the inversion results from the two systems, or in the issue of accuracy in the modeling of the system transfer function in the inversion versus the dimensionality of the forward response. Authors claim that, in these envronments, it is more crucial to model the AEM system correctly than applying full 3D inversion. 

Position available at Aarhus Geophysics

Andrea Viezzoli | Monday, 6 December 2010

Aarhus Geophysics is happy to announce the opening of 1position for a Geophysicist, jointly with the Hydrogeophysics group of the University of Aarhus.

The successfull applicant will hold a Ph.D. in Geophysics, and a solid theoretical geophysical background in electromagnetic methods. The candidate must demonstrate experience in theoretical developments, methodology development, data processing and in-terpretation and the application of the methods in geological and hydrological modelling.

Please follow the link for more information

Aarhus Geophysics en "REFORMA"

Andrea Viezzoli | Wednesday, 24 November 2010

Aarhus Geophysics has been invited to promote Danish expertises in the environmental field on a special issue of the prestigious Mexican newspaper "REFORMA", in correspondence to the COP16 meeting in Cancun, Mexico. We presented the potential of Airborne Electromagnetics applied to Groundwater management, based on our international experience in this sector. Earlier this year,  Aarhus Geophysics had been invited to round table and B to B meetings with main stakeholders of groundwater monitoring and management in Mexico, among which Conagua and Semarnat, to establish bilateral cooperation and knowledge exchange in this field.

Siga este link para version en español

Process and invert VTEM, AeroTEM, HeliTEM and any other HTEM data with the Aarhus Workbench

Andrea Viezzoli | Tuesday, 2 November 2010

Time has come to start approaching your Helicopter TEM data in a new way, to demand and extract more robust information from them.

Aarhus Geophysics announces the release of a general HTEM module that allows complete advanced processing and inversion of virtually every helicopter TEM system on the market today, e.g., VTEM, AeroTEM, HeliTEM. You can now enjoy the full capability of the Aarhus Workbench software for detailed data editing, inversion to smooth and blocky models, results evaluation and display, production of final pdf maps. In true Aarhus Geophysics Aps style, the aim is to go beyond bump anomaly finding, fast approximate transforms or inversions, or any other forms of qualitative appraisal of the AEM data, and to produce quantitative results instead. The aim is to take you ... from Data to Knowledge

Import your AEM data in the GIS environment of the Aarhus Workbench, describing the full System Transfer Function, and perform:

• advanced processing of navigation, altimeters and tilt metres data
• decoupling, filtering, and noise assessment of the EM data
• full non linear quasi-3D spatially constrained inversion
• constrained inversion with prior information from boreholes or other geophysics-derived layer boundary 
• results evaluation, in terms of Data Residual, Model Parameter Sensitivity, Depth of Investigation
• model display, as horizontal maps in depth and/or elevation, and cross sections
• custom searches of model space and thematic maps, e.g., depth to good conductor

Please refer to our website www.aarhusgeo.com for some more information about the Aarhus Geophysics software, for some selected references and case studies.

Looking forward to replying to any question on the HTEM module

Best Regards

Ph.D. Andrea Viezzoli

Director

Latest paper published on GEOPHSYICS on limitations of 1D inversions in extreme 3D cases

Andrea Viezzoli | Wednesday, 27 October 2010

The latest issue of Geophysics (75, 179-188) features a paper by Ley Cooper, Macnae and Viezzoli, by the title Breaks in lithology: Interpretation problems when handling 2D structures with 1D approximation. The paper compares the shortcomings of CDI obtained from software based on fast forward transforms (e.g., EMFLOW) and of inversion results based on exact forward solutions and laterally constrained inversions (LCI, Aarhus style) applied to a very tough 3D synthetic model. See how the LCI produces better results than the CDI, in terms of both accuracy of recovered depths and thicknesses, and of lateral extent of resistive gaps, and where instead, it too, fails to recover features which are too small or that end too abruptly. Refer also to this older paper about LCI that dwells on the maximum of layers slopes that can be recovered correctly with LCI.

Using Airborne EM to reduce the nitrate load to the streams: the NICA project

Andrea Viezzoli | Monday, 27 September 2010

Aarhus Geophysics is happy to promote the visibility of a challenging and important project, for "Nitrate Reduction in a Geologically Heterogeneous Catchment", by the acronym NICA (http://nitrat.dk/index.shtml), to which in contributes in terms of data processing and inversion. The goal of th eproject is "to contribute to the development of cost-effective strategies for fulfilling the goals in the EU Water Framework Directive by identifying robust agricultural areas for which only a limited part of the nitrate leached from the root zone reaches the streams."

Aarhus Geophysics will be co-developing and testing advanced processing methodologies for the use of very early times channels of the HTEM transients.

Aarhus Geophysics invited to present at Geofluid 2010

Andrea Viezzoli | Monday, 27 September 2010

Aarhus Geophysics will be participating to a workshop on applied Geophysics, held on October 7th at Geofluid 2010 (http://www.geofluid.it/), the large groundwater related show and conference held every two years in Piacenza, in northen Italy. We will be presenting the Applicability of Airborne Electromagnetics to Groundwater Management, within the session:"Prospezioni Geofisiche Specifiche Tecniche". Everyone is invited to participate.

First International workshop on AEM applied to groundwater held in Italy

Andrea Viezzoli | Monday, 20 September 2010

Aarhus Geophysics organized and hosted c/o the Polo Tecnologico di Navacchio, in Pisa, the First International Workshop on AEM applied to groundwater. The successful event, which attracted about 20 professionals from central and northern Italy, was the first of this kind in the country, and aimed at increasing the awareness on AEM and its sound application and practices for hydrogeological applications. The slides with the contribution of the different speakers can be obtained directly from Aarhus Geophysics. The workshop was granted a number of credits for continuous education program from the Italian association of Geologists.  

Aarhus Geophysics picks up another award at Geocanada 2010

Andrea Viezzoli | Monday, 20 September 2010

Aarhus Geophysics picks up the important award for Best Geophysical Oral Presentation at the GeoCanada2010 convention, for the paper:"Advances in Surface-Groundwater modelling in lagoon environment with Airborne Electromagnetics and high resolution Seismic: Example from the Venice lagoon", by Andrea Viezzoli (Aarhus Geophysics) and co-authors Pietro Teatini (University of Padova), and Luigi Tosi (ISMAR-CNR-Venice).

This award follows the Honourable Mention for Excellence in Geophysical paper received at SAGA 2010 conference, for the paper:" Increased accuracy in mineral and hydrogeophysical modelling of HTEM data via detailed description of system transfer function and constrained inversion", by Andrea Viezzoli, Anders Vest Christiansen (Aarhus University) and Esben Auken (Aarhus University), and the even earlier Best of ASEG 2007 Paper. All these papers either have, or will be in due time, expanded in full papers in international journals, that you can download here. 

Aarhus Geophysics contributes to the International Workshop EGM 2010

Andrea Viezzoli | Wednesday, 28 April 2010

Hi all

Aarhus Geophysics Aps participated to the International Workshop EGM 2010, which was held in Capri between in April(http://www2.ogs.trieste.it/egm/)
The workshop, whose theme was "Adding new value to "Electromagnetic, Gravity and Magnetic Methods for Exploration", offered a very stimulating set of presentations on the state of the art of these methods.
Aarhus geophysics contributed to the program with an oral presentation within the EM inversion session, about some important aspects in modelling AEM data for hydrocarbon exploration.

Best Regards

Ph.D. Andrea Viezzoli

Director

Aarhus Geophysics offers inversion of the Geoscience Australia Tempest and VTEM EM datasets

Andrea Viezzoli | Wednesday, 28 April 2010

Hi all,

Aarhus Geophysics would like to announce that is it available for processing and inversion of the Tempest and VTEM electromagnetic datasets from the Paterson Province and Pine Creek survey, in Australia. These EM datasets are available from Geoscience Australia, as a mean to promote the exploration in this region.

As you probably know already, we are experts in the field of processing and inversion of AEM data from different systems. Our methodologies and expertises are particularly suitable for Uranium exploration, and have already been applied to this target.

We therefore offer to the companies with tenements or different interests in the region a robust inversion of the EM data (both smooth and with few layeres) that could be very valuable for the geological interpretation and the pre-exploration phase.

For any further information, please contact us at info@aarhusgeo.com.

Ph.D. Andrea Viezzoli

Director

Come and meet Aarhus Geophysics in North America in May

Andrea Viezzoli | Monday, 26 April 2010

Hi all, 

this is not the usual newsletter informing about software update or Webinars. We just wanted to invite you to visit us at one of these two very important upcoming conferences in north America. You will get a chance to meet us in the exhibition area, to inquire about our products and services, and maybe also to attend some of our oral presentations in the area of AEM applied to groundwater management and exploration.

The first conference is the GeoCanada 2010 conference, which will be held from May 10th to 14th in Calgary, Alberta (http://www.geocanada2010.ca/). You will find Aarhus Geophysics at booth number 1022. We will be giving two talks, one in the Potential Field & Electrical Methods in Exploration session, and one in the Groundwater Exploration and Management 2: Aquifer scale methods session. Look out for them in the program.

The second one is World Environmental & Water Resources Congress 2010, held in Providence, Rhode Island, between May 16th and 20th (http://content.asce.org/conferences/ewri2010/index.html). The booth number is still to be confirmed, just look for us in the exhibit all. We will be giving a talk, together with our co-authors, in the Saltwater Intrusion Modeling and Management of Coastal Aquifers II session. 

So, it is all for now, I will leave for other newsletters coming up shortly the exiting news about software release, and consulting projects we are currently involved in.

Looking forward to seeing you in North America soon. 

Best Regards

Ph.D. Andrea Viezzoli

Director

WEBINAR: Increased accuracy in inversion of AEM data. VTEM examples.... and more on Venice lagoon

Andrea Viezzoli | Thursday, 14 January 2010

Hi all, first of all happy new year to everyone.

It has been a while since our last Webinar. It is time to get back on track, and to announce what we hope will be a popular Webinar, by the name:" Increased accuracy in inversion of AEM data. VTEM examples".

The Webinar, based on a paper that at the last SAGA conference earned the special mention for technical excellence, will explain how we tackle the inversion of data from a generic helicopter TEM system. We will touch topics such as altitude, low pass filters, bias etc.... We will then use some VTEM data to present results, both from mining and groundwater applications.

The Webinar is scheduled for tuesday the 2^nd of February 2010, at 16:00 central European time or at 09:30 central European time, and it is meant to last about 1 hour. The double slot should allow interested people in all continents to participate. The Webinars are open to all interested parties. If you want to join in, please sign up by sending an email to Webinar@aarhusgeo.com. Please specify the time slot that suites you.

I would like to take the opportunity to give visibility to a paper published few days ago on Geophysical Research Letters (Viezzoli et al.) by the title: Surface water-groundwater exchange in transitional coastal environments by airborne electromagnetics: The Venice lagoon example. Do not hesitate to contact us if you are interested in the article.

Remember also to check out our website www.aarhusgeo.com for a complete overview of our products and services. 

Best Regards

Ph.D. Andrea Viezzoli

Director

Maps, maps, maps and Venice

Andrea Viezzoli | Wednesday, 9 December 2009

Hi all,

It has been a while since last newsletter of Aarhus Geophysics. They have been however very busy times, and here we present some of the most relevant news.

At software level, the Aarhus Workbench has undergone a robust developing phase on the GIS components, and on the QC of inversion results. On the first issue, we have completely revolutionized the colour scale interface, created a shading option for horizontal maps, and activated the possibility to create comprehensive print ready pdf maps. Regarding the second issue, the user can now visualize, with just few clicks, different maps on the GIS component of the parameters that allow to QC inversion results. These include, for example, data residual, difference between frame altitude input and output, model parameter sensitivity analysis, etc.

Our consultancy in terms of AEM data processing, inversion and survey planning is also continuing with a number of new projects both for private and public clients worldwide. As an example, we processed the first ever AEM survey dataset from the Venice lagoon, in Italy. The results of this project are very promising in terms of applicability of AEM data to hydrogeological modeling within and underneath wetlands, lagoons, and surface waters in general. We will keep you posted when the paper we are working on will be accepted. For the moment, have a look at the expanded abstract.

Best Regards

Ph.D. Andrea Viezzoli

Director

Aarhus Workbench chosen by Geoscience Australia for processing > 30000 line km of SkyTEM data

Andrea Viezzoli | Sunday, 23 August 2009

I take the opportunity to let you know that, also thanks to a cooperation between Aarhus university and Geoscience Australia, the Aarhus Workbench has been chosen by Geoscience Australia as the software for processing and inversion of a large SkyTEM survey. The survey is part of GA's "Broken Hill MAR Project"project.

Best Regards

Ph.D. Andrea Viezzoli

Director

Meet us in September at Near Surface (Dublin) and SAGA (Swaziland)

Andrea Viezzoli | Sunday, 23 August 2009

Hi all, 

this is not the usual newsletter informing about software update or Webinars. We just wanted to invite you to visit us at one of these two upcoming conferences. The first one is the Near Surface 2009 conference, which will be held from Sept. 7 to 9 in Dublin (http://www.eage.org/events/index.php?eventid=110). You will find Aarhus Geophysics at booth number 16. The second one is SAGA 2009, held in Swaziland between between 13 and 18 of September (http://www.sagaonline.co.za/2009Conference/index.htm). There look for booth number 4. Come and ask us about our products and services, and let us show you how we can get more out of your AEM data. 

Best Regards

Ph.D. Andrea Viezzoli

Director

Aarhus Geophysics can now invert Aerotem and VTEM data, and the Workbench display EMFlow results

Andrea Viezzoli | Monday, 20 April 2009

Hi,

Aarhus Geophysics would like to give you an update regarding the latest developments in our software, and in our consulting activities.

The Aarhus Workbench now has a general importer for models resulting from inversion of AEM data performed outside of the Workbench. This allows to import models, together with data and forward responses, generated with inversion software (be it based on approximate or exact forward responses) other than our own. It is then possible to use the powerful visualization tools embedded in the workbench to inspect and present these results. In practice this allows also the user to display and compare within the GIS environment of the Workbench the results obtained from different inversion packages or techniques (e.g., EMflow, from Encom http://www.encom.com.au/).   

On the consulting side, we are happy to announce that we can process and invert with the Laterally Constrained  Inversion both AeroTEM data (from Aeroquest http://www.aeroquestsurveys.com/english/index.php) and VTEM data (from Geotech http://www.geotech.ca/) for you, before these systems are fully supported in the Aarhus Workbench.

Remember also our upcoming Webinar on "inversion of HEM data with the Aarhus Workbench", scheduled for April 22^nd, at 14:00 (Central European time). If you are interested, and haven't done it yet,  please sign up by sending an email to Webinar@aarhusgeo.com.
 

Thanks for you time, 

Best Regards

Dr. Andrea Viezzoli

Director

Webinar on inversion of HEM data in the Aarhus Workbench

Andrea Viezzoli | Monday, 20 April 2009

Hi

First of all let me take this occasion to thank the 23 delegates that attended our workshop on Processing and Inversion of AEM data given in Adelaide just after the ASEG conference last month. It was a great privilege, and also a challenge, to have such a diverse audience, spanning from consultants working in the mining sector to governmental agencies dealing with groundwater issues, to providers of airborne surveys. We will probably do it again in Sydney.

However, the real reason for the newsletter is that we are happy to announce another Aarhus Geophysics Webinar to be given soon, by the title "Inversion of HEM data in the Aarhus Workbench".

The Webinar will focus mainly on importing of HEM data (e.g., RESOLVE data) into the Workbench, inverting them, and assessing the results. If there is time, it will also touch briefly the topic of creating maps and presenting results in the GIS environment. However, the latter will be the topic of a dedicated future Webinar.    

The HEM inversion Webinar is the third of a series of Webinars, covering different modules of our software that we started at the beginning of the year, and will continue in the future.

The Webinar is scheduled for wednesday the 22^nd of April 2009, at 14:00 central European time, and it is meant to last about two hours. Hopefully this time will suite most people in all continents. Let us know if you can't make it at that time, and we may set up another Webinar dedicated to people living in some remote place ! 

The Webinars are open to all interested parties. If you are interested, please sign up by sending an email to Webinar@aarhusgeo.com.
 

Remember also to check out our website www.aarhusgeo.com for a complete overview of our products and services. We will however send another newsletter shortly with information on the latest developments in Aarhus Geophysics, both on software and services sides. Just a teaser here ... different HTEM systems...

Best Regards

Dr. Andrea Viezzoli

Technical Manager

Workshop on AEM at ASEG 09 and Webinars

Christian Sodemann | Tuesday, 6 January 2009

Hi and happy new year to everybody.

We are happy to announce that, in the very near future, Aarhus Geophysics will host both a workshop on inversion of AEM data at the ASEG 09 conference, and a series of Webinars on selected modules of our software products.

The workshop on inversion of AEM data will take place on Februrary the 26^th, in correspondence to the end of the ASEG 09 conference, held in Adelaide, in Australia. It will cover aspects of processing and inversion of AEM data from different airborne systems, both time and frequency domain, and it will be conducted using the Aarhus Workbench software. More info on the workshop are available from http://www.sapro.com.au/ASEG/workshops.htm (workshop number 9). If you are interested, registration for the workshop is open on the ASEG website: http://www.sapro.com.au/ASEG/registration.htm. We will also be present at ASEG 09 as exhibitors, at stand 99.

This is the schedule of the first series of Webinars, which will focus on Sitem/Semdi, our software for processing and inversion of TEM data.

• Thursday the 22^nd of January at 21:00 (Central European time): processing and inversion of Protem 47/57 data.

• Monday 26^th of January at 21:00 (Central European time): processing and inversion of Terratem data.

The Webinars are open to all interested parties, but require some basic knowledge of TEM data processing and inversion. If you are interested in any of the Webinars, please sign up by sending an email to Webinar@aarhusgeo.com.

Other Webinars on other software modules (i.e., processing and inversion of SkyTEM data, of HEM data, of DC data, etc...) will be scheduled soon. Feel free also to write to Webinar@aarhusgeo.com to request a Webinar on a selected topic.

Remember also to check out our website www.aarhusgeo.com for a complete overview of our products and services (if you lack either the time or the capacity to process AEM data, we can do it for you).

Best Regards

Dr. Andrea Viezzoli

Technical Manager

New name...

Christian Sodemann | Thursday, 11 September 2008

Until recently, we were known as Skyware. We are happy to announce that as of September 1 2008 we are called

Aarhus Geophysics

The name was chosen to stress our close connection to University of Aarhus, its reputation and the research that is being carried out there. The name also reflects our key expertise: Geophysics. The name of our main product remains unchanged - the Aarhus Workbench.

Our aim is for Aarhus Geophysics to be associated with high quality software products and services in the field of geophysics.

New logo...

In connection with the name change, we launch a new logo. You can see it at the top of each page here on our website. We like it - and we hope you do, too.

...and new website

Now that we change the name and the logo, the time is right for kicking off a new website. We have tried to make it better and more intuitive than the old one, but please let us know if you miss anything on the webpages.