- an inversion and modelling software for 2D geoelectric data under Windows9x/NT-
Using SensInv2D you may easily create forward models, calculate the model response and invert your field data of arbitrary geometry. SensInv2D is based on subroutines provided by Peter Dietrich. There are three major components of the program.
First, within the sensitivity analysis you may investigate sensitivity behaviour of your selected electrode configuration and you may calculate an "overall coverage", like the coverage calculated in seismic tomography. This may help you to decide whether or not a chosen survey design will produce a more or less homogeneous coverage.
Second, the modelling tool supports you via an interactively setup of a model. You may create just only one model or you may create several models, in case you like modelling the spreading of a tracer plume. After creating the models you may calculate the model response, i.e. the apparent resistivities for your model. Again, you may model response for several chosen models.
Third, inversion can be carried out using three different inversion schemes: Back Projection, SIRT and MSIRT. You may assign different wheigting schemes and sharpening filters, according to your survey design. As a special tool, you may incoorporate constraints or limits. Perhaps, you do have electric borehole data and you like keeping them fix during iteration. To do this, you can easily set up a "constraint model", in which you may add the boreholes then assigning an index, indicating that these values have to be fix.
... , of course there are many other features like importing
refraction models, import other software formats, direct import of
data for your equipment, pre-defining surveys and many more.
Here is a selection of some software options:
You may import other software or hardware formats, if you like cross-checking results. This is a recommended way if you just have one routine to invert your data.
On the other hand, you may pre define surveys. Actually, you like creating crosshole datasets for modelling or even your real field geometry. Then you may use the PreSelection menue, which allows you to define survey geometry and automatically creates all files needed for modelling.
Our modelling tool allows easy creation of models with almost arbitrary geometry. You may define layers, or other elements like circles or rectangles.
Three different inversion schemes may be used: Back Projection, SIRT and MSIRT. For each inversion scheme you have full control of all parameters needed. Even you may load forward models or determine the output file frequency.
If you do have geometry from a previous seismic survey you may load this model and use it as starting model. There is a direct import option for REFLEXW models.
You may display your inversion results, show pseudo sections or display the iteration curve. Different color bars may enhance your target. Files are stored in ASCII on disk, so you may feel free to display your data with other graphic software.
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