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# RockWork - Estimating Volume based on picture (Electrical tomography)

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```Hi,
```

I'm actually working as a geophysicist and we recently pur our hands on Rockwork. After some manipulations, i m confronted with a problem for which i cannot find a simple and effective solution.

Context :

We use images (electrical tomography imagine indicating the different horizons observed (based on resistivity)) that we lay out in 3D. However for some cases we would like to estimate the volume of these different horizons. I specifiy that we dont have precise XYZ coordinates of these horizon or GridMap.

So far the ideas i have explored have been :

- Using the 3D diagramm (Rockplot 3D file) and digitizing points. These are then used to create a Grid ;

- Creation of a colored mask (by third party software)on the horizon and attempted to create a 3D model by color recognition ;

- Finally the last try was to create fictitious drillings along the image and to define here the depths of the various horizons. Even if this method seems the most efficient (accuracy of measurements), it should take a long time to be carried out.

I take advantage of my debut on the Rockwork forum, to try to find the most effective solution possible ?

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Interesting problem.  If you set up your images for display within the Images \ Vertical \ Multiple program and then use the Graphics \ Images \ Vertical \ Images -> XYZC program, you will get a list of fifty-zillion XYZC points, one for each pixel within each image.  I'm thinking that we could add a filter to this program whereby the user specifies a color so that the program would extract the XYZ for the uppermost and lowermost pixel with that color for every column within the image.  The output would be a X,Y,Z1,Z2 list with Z1 being the elevation of the highest point and Z2 being the elevation of the lowest point.  Grids based on this data could then be used to compute the volumetrics.  But ... there is an important caveat; the selected color would have to be unique which means that gradational colors within the image and other intervals with the same color would cause problems.  The solution is to use an image manipulation program such as PaintShopPro to "posterize" the images and then flood-fill the image to make sure that each zone has a unique color.  If this sounds viable, send me an email (jim@rockware.com) and we'll start coding.  - Jim Reed.

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