Vincent Verswijvel Posted April 20, 2020 Share Posted April 20, 2020 Hi all I am looking for a way to extract geochemical data from a specific layer. For example, I have put all the arsenic levels into the I-data tab of Rockworks (17) and I have a stratigraphy model. Is it possible to know all the statistics (mean, st.d., etc.) of arsenic in a layer of my choosing? I have not modelled the geochemical data, is this necessary? Kind regards Vincent Verswijvel Link to comment Share on other sites More sharing options...
Mitch Posted April 20, 2020 Share Posted April 20, 2020 If you model the arsenic you'll have several choices for extracting the level data. First you can create an I-Data Plan map for the elevation of your choice which creates a grid of the values. You can the use the Grid Statistics program on the grid. Secondly you can use your stratigraphic layers to filter the arsenic model and then run Solid Statistics on the filtered model. Mitch Link to comment Share on other sites More sharing options...
Vincent Verswijvel Posted April 20, 2020 Author Share Posted April 20, 2020 Hi Mitch Thank you for your response. I will definitely look at this. However, it may seem a little weird, but it is not preferable to model the arsenic for my project. Do you think it's possible to get the statistics from the raw input, so without modelling the arsenic? Kind regards Vincent Link to comment Share on other sites More sharing options...
Mitch Posted April 20, 2020 Share Posted April 20, 2020 Somebody else may suggest a way to do this without modeling but if you use the Closest Point method with a small distance cutoff there will be no manipulation of the values. Just the original values and nulls. Link to comment Share on other sites More sharing options...
Vincent Verswijvel Posted April 20, 2020 Author Share Posted April 20, 2020 Now that I think of it, this sounds very obvious. Thank you very much, this is very helpfull. Link to comment Share on other sites More sharing options...
Molly Posted April 20, 2020 Share Posted April 20, 2020 Hi Vincent, You can get a statistics report for the raw data using the I-Data | Statistics program. On the right side of the window, turn on "Spatial (XYZ) Filtering", specifically an Upper Surface and Lower Surface. Click the Adjust Filtering Options button to browse for those surfaces. Molly Mayfield RockWare Inc. Link to comment Share on other sites More sharing options...
Vincent Verswijvel Posted April 21, 2020 Author Share Posted April 21, 2020 Hi Molly Thank you so much. This is exactly what I was looking for. I have, however, 1 question. Filtering my boreholes on arsenic, I get 40 non-zero values across 11 different boreholes. When I create the statistics report, the population (Non-null) is equal to 80. This is the exact double. Is this as intended? I calculated the mean myself and this corresponds to the mean in the statistics report. Kind regards Vincent Link to comment Share on other sites More sharing options...
Mitch Posted April 21, 2020 Share Posted April 21, 2020 I'd look at your cutoff distance, half the cell size should work but if the cell size varies in the x, y and z spacing then it will be more hit or miss. Mitch Link to comment Share on other sites More sharing options...
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