Jump to content
RockWare Support Forum
Vincent Verswijvel

Extracting geochemical (I-data) per stratigraphy layer

Recommended Posts

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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×
×
  • Create New...