Setting up Table Grid Sampling

If we have a table that has solids and volumes, but doesn't have any qualities for our material then we will want to set up Table Grid Sampling to interrogate our quality grids.

To access Table Grid Samples, simply right click on the table you are looking to interrogate, go to setup and then Table Grid Samples.

In the new window right click Table Grid Samples, select add then New Table Grid Sample and name it whatever you would like.

From here we can select the Table Grid Sample we have created and choose the folder on our computer that contains our grids from the three dots next to the Grid Folder box.

Within this folder, if your grids all start with the same prefix then we will manually enter that into the Grid Prefix box. In the example below we can see that all of the Grids start with MM, implying they were created in Micromine Origin & Beyond, so we will enter MM into this box.

The Solid Field will need to point at the solid on our table that we want to compare to the grids. This will most likely be your imported coal solid.

Now head down to the Range Mappings box and click the wand icon on the right hand side to open the wizard.

In this wizard we will be breaking our model down into the same way our grids are set up, this is most likely to be seam by seam so select Seam under Level and press apply.

Next click on the Field Mappings tab and press the wand again. This will read the grids and bring in all the different types of grids found in the folder. You can choose a Weighting and Default value for each if you would like. You will need to specificy which Field you want each grid to write to in your table. You can see how each weighting functions at the bottom of this article.

Now we can come back up to the Grid File Expression and see that by default it will take our prefix (MM) then add a Range Mapping (D, E or F in our example) and then add a Field Mapping (as, de, ph in our example) with a full stop in the middle and a g at the end and then try to read that grid. This maps perfectly to our grid names in the example folder, however might need some slight changes.

Divide percentage values by 100 will change the base of the number if the Field we have selected to write to is a Percentage type field.

Clear selected fields will whipe any fields being written to before writing to them.

The density grid is required to work out the field mappings if we are using the Tonnage weighting and should be directed to whichever grid is interrogated to find our density.

Once all the setting have been defined hitting calculate will write the numbers to the table. All of the setting will be remembered for the next time the tool is run.

Different types of Weighting:

Area: This will take the average number in the grid over the entire solid, not taking into account thicker parts of the solid being weighted more heavily.

Volume: This will take the average number in the grid over the entire solid, giving more weighting to areas that are thicker than areas that are thinner.

Tonnage: This will take the average number in the grid over the entire solid, giving more weighting to areas that have the highest volume multiplied by density.

Min: This will take the minimum number across the solid.

Max: This will take the maximum number across the solid.

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