Read Strings Into Grid
This function allows you to read in a string file and perform mathematical functions on individual fields (Z and/or description fields) for the grid and string file. For example, if the grid file contained Specific Gravity figures in the first descriptive field and the string file contained volume figures in the first descriptive field. The D1 field of the grid file could be multiplied by the D1 field of the string file to calculate tonnage figures. The resultant figure is written to the D1 field of the grid file.
To run this function: Choose File tools > Grid tools > Obtain grid values from string, or...
Note: You may perform mathematical
operations only on corresponding field values, i.e. both Z values or both
D1 values, and so on.
Define the string file
Location and ID number
Enter the Location and ID number of the string file that contains the data to be used to perform mathematical functions on the grid data. Only points in the string file that have matching co-ordinates in the grid file will be processed.
Define operations to perform during load
Number of operations required
Enter the Number of operations required and specify the Field and Operator to be performed for each operation.
The operators that you may select from are:
| = | Set grid value equal to string value. |
| + | Add string value to grid value. |
| - | Subtract string value from grid value. |
| * | Multiply grid value by string value. |
| / | Divide grid value by string value. |
| L | Set grid value to string value if the string value is lower than the grid value. |
| H | Set grid value to string value if the string value is higher than the grid value. |
Result
A file with the same name as the grid, with extension `.lst', will be created listing the rejected records. Records are rejected if they do not match a grid coordinate.