Calculating the Z Value of the Surface at a Point
The Grids | Calculate | Point Sample command samples Z values from a grid at any point. To perform the operation, create a data file with X and Y coordinates for the points you'd like to sample and click the Grids | Calculate | Point Sample command.
Example
Consider a grid file that ranges from zero to 10 in the X and Y dimensions, and you want to determine the value of the surface at the points (1,3) and (4,2) on the surface.
-
Open a new worksheet window with File | New | Worksheet.
-
In column A, type the X coordinates for the points you wish to find the Z value, e.g. type 1 in Row 1 and 4 in Row 2. In column B, type in the Y coordinate, e.g. type 3 in Row 1 and 2 in Row 2. Add as many points as you want into the data file by entering the coordinates for each point into a different row in the data file.
-
Use the File | Save As command and enter a name for the data file, for example PointSample.dat. Click Save and the XYZ data file is created.
-
Click the Point Sample command.
-
Specify the Input Grid, XY Data, and Data Columns in the Point Sample dialog.
-
Click OK and a worksheet is opened with the Z values from the points you entered.
See Also
Calculating the Agreement between a Grid and the Original Data File