EC: Contour__Grid math

Summarize:

The Grid math command creates a new grid file that transforms the M values of a single grid file or combines M values from multiple grid files. The output grid file is based on javascript commixture arithmetic. It is performed on corresponding nodes with the same row and column coordinates from the input grid files, and the result of the calculation is placed at the same coordinates in the output grid file.

Example:

1. Add two contour grids. They must have the same Origin coordinates, Spacing X, SpacingY, number of rows

  and columns.

2. Click [Contour] | [Grid math] command.

2. Pop up the [Grid math (javascript)] dialog.

3. Funtion = Math.abs(DemoGrid1) + DemoGrid2*2

4. The Grid math command results in the creation of a new contour map.