Grid overlay. Main operations with 3DT grids are implemented in the module Overlay. The input grid must have the same spatial reference (dimension, extent, number of ticks, layers, rows and columns). The selected operation is performed for each cell and the result is saved into the output grid. Arithmetical operations: • addition, • subtraction, • multiplication, • division, • minimum value, • maximum value, • average of values, • percentage. Overlay operations: • stamp: all not null values of the first grid are transferred to the corresponding cells of the second grid. The values of the other cells of the second grid remain unchanged. • mask: all null values from the first grid are transferred to the second grid. In other words, cell values in the second grid remain unchanged wherever the cells of the first grid are not null. • null: cells of the second grid are set to null wherever the cell value of the first grid is not null. The other cells of the second grid are unchanged. If an error occurs during the operation (e.g. division by zero), the null value will be written to corresponding cell of the output grid.
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Sources: End User License Agreement, End User License Agreement, End User License Agreement