![]() ![]() NoData nodes are not included in the maximum. NoData nodes are not included in the minimum. Ny is the integer number of grid lines along the Y axis (rows) Nx is the integer number of grid lines along the X axis (columns) The identification string DSAA that identifies the file as an ASCII grid file. The general format of an ASCII grid file is: When the maximum X value is reached in the row, the list of Z values continues with the next higher row, until all the rows of Z values have been included. The second Z value is the next adjacent grid node in the same row (the same Y coordinate but the next higher X coordinate). This can also be thought of as the southwest corner of the map, or, more specifically, the grid node of minimum X and minimum Y. The first Z value in the grid file corresponds to the lower left corner of the map. The Z values are stored in row-major order starting with the minimum Y coordinate. The listing of Z values follows the header information in the file. The fields within ASCII grid files must be space or tab delimited. ![]() GRD contain five header lines that provide information about the size and limits of the grid, followed by a list of Z values. ![]()
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