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GRIDREGGRIDREG files type are used for rectangular grids of digital terrain models ( DTM), represented by matrices with points equally distributed on the surface, with real values normally computed by mathematical models .(see figure below).
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The first line in the file is the keyword GRIDREG. This line starts the identification section, which has to be present. The GRIDREG entity must have the information section and has to have the keyword GRIDDEF followed by six parameters, they are all mandatory and are separated by blanks, in the following order:
Notice that the only mandatory line in the information section in an ASCII file for the GRIDREG entity, is a line that has the keyword GRIDDEF. Following the information section, which is ended by the keyword INFO_END, starts the data lines for the regular grid. These values are separated by a blank. The sequence END indicates the end of the data section in the file. The general format for the ASCII file for the GRIDREG entity is
presented in the following example:
A rectangular grid, represented by an ASCII file, as shown in the example above, might be a component of the same IL, from the numerical model, storing also the samples (contour lines and/or spot heights), triangular grid and output contour lines. NOTE: When exporting a numerical IL with rectangular grid entity types, the option Grid Reg. in the " Exporting" window, the GRIDREG file is created. When exporting, by default, the file name extension is "spr", with the "_GRR" suffix added to the IL's name, that is, *_GRR.spr. However, for importing, the file should have only the "spr" extension, in case the file was created in a different system.
[ LINES ] [ POINTS ] [ POINT2D ] [ SAMPLE ] [ GRIDREG ] [ TABLE ] [ TEXT ] [ POLYGONS ] [ NETWORK ] [ NETWORK_OBJECTS ]
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