The program prompts the user to enter the name of the TIFF raster file to be converted and the name to be assigned to the GRASS raster file to contain the resultant image. Currently "TIFF/uncompressed", "TIFF/PackBits-compression" and "TIFF/deflate" formats are supported. Other compression schemes may not be read correctly. LZW compression is not supported due to UNISYS patent.
If a TIFF World file exists with an extension of "tfw", "tifw", "TFW", or "TIFW", it will be used to set the boundary coordinates and cell size. Rotation in the TIFF World file is not supported (second and third numbers). If no TIFF World file exists, the user should adjust boundary coordinates stored in the cell header after import using r.support .
A sample TFW file opened up would look like:
6.00 0.00 0.00 -6.00 1709053.00 807714.00 Line 1 - Cell size in the "X" direction Line 2 - Rotation term for the row Line 3 - Rotation term for the column Line 4 - Cell size in the "Y" direction Line 5 - Easting value of insertion point "X" Line 6 - Northing value of insertion point "Y"Note: The y-scale (E) is negative because the origins of an image and a geographic coordinates system are different. The origin of an image is located in the upper-left corner, whereas the origin of the map coordinate system is located in the lower-left corner. Row values in the image increase from the origin downward, while y-coordinate values in the map increase from the origin upward.
GRASS 5.0 team
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