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r.compress manual: mention GRASS_ZLIB_LEVEL

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65118 15284696-431f-4ddb-bdfa-cd5b030d7da7
Markus Neteler 10 年之前
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      raster/r.compress/r.compress.html

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raster/r.compress/r.compress.html

@@ -156,6 +156,17 @@ single byte preceding each row.
 Since GRASS GIS 7.0.0, the default compression method for
 Since GRASS GIS 7.0.0, the default compression method for
  Integer (CELL) maps is deflate and not any more the RLE compression.
  Integer (CELL) maps is deflate and not any more the RLE compression.
 
 
+<h4>DEFLATE compression level</h4>
+
+If the environment variable <tt>GRASS_ZLIB_LEVEL</tt> exists and
+its value can be parsed as an integer, it determines the compression
+level used when newly generated raster maps are compressed using zlib
+compression. This applies to all raster map types (CELL, FCELL, DCELL).
+<p>
+If the variable does not exist, or the value cannot be parsed as an
+integer, zlib's default compression level will be used.
+
+
 <h2>EXAMPLES</h2>
 <h2>EXAMPLES</h2>
 
 
 Printing of current compression state:
 Printing of current compression state: