Changes between Version 8 and Version 9 of UserDocs/GdalWarp

Timestamp:

Aug 20, 2009, 5:27:30 AM (15 years ago)

Author:

Even Rouault

Comment:

advertise using -co TILED=YES

UserDocs/GdalWarp

@@ -105 +105 @@
 
 
-== `-co COMPRESS=` is broken! ==
+== [GeoTIFF output] `-co COMPRESS=` is broken! ==
 ''When I compress an image with gdalwarp the result is often many times larger than the original! ''
 
@@ -116 +116 @@
 See ticket:1688 and linked discussions for a fuller explanation.
 
+Alternatively, you can use a VRT file as the output format of gdalwarp. The VRT file is just an XML file that will be created immediately. The gdal_translate operations will be of course a bit slower as it will do the real warping operation.
+
+{{{
+gdalwarp -of VRT infile tempfile.vrt ...options...
+gdal_translate tempfile.vrt outfile.tif -co compress=lzw ...etc.
+}}}
+
+== [GeoTIFF output] Use `-co TILED=YES` when possible ==
+
+Due to the way gdalwarp proceeds, when generating a huge output file (width > 100,000 pixels for example), you should consider producing a tiled GeoTIFF file if it is an option for you (some software will only read strip TIFF files). If you have a lot of RAM, increasing the maximum cache size and the working buffers of the warping algorithm as explained above might also help if you generate a strip TIFF file.
+
+
+