Changes between Version 4 and Version 5 of UserDocs/GdalWarp
- Timestamp:
- Feb 29, 2008, 1:25:36 PM (16 years ago)
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UserDocs/GdalWarp
v4 v5 97 97 * [Gdal-dev] Will increasing the RAM on a server increase the speed of gdalwarp? - http://lists.maptools.org/pipermail/gdal-dev/2007-July/013566.html 98 98 99 100 == How does `-et` Error Threshold work? == 101 By default gdalwarp uses a linear approximator for the transformations with a permitted error of (I think [FW]) a quarter pixel. This basically transforms three points on a scanline. The start, end and middle. Then it compares the linear approximation of the center based on the end points to the real thing and checks the error. If the error is less than the error threshold then the remaining points are approximated (in two chunks utilizing the center point). The error threshold (in pixels) can be controlled with the gdalwarp `-et` switch. 102 103 So if you want to compare a true pixel-by-pixel reprojection use `-te 0` which disables this approximator entirely. 104