Changes between Version 19 and Version 20 of UserDocs/GdalWarp


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Timestamp:
Jun 26, 2024, 10:23:38 AM (3 weeks ago)
Author:
dbaston
Comment:

migrated to website

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  • UserDocs/GdalWarp

    v19 v20  
    8989   * [http://lists.osgeo.org/pipermail/gdal-dev/2007-July/013571.html gdal-dev: Will increasing the RAM on a server increase the speed of gdalwarp?]
    9090
    91 == How does `-et` Error Threshold work? ==
    92 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.
    93 
    94 So if you want to compare a true pixel-by-pixel reprojection use `-te 0` which disables this approximator entirely.
    95 
    96 Source:
    97    * [http://lists.osgeo.org/pipermail/gdal-dev/2008-February/016251.html gdal-dev: Gdalwarp speed comparison]
    98 
    99 
    10091== [GeoTIFF output] `-co COMPRESS=` is broken! ==
    10192''When I compress an image with gdalwarp the result is often many times larger than the original! ''