Changes between Version 2 and Version 3 of FAQCoordinateSystemsAndProjections
- Timestamp:
- Nov 30, 2007, 9:50:20 AM (16 years ago)
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FAQCoordinateSystemsAndProjections
v2 v3 10 10 11 11 Yes, you can use the gdalwarp utility program or programmatically use the [http://www.gdal.org/classGDALWarpOperation.html GDALWarpOperation] class described in the [http://www.gdal.org/warptut.html GDAL Warp API Tutorial]. 12 13 14 == Why doesn't GDAL automatically choose the datum transformation? == 15 16 There is no such thing as an accurate "default" set of datum transformation parameters for a datum. OGR uses (NADCON) by default, which is the most accurate available for North America, but in the general case (worldwide) this is very hard to determine and there normally is no such thing as a default. The transformation that should be used depends on the exact area covered, accuracy required etc. In other words, user beware and do your homework. 17 -- http://casoilresource.lawr.ucdavis.edu/drupal/node/259 18 -- http://www.nabble.com/issue-warning-to-user-when-performing-datum-shift-%28OGR%2C-GDAL%29-t2029971.html