Thanks Even, your suggestion works, I found an example here for Python that could help others with this powerful feature: https://gis.stackexchange.com/a/140053/17733
On 05/17/2018 09:02 PM, Even Rouault wrote: > > On jeudi 17 mai 2018 11:33:40 CEST Bang Pham Huu wrote: > > > Hi, > > > > > > I have a hard problem to find the width/height of a 2D GeoTiff file > > > which is reprojected from a source CRS (e.g: EPSG:4326) to target CRS > > > (e.g: EPSG:3857) without running gdalwarp. Because, the file could be > > > large (GBs) and I don't need the projected output file, just need the > > > width/height of it. > > > > > > What could be done with gdalwarp is: > > > > > > gdalwarp -s_srs EPSG:4326 -t_srs EPSG:3857 full.tif full_3857.tif > > > > > > gdalinfo full_3857.tif > > > > > > Size is 879, 811 (width/height). > > > > > > I've searched a lot and what seems to be good without doing the real > > > projection is this gdal function: GDALSuggestedWarpOutput2 > > > > https://github.com/OSGeo/gdal/blob/106c8288e7a05f4efc1a588c5a3b2da7ec52d915/ > > > gdal/alg/gdaltransformer.cpp#L354. However, it doesn't help because my > > > application developed in Java and it uses gdal-java (GDAL JNI) > > > > https://search.maven.org/#artifactdetails%7Corg.gdal%7Cgdal%7C1.11.1%7Cpom > > > as library. Unfortunately, I cannot find this GDALSuggestedWarpOutput2() > > > from gdal-java http://gdal.org/java/overview-summary.html then cannot > > > invoke this C++ function from my application to test. > > > > > > Can anyone please give me a hint to solve this problem? > > > > Hi, > > > > You can use gdal.AutoCreateWarpedVRT() which will create a in-memory > warped > > VRT without doing the actual warping. > > > > http://gdal.org/java/org/gdal/gdal/gdal.html#AutoCreateWarpedVRT-org.gdal.gdal.Dataset- > > > > and query the dimensions of the returned Dataset > > > > Even > > > > -- > > Spatialys - Geospatial professional services > > http://www.spatialys.com >
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