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?