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
However, it doesn't help because my application developed in Java and it
uses gdal-java (GDAL JNI)
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?


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