How to define a projection for a file with geo points?

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I have a HDF file that I want to convert to tif or ENVI file withSo I used:

I know the the +Proj of the original file is:"+proj=cea +lon_0=0 +lat_ts=30 +ellps=WGS84 +units=m"

so:

gdal_translate -of "ENVI" -a_srs "+proj=cea +lon_0=0 +lat_ts=30 +ellps=WGS84 +units=m" HDF5 file.h5 output.imgbut I found that the projection was not defined but instead I got this:

ENVI samples = 964 lines = 406 bands = 1 header offset = 0 file type = ENVI Standard data type = 4 interleave = bsq byte order = 0 geo points = { 0.5000, 0.5000, 83.63197327, 0.18672180, 32.5000, 0.5000, 83.63197327, 12.13693237, 64.5000, 0.5000, 83.63197327, 24.08714294, 96.5000, 0.5000, 83.63197327, 36.03733826, 128.5000, 0.5000, 83.63197327, 47.98754883, 160.5000, 0.5000, 83.63197327, 59.93775940, 192.5000, 0.5000, 83.63197327, 71.88796997, 224.5000, 0.5000, 83.63197327, 83.83817291, 256.5000, 0.5000, 83.63197327, 95.78838348, .......................................................................................................................................................................................................My question how to deal with geo points?



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