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Why are tif files so large when using geotiffwrite?
david hill
on 8 Nov 2023
Latest activity Reply by Walter Roberson
on 8 Nov 2023
Hello.
I use readgeoraster to read in a 25MB geotiff. I then turn around and immediately write out the data with geotiffwrite. The resultant file is now 250MB.
What is the explanation for this 10x increase in file size? The data read in are 'single' format. And that is the exact data I am writing out.
Dave
4 Comments
Interesting. That made the output files 65MB. It came with this warning:
Warning: TIFF library warning - 'TIFFWriteDirectorySec: Creating TIFF with legacy
Deflate codec identifier, COMPRESSION_ADOBE_DEFLATE is more widely supported.'
> In Tiff/close (line 709)
In map.geotiff.internal.writeGeoTiffFile>@()close(tiffObj) (line 51)
In onCleanup/delete (line 25)
In map.geotiff.internal.writeGeoTiffFile>writeImage (line 68)
In map.geotiff.internal.writeGeoTiffFile (line 36)
In geotiffwrite (line 28)
In computeEref (line 105)
Thank you, I will try that...I already tried it, but clearly I was not using the syntax correctly.
Have you tried using a TiffTags parameter https://www.mathworks.com/help/map/ref/geotiffwrite.html#d126e71430 to set Compression to Deflate ?