John Mitchell wrote:
Hi,
I have been reading over the mapserver raster documentation and I have a
few questions:
1.) It mentioned a 4 gb limit for GeoTiff files. Is this for GeoTiff
files or that GeoTiff's can only be tiled up to 4 gb. Is this 4 gb
limit an issue with mapserver or GeoTiff.
John,
The 4GB limit is inherent in TIFF, and it isn't specific to mapserver
in any way. Note that you can setup a tile index with my TIFF files
smaller than 4GB. There is no meaningful limit on the amount of data
that can be in a tileindex.
2.) Assuming the 4 gb GeoTiff limit then the GeoTiff would need to be
converted to Erdas Imagine (HFA) format. The Documentation said that
the Imagine format is already Tiled. Correct?
Imagine format is inherently tiled, normally with 64x64 blocks.
3.) Is the format the same to access an Imagine file as it is to access
a GeoTiff? I have a sample .map segment that I use to access a GeoTiff:
Yes, Imagine files are accessed the same way in mapserver as GeoTIFF files
are.
OUTPUTFORMAT
NAME png
DRIVER "GD/PNG"
MIMETYPE "image/png"
IMAGEMODE RGB
EXTENSION "png"
END
I'm not sure why this OUTPUTFORMAT declaration is in your email. It didn't
seem to relate to the text of question 3. But I will say that output formats
is to some degree a distinct issue from input raster formats.
Best regards,
--
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