[Gdal-dev] Accessing Raster Attributes
wesp at gdv.com
Thu Mar 13 11:13:04 EST 2003
This one contains class_names:
It doesn't look that easy from my point of knowledge, so maybe you like to
have a look at it.
Your help is greatly appreciated.
At 11:56 12.03.2003 -0500, you wrote:
>Oliver Wesp wrote:
>>what we like to do, is accessing the class_names attribute form ERDAS
>>img-Files (hfa). We thought **GDALGetRasterCategoryNames(
>>GDALRasterBandH hBand ) should to the trick, but it points to
>>GetCategoryNames() and this function returns null. Maybe we're on the
>>wrong track anyway but this looks like it's not implemented.
>>We would not hesitate to develop this by ourselfs but maybe this has done
>>before or someone can point us to the right direction.
>This hasn't been done yet, but would be a worthwhile improvement. If you
>want to implement this, you would need to override the default implementation
>of the GetCategoryNames() method on the HFARasterBand class in gdal/frmts/hfa.
>You can use the low level HFA API to get the category names from the Erdas
>file though I don't know the structure off hand. You can use the "hfatest"
>application in gdal/frmts/hfa to dump the file structure to try and pick out
>the location of the category names.
>If this gets to messy for you, email me a small .img file with category names
>and I will look into implementing it.
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Dipl.-Geogr. Oliver Wesp
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