[postgis-users] PostGIS Raster: Spec. for WKT and WKB?

Stefan Keller sfkeller at gmail.com
Fri Oct 22 06:56:10 PDT 2010


> Exact. There are lots of things that we could include/discuss in WKB for raster like:

Great. But I also specifically meant if the way of binary encoding is stable?
That's probably important for those application which read/write WKB
with their own means i.a. without PostGIS libraries.

-S.

2010/10/22 Pierre Racine <Pierre.Racine at sbf.ulaval.ca>:
>>> As I said: no. They are not specified in public. I wish there would have been a public spec to tell
>>me how to store raster but there is not.
>>
>>I'd like to understand and support this better:
>>
>>1. You write "They are not specified in public.": But now they are at
>>least in the sense of "PostGIS WKB", aren't they?
>>Now there is the PostGIS documentation
>>(http://trac.osgeo.org/postgis/wiki/WKTRaster/Documentation01) as well
>>as the source code publicly available.
>
> Ok. Yes in this sence they are public. But they are in no way issued by a standardisation organism.
>
>>2. Wen you say "I wish there would have been a public spec to tell me
>>how": Do you mean that there code/encoding gives still much room fore
>>enhancements? This would be an opportunity to be discussed but it also
>>would mean that "PostGIS WKB" would'nt be stable.
>
> Exact. There are lots of things that we could include/discuss in WKB for raster like:
>
> -I plan to add soon a flag to say if a band is only no data value.
> -Band's stats. Mean, max, min and maybe histogram.
> -More than one nodata value per band.
> -Band's name so we can refer to them by a name instead of by a number.
> -Color scheme descriptor.
> -Adding a table of nominal values. A kind of generalization of what is a color table but able to store nominal values as well.
>
> Etc...
>
> Pierre
>
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