[postgis-devel] GDAL WKT Raster Driver weekly report #3

Jorge Arévalo jorge.arevalo at gmail.com
Wed Jun 17 13:26:50 PDT 2009


Hi Pierre,
I've read the introduction again, and totally agree: shows confusion,
concept mixing. But I must say that I wrote these sentences very late at
night, and in different moments, when I had finished the rest of the
document. Now, I think that they have no sense...

I understand the limits between :
- the work in GDAL (A driver able to read a new type of raster: a new
PostGIS type called "WKT Raster")
- the work in PostGIS (this new type that adds raster support in PostGIS)

This new PostGIS type will be able to be integrated in raster/vector
operations with vector data: ST_Intersection, ST_Union, etc. This
integration between raster and vectors in GDAL is related with other methods
like, as you said, GDALPolygonize, GDALContourGenerate and
GDALRasterizeLayers), not directly with my job, of course.

I apologize for that. I feel really stupid just now, I see the error
perfectly. I'm going to correct the document just now. And, by the way, I'm
going to add an "Acknowledgements" section.

Many thanks for your help, and sorry again for this stupid mistake

Best Regards
Jorge

On Wed, Jun 17, 2009 at 3:41 PM, Pierre Racine
<Pierre.Racine at sbf.ulaval.ca>wrote:

> Hi Jorge,
>
> At first sight there seems to be a confusion between "raster/vector
> integration in PostGIS" VS "raster/vector integration in GDAL".
>
> When you say "And these new type of GDAL data will be used to perform
> seamless operations with VECTOR DATA (Geometry type, in OGR-Syntax), from
> OGR library." and "This new abstract Raster objects will be used together
> with the OGR Geometry objects in functions like ST_Intersection or ST_Union.
> " you are mixing what we intend to do in PostGIS and something that does not
> really exist in GDAL/OGR (except for the GDALPolygonize, GDALContourGenerate
> and GDALRasterizeLayers methods). Your goal, it seems to me, should not be
> to care about raster/vector operations in GDAL but just to be able to read
> WKT Rasters from PostGIS so that GDAL can do whatever is can do with raster.
> Implementing raster/vector seemless operations over GDAL/OGR is a very
> interesting and desirable project, but I don't think it is part of this
> driver project. You should not have to care about OGR at all.
>
> Pierre
>
>
> From: postgis-devel-bounces at postgis.refractions.net [mailto:
> postgis-devel-bounces at postgis.refractions.net] On Behalf Of Jorge Arévalo
> Sent: 16 juin 2009 00:11
> To: soc at lists.osgeo.org; gdal-dev at lists.osgeo.org; PostGIS Development
> Discussion
> Subject: [postgis-devel] GDAL WKT Raster Driver weekly report #3
>
> Here is the report #3
>
> http://www.gis4free.org/blog/2009/06/16/gsoc-09-weekly-report-3-0506-1206/
>
> And, as usual, the project can be followed here
>
> http://trac.osgeo.org/gdal/wiki/WKTRasterDriver
>
> Best regards
> Jorge
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-devel
>
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