[postgis-users] raster2pgsql vs gdal2wktraster ...can someone clarify?

[AJ7]

Hi Pierre,
Thanks for this.

So would you advise me to get postgis from the trunk, and compile the
source, or its fine to work with the version from kyngchaos for now?

In terms of the image - well the image pixels all have a certain value
associated to them (its a probability map actually, so all the values per
pixel are between 0->1. I want to intersect a polygon (region) with this
image raster and pull out the mean probability depending on which pixels
were covered. The image is 3.5mb

If I don't import -k 1x1, then what is the best way to proceed? That's how
the image has been produced for me to work with - there is only 1 image.
 

Pierre Racine-2 wrote:
> 
> The version you got from kyngchaos is stating to be a bit old. Since this
> time WKT Raster was integrated into PostGIS and gdal2wktraster.py was
> renamed raster2pgsql.py.
> 
> Considering the version you have gdal2wktraster.py is the right script to
> import raster in PostGIS.
> 
> You should not use -k 1x1 to import your raster. This would produce one
> row per pixel. Normally you want to tile your raster coverage to a certain
> tile size if it is big enough.
> 
> What is the size of your image? How many images do you have? What kind of
> operations do you want to do with it in the database? This will dictate if
> you should use the -k option and which tile size to use.
> 
> Pierre
> 
>>-----Original Message-----
>>From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-
>>bounces at postgis.refractions.net] On Behalf Of AJ7
>>Sent: 14 mars 2011 11:05
>>To: postgis-users at postgis.refractions.net
>>Subject: [postgis-users] raster2pgsql vs gdal2wktraster ...can someone
clarify?
>>
>>
>>Hi
>>Can someone please clarify as to which script should be used to convert a
>>raster tif to a postgis raster table?
>>
>>I have only got the gdal2wktraster script (I am on snow leopard, with
>>postgres 9).
>>
>>Also, if I have got a raster image with each pixel representing a value,
>>what is the command to export this to a postgis raster table? would this
>>work (emphasis on the 1x1)?
>>-> gdal2wktraster.py -r yourimage.tif -t [data_table]  -s 4326 -k 1x1 -I
>>script.sql
>>
>>thanks
>>--
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>>clarify--tp31145027p31145027.html
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>>
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