[postgis-users] Correct or wrong raster image loading

[Giannis Giakoumidakis]

All right, I got that, thank you. 


So is there anyone who uses QGIS plugin to Postgis and managed to display raster data, because I can't and I don't know what's the problem? Which part of the database I have to Add in order to display my rasters in QGIS platform?






________________________________
 From: Bborie Park <bkpark at ucdavis.edu>
To: postgis-users at postgis.refractions.net 
Sent: Monday, May 14, 2012 10:45 PM
Subject: Re: [postgis-users] Correct or wrong raster image loading
 
Giannis,

If your tile size is the same as the raster size, you're only going to
get one tile (and one row).  Now if you were specify a tile size smaller
than the raster size (such as 30x31), you would have 117 tiles (and rows).

I wouldn't be concerned about not seeing the whole blob in pgAdmin.
pgAdmin usually does that for data that is particularly large.

-bborie

On 05/14/2012 12:07 PM, Giannis Giakoumidakis wrote:
> Thanks for the anwser.
> 
> My raster is 390x279, so I use -t 390x279. I get no errors. I didn't understand from your asnwer, the rows in the table should have been more than 1 that it is now or it is correct like that?
> 
> The .sql I get before I use psql is this, in Notepad++:
> 
> BEGIN;
> CREATE TABLE "public"."cc00h00m15s" ("rid" serial PRIMARY KEY,"rast" raster);
> INSERT INTO "public"."cc00h00m15s" ("rast") VALUES ('0100000400DDC80B44AA83173FF2C80B44AA8317BF1986D9154421394032D1D677B4AE414000000000000000000000000000000000E6100000860117010400828282828282828282828282.......')::raster;
> ANALYZE "public"."cc00h00m15s";
> SELECT AddRasterConstraints('public','cc00h00m15s','rast',TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,FALSE,TRUE,TRUE,TRUE,TRUE,TRUE);
> END;
> 
> I don't know why in the sql editor of pgAdmin, the: VALUES ('0100000400DDC80B44AA83173FF2C80B44AA8317BF1986D9154421394032D1D677B4AE41400....') are missing.
> 
> 
> 
> 
> 
> 
> 
> ________________________________
>  From: Bborie Park <bkpark at ucdavis.edu>
> To: postgis-users at postgis.refractions.net 
> Sent: Monday, May 14, 2012 8:07 PM
> Subject: Re: [postgis-users] Correct or wrong raster image loading
>  
> What are the dimensions (width/height) of your raster?  I just tested
> your raster2pgsql command string...
> 
> raster2pgsql -s 4236 -I -C -M *.tif -F -t 100x100 testtable
> 
> And it has no issues.  The generated table will only have 2 or 3 columns
> (3 since you specified -F).  Each raster column will have one entry in
> the raster_columns view.
> 
> You may wan to check the SQL generated from raster2pgsql instead of
> piping directly to psql.  I'm guessing something went wrong in the
> raster loading process.  Without additional information (error messages,
> if any), we really can't say what is wrong.
> 
> -bborie
> 
> 
> On 05/14/2012 09:01 AM, Giannis Giakoumidakis wrote:
>> I'm not sure if my loading of raster images is correct. 
>>
>> I use "raster2pgsql -s 4236 -I -C -M *.tif -F -t 100x100 public.demelevation | psql -d gisdb" from the manual. What I get is a table that has only 3 columns (rid, rast, filename) and 1 row only (I thought -t would create many rows). Also, 12 constraints. Finally, 1 row in the "raster_columns" view, which contains all the details of the loaded raster. 
>>
>>
>> The difference with a loaded shapefile is that this table has 55.000 rows that contains all the vector data details.
>>
>>
>> So I have a major problem when I connect to the database through QGIS. There I can load and display normally a shapefile from the database (it appeas with "MULTIPOLYGON" type), but all the tables which contains rasters appear with "no geometry" type and can't be displayed in QGIS. 
>>
>>
>> Can anyone tell me where is my fault, in the QGIS or in the first loading of the raster images in the database? Thanks.
>>
>>
>>
>>
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> 
> 
> 
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-- 
Bborie Park
Programmer
Center for Vectorborne Diseases
UC Davis
530-752-8380
bkpark at ucdavis.edu
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