Re: QGIS Loads Black Screen For PostGIS Out-Db Raster Data

[Osahon Oduware <osahon.gis@xxxxxxxxx>]

I forgot to mention that I have put the question on the qgis-user mailing list. Thanks for your help.

On Tue, Apr 18, 2017 at 3:31 PM, Osahon Oduware <osahon.gis@xxxxxxxxx> wrote:

Hi Adrian,

I think it is a problem with QGIS as things seems fine from the PostGIS end (raster data) going by the following queries:

SELECT r_table_name, r_raster_column, out_db FROM raster_columns;

returned the following output:

"test_rast","rast","[True, True, True]"

SELECT t.rid, (md).isoutdb, (md).path

FROM test_rast AS t, ST_BandMetaData(t.rast) AS md

limit 1;

returned the following output:

1,True,"/home/nagispg/local/src/SID_Test/rast_1.sid"

SELECT ST_Width(rast) wdth, ST_Height(rast) hgt

FROM test_rast;

returned the following output:

10000,7000

The "Add to canvas" menu is a pop-up that is displayed when you right-click on the raster table from the DB Manager Menu (Database => DB Manager => DB Manager)

On Tue, Apr 18, 2017 at 3:03 PM, Adrian Klaver <adrian.klaver@xxxxxxxxxxx> wrote:

On 04/18/2017 06:41 AM, Osahon Oduware wrote:

Hi All,

I have an out-db raster on PostGIS which I tried to load in QGIS (v
2.14.12-Essen) utilizing the DB Manager to establish a connection. I
could view the raster table, but when I try to "Add to canvas" it
displays a black screen instead of the raster image.

There is data in the table?

I am not that familiar with GIS, much less QGIS. Still a quick look at the docs found this:

http://docs.qgis.org/2.14/en/docs/user_manual/working_with_raster/supported_data.html#what-is-raster-data

I see Add Raster layer, nothing about Add to canvas.

If the above does not answer the question I would say you will have a better chance of getting an answer here:

http://lists.osgeo.org/mailman/listinfo/qgis-user

I would be glad if someone could help me to resolve this.

--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx