Yes, the main issue we found was the performance of display. So something inside the driver is slowing the reading process done by qgis. <br>I took a look at the MODE option. It can be set in the user interface on my plugin. I think that a combobox storing "Read whole table" "Read one row" and "Read entire database" should pass the right options. Is it the real interpretation of this parameter? Any sugestions?<br>
Best regards, <br>Mauricio de Paulo<br><br><br><div class="gmail_quote">2010/11/30 Jorge Arévalo <span dir="ltr"><<a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
2010/11/30 Maurício de Paulo <<a href="mailto:mauricio.dev@gmail.com">mauricio.dev@gmail.com</a>>:<br>
<div class="im">> I've been using GDAL 1.7 and postgis 1.5.1<br>
> Both postgis' windows and ubuntu versions are able to load the rasters fine.<br>
> We've encountered some trouble with what we believe is the "regular<br>
> blocking" issue.<br>
> wktraster's QGIS plugin and MapServer source were tested on ubuntu 10.04<br>
> with ubuntugis binaries.<br>
> Perfomance looks like a huge issue at the moment. I didn't investigate why.<br>
> I can probably take look back at this issue when I get back home to my<br>
> ubuntu box. I can't test on windows because there is no QGIS compiled with<br>
> gdal 1.7 for windows prebuilt.<br>
> This new gdal driver version was included in which gdal release? Maybe we<br>
> can recompile everything and test again.<br>
> Best regards,<br>
> Mauricio<br>
><br>
<br>
</div>Yes, the old version of the driver had some known (by me) problems:<br>
<br>
- Depends on the information stored in "raster_columns" table, in<br>
PostGIS installation, and it shouldn't.<br>
- Performance. I need to review this. It's a question of PostGIS queries.<br>
<br>
In October, I commited a new version with some improvements. It's in<br>
GDAL trunk since release 20912<br>
(<a href="http://trac.osgeo.org/gdal/changeset/20912" target="_blank">http://trac.osgeo.org/gdal/changeset/20912</a>). Anyway, I'd like to<br>
improve more things in this driver. The reading process is the big<br>
issue right now. The best way to read blocks of data.<br>
<br>
If you use it, the most important thing is now you need to specify an<br>
extra parameter: "mode". Further information here:<br>
<a href="http://trac.osgeo.org/gdal/wiki/frmts_wtkraster.html" target="_blank">http://trac.osgeo.org/gdal/wiki/frmts_wtkraster.html</a><br>
<div><div></div><div class="h5"><br>
Best regards,<br>
--<br>
Jorge Arévalo<br>
Internet & Mobilty Division, DEIMOS<br>
<a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a><br>
<a href="http://mobility.grupodeimos.com/" target="_blank">http://mobility.grupodeimos.com/</a><br>
<a href="http://gis4free.wordpress.com" target="_blank">http://gis4free.wordpress.com</a><br>
<br>
> 2010/11/29 Jorge Arévalo <<a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a>><br>
>><br>
>> Good news! Which version of GDAL/PostGIS are you using? I commited a<br>
>> new version of the GDAL driver on October, and included WKT Raster as<br>
>> official part of PostGIS on September 26th.<br>
>><br>
>> On Mon, Nov 29, 2010 at 9:40 PM, Maurício de Paulo<br>
>> <<a href="mailto:mauricio.dev@gmail.com">mauricio.dev@gmail.com</a>> wrote:<br>
>> > Ok, after a few minutes of implementation here it is. Now the plugin<br>
>> > lists<br>
>> > the tables from the database and shows some of it's metadata. Now I<br>
>> > think<br>
>> > it's fully functional. If anyone finds a bug , please tell me.<br>
>> > Best regards,<br>
>> ><br>
>> > On Mon, Nov 29, 2010 at 3:50 PM, Maurício de Paulo<br>
>> > <<a href="mailto:mauricio.dev@gmail.com">mauricio.dev@gmail.com</a>><br>
>> > wrote:<br>
>> >><br>
>> >> Hi Jorge,<br>
>> >> Good news. The plugin wktraster is exactly a tool to connect qgis to<br>
>> >> postgis rasters through GDAL and visualize the data.<br>
>> >> Stefan asked about the processing. This is something the plugin doesn't<br>
>> >> do.<br>
>> >> I've tested with a friend both qgis (with the plugin) and mapserver<br>
>> >> loading postgis rasters. Both worked fine, and the only requirement is<br>
>> >> qgis<br>
>> >> compiled against gdal 1.7.<br>
>> >> I'm interested in updating the plugin this week to work as I've<br>
>> >> planned.<br>
>> >> It's going to speak for itself.<br>
>> >> Best Regards,<br>
>> >> Mauricio<br>
>> >> Ps.: Anyone willing to help and join this effort is always welcome.<br>
>> >><br>
>> >> On Mon, Nov 29, 2010 at 3:45 PM, Jorge Arévalo<br>
>> >> <<a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a>> wrote:<br>
>> >>><br>
>> >>> Hi,<br>
>> >>><br>
>> >>> If you want a GDAL version compiled with PostGIS Raster support on<br>
>> >>> Windows, you may take a look here: <a href="http://vbkto.dyndns.org:1280/sdk/" target="_blank">http://vbkto.dyndns.org:1280/sdk/</a><br>
>> >>><br>
>> >>> Visualizing PostGIS Raster data via GDAL driver is one of my TODO<br>
>> >>> tasks. I don't have too much free time now, but if you're interested<br>
>> >>> on this topic, and you're going to test it, please let me know. There<br>
>> >>> are more people interested on that, and I'm providing support to some<br>
>> >>> of them (not as much support as I'd like, because the time...)<br>
>> >>><br>
>> >>> Best regards,<br>
>> >>><br>
>> >>> --<br>
>> >>> Jorge Arévalo<br>
>> >>> Internet & Mobilty Division, DEIMOS<br>
>> >>> <a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a><br>
>> >>> <a href="http://mobility.grupodeimos.com/" target="_blank">http://mobility.grupodeimos.com/</a><br>
>> >>> <a href="http://gis4free.wordpress.com" target="_blank">http://gis4free.wordpress.com</a><br>
>> >>><br>
>> >>> 2010/11/29 Stefan Keller <<a href="mailto:sfkeller@gmail.com">sfkeller@gmail.com</a>>:<br>
>> >>> > Ok (I'm cross posting to qgis-developer and postgis-users).<br>
>> >>> ><br>
>> >>> > I'm still not sure if I did express myself clearly:<br>
>> >>> > You say, that under Windows, there's no QGIS compiled against GDAL<br>
>> >>> > 1.7/1.8 with PostGIS Raster support?<br>
>> >>> ><br>
>> >>> > What I finally dream of, is using QGIS to display the results of a<br>
>> >>> > SQL<br>
>> >>> > query (either as raster or vector) against at least one raster<br>
>> >>> > layer.<br>
>> >>> > This query contains raster constructors (like ST_Intersection) and<br>
>> >>> > operations (like ST_Reclass; see<br>
>> >>> > <a href="http://trac.osgeo.org/postgis/wiki/WKTRaster" target="_blank">http://trac.osgeo.org/postgis/wiki/WKTRaster</a>).<br>
>> >>> ><br>
>> >>> > Any suggestions?<br>
>> >>> > -S.<br>
>> >>> ><br>
>> >>> ><br>
>> >>> > 2010/11/29 Maurício de Paulo <...@<a href="http://gmail.com" target="_blank">gmail.com</a>>:<br>
>> >>> >> Hi Stefan,<br>
>> >>> >><br>
>> >>> >> WKTRaster Plugin just repasses the right information to the GDAL<br>
>> >>> >> driver.<br>
>> >>> >> It's not a new qgis driver.<br>
>> >>> >> I'm planning on implementing the table listing using pyqt this<br>
>> >>> >> week. I<br>
>> >>> >> was a<br>
>> >>> >> little delayed by my master's application.<br>
>> >>> >><br>
>> >>> >> The idea in the plugin is simply find the QGIS's conections<br>
>> >>> >> available,<br>
>> >>> >> list<br>
>> >>> >> the raster tables inside postgis and pass the right arguments to<br>
>> >>> >> the<br>
>> >>> >> gdal<br>
>> >>> >> driver.<br>
>> >>> >><br>
>> >>> >> At the moment I haven't found any gdal 1.7 windows build with QGIS.<br>
>> >>> >> GDAL 1.7<br>
>> >>> >> introduces wktraster. The driver conects to postgis raster and read<br>
>> >>> >> it<br>
>> >>> >> as a<br>
>> >>> >> binary. It's still VERY unstable and gdal version 1.8 seems to be<br>
>> >>> >> greatly<br>
>> >>> >> improved.<br>
>> >>> >> So what a windows user need to get the plugin to work is a (still<br>
>> >>> >> not<br>
>> >>> >> found)<br>
>> >>> >> qgis compiled against gdal 1.7.<br>
>> >>> >> You can compile your's from source if needed.<br>
>> >>> >><br>
>> >>> >> So, as far as qgis to wktraster, with the plugin qgis reads the<br>
>> >>> >> wktraster as<br>
>> >>> >> a regular raster. Just for show. If you did some kind of processing<br>
>> >>> >> and<br>
>> >>> >> populated a new raster table, qgis is going to read that result<br>
>> >>> >> too.<br>
>> >>> >> The<br>
>> >>> >> plugin is not intended (at the moment at least) to raster<br>
>> >>> >> processing<br>
>> >>> >> inside<br>
>> >>> >> postgis. It just loads the table to the screen.<br>
>> >>> >><br>
>> >>> >> In the future, with a more stable wktraster probably someone (or<br>
>> >>> >> me)<br>
>> >>> >> is<br>
>> >>> >> going to write a set of wktraster's tools as a plugin, but for the<br>
>> >>> >> moment it<br>
>> >>> >> should be run as sql. I advise postgis manager's to the task.<br>
>> >>> >><br>
>> >>> >> Best regards,<br>
>> >>> >><br>
>> >>> >><br>
>> >>> >> 2010/11/29 Stefan Keller <...@<a href="http://gmail.com" target="_blank">gmail.com</a>><br>
>> >>> >>><br>
>> >>> >>> Hi,<br>
>> >>> >>><br>
>> >>> >>> There are new versions around of "PostGIS Raster"<br>
>> >>> >>> (renamed from formerly known "PostGIS WKT Raster").<br>
>> >>> >>><br>
>> >>> >>> What's the status of your "WKTRaster Plugin 0.1"?<br>
>> >>> >>> I assume it's rendering the raster values (e.g. from ST_AsBinary)<br>
>> >>> >>> -<br>
>> >>> >>> not the polygons/geomvals (from ST_DumpAsPolygons), right?<br>
>> >>> >>> Is there a chance to get it running on Windows too?<br>
>> >>> >>> Are there other plugins?<br>
>> >>> >>><br>
>> >>> >>> Yours, S.<br>
>> >>> > _______________________________________________<br>
>> >>> > postgis-users mailing list<br>
>> >>> > <a href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a><br>
>> >>> > <a href="http://postgis.refractions.net/mailman/listinfo/postgis-users" target="_blank">http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br>
>> >>> ><br>
>> >><br>
>> >><br>
>> >><br>
>> >> --<br>
>> >> Mauricio de Paulo<br>
>> >> Engenheiro Cartografo<br>
>> >><br>
>> ><br>
>> ><br>
>> ><br>
>> > --<br>
>> > Mauricio de Paulo<br>
>> > Engenheiro Cartografo<br>
>> ><br>
>> ><br>
>><br>
>><br>
>><br>
>> --<br>
>> Jorge Arévalo<br>
>> Internet & Mobilty Division, DEIMOS<br>
>> <a href="mailto:jorge.arevalo@deimos-space.com">jorge.arevalo@deimos-space.com</a><br>
>> <a href="http://mobility.grupodeimos.com/" target="_blank">http://mobility.grupodeimos.com/</a><br>
>> <a href="http://gis4free.wordpress.com" target="_blank">http://gis4free.wordpress.com</a><br>
><br>
><br>
><br>
> --<br>
> Mauricio de Paulo<br>
> Engenheiro Cartografo<br>
><br>
><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br>Mauricio de Paulo<br>Engenheiro Cartografo<br><br>