[Qgis-developer] raster analysis and filtering status?

[Peter Ersts]

Sorry for the overly slow response. Tim is correct, we have talked about 
adding some of this functionality the core classes but it does not fit 
currently in the raster frame work, which still needs to be rethought 
for version 2.x.

As many filtering, reprojecting, clipping, raster arithmetic etc 
procedures change or create new data, it is best to create new layers 
for the output. So having this broader functionality in an analysis 
library make a lot of sense, especially since many routines will be 
working on multiple layers. Nonetheless, there will be opportunities to 
add some functionality, maybe accessors to blocks of data for example, 
to the existing raster class.

So what is really needed is a road map of desired manipulations and 
their inputs. Then we start to see what is needed and where it would be 
best implemented. That and about 20 more hours in a day.

-pete

Tim Sutton wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi
>
> G. Allegri wrote:
>   
>> Thanks strk. Yes I knew it, but I was asking about QGis in particular.
>> Thanks anyway.
>>
>> giovanni
>>
>> 2009/3/30 strk <strk at keybit.net>:
>>     
>>> On Mon, Mar 30, 2009 at 09:35:39AM +0200, G. Allegri wrote:
>>>       
>>>> Just to know, is there ongoing work for raster analysis/filtering
>>>> features? I'm just trying to dig into C++ and QGis code to be able to
>>>> give a (litlle) hand with it. I know that Peter is particularly
>>>> involved with this. Can you update us with tha actual status?
>>>>         
>
>
> Peter Ersts may correct me if I am wrong, but at present there is no
> work underway on raster analysis in core. During the hackfest we started
> with the creation of a new (third) QGIS library libqgis_analysis.
> Currently mainly Carson is working on porting his python routines to
> this, but it would be great to start wrapping in other raster orientated
> routines.
>
> Someone posted to the mailing list not too long ago that they were
> planning to wrap gdal raster functions such as clip, warp etc. though I
> dont know what state (if any) that work is currently at.
>
> Regards
>
> Tim
>
>
>   
>>> Are you aware of the WKTRaster project [1] ?
>>> It aims at in-db raster analisys (postgis-based).
>>>
>>> [1] http://postgis.refractions.net/support/wiki/index.php?WKTRasterHomePage
>>>
>>> --strk;
>>>
>>>
>>>       


-- 
====================================
Peter J. Ersts, Project Specialist
American Museum of Natural History
Center for Biodiversity and Conservation
Central Park West at 79th Street
New York, New York 10024
Tel: Home Office (518)-632-4745 or NYC Office (212)-496-3488
Web: http://biodiversityinformatics.amnh.org
Web: http://cbc.amnh.org

Quantum GIS Raster Development Team. Visit http://www.qgis.org
to learn more about QGIS, a free and open source desktop GIS

Open Source,
...evolving through community cooperation to change the world bit by bit