[postgis-devel] Feb. Code Sprint and WKTRaster?

[Pierre Racine]

We can discuss here but the spec page is definitely a better support for working and final specifications. Once we agree on working spec we move them to the final spec page and this becomes a kind of contract the developer agree to implement. I think the only thing you need to be able to edit the wiki is a osgeo.org user name. Can someone confirm that?

Pierre

From: postgis-devel-bounces at postgis.refractions.net [mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of David Zwarg
Sent: 3 février 2010 10:30
To: PostGIS Development Discussion
Subject: Re: [postgis-devel] Feb. Code Sprint and WKTRaster?

Hi Pierre,

ST_MapAlgebra is right down my alley!  It will be challenging to write the parser, but I am already familiar with the MapAlgebra operations, and I think that'll give me a good head start.

I will think about the specifications, and bounce them off you guys.  Should I document the process on the wiki, or is this list the best place for that?

Thanks,
Zwarg
On Wed, Feb 3, 2010 at 10:15 AM, Pierre Racine <Pierre.Racine at sbf.ulaval.ca<mailto:Pierre.Racine at sbf.ulaval.ca>> wrote:
David,

You could also give a look at "ST_MapAlgebra(raster|geometry, [raster|geometry,...], 'mathematical expression', 'raster' |'geometry') -> raster/geometry" which is a part of Objective B03c in the planning.

This is a very interesting and complex function common to every serious raster GIS package. This is function is very independent from any other development and so can be work on in a isolated way. We must first write the specifications, agree on them and implement it. It implies writing an expression parser which is not an easy task. Basically the function returns a raster with values being the result of a mathematical expression applied on the values of one, two or many overlayed input rasters. We must then be very imaginative and see how we can apply the same behavior using one, two or many geometry. We could discuss that later.

If we get a satisfying implementation, we could release it before WKT Raster 0.3.

Pierre

From: postgis-devel-bounces at postgis.refractions.net<mailto:postgis-devel-bounces at postgis.refractions.net> [mailto:postgis-devel-bounces at postgis.refractions.net<mailto:postgis-devel-bounces at postgis.refractions.net>] On Behalf Of Pierre Racine
Sent: 1 février 2010 09:29
To: PostGIS Development Discussion
Subject: Re: [postgis-devel] Feb. Code Sprint and WKTRaster?

Hi David,

Unfortunalety there will be no representant of the WKT Raster team in New York at the end of february. We all save our money to meet at the next FOSS4G in Barcelona next fall: http://2010.foss4g.org/

In terms of development, what would be very usefull now, would be to build further regression tests for WKT Raster. I'm not a specialist of regression test but there are some example in the \test\regress folder and Mateusz could certainly help you.

You could also  work on objective B03a - Being able to set all the properties of a raster. This implies writing the specification and implementing the code.

The planning page is not really up to date now. I have to work on it.

Pierre

From: postgis-devel-bounces at postgis.refractions.net<mailto:postgis-devel-bounces at postgis.refractions.net> [mailto:postgis-devel-bounces at postgis.refractions.net<mailto:postgis-devel-bounces at postgis.refractions.net>] On Behalf Of David Zwarg
Sent: 18 janvier 2010 22:01
To: postgis-devel at postgis.refractions.net<mailto:postgis-devel at postgis.refractions.net>
Subject: [postgis-devel] Feb. Code Sprint and WKTRaster?

Greetings,

I will be participating in the OSGeo code sprint in February, and I would really like to help with the WKTRaster project in PostGIS.

Where should I start to get up to speed with this project?  Will any other WKTRaster developers be at the code sprint?

Thanks,
David Zwarg

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