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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>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?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Pierre<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
postgis-devel-bounces@postgis.refractions.net
[mailto:postgis-devel-bounces@postgis.refractions.net] <b>On Behalf Of </b>David
Zwarg<br>
<b>Sent:</b> 3 février 2010 10:30<br>
<b>To:</b> PostGIS Development Discussion<br>
<b>Subject:</b> Re: [postgis-devel] Feb. Code Sprint and WKTRaster?<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Hi Pierre,<br>
<br>
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.<br>
<br>
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?<br>
<br>
Thanks,<br>
Zwarg<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Feb 3, 2010 at 10:15 AM, Pierre Racine <<a
href="mailto:Pierre.Racine@sbf.ulaval.ca">Pierre.Racine@sbf.ulaval.ca</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>David,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>If we get a satisfying implementation,
we could release it before WKT Raster 0.3.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Pierre</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:postgis-devel-bounces@postgis.refractions.net" target="_blank">postgis-devel-bounces@postgis.refractions.net</a>
[mailto:<a href="mailto:postgis-devel-bounces@postgis.refractions.net"
target="_blank">postgis-devel-bounces@postgis.refractions.net</a>] <b>On Behalf
Of </b>Pierre Racine<br>
<b>Sent:</b> 1 février 2010 09:29<br>
<b>To:</b> PostGIS Development Discussion<br>
<b>Subject:</b> Re: [postgis-devel] Feb. Code Sprint and WKTRaster?</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Hi David,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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: <a
href="http://2010.foss4g.org/" target="_blank">http://2010.foss4g.org/</a></span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>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.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>The planning page is not really up to
date now. I have to work on it.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'>Pierre</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a
href="mailto:postgis-devel-bounces@postgis.refractions.net" target="_blank">postgis-devel-bounces@postgis.refractions.net</a>
[mailto:<a href="mailto:postgis-devel-bounces@postgis.refractions.net"
target="_blank">postgis-devel-bounces@postgis.refractions.net</a>] <b>On Behalf
Of </b>David Zwarg<br>
<b>Sent:</b> 18 janvier 2010 22:01<br>
<b>To:</b> <a href="mailto:postgis-devel@postgis.refractions.net"
target="_blank">postgis-devel@postgis.refractions.net</a><br>
<b>Subject:</b> [postgis-devel] Feb. Code Sprint and WKTRaster?</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Greetings,<br>
<br>
I will be participating in the OSGeo code sprint in February, and I would
really like to help with the WKTRaster project in PostGIS.<br>
<br>
Where should I start to get up to speed with this project? Will any other
WKTRaster developers be at the code sprint?<br>
<br>
Thanks,<br>
David Zwarg<o:p></o:p></p>
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