<div dir="ltr"><div><div>Thank you Even,<br><br></div>It's true I was just about to contribute to <a href="http://proj4.org/projections/index.html" rel="noreferrer" target="_blank">http://proj4.org/projections/<wbr>index.html</a> !<br></div><br><div><div><div><br>"Is it about having a catalog of spatial reference systems (and all related<br>
information: projections, projection parameters, ellipsoids, datums, prime<br>
meridians, area of use, transformations, etc...) "<br><br></div><div>Yes. And it's true that many other projects made a catalog on their own.<br></div><div>But all of them need a human being to get hacked.<br></div><div><br><br></div><div>We will get back on metacrs or spatialreference mailing list.<br></div><div>But it was needed to act the project need to be, on a wider part of the community.<br></div><div><br><br></div><div>Regards,<br></div><div>Julien.<br></div><div><br><br><a href="http://proj4.org/projections/index.html" rel="noreferrer" target="_blank"></a></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-09-02 9:50 GMT+02:00 Even Rouault <span dir="ltr"><<a href="mailto:even.rouault@spatialys.com" target="_blank">even.rouault@spatialys.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Foks,<br>
<br>
I read through the emails of this thread and I'm still not sure to understand<br>
what the exact focus would be. It seems it might go beyond the title of this<br>
email thread.<br>
<br>
Is it about documentation about projections ? If so, I guess improving proj.4<br>
documentation could be appreciated. There has been a new commit just last<br>
night ( <a href="http://lists.maptools.org/pipermail/proj/2016-September/007480.html" rel="noreferrer" target="_blank">http://lists.maptools.org/<wbr>pipermail/proj/2016-September/<wbr>007480.html</a> )<br>
to add the chart of each projection :<br>
<a href="http://proj4.org/projections/index.html" rel="noreferrer" target="_blank">http://proj4.org/projections/<wbr>index.html</a> . There are only images extracted from<br>
<a href="ftp://ftp.remotesensing.org/proj/OF90-284.pdf" rel="noreferrer" target="_blank">ftp://ftp.remotesensing.org/<wbr>proj/OF90-284.pdf</a> for now but that would be great<br>
to extend them with formulas, etc...<br>
<br>
Is it about having a catalog of spatial reference systems (and all related<br>
information: projections, projection parameters, ellipsoids, datums, prime<br>
meridians, area of use, transformations, etc...) ? Then there are different<br>
projects already tackling that. For example GDAL starts with the EPSG catalog<br>
+ some algorithms to detect one of the many datum shifts to WGS84 (this part<br>
is controversial and could/should be improved), and that is the source from<br>
which the proj.4 'espg' catalog (the whole process is documented at<br>
<a href="https://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README" rel="noreferrer" target="_blank">https://svn.osgeo.org/metacrs/<wbr>geotiff/trunk/libgeotiff/csv/<wbr>README</a>). This process<br>
is a bit cumbersome and we had some discussions last year about perhaps<br>
adopting a SQLite3 database instead (see thread starting at<br>
<a href="https://lists.osgeo.org/pipermail/metacrs/2015-August/000846.html" rel="noreferrer" target="_blank">https://lists.osgeo.org/<wbr>pipermail/metacrs/2015-August/<wbr>000846.html</a>) : this<br>
hasn't made progress yet.<br>
GDAL has also a few extra catalogs from (somewhat old) ESRI definitions, and<br>
other vendors. There are also catalogs for SRS of other planets :<br>
<a href="https://trac.osgeo.org/gdal/ticket/6623" rel="noreferrer" target="_blank">https://trac.osgeo.org/gdal/<wbr>ticket/6623</a> (interestingly Peter Baumann<br>
mentionned that the EPSG service might host this catalog in the future)<br>
A tricky part about all this catalogs is the intellectual property behind as<br>
there are often not completely "free" in the meaning we generally give to that<br>
term for software (redistribution is OK, but most often modifying definitions<br>
is not allowed). But beyond that, as raised by Carl Reed, adding new spatial<br>
reference system definitions, or editing existing ones, is something that needs<br>
some form of validation at some point (unless you decide that anyone can<br>
modify anything, but that opens the door to voluntary or unvoluntary mess). It<br>
is similar to when someone submits a patch/pull request for code: someone<br>
needs to make a decision if it is appropriate or not.<br>
<br>
You've also identified <a href="http://spatialreference.org" rel="noreferrer" target="_blank">spatialreference.org</a> (now somewhat abandonned due to<br>
lack of volunteer) or <a href="http://epsg.io" rel="noreferrer" target="_blank">epsg.io</a> as online catalogs. I see also<br>
<a href="https://github.com/ebrelsford/projestions#api" rel="noreferrer" target="_blank">https://github.com/ebrelsford/<wbr>projestions#api</a> that has been mentionned.<br>
Perhaps one or several of them of those could be used as the base to build<br>
something new above ?<br>
<br>
Probably that the MetaCRS list could be a more appropriate and focused place<br>
to hold such further discussions ?<br>
<a href="https://lists.osgeo.org/mailman/listinfo/metacrs" rel="noreferrer" target="_blank">https://lists.osgeo.org/<wbr>mailman/listinfo/metacrs</a><br>
<br>
Unrelated: I read a few confusions in this thread with "OSGeo members" vs<br>
"OSGeo charter members". Quickly summarizing <a href="http://www.osgeo.org/membership" rel="noreferrer" target="_blank">http://www.osgeo.org/<wbr>membership</a>:<br>
anyone can declare himself as a OSGeo member by registering himself on<br>
<a href="https://wiki.osgeo.org/wiki/Special:RequestAccount" rel="noreferrer" target="_blank">https://wiki.osgeo.org/wiki/<wbr>Special:RequestAccount</a> . OSGeo charter members are<br>
members who are elected, for the only additional purpose of electing the OSGeo<br>
boards. There are also OSGeo participants who are anyone that takes part to<br>
OSGeo related activities. Projects are generally open to contributions from<br>
anyone, with some kernel/PSC (not necessarily made of charter members) taking<br>
the main decisions.<br>
<br>
Best regards,<br>
<br>
Even<br>
<div class="HOEnZb"><div class="h5"><br>
> Hello,<br>
><br>
> At FOSS4G 2016 in Bonn i talked with Venkatesh Raghavan about my poster<br>
> presentation "SHAPEFILE PROJECTIONFINDER". URL to poster:<br>
> <a href="http://www.egger-gis.at/app/download/13175253496/POSTER_EGGER_FOSS4G.pdf?t" rel="noreferrer" target="_blank">http://www.egger-gis.at/app/<wbr>download/13175253496/POSTER_<wbr>EGGER_FOSS4G.pdf?t</a><br>
> =1469787116<br>
><br>
> He recommended to start a discussion in this mailing list about the topic<br>
> mentioned in the mail subject.<br>
><br>
> I also talked in Bonn with Petr Pridal about <a href="http://epsg.io" rel="noreferrer" target="_blank">http://epsg.io</a>. Some days<br>
> before Bonn i wrote emails to Aaaron Racicot and the mailing list of<br>
> <a href="http://spatialrefrence.org" rel="noreferrer" target="_blank">http://spatialrefrence.org</a>.<br>
><br>
> Please read first carefully on my website, what i plan to do:<br>
><br>
> <a href="http://www.egger-gis.at/shapefile-projectionfinder/" rel="noreferrer" target="_blank">http://www.egger-gis.at/<wbr>shapefile-projectionfinder/</a><br>
><br>
> There are two problems to solve before tools like SHAPEFILE<br>
> PROJECTIONFINDER can be developed as a sustainable solution:<br>
><br>
> 1. Until today there is no stable free service running like<br>
> <a href="http://www.projfinder.com" rel="noreferrer" target="_blank">www.projfinder.com</a> by Aaron Racicot, which can be used by all developers.<br>
><br>
> 2. Until today there is no open source database which includes all<br>
> coordinate system with epsg-code and additionally user and esri definded<br>
> grids.<br>
><br>
> There are open source solutions like:<br>
><br>
> - <a href="http://spatialrefrence.org" rel="noreferrer" target="_blank">spatialrefrence.org</a><br>
> - <a href="http://epsg.io" rel="noreferrer" target="_blank">epsg.io</a><br>
><br>
> But in the detail both solutions have problems to update their database<br>
> with low costs.<br>
><br>
> Maybe OSGeo can promote a stable service with load balancing on the base of<br>
> an existing solution like <a href="http://epsg.io" rel="noreferrer" target="_blank">epsg.io</a> including Aarons idea?<br>
><br>
> Maybe organisation like UN, a university or EU (INTERREG) are possible<br>
> project partners/sponsors for such a solution?<br>
><br>
> The goal is: Tools like SHAPEFILE PROJECTIONFINDER, a Q-GIS-Plugin or a<br>
> mobile application can use a stable free gis-service updated daily and<br>
> help gis users to solve projection troubles faster. I think gis users<br>
> working not everyday with gis will be happy about this solutions?<br>
><br>
> What do you think about my idea?<br>
><br>
> Best regards,<br>
><br>
> Manfred Egger<br>
><br>
> Alois-Schrott-Str. 34<br>
> 6020 Innsbruck<br>
> Austria<br>
><br>
> Web: <a href="http://egger-gis.at" rel="noreferrer" target="_blank">http://egger-gis.at</a><br>
><br>
> ______________________________<wbr>_________________<br>
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> <a href="http://lists.osgeo.org/mailman/listinfo/discuss" rel="noreferrer" target="_blank">http://lists.osgeo.org/<wbr>mailman/listinfo/discuss</a><br>
<br>
</div></div><span class="HOEnZb"><font color="#888888">--<br>
Spatialys - Geospatial professional services<br>
<a href="http://www.spatialys.com" rel="noreferrer" target="_blank">http://www.spatialys.com</a><br>
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