[OSGeo-Discuss] Detect and define the coordinate system of gis data with no projection information automatically

Luí­s de Sousa luis.de.sousa at protonmail.ch
Tue Aug 30 02:34:34 PDT 2016

Hi Julien et al.,

My experience with Wikis is mostly negative, however, the GitHub "database" could work very well. The project could be hooked up to ReadTheDocs and folk would just commit their .rst and .md files. Preparatory work would go around defining the templates to submit projections, data and systems.

Who wants to join? I will create a group at GitHub and get this going in the coming days.



-------- Original Message --------
Subject: Re: [OSGeo-Discuss] Detect and define the coordinate system of gis data with no projection information automatically
Local Time: 29 August 2016 11:03 PM
UTC Time: 29 August 2016 21:03
From: moquet.julien at gmail.com
To: manfred at egger-gis.at
luis.de.sousa at protonmail.ch,discuss at lists.osgeo.org

Hi all,

I am agree with manfred and Luis : we can improve spatial reference data a lot !
It is a good idea to extend it to mathematical definitions, but its sounds like a wiki.
I propose to start checking up wikipedia's data over projection references and mathematical models, up to the proj4's communities (I mean using the projection issues from them). It is costless, easy to share and manage, and may be we can get feed back faster than emailing epsg group !
And I guess, lot of people do so !

On the other hand, I learn from proj4php, that a github project could be a good database.
As many of us see things differently, they will fork it their way.

What do you think of ?
I will tell if it is working, on spatialreference mailing list.


2016-08-29 14:45 GMT+02:00 manfred at egger-gis.at <manfred at egger-gis.at>:

Dear Luis,

Which concrete detail is not clear about the projection finder project?

Maybe a look at the testservice of Aaron will help to understand this idea: www.projfinder.com ?

Best regards,


-----Original Message-----
From: "Luí­s de Sousa" <luis.de.sousa at protonmail.ch>
Sent: Sunday, August 28, 2016 2:39pm
To: "manfred at egger-gis.at" <manfred at egger-gis.at>
Cc: discuss at lists.osgeo.org
Subject: Re: [OSGeo-Discuss] Detect and define the coordinate system of gis data with no projection information automatically

Dear Manfred,

The projection finder project is not entirely clear to me, however, the suggestion for a new coordinate system database is indeed pertinent. This was referred in other addresses at the conference: spatialreference.org has not been maintained for several years; parts of proj4 are not, or poorly, maintained.

Besides a reference system database, it would also be quite useful to have a projection data base, including mathematical definitions, map sketches of their ouput and some clues or guidelines to its implementation (e.g. pseudo-code algorithms). This information is today very dispersed in the web.



-------- Original Message --------
Subject: [OSGeo-Discuss] Detect and define the coordinate system of gis data with no projection information automatically
Local Time: August 28, 2016 6:05 PM
UTC Time: August 28, 2016 4:05 PM
From: manfred at egger-gis.at
To: discuss at lists.osgeo.org


At FOSS4G 2016 in Bonn i talked with Venkatesh Raghavan about my poster presentation "SHAPEFILE PROJECTIONFINDER". URL to poster:

He recommended to start a discussion in this mailing list about the topic mentioned in the mail subject.

I also talked in Bonn with Petr Pridal about http://epsg.io. Some days before Bonn i wrote emails to Aaaron Racicot and the mailing list of http://spatialrefrence.org.

Please read first carefully on my website, what i plan to do:


There are two problems to solve before tools like SHAPEFILE PROJECTIONFINDER can be developed as a sustainable solution:

1. Until today there is no stable free service running like www.projfinder.com by Aaron Racicot, which can be used by all developers.

2. Until today there is no open source database which includes all coordinate system with epsg-code and additionally user and esri definded grids.

There are open source solutions like:

- spatialrefrence.org
- epsg.io

But in the detail both solutions have problems to update their database with low costs.

Maybe OSGeo can promote a stable service with load balancing on the base of an existing solution like epsg.io including Aarons idea?

Maybe organisation like UN, a university or EU (INTERREG) are possible project partners/sponsors for such a solution?

The goal is: Tools like SHAPEFILE PROJECTIONFINDER, a Q-GIS-Plugin or a mobile application can use a stable free gis-service updated daily and help gis users to solve projection troubles faster. I think gis users working not everyday with gis will be happy about this solutions?

What do you think about my idea?

Best regards,

Manfred Egger

Alois-Schrott-Str. 34
6020 Innsbruck

Web: http://egger-gis.at

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