[sr.org] Wikipedia formulaes

Mon Aug 29 15:15:42 PDT 2016

This is my first review of wikipedia. This mailing list may act as a
notepad for my quest !

This page :
https://en.wikipedia.org/wiki/List_of_map_projections
list a common list of projections.
It seems not have them all, maybe some rejects occurs (it happens sometimes
on wikipedia when contents are not widely known).

Those who are present are well defined, and got formulae.
But, it seems to never have a reverse formulae.
That's a good thing to do.

Also, it seems not to have any variant. May be those who write it are not
specialist like these I usually talk with on proj4php ( Note to proj4php
community : keep working like that !).

The next step will be to introduce reverse formulae on wikipedia. We will
see on LCC what they are thinking of !

Regards,
Julien.

2016-08-29 23:18 GMT+02:00 Julien Moquet <moquet.julien at gmail.com>:

> Hi there,
>
> As I said earlier on the osgeo discuss list, I am trying to improve
> spatial reference doing 2 things :
> 1. keep watching wikipedia mathematical formulae from proj4 reference and
> reverse ;
> 2. make a github spatial reference repository ;
>
> Both are costless, easy to maintain, easy to stop.
> I guess the first one is a common way to help, and many others do so, from
> many others spatial communities (tell me !).
>
> For the second one, there is about 45 repository whose name include "epsg"
> and 33 with spatial reference.
> I am not trying to make an other repository, if there is one working
> already !
>
> Let's check wikipedia about common projections, and github for a viable
> repository.
>
> Regards,
> Julien2512.
>
>
> 2016-08-29 23:03 GMT+02:00 Julien Moquet <moquet.julien at gmail.com>:
>
>> 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.
>>
>> Julien2512,
>>
>> 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,
>>>
>>> Manfred
>>>
>>> -----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.
>>>
>>> Regards,
>>>
>>> Luís
>>>
>>>
>>>
>>>
>>>
>>> -------- 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
>>>
>>> Hello,
>>>
>>> At FOSS4G 2016 in Bonn i talked with Venkatesh Raghavan about my poster
>>> presentation "SHAPEFILE PROJECTIONFINDER". URL to poster:
>>> http://www.egger-gis.at/app/download/13175253496/POSTER_EGGE
>>> R_FOSS4G.pdf?t=1469787116
>>>
>>> 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:
>>>
>>> http://www.egger-gis.at/shapefile-projectionfinder/
>>>
>>> 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
>>> Austria
>>>
>>> Web: http://egger-gis.at
>>>
>>> _______________________________________________
>>> Discuss mailing list
>>> Discuss at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/discuss
>>>
>>> _______________________________________________
>>> Discuss mailing list
>>> Discuss at lists.osgeo.org
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>>>
>>
>>
>
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