Peter,
Carl,
Thank you for your valuable input to the discussion,
For me it is clear, as Peter suggests that improvements should be build
on top of what exists, and is carefully validated.
Dirk.
On 2016-09-02 01:45, Carl Reed wrote:
Julien -
The EPSG is what the OGC considers normative. This is because there are
humans in the loop that process requests for new a CRS to be added to
the EPSG database. The humans are geodesy experts who validate the
"correctness" or validity of a submitted CRS. After review, most
submitted CRSs are included in the EPSG database and available via
registry interfaces, such as provided by the OGC. Obviously, the process
can take a while as the humans are volunteers.
The primary problem with a totally open CRS registry is validation. In
the 100% situation, anyone can submit and have included a CRS in the
registry. At that point, every entry in the registry becomes suspect as
to its mathematical correctness and geodetic validity. The problem is
exacerbated if anyone can edit existing entries. Then the entire
registry becomes suspect and buyer beware - along with potential
liability/litigation.
So, if there is a decision to move forward within the OSGeo community to
provide a CRS registry, I would suggest also providing a governance
mechanism and/or process to ensure as best as possible the validity of
entries in the registry.
My two cents on this topic!
Regards
Carl Reed
Long time geo guy
On Thu, Sep 1, 2016 at 5:17 PM, Julien Moquet <[email protected]
<mailto:[email protected]>> wrote:
Hi Peter,
How open is the OGC registry ?
If data came from EPSG, it will not be really open : they never
answer the request I sent.
I think it's a human scalability problem (not really maintained).
The idea is to make an open registry.
May be it can use OGC registry, but projects might want to superseed
it when request are not taken into account.
Github offer an easy way to fork data, for free.
Are you with us so ?
Regards,
Julien.
2016-09-01 21:29 GMT+02:00 Peter Baumann
<[email protected]
<mailto:[email protected]>>:
Hi Manfred,
On 09/01/2016 05:55 PM, [email protected]
<mailto:[email protected]> wrote:
> Hello Peter,
>
> Sorry, I have never heard of this standard.
it is not a standard, it is a service offered by OGC (and based
on standards).
> Is there a existing sample application using this database by OGC? Is
there a simple way to get the WKT like:
> http://www.epsg-registry.org/
the link below yields GML. Other representations can be added -
for example, the
activist group establishing here might submit WKT
representations; better,
though, would be a tool for converting from GML as EPSG does
updates every now
and then. Such a tool might get extended at some time to also
deliver JSON
representations. Ideally it would do that on the fly whenever a
CRS definition
is requested. But now I am jumping ahead - obviously there is
good room for
extension and further services, at the same time avoiding
duplication of effort.
cheers,
Peter
PS: note that this service endpoint is mainly for m2m requests,
not so much for
human inspection. Another facet for discussion.
PS2: the underlying service software is open-source (LGPL),
might be of
interest, too.
> To Luís: Maybe before we start with a new datamodel and
templates, we should look what solutions exist and collect them
in the github project and then decide?
>
> Best regards,
>
> Manfred
>
>
>
> -----Original Message-----
> From: "Peter Baumann" <[email protected]
<mailto:[email protected]>>
> Sent: Thursday, September 1, 2016 3:20am
> To: "Luís de Sousa" <[email protected]
<mailto:[email protected]>>, "[email protected]
<mailto:[email protected]>" <[email protected]
<mailto:[email protected]>>
> Cc: [email protected] <mailto:[email protected]>
> Subject: Re: [OSGeo-Discuss] Detect and define the coordinate
system of gis data with no projection information automatically
>
> Hi all,
>
> a public registry of all EPSG CRSs and their definitions is
provided by OGC
> since many years under http://www.opengis.net/ . For example,
WGS 84 is
> accessible through http://www.opengis.net/def/crs/EPSG/0/4326
<http://www.opengis.net/def/crs/EPSG/0/4326> .
>
> This service is kept in sync with EPSG releases and adds
further CRS families,
> such as Index CRSs and height CRSs and in future, once
definitions are resolved
> by OGC, also time ("temporal") CRSs. Arrangement has been made
to also host
> Planetary CRS definitions of the International Astronomical
Union (IAU).
>
> Repeating (part of) this comprehensive (and authoritative)
work may be less
> fruitful, but building additional services on top of that
might make a lot of
> sense indeed.
>
> my 2 cents,
>
> Peter
>
>
>
> On 08/28/2016 08:39 PM, Luís de Sousa wrote:
>> 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 <http://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: [email protected] <mailto:[email protected]>
>>> To: [email protected] <mailto:[email protected]>
>>>
>>> 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_EGGER_FOSS4G.pdf?t=1469787116
<http://www.egger-gis.at/app/download/13175253496/POSTER_EGGER_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/
<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 <http://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 <http://spatialrefrence.org>
>>> - epsg.io <http://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 <http://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
>>> [email protected] <mailto:[email protected]>
>>> http://lists.osgeo.org/mailman/listinfo/discuss
<http://lists.osgeo.org/mailman/listinfo/discuss>
>>
>>
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--
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- Professor of Computer Science, Jacobs University Bremen
www.faculty.jacobs-university.de/pbaumann
<http://www.faculty.jacobs-university.de/pbaumann>
mail: [email protected]
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"When the power of love overcomes the love of power the world will
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