[GRASS-dev] projection system in metadata [was: Re: <GSoC 2015> <Improved metada for GRASS GIS> <week 4>]

[Moritz Lennert]

On 22/06/15 15:40, Margherita Di Leo wrote:
> Hi,
>
> On Mon, Jun 22, 2015 at 10:18 AM, Moritz Lennert
> <mlennert at club.worldonline.be <mailto:mlennert at club.worldonline.be>> wrote:
>
>     Hi Matej,
>
>     Thank you for the updates.
>
>     I have one question concerning the metadata templates: do I
>     understand correctly that by default, neither the basic, nor the
>     inspire template contain a reference to the projection system ?
>
>     IIUC, INSPIRE currently does not impose this, but I don't really
>     understand how such basic information can be missing from the
>     metadata. What help is the bounding box info, if we don't know in
>     which CRS it is ?
>
>
> I agree that it sounds strange, however the bounding box is given in
> geographic (unprojected) coordinates, and the ISO 19115:2003, where the
> GeographicBoundingBox comes from, reads (B.3.2.1): "geographic position
> of the dataset NOTE This is only an approximate reference so specifying
> the coordinate reference system is unnecessary "

Using g.gui.metadata on the hospitals map in nc_spm_08, I get:

       <gmd:extent>
                 <gmd:EX_Extent>
                     <gmd:geographicElement>
                         <gmd:EX_GeographicBoundingBox>
                             <gmd:westBoundLongitude>
                                 <gco:Decimal>308097.937400562</gco:Decimal>
                             </gmd:westBoundLongitude>
                             <gmd:eastBoundLongitude>
                                 <gco:Decimal>20235.5644005626</gco:Decimal>
                             </gmd:eastBoundLongitude>
                             <gmd:southBoundLatitude>
                                 <gco:Decimal>914347.8748615</gco:Decimal>
                             </gmd:southBoundLatitude>
                             <gmd:northBoundLatitude>
                                 <gco:Decimal>156998.1718615</gco:Decimal>
                             </gmd:northBoundLatitude>
                         </gmd:EX_GeographicBoundingBox>
                     </gmd:geographicElement>
                 </gmd:EX_Extent>
             </gmd:extent>

Looks like projected coordinates to me...

Moritz