Show alternate EPSG: names for the coordinate reference system

[Raruto]

Checklist

• I've searched through the current issues to make sure this feature hasn't been requested already.

Motivation

EPSG strings are hard to remember..

For example, here's what to currently look for for a user who remembers familiar with Web Mercator (WSG84) but will never remember the EPSG code.

Suggested solution

On QGIS desktop it is currently displayed like this

So, lets check if through QGIS server it is possible to concatenate the releated WGS string within the SRID select (ref: above group-creation-page).

Alternatives considered

No response

[wlorenzetti]

@Raruto Believe me it's easier to recode the code than the full name of the CRS :)

[Raruto]

I meant, show different name on frontend side only (within that <form>).

So to speak, something like this: 👉 https://jsfiddle.net/6dco0qws/

<label for="srid">Choose your SRID:</label>

<select id="srid">

  <option value="EPSG:4326">EPSG:4326 - WSG84</option>
  <option value="EPSG:3857">EPSG:3857 - WSG84 / Pseudo Mercator</option>

</select>

where individual options labels are constructed roughly like this:

if srid.startswith('EPSG:'): # <-- superfluous condition?
    
    crs = QgsCoordinateReferenceSystem(srid)
    
    if crs.isValid():
        print("<option value="{}">{} - {}</option>".format(srid, srid, crs.description()))

For more info:

• QgsCoordinateReferenceSystem.description()
• <datalist>: The HTML Data List element

[wlorenzetti]

Ok I understood, but at the moment the CRS lists is generated from this model :

g3w-admin/g3w-admin/core/models.py

Line 35 in 336b406

class G3WSpatialRefSys(models.Model):

It's a place to refactor and just use the QGIS API to get the list of SRIDs.