[gdal-dev] Issue with WKT to proj4

[Frank Warmerdam]

On 11-05-27 06:49 PM, David J. Bakeman wrote:
> Frank Warmerdam wrote:
>> On 11-05-27 04:42 PM, David J. Bakeman wrote:
>>> Is there a valid proj4 description of the following coordinate system in wkt?
>>>
>>> GEOGCS["WGS84_ds",
>>> DATUM["D_WGS_1984",
>>> SPHEROID["WGS_1984",6378137.0,298.257223563]],
>>> PRIMEM["Greenwich",0.0],
>>> UNIT["Second",0.00000484813681109536]]
>>>
>>
>> David,
>>
>> I do not believe there is any way to make PROJ.4 use angular units other
>> than decimal degrees for geographic coordinate systems (+proj=latlong).
> I thought that ogr used proj4 to do the coordinate transform? Does that mean
> that ogr2ogr is converting using it's own transforms? It is converting the
> shape correctly.


David,

While in theory OGR can use other coordinate system transformation
libraries, in practice this is not used.   I don't know how ogr2ogr
could be handling something in arcseconds properly.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent