dhis2-users team mailing list archive

[Knut Staring <knutst@xxxxxxxxx>]

In fact, you could probably also use the .prj file directly, like this
(I think):

ogr2ogr s_srs projectionfile.prj a_srs EPSG:4326 -f GML filename.gml
filename.shp

http://help.nceas.ucsb.edu/GDAL
http://www.bostongis.com/PrinterFriendly.aspx?content_name=ogr_cheatsheet

Knut

On Wed, Nov 17, 2010 at 11:21 AM, Knut Staring <knutst@xxxxxxxxx> wrote:
>> On Wed, Nov 17, 2010 at 10:38 AM, Friedman, Roger (CDC/CGH/DGHA) (CTR)
>> <rdf4@xxxxxxx> wrote:
>>>    There may be something wrong with my shapefile to GeoJSON conversion.
>>> The polygon vertices are looking like 254808.379, 1999087.952 while lat/lon
>>> of an interior point is 9.82,-2.68.  Does ogr use the .prj file or do I have
>>> to pass params on the command line?
>
> Your .prj file has the following content:
>
> PROJCS["Accra_Ghana_Grid",GEOGCS["GCS_Accra",DATUM["D_Accra",SPHEROID["War_Office",6378300,296]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943299]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",900007.2200889268],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",-1],PARAMETER["Scale_Factor",0.99975],PARAMETER["Latitude_Of_Origin",4.666666666666667],UNIT["Foot_Clarke",0.30479726499999998]]
>
> Pasting this tool http://prj2epsg.org/search yields a lot of
> possibilities, but I would think EPSG 2136 - Accra / Ghana National
> Grid would be right.
>
> To convert this to lat/lon, you have to pass reprojection parameters
> on the command line like this:
>  ogr2ogr s_srs EPSG:2236 a_srs EPSG:4326 -f GML filename.gml filename.shp
>
> Alternatively, you could use the excellent open source Quantum GIS
> tool (http://www.qgis.org), which has now incorporated ogr in the
> latest version (1.5).
>
> Knut
>



-- 
Cheers,
Knut Staring