[Gdal-dev] Newbie (ogr2ogr reprojecting NZMG to NZTM)

[andrew.haywood at poyry.com]

Dear List,

i am having some problems with reprojecting shapefiles from NZMG to NZTM. 
I have copied the nzgd2kgrid0005.1gsb into the projlib directory (on my 
Suse 10.2 installation it is in the 

if i run the following command

ogr2ogr -f "ESRI Shapefile" north_island_nztm.shp 'FRWP/Active/38A08772 
MfE_Mapping forest harvesting using MODIS satellite 
data/GIS/LCDB2_North_Island_Forest_Classes.shp' -s_srs "+proj=nzmg 
+lat_0=-41 +lon_0=173 +x_0=2510000 +y_0=6023150 +ellps=intl +datum=nzgd49 
+units=m +nadgrids=nzgd2kgrid0005.1gsb +wktext" -t_srs EPSG:2193

then run the following 

ogrinfo -summary north_island_nztm.shp north_island_nztm

i get the following output. Where the datum is "Mean_Sea_Level" - which i 
suspect is incorrect. I thought the datum should have been NZGD2000. Any 
help would be greatly appreciated.

best regards.



INFO: Open of `north_island_nztm.shp'
      using driver `ESRI Shapefile' successful.

Layer name: north_island_nztm
Geometry: Polygon
Feature Count: 104978
Extent: (1518858.988989, 5392310.766727) - (2089515.826863, 
6221064.447185)
Layer SRS WKT:
PROJCS["NZGD2000 / New Zealand Transverse Mercator",
    GEOGCS["NZGD2000",
        DATUM["Mean_Sea_Level",
            SPHEROID["GRS_1980",6378137,298.257222101]],
        PRIMEM["Greenwich",0],
        UNIT["Degree",0.017453292519943295]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",173],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",1600000],
    PARAMETER["false_northing",10000000],
    UNIT["Meter",1]]
AREA: Real (19.5)
PERIMETER: Real (19.5)
NI_NZMG_: Real (11.0)
NI_NZMG_ID: Real (11.0)
LCDB1CLASS: Real (11.0)
LCDB1NAME: String (40.0)
LCDB2CLASS: Real (11.0)
LCDB2NAME: String (40.0)
WET_CONTEX: String (3.0)
HECTARES: Real (19.2)
TA_ID: Real (11.0)
TA_NAME: String (50.0)
REGION_ID: Real (11.0)
REGION_NAM: String (50.0)



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