[Gdal-dev] gdalwarp - from Monte_Mario_Italy_1 to ETRF_1989_UTM_Zone_32N - offset ca. 120 m

[Frank Warmerdam]

> On Wed, Nov 15, 2006 at 08:18:07AM +0100, Helmut Kudrnovsky wrote:
>> hi,
>>
>> i have a tif-file with a world-file and warped the file with prj-files from arcgis for source and target.
>>
>> -s_srs sourcep.prj
>>
>> PROJCS["Monte_Mario_Italy_1",
>> GEOGCS["GCS_Monte_Mario",
>> DATUM["D_Monte_Mario",
>> SPHEROID["International_1924",6378388.0,297.0]],
>> PRIMEM["Greenwich",0.0],
>> UNIT["Degree",0.0174532925199433]],
>> PROJECTION["Transverse_Mercator"],
>> PARAMETER["False_Easting",500000.0],
>> PARAMETER["False_Northing",-5000000.0],
>> PARAMETER["Central_Meridian",9.0],
>> PARAMETER["Scale_Factor",0.9996],
>> PARAMETER["Latitude_Of_Origin",0.0],
>> UNIT["Meter",1.0]]
...

Markus Neteler wrote:
> helli,
> 
> you are lacking the datum information for Monte Mario:
> (grep'ed from GRASS):
> 
> rome40 "towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68" "Italy (Peninsular Part)" "Accuracy 3-4m"
> rome40 "towgs84=-168.6,-34.0,38.6,-0.374,-0.679,-1.379,-9.48" "Italy (Sardinia)" "Accuracy 3-4m"
> rome40 "towgs84=-50.2,-50.4,84.8,-0.690,-2.012,0.459,-28.08" "Italy (Sicily)" "Accuracy 3-4m"
> 
> which needs to be added as additional parameter.

I would add that the datum shift info can be merged into the Well Known Text
.prj file.  I assume the above parameters apply to D_Monte_Mario in which
case source.prj might look like:

PROJCS["Monte_Mario_Italy_1",
GEOGCS["GCS_Monte_Mario",
DATUM["D_Monte_Mario",
SPHEROID["International_1924",6378388.0,297.0],
TOWGS84[-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000.0],
PARAMETER["False_Northing",-5000000.0],
PARAMETER["Central_Meridian",9.0],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]

Best regards,
-- 
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