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

Markus Neteler neteler at itc.it
Wed Nov 15 04:08:49 EST 2006


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]]
> 
> -t_srs targetp.prj
> 
> PROJCS["ETRF_1989_UTM_Zone_32N",
> GEOGCS["GCS_ETRF_1989",
> DATUM["D_ETRF_1989",
> SPHEROID["WGS_1984",6378137.0,298.257223563]],
> PRIMEM["Greenwich",0.0],
> UNIT["Degree",0.0174532925199433]],
> PROJECTION["Transverse_Mercator"],
> PARAMETER["False_Easting",500000.0],
> PARAMETER["False_Northing",0.0],
> PARAMETER["Central_Meridian",9.0],
> PARAMETER["Scale_Factor",0.9996],
> PARAMETER["Latitude_Of_Origin",0.0],
> UNIT["Meter",1.0]]
> 
> i`ve looked into the warped tif-file. there is an offset of about 120 m in north-south-direction.
> should i try gdalwarp maybe with the according epsg-code for source and target?
> 
> gdalwarp of fwtools 1.0.8 on win 2000-machine
> 
> with greetings from austria and thanks in advance

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.

Markus

-- 
Markus Neteler  <neteler itc it>  http://mpa.itc.it/markus/
ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18        -       38050 Povo (Trento), Italy



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