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I have downloaded a bathymetric dataset from this web site (http://portal.emodnet-bathymetry.eu/#) in GeoTIFF format. It uses GCS_WGS_1984 coordinate system.

I have to make the dataset match the coordinate system of a DTM I have, which uses European Datum 1950, UTM 33N. In ArcGIS (10.1), I tried the 'Project Raster' facility, but it does need me to specify a geographic transformation to be selected from a drop-down menu. There seems to be no transformation suitable from the task at hand.

How can I project the bathymetric dataset to match the DTM, given the absence (in ArcGIS 10.1 at least) of a suitable transformation?

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    10.1 is ancient software. Recent questions indicate that such transformations are now possible. – Vince Feb 13 at 11:30
  • I could try in QGIS. Do you know if that would be feasible? – NewAtGis Feb 13 at 11:36
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    That's a very different question (and ought to be a different Question) – Vince Feb 13 at 11:48
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    If you add it to ArcMap, do you get any transformations there? It's possible that this bathymetric data is outside the areas-of-use for the ED50-WGS84 transformations. If you can get a transformation in ArcMap, export the raster from there using the data frame's coordinate system. – mkennedy Feb 20 at 1:40
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Without ArcGIS you could try GDAL utilities. A command like the below should work:

gdalwarp -s_srs EPSG:4326 -t_srs EPSG:23033 emodnet.tiff outputfile.tiff
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ED_1950_To_WGS_1984_1 is a general transformation for Western Europe. It will give you accuracy to within 10 meters.

Descriptions of other transformations for ArcMap 10.1 can be found here: http://downloads2.esri.com/support/TechArticles/Geographic_Transformations_10.1.zip

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