Basemaps are out

NickAskew · ‎06-12-2012

I have created a map using a shape file supplied by a partner overlaid on one of the built in basemaps. The problem is that the two are not coincident.

I have confirmed that the location is correct by taking the location reported for a point and running that through a coordinate transformation from the local coordinate system (RD, 28992) to WGS84 and confirming the location. Given the partner is the local authority I thought it highly unlikely that there data was off but not impossible. So I downloaded a shape file from the kadaster (the national land registry) who really should know what they are talking about and found they had the same shift. It seems that all the standard basemaps have the same shift. Is this a known bug? Is there a fix coming?

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Here is the projection file I'm using

PROJCS["RD_New",GEOGCS["GCS_Amersfoort",DATUM["D_Amersfoort",SPHEROID["Bessel_1841",6377397.155,299.1528128]],TOWGS84[565.04,49.91,465.84,-1.9848,1.7439,-9.0587,4.0772],PRIMEM["Greenwich",0.0],UNIT["Degree",0.017453292519943295]],PROJECTION["Double_Stereographic"],PARAMETER["False_Easting",155000.0],PARAMETER["False_Northing",463000.0],PARAMETER["Central_Meridian",5.38763888888889],PARAMETER["Scale_Factor",0.9999079],PARAMETER["Latitude_Of_Origin",52.1561605555555],UNIT["Meter",1.0],AUTHORITY["EPSG","28992"]]

MarkBockenhauer · ‎06-13-2012

Try seting the Geographic Transformation.

Map Properties -> 2D coordinate system or 3D coordinate system and choose the transformation for the coordinate system of your data.

http://webhelp.esri.com/arcgisexplorer/1700/en/map_properties_coordinate_systems.htm#

NickAskew · ‎06-13-2012

Mark,

Thanks, that seems to be about perfect. In case someone else has the same problem, I set the display to WGS_1984_Web_Mercator_Auxilliary_Sphere. I set the transform to Amersfoort_To_WGS_1984_2. I have to admit that I do not know why it should be the _2 version instead of one of the many others available but the result is close enough for my purposes.

Thanks again

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