[Geoserver-users] epsg2700 overlays on top of bing maps are not aligned

GeoServer GeoServer User
1

I am using BING aerial as a base map and trying to move the map to a coordinate and add a marker

The search system I am using stores its coordinates in EPSG:27700 , I am re projecting using proj4s to EPSG:900913

The map is in roughly the right area but is 50 mteres or so out

Any idea why ?

Mark Ismail

Principal IT Officer

Tel: 0151 443 3021

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2

On Wed, May 7, 2014 at 1:47 PM, Ismail, Mark <mark.ismail@anonymised.com>wrote:

I am using BING aerial as a base map and trying to move the map to a
coordinate and add a marker

The search system I am using stores its coordinates in EPSG:27700 , I am
re projecting using proj4s to EPSG:900913

The map is in roughly the right area but is 50 mteres or so out

Any idea why ?

Might be due to wrong datum shifts params, or lack of a grid based
transformation (ntv2 and the like)
to make a precise datum shift.
If you are using proj4s to do the transformations, you should probably ask
on their mailing list (if they have any)

Cheers
Andrea

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