Accuracy issue reprojecting between EPSG:27572 and EPSG:2154

Description

From email:

Situation :

  • Geoserver 2.12.3 (olders have been tested too with same observations)

  • A first layer is created to load a shape projected in 27572

  • A second one is created to load a raster projected in 2154

  • An agregation is created to mix these two layers, projected in 27572.


Problem :

  • The shape is not well placed on the raster, not very far but not good.

If I compare the definition of the projection and the projection on https://epsg.io/, I can see that there is some differences (parameters TOWGS84 is missing, some values are differents…).
I can then use epsg_overrides.properties to define the projection given in epsg.io.
Unfortunately, the result is worst.

After further try, I mixed the native parameters of 27572 known in GeoServer and official parameters given on epsg.io and obtain something good :

I hope it could help.

Clément

Environment

None

Assignee

Unassigned

Reporter

Jody Garnett

Triage

None

Components

Affects versions

Priority

Medium
Configure