[Geoserver-devel] [JIRA] (GEOS-7577) Alignment published NAD27 data with WGS84 base map data

_Failed_to_Retrieve · June 9, 2016, 7:34pm

Jody Garnett [Administrator] created an issue

Alignment published NAD27 data with WGS84 base map data

Issue Type:	Bug
Affects Versions:	2.9.0
Assignee:	Unassigned
Components:	WMS
Created:	09/Jun/16 9:33 PM
Environment:	GeoServer 2.9.x (configured with user_projections with conus.los and conus.las grid-shift files )
Priority:	High
Reporter:	Jody Garnett [Administrator]

Lets turn back the clock to a NAD27/EPSG:4267 data set:

https://tnris.org/data-catalog/entry/original-texas-land-survey/ (1 MB / CC0 data)

When this data is published via GeoServer and displayed in an WGS84/EPSG:4326 map the results do not quite line up (see attached screen snaps).

We expect this will require both:

an ellipse shift between clark6* and a wgs84
and a datum shift between NAD27 and NAD83

We assume one of the systems is going through NAD27 → NAD83 and doing a small small transform to WGS84, while we assume the other system is just doing the ellipse shift.

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