Ticket #2225 (closed defect: fixed)

Opened 3 months ago

Last modified 3 months ago

HDF4: Georeferencing from NRL Projected Products

Reported by: warmerdam Assigned to: warmerdam
Priority: high Milestone: 1.5.1
Component: GDAL_Raster Version: unspecified
Severity: normal Keywords: HDF4
Cc: malaret@actgate.com

Description

Some NRL (Naval Research Laboratory) products are projected, bug GDAL does not read the product specific georeferencing information.

eg. 

  mapProjectionSystem=NRL(USGS)
  mapProjection=GreatLakes250
  mapUpperLeft=44.33, -84
  mapUpperRight=44.33, -80.9502444183969
  mapLowerLeft=41.2386810530222, -83.9025410591084
  mapLowerRight=41.2386810530222, -81.0013984519859

Actually means that the GCTP parameters for the projection are in an SDS named GreatLakes?250. Some additinonal info is available at:

http://www7333.nrlssc.navy.mil/docs/aps_v3.4/user/aps/ch07s02.html

Change History

02/14/08 09:55:34 changed by warmerdam

  • status changed from new to closed.
  • resolution set to fixed.

The contents of the GCTP parameter block were a bit ambiguous (29 values in the block) so PaulM from NRL clarified that these are: 

The first value is a version # (the 1).
The second value is USGS projection system number
The third value is the zone
The fourth value is the spheroid number (12 = WGS84)
Values 5th to 19th are the 15 USGS projection parameters.

The support for handling this has been incorporated into the existing CaptureNRLGeoTransform() function in trunk (r13779) and in 1.5 branch (r13780).