Am 11.09.2013 15:26, schrieb James David Smith:
Hi there,
I'm trying to make a custom project string so that I can view a NetCDF
file in QGIS. I have data about the projection, but am struggling to
make a PROJ string from it that QGIS requires. Could someone help me
please? The fields that I can get from the file are as follows. I am
also informed that it is Lambert Conformal Conic .
P_ALP = 46. ; Double: First map projection descriptive parameter
(dependent on projection type)
P_BET = 46. ; Double: Second map projection descriptive parameter
(dependent on projection type)
P_GAM = 17. ; Double: Third map projection descriptive parameter
(dependent on projection type)
XCENT = 17. ; Double: Longitude for coordinate system center
YCENT = 46. ; Double: Latitude for coordinate system center
XORIG = -1219510. ; X-coordinate for lower-left (southwest) corner of
the grid with respect to (XCENT,YCENT) (dependent on projection type)
YORIG = 706490. ; Y-coordinate for lower-left (southwest) corner of
the grid with respect to (XCENT,YCENT) (dependent on projection type)
XCELL = 20. ; Double: X-coordinate grid cell size (dependent on projection type)
YCELL = 20. ; Double: Y-coordinate grid cell size (dependent on projection type)
Is this enough information to make the projection string?
After consulting this page:
http://niceguy.wustl.edu/mapserver/temp/HTML/GRIDS.html
it might be the follwoing projection:
+proj=lcc +lat_1=46.0 +lat_2=46.0 +lat_0=46.0 +lon_0=17.0 +ellps=GRS80
+towgs84=0,0,0,0,0,0,0 +units=m +no_defs
The XORIG,YORIG,XCELL and YCELL are not used for the projection.
HTH,
André Joost
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