[gdal-dev] GEOGRID projection question

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[gdal-dev] GEOGRID projection question

Michael Sumner-2
Hello, I have this output in the global attributes of a NetCDF, seemingly originating with USGS and a program called "GEOGRID" -  see print below. Does anyone happen to know what MAP_PROJ = 6 and GRIDTYPE = "C" stands for? 

The CEN_LAT/CEN_LON are sensible but TRUELAT1/TRUELAT2 look like filler, but maybe they are recorded badly asit looks like an LCC form to me. 

Appreciate any pointers. 

Thanks!

Cheers, Mike. 


// global attributes:
:TITLE = "OUTPUT FROM GEOGRID V3.2.1" ;
:SIMULATION_START_DATE = "0000-00-00_00:00:00" ;
:WEST-EAST_GRID_DIMENSION = 216 ;
:SOUTH-NORTH_GRID_DIMENSION = 145 ;
:BOTTOM-TOP_GRID_DIMENSION = 0 ;
:WEST-EAST_PATCH_START_UNSTAG = 1 ;
:WEST-EAST_PATCH_END_UNSTAG = 215 ;
:WEST-EAST_PATCH_START_STAG = 1 ;
:WEST-EAST_PATCH_END_STAG = 216 ;
:SOUTH-NORTH_PATCH_START_UNSTAG = 1 ;
:SOUTH-NORTH_PATCH_END_UNSTAG = 144 ;
:SOUTH-NORTH_PATCH_START_STAG = 1 ;
:SOUTH-NORTH_PATCH_END_STAG = 145 ;
:GRIDTYPE = "C" ;
:DX = 48918.09f ;
:DY = 48918.09f ;
:DYN_OPT = 2 ;
:CEN_LAT = -24.26f ;
:CEN_LON = 147.63f ;
:TRUELAT1 = 1.e+20f ;
:TRUELAT2 = 1.e+20f ;
:MOAD_CEN_LAT = -24.26f ;
:STAND_LON = 32.37f ;
:POLE_LAT = 60.31f ;
:POLE_LON = 321.38f ;
:corner_lats = -43.18129f, 14.5788f, 14.57882f, -43.18126f, -43.08284f, 14.64489f, 14.64489f, -43.08282f, -43.37204f, 14.78275f, 14.78277f, -43.37201f, -43.27347f, 14.84871f, 14.84871f, -43.27346f ;
:corner_lons = 83.15466f, 110.3886f, -175.1285f, -147.8946f, 82.91971f, 110.22f, -174.96f, -147.6597f, 83.00413f, 110.4739f, -175.2138f, -147.7441f, 82.76912f, 110.3056f, -175.0456f, -147.5091f ;
:MAP_PROJ = 6 ;
:MMINLU = "USGS" ;
:NUM_LAND_CAT = 24 ;
:ISWATER = 16 ;
:ISLAKE = -1 ;
:ISICE = 24 ;
:ISURBAN = 1 ;
:ISOILWATER = 14 ;
:grid_id = 1 ;
:parent_id = 1 ;
:i_parent_start = 1 ;
:j_parent_start = 1 ;
:i_parent_end = 216 ;
:j_parent_end = 145 ;
:parent_grid_ratio = 1 ;
:sr_x = 1 ;
:sr_y = 1 ;
:FLAG_MF_XY = 1 ;
}
--
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia


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Re: GEOGRID projection question

Brad Hards
Looks somewhat like it came from WRF/ARW forecast software.

Brad


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Re: GEOGRID projection question

Michael Sumner-2
Thanks!  That looks right to me, I'm exploring here and it also seems to be an ob_tran rotation, knowing that is probably enough for me to be able to fix. 


If anyone has direct experience with this kind of output and PROJ.4 I'd appreciate any pointers. 

Cheers, Mike. 


On Fri, 4 Aug 2017 at 12:17 Brad Hards <[hidden email]> wrote:
Looks somewhat like it came from WRF/ARW forecast software.

Brad


--
Dr. Michael Sumner
Software and Database Engineer
Australian Antarctic Division
203 Channel Highway
Kingston Tasmania 7050 Australia


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