[GRASS5] GRASS and MODIS V004 SIN projection?

[Markus Neteler]

A followup:

On Fri, Aug 01, 2003 at 03:49:14PM +0200, Markus Neteler wrote:
[...]
> The MODIS V004 LST metadata say (excerpt from
>  http://mpa.itc.it/markus/modis/MOD11A1.A2000055.h18v04.004.2002355023354.StructMetadata.0 
> ):
>                 UpperLeftPointMtrs=(0.000000,5559752.598833)
>                 LowerRightMtrs=(1111950.519767,4447802.079066)
>                 Projection=GCTP_SNSOID
>                 ProjParams=(6371007.181000,0,0,0,0,0,0,0,86400,0,0,0,0)
> 
> 
> The HDFEOS software interprets above:
> http://asl.umbc.edu/pub/motteler/hdf/hdfeos/hdfeos/src/GDapi.c
> intn
> GDprojinfo(int32 gridID, int32 * projcode, int32 * zonecode,
> 	   int32 * spherecode, float64 projparm[])
> 
> -> projparm[0] = 6371007.181000
> -> projparm[8] = 86400

The parameter order is explained here:
http://modland.nascom.nasa.gov/developers/is_tiles/is_gctp.html
0 Sphere 6371007.181 Radius of reference (meters) sphere
4 CentMer 0.0 Longitude of the central meridian
8 NZone 86400.0 Number of equally spaced latitudinal zones (rows). Must be 2 or larger and even.

The other values seem not to be important.

Markus