gdll

FORTRAN

 
integer gdll, ier
ier = gdll(gdid, lat, lon)
integer gdid
real lat(*), lon(*)

C

 
int c_gdll (int gdid,  float *lat, float *lon)

Routine description

gdll returns the lat-lon positions of each grid points of the grid referred by gdid.

Description of parameters

gdid

a valid grid identifier (returned by ezqkdef or ezgdef) that will be used as the source (input) grid.

lat, lon

Stream of latitude and longitude points. The dimensions of the arrays lat() and lon() are assumed to be the same as the grid referred to gdid.

x,y

Position of the points on the grid, in grid coordinates.

n

Number of points

?

Sample FORTRAN code :

The following code computes the lat-lon coordinates of each grid point on a GEM grid. It does essentially the same work as gdll. Assume necessary memory space has been allocated.

      datev  = -1
      etiket = '        '
      typvar = ' '
      nomvar = 'GZ'
      ip1 = 500
      ip2 = 0
      ip3 = -1
      iun = 13
      
***   read fld info and data
      key = FSTINF(iun, NI, NJ, NK, datev, etiket, ip1, ip2, ip3, typvar, nomvar) 
      ier = FSTPRM(key, DATEO, DEET, NPAS, NI, NJ, NK, NBITS, DATYP, IP1,
     $     IP2, IP3, TYPVAR, NOMVAR, ETIKET, GRTYP, IG1, IG2, IG3,
     $     IG4, SWA, LNG, DLTF, UBC, EX1, EX2, EX3)
***   Define input grid         
      
      gdgem = ezqkdef(nigem,njgem ,'Z',ig1, ig2, ig3, ig4, iun)
***   Gets latlon values for gdid "gdgem"
 
      ier = gdll(gdgem, lat, lon)

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