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c
c In this example we will open an HDF file and create UTM and Polar
c Stereographic grid structures within the file.
c
program setupgrid
integer status, gddefdim
integer gddetach, gdclose
integer*4 gdfid, gdid, gdid2, gdid3, gdopen, gdcreate
integer*4 xdim, ydim
integer*4 zonecode, spherecode
real*8 uplft(2), lowrgt(2), projparm(16), ehconvang
integer DFACC_CREATE
parameter (DFACC_CREATE=4)
integer SD_UNLIMITED
parameter (SD_UNLIMITED=0)
integer GCTP_UTM
parameter (GCTP_UTM=1)
integer GCTP_PS
parameter (GCTP_PS=6)
integer GCTP_GEO
parameter (GCTP_GEO=0)
integer HDFE_GD_LR
parameter (HDFE_GD_LR=3)
integer HDFE_DEG_DMS
parameter (HDFE_DEG_DMS=3)
c
c We first open the HDF grid file, "GridFile.hdf". Because this
c file does not already exist, we use the DFACC_CREATE access
c code in the open statement. The GDopen routine returns the grid
c file id, gdfid, which is used to identify the file in subsequent
c routines in the library.
c
gdfid = gdopen("GridFile_created_with_hadeos_sample_file_write"//
1"r_of_HDFEOS2_version_219_or_higher_release.hdf",DFACC_CREATE)
c
c Create UTM Grid
c
c Region is bounded by 54 E and 60 E longitude and 20 N and 30 N latitude.
c UTM Zone 40
c
c Use default spheriod (Clarke 1866 - spherecode = 0)
c
c Grid into 120 bins along x-axis and 200 bins along y-axis
c (approx 3' by 3' bins)
zonecode = 40
spherecode = 0
c Upper Left and Lower Right points in meters
c -------------------------------------------
uplft(1) = 210584.50041
uplft(2) = 3322395.95445
lowrgt(1) = 813931.10959
lowrgt(2) = 2214162.53278
xdim = 120
ydim = 200
gdid = gdcreate(gdfid, "UTMGrid", xdim, ydim, uplft, lowrgt)
status = gddefproj(gdid, GCTP_UTM, zonecode,
1 spherecode, projparm)
c Define "Time" Dimension
status = gddefdim(gdid, "Time", 10)
c
c Create polar stereographic grid
c
c Northern Hemisphere (True Scale at 90 N, 0 Longitude below pole)
c
c Use International 1967 spheriod (spherecode = 3)
c
c Grid into 100 bins along x-axis and y-axis
c
xdim = 100
ydim = 100
spherecode = 3
c Define GCTP Projection Parameters
c ---------------------------------
do i=1,16
projparm(i) = 0
enddo
c Set Longitude below pole & true scale in DDDMMMSSS.SSS format)
projparm(5) = 0.0
projparm(6) = 90000000.00
c Use default boundaries for Polar Stereographic (hemisphere)
uplft(1) = 0
uplft(2) = 0
lowrgt(1) = 0
lowrgt(2) = 0
gdid2 = gdcreate(gdfid, "PolarGrid", xdim, ydim, uplft, lowrgt)
status = gddefproj(gdid2, GCTP_PS, 0, spherecode, projparm)
status = gddeforigin(gdid2, HDFE_GD_LR)
c Define "Bands" Dimension
status = gddefdim(gdid2, "Bands", 3)
c
c Create geographic (linear scale) grid
c
c 0 - 15 degrees longitude, 20 - 30 degrees latitude
c
xdim = 60
ydim = 40
uplft(1) = ehconvAng(0.d0, HDFE_DEG_DMS)
uplft(2) = ehconvAng(30.d0, HDFE_DEG_DMS)
lowrgt(1) = ehconvAng(15.d0, HDFE_DEG_DMS)
lowrgt(2) = ehconvAng(20.d0, HDFE_DEG_DMS)
gdid3 = gdcreate(gdfid, "GEOGrid", xdim, ydim, uplft, lowrgt)
status = gddefproj(gdid3, GCTP_GEO, 0, 0, 0)
c
c We now close the grid interface with the GDdetach routine. This step
c is necessary to properly store the grid information within the file
c AND SHOULD BE DONE BEFORE WRITING OR READING DATA TO OR FROM THE FIELD.
c
status = gddetach(gdid)
status = gddetach(gdid2)
status = gddetach(gdid3)
c
c Finally, we close the grid file using the gdclose routine. This will
c release the grid file handles established by gdopen.
c
status = gdclose(gdfid)
stop
end
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