MAKGDS
The MAKGDS routine makes or breaks a grid description section.
It can do one of the following:
(IOPT=-1) unpack a GDS into w3fi63 kgds integer form
(IOPT=255) pack a GDS from W3FI63 KGDS integer form
(IOPT<255) pack a GDS from an NCEP grid identification.
USAGE: CALL MAKGDS(IOPT,KGDS,GDS,LENGDS,IRET)
Input argument list:
IOPT - INTEGER OPTION
IOPT=-1 TO UNPACK GDS INTO KGDS;
IOPT=255 TO USE KGDS TO PACK GDS;
IOPT<255 NCEP GRID ID TO MAKE GDS AND KGDS.
KGDS - INTEGER (200) W3FI63-STYLE UNPACKED GDS (IF IOPT=255)
(ONLY FIRST 22 VALUES ARE ACCESSED IF KGDS(20)=255.)
(SEE REMARKS BELOW FOR A DETAILED DESCRIPTION OF KGDS.)
GDS - CHARACTER (400) GRID DEFINITION SECTION (IF IOPT=-1)
Output argument list:
KGDS - INTEGER (200) W3FI63-STYLE UNPACKED GDS (IF IOPT<255)
(ONLY FIRST 22 VALUES ARE ACCESSED IF KGDS(20)=255.)
(SEE REMARKS BELOW FOR A DETAILED DESCRIPTION OF KGDS.)
GDS - CHARACTER (400) GRID DEFINITION SECTION (IF IOPT>0)
LENGDS - INTEGER LENGTH OF THE GDS (IF IOPT>0)
IRET - INTEGER RETURN CODE
0 SUCCESSFUL
1 GRID REPRESENTATION TYPE NOT VALID
4 DATA REPRESENTATION TYPE NOT CURRENTLY ACCEPTABLE
REMARKS:
THE KGDS PARAMETERS ARE DESCRIBED BELOW
AS COPIED FROM THE W3FI63 DOCBLOCK.
(1) - DATA REPRESENTATION TYPE
(19) - NUMBER OF VERTICAL COORDINATE PARAMETERS
(20) - OCTET NUMBER OF THE LIST OF VERTICAL COORDINATE
PARAMETERS
OR
OCTET NUMBER OF THE LIST OF NUMBERS OF POINTS
IN EACH ROW
OR
255 IF NEITHER ARE PRESENT
(21) - FOR GRIDS WITH PL, NUMBER OF POINTS IN GRID
(22) - NUMBER OF WORDS IN EACH ROW
LATITUDE/LONGITUDE GRIDS
(2) - N(I) NR POINTS ON LATITUDE CIRCLE
(3) - N(J) NR POINTS ON LONGITUDE MERIDIAN
(4) - LA(1) LATITUDE OF ORIGIN
(5) - LO(1) LONGITUDE OF ORIGIN
(6) - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
(7) - LA(2) LATITUDE OF EXTREME POINT
(8) - LO(2) LONGITUDE OF EXTREME POINT
(9) - DI LATITUDINAL DIRECTION OF INCREMENT
(10) - DJ LONGITUDINAL DIRECTION INCREMENT
(11) - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
GAUSSIAN GRIDS
(2) - N(I) NR POINTS ON LATITUDE CIRCLE
(3) - N(J) NR POINTS ON LONGITUDE MERIDIAN
(4) - LA(1) LATITUDE OF ORIGIN
(5) - LO(1) LONGITUDE OF ORIGIN
(6) - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
(7) - LA(2) LATITUDE OF EXTREME POINT
(8) - LO(2) LONGITUDE OF EXTREME POINT
(9) - DI LATITUDINAL DIRECTION OF INCREMENT
(10) - N - NR OF CIRCLES POLE TO EQUATOR
(11) - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
(12) - NV - NR OF VERT COORD PARAMETERS
(13) - PV - OCTET NR OF LIST OF VERT COORD PARAMETERS
OR
PL - LOCATION OF THE LIST OF NUMBERS OF POINTS IN
EACH ROW (IF NO VERT COORD PARAMETERS
ARE PRESENT
OR
255 IF NEITHER ARE PRESENT
POLAR STEREOGRAPHIC GRIDS
(2) - N(I) NR POINTS ALONG LAT CIRCLE
(3) - N(J) NR POINTS ALONG LON CIRCLE
(4) - LA(1) LATITUDE OF ORIGIN
(5) - LO(1) LONGITUDE OF ORIGIN
(6) - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
(7) - LOV GRID ORIENTATION
(8) - DX - X DIRECTION INCREMENT
(9) - DY - Y DIRECTION INCREMENT
(10) - PROJECTION CENTER FLAG
(11) - SCANNING MODE (RIGHT ADJ COPY OF OCTET 28)
SPHERICAL HARMONIC COEFFICIENTS
(2) - J PENTAGONAL RESOLUTION PARAMETER
(3) - K " " "
(4) - M " " "
(5) - REPRESENTATION TYPE
(6) - COEFFICIENT STORAGE MODE
MERCATOR GRIDS
(2) - N(I) NR POINTS ON LATITUDE CIRCLE
(3) - N(J) NR POINTS ON LONGITUDE MERIDIAN
(4) - LA(1) LATITUDE OF ORIGIN
(5) - LO(1) LONGITUDE OF ORIGIN
(6) - RESOLUTION FLAG (RIGHT ADJ COPY OF OCTET 17)
(7) - LA(2) LATITUDE OF LAST GRID POINT
(8) - LO(2) LONGITUDE OF LAST GRID POINT
(9) - LATIT - LATITUDE OF PROJECTION INTERSECTION
(10) - RESERVED
(11) - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
(12) - LONGITUDINAL DIR GRID LENGTH
(13) - LATITUDINAL DIR GRID LENGTH
LAMBERT CONFORMAL GRIDS
(2) - NX NR POINTS ALONG X-AXIS
(3) - NY NR POINTS ALONG Y-AXIS
(4) - LA1 LAT OF ORIGIN (LOWER LEFT)
(5) - LO1 LON OF ORIGIN (LOWER LEFT)
(6) - RESOLUTION (RIGHT ADJ COPY OF OCTET 17)
(7) - LOV - ORIENTATION OF GRID
(8) - DX - X-DIR INCREMENT
(9) - DY - Y-DIR INCREMENT
(10) - PROJECTION CENTER FLAG
(11) - SCANNING MODE FLAG (RIGHT ADJ COPY OF OCTET 28)
(12) - LATIN 1 - FIRST LAT FROM POLE OF SECANT CONE INTER
(13) - LATIN 2 - SECOND LAT FROM POLE OF SECANT CONE INTER
| iplib.tar |
Library contains subroutines to be used for
interpolating almost any grids used at NCEP. (Fortran90)
Date posted: 2/22/2007 |