C **** cterp.h.1 C **** /TERP/QUANTITIES NEEDED TO TRANSFORM SCALAR FIELDS cterp.h.2 C **** BETWEEN GEOGRAPHIC AND GEOMAGNETIC COORDINATE SYSTEMS. cterp.h.3 C **** THESE ARE CALCULATED BY: cterp.h.4 C **** GRDSTM (GEOGRAPHIC TO GEOMAGMETIC) AND cterp.h.5 C **** GRDSET (GEOMAGNETIC TO GEOGRAPHIC) cterp.h.6 C **** cterp.h.7 COMMON/TERP1/IG(IMAXMP,JMAXM),JG(IMAXMP,JMAXM),WT(4,IMAXMP,JMAXM) cterp.h.8 C **** cterp.h.11 C **** WHERE: cterp.h.12 C **** ZIMX=72, ZJMX=36, IMAXM=80, JMAXM=97, ZIMXP1=ZIMX+1, cterp.h.13 C **** ZJMXP1=ZJMX+1,IMAXMP=IMAXM+1 cterp.h.14 C **** IG AND JG GIVE GEOGRAPHIC GRID ELEMENT CONTAINING cterp.h.15 C **** EACH EACH GEOMAGNETIC GRID POINT. cterp.h.16 C **** WT(4) = INTERPOLATION WEIGHTS TO BE APPLIED TO cterp.h.17 C **** FUNCTION VALUES AT 4 CORNERS OF GEOGRAPHIC GRID cterp.h.18 C **** ELEMENT (IG,JG) cterp.h.19 C **** IM AND JM DEFINE GEOMAGNETIC GRID ELEMENT CONTAINING cterp.h.20 C **** EACH GEOGRAPHIC GRID POINT. cterp.h.21 C **** DIM AND DJM ARE FRACTIONS IN I AND J DIRECTIONS USED cterp.h.22 C **** FOR BILINEAR INTERPOLATION IN GEOMAGNETIC GRID cterp.h.23 C **** ELEMENT. cterp.h.24 C **** cterp.h.25 C cterp.h.26