#define DEFINED_VAL(x) ((x) < UNDEFINED_LOW || (x) > UNDEFINED_HIGH).

#define GB2_Center(sec) UINT2(sec[1][5], sec[1][6]).

#define GB2_Discipline(sec) ((int) (sec[0][6])).

#define GB2_LocalTable(sec) ((int) (sec[1][10])).

#define GB2_MasterTable(sec) ((int) (sec[1][9])).

#define GB2_ParmCat(sec) (sec[4][9]).

#define GB2_ParmNum(sec) (sec[4][10]).

#define GB2_ProdDefTemplateNo(sec) (UINT2(sec[4][7],sec[4][8])).

#define GB2_Sec3_npts(sec) uint4(sec[3]+6).

#define GB2_Subcenter(sec) UINT2(sec[1][7], sec[1][8]).

#define GDS_Lambert_dx(gds) (int4(gds+55) * 0.001).

#define GDS_Lambert_dy(gds) (int4(gds+59) * 0.001).

#define GDS_Lambert_La1(gds) (int4(gds+38) * 0.000001).

#define GDS_Lambert_LatD(gds) (int4(gds+47) * 0.000001).

#define GDS_Lambert_Latin1(gds) (int4(gds+65) * 0.000001).

#define GDS_Lambert_Latin2(gds) (int4(gds+69) * 0.000001).

#define GDS_Lambert_Lo1(gds) (int4(gds+42) * 0.000001).

#define GDS_Lambert_Lov(gds) (int4(gds+51) * 0.000001).

#define GDS_LatLon_basic_ang(gds) int4(gds+38).

#define GDS_LatLon_dlat(gds) int4(gds+67).

#define GDS_LatLon_dlon(gds) int4(gds+63).

#define GDS_LatLon_lat1(gds) int4(gds+46).

#define GDS_LatLon_lat2(gds) int4(gds+55).

#define GDS_LatLon_lon1(gds) uint4(gds+50).

#define GDS_LatLon_lon2(gds) uint4(gds+59).

#define GDS_LatLon_sub_ang(gds) int4(gds+42).

#define GDS_Mercator_dx(gds) ((uint4(gds+64))*0.001).

#define GDS_Mercator_dy(gds) ((uint4(gds+68))*0.001).

#define GDS_Mercator_lat1(gds) (int4(gds+38)*0.000001).

#define GDS_Mercator_lat2(gds) (int4(gds+51)*0.000001).

#define GDS_Mercator_latD(gds) (int4(gds+47)*0.000001).

#define GDS_Mercator_lon1(gds) (uint4(gds+42)*0.000001).

#define GDS_Mercator_lon2(gds) (uint4(gds+55)*0.000001).

#define GDS_Mercator_ori_angle(gds) (uint4(gds+60)*0.000001).

#define GDS_Polar_dx(gds) (uint4(gds+55)*0.001).

#define GDS_Polar_dy(gds) (uint4(gds+59)*0.001).

#define GDS_Polar_lad(gds) (int4(gds+47)*0.000001).

#define GDS_Polar_lat1(gds) (int4(gds+38)*0.000001).

#define GDS_Polar_lon1(gds) (uint4(gds+42)*0.000001).

#define GDS_Polar_lov(gds) (uint4(gds+51)*0.000001).

#define GDS_Polar_sps(gds) ((gds[63] & 128) == 128).

#define GDS_RotLatLon_rotation(gds) (int4(gds+80)).

#define GDS_RotLatLon_sp_lat(gds) (int4(gds+72)).

#define GDS_RotLatLon_sp_lon(gds) (uint4(gds+76)).

#define GDS_Scan_row_rev(scan) ((scan & 16) == 16).

#define GDS_Scan_staggered_storage(scan) (((scan) & (1)) != 0).

#define GDS_Scan_x(scan) ((scan & 128) == 0).

#define GDS_Scan_y(scan) ((scan & 64) == 64).

#define INT1(a) ((a & 0x80) ? - (int) (a & 127) : (int) (a & 127)).

#define UINT2(a,b) ((int) ((a << 8) + (b))).

#define INT_MAX X_INT_MAX.

pi/2 */.

pi/4 */.

#define X_INT_MAX 2147483647.