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1. Universal Transverse Mercator (UTM)
2. Universal Polar Stereographic (UPS)
3. Lambert Conformal Conic (LCC)
4. Transverse Mercator (TM)
5. Mercator (MERC)
6. Polar Stereographic (PS)

Therefore, the values given for the map descriptor in Field# 1, in the layout for the ASAR_Map_GADS that is provided below, will be one of the following:

1. UNIVERSAL_TRANSVERSE_MERCATOR
2. UNIVERSAL_POLAR_STEREOGRAPHIC
3. LAMBERT_CONFORMAL_CONIC
4. TRANSVERSE_MERCATOR
5. MERCATOR
6. POLAR_STEREOGRAPHIC

where the symbol " " denotes a blank space.

Map Projection parameters

#	Description	Units	Count	Type	Size
Data Record
0	map_descriptor Map projection descriptor.	ascii	1	AsciiString	32 byte(s)
1	samples Number of samples per line	-	1	ul	4 byte(s)
2	lines Number of lines	-	1	ul	4 byte(s)
3	sample_spacing Nominal inter-sample distance	m	1	fl	4 byte(s)
4	line_spacing Nominal inter-line distance	m	1	fl	4 byte(s)
5	orientation Output scene centre orientation	deg	1	fl	4 byte(s)
6	spare_1 Spare	-	1	SpareField	40 byte(s)
7	heading Platform heading, degrees	deg	1	fl	4 byte(s)
8	ellipsoid_name Reference ellipsoid name	ascii	1	AsciiString	32 byte(s)
9	semi_major Ellipsoid semi-major axis, metres	m	1	fl	4 byte(s)
10	semi_minor Ellipsoid semi-minor axis, metres	m	1	fl	4 byte(s)
11	shift_dx Datum shift parameter referenced to Greenwich: dx (metres)	m	1	fl	4 byte(s)
12	shift_dy Datum shift parameter perpendicular to Greenwich: dy (metres)	m	1	fl	4 byte(s)
13	shift_dz Datum shift parameter direction of the rotation axis: dz (metres)	m	1	fl	4 byte(s)
14	avg_height Average scene height above ellipsoid used for geocoding	-	1	fl	4 byte(s)
15	spare_2 Spare	-	1	SpareField	12 byte(s)
16	projection_description Map projection alphanumeric description	ascii	1	AsciiString	32 byte(s)
17	utm_descriptor UTM descriptor UNIVERSAL_TRANSVERSE_MERCATOR������	ascii	1	AsciiString	32 byte(s)
18	utm_zone UTM zone signature	ascii	1	AsciiString	4 byte(s)
19	utm_origin_easting Map origin, false easting	m	1	fl	4 byte(s)
20	utm_origin_northing Map origin, false northing	m	1	fl	4 byte(s)
21	utm_center_long Projection centre longitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
22	utm_center_lat Projection centre latitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
23	utm_para1 1st standard parallel, deg	deg	1	fl	4 byte(s)
24	utm_para2 2nd standard parallel, deg	deg	1	fl	4 byte(s)
25	utm_scale Scale factor	-	1	fl	4 byte(s)
26	ups_descriptor UPS descriptor UNIVERSAL_POLAR_STEREOGRAPHIC������	ascii	1	AsciiString	32 byte(s)
27	ups_center_long Projection centre longitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
28	ups_center_lat Projection centre latitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
29	ups_scale Scale factor	-	1	fl	4 byte(s)
30	nsp_descriptor NSP descriptor One of: LAMBERT_CONFORMAL_CONIC������������������, TRANSVERSE_MERCATOR��������������������������, MERCATOR������������������������������������������������, POLAR_STEREOGRAPHIC��������������������������	ascii	1	AsciiString	32 byte(s)
31	origin_easting Map origin, false easting	m	1	fl	4 byte(s)
32	origin_northing Map origin, false northing	m	1	fl	4 byte(s)
33	center_long Projection centre longitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
34	center_lat Projection centre latitude, deg	(1e-6) degrees	1	GeoCoordinate	4 byte(s)
35	standard_parallel_parameters Standard Parallel parameters	-	1	standard_parallel_parametersStruct	16.0 byte(s)
	a para1 Latitude of first standard parallel (for Lambert Conformal Conic projection only, otherwise zero). deg 1 fl 4 byte(s) b para2 Latitude of second standard parallel (for Lambert Conformal Conic projection only, otherwise zero). deg 1 fl 4 byte(s) c spare_3 Spare - 1 SpareField 8 byte(s)
36	central_meridian_parameters Central meridian parameters	-	1	central_meridian_parametersStruct	12.0 byte(s)
	a central_m1 Longitude of the central meridian (or for Polar Stereographic projection Longitude down below pole of map). deg 1 fl 4 byte(s) b spare_4 Spare - 1 SpareField 8 byte(s)
37	projection_parameters Projection dependent parameters	-	1	projection_parametersStruct	16.0 byte(s)
	a proj1 Scale factor at central meridian (for Transverse Mercator projection only, otherwise zero). - 1 fl 4 byte(s) b spare_5 Spare - 1 SpareField 12 byte(s)
38	position_northings_eastings Positioning Information in Northings and Eastings	-	1	position_northings_eastingsStruct	32.0 byte(s)
	a tl_northing Top left corner northing, meters; m 1 fl 4 byte(s) b tl_easting Top left corner easting, meters; m 1 fl 4 byte(s) c tr_northing Top right corner northing, meters; m 1 fl 4 byte(s) d tr_easting Top right corner easting, meters; m 1 fl 4 byte(s) e br_northing Bottom right corner northing, meters; m 1 fl 4 byte(s) f br_easting Bottom right corner easting, meters; m 1 fl 4 byte(s) g bl_northing Bottom left corner northing, meters; m 1 fl 4 byte(s) h bl_easting Bottom left corner easting, meters; m 1 fl 4 byte(s)
39	position_lat_long Positioning Information in Latitude Longitude	-	1	position_lat_longStruct	32.0 byte(s)
	a tl_lat Top left corner latitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) b tl_long Top left corner longitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) c tr_lat Top right corner latitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) d tr_long Top right corner longitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) e br_lat Bottom right corner latitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) f br_long Bottom right corner longitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) g bl_lat Bottom left corner latitude (1e-6) degrees 1 GeoCoordinate 4 byte(s) h bl_long Bottom left corner longitude (1e-6) degrees 1 GeoCoordinate 4 byte(s)
40	spare_6 Spare	-	1	SpareField	32 byte(s)
41	image_to_map_coefs 8 coefficients to convert a line(L) and sample (S) position to the map projection frame of reference, say (E,N)E = A11 + A12*L + A13 *S + A14 *L*SN = A21 + A22*L + A23 *S + A24 *L*S	-	8	fl	8*4 byte(s)
42	map_to_image_coefs 8 coefficients to convert from the map projection (E,N) to line (L) and sample(S) position in the imageL = B11 + B12*E + B13 *N + B14 *E*NS = B21 + B22*E + B23 *N + B24 *E*N	-	8	fl	8*4 byte(s)
43	spare_7 Spare	-	1	SpareField	35 byte(s)

Record Length : 591

DS_NAME : Map Projection parameters

Format Version 114.0  

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