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6.6.13 Map Projection parameters

If geocoding of the data set is performed (i.e., data is resampled to a map projection ), a GADS containing all necessary information to describe the map projection used is included. Geocoding is only performed for stand-alone products .

The PF-ASAR processor supports 6 map projections:

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.


Table 6.50 Map Projection parameters

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