| Supported ENVISAT Products | |
Fields of ENVISAT ASAR_Map_GADS Records
| Index | Identifier | Field Type | Field Length | Description | Units |
| 0 | "map_descriptor" |
String | 1 | Map projection descriptor one of: UNIVERSAL_TRANSVERSE_MERCATOR, UNIVERSAL_POLAR_STEREOGRAPHIC, LAMBERT_CONFORMAL_CONIC, TRANSVERSE_MERCATOR, MERCATOR, POLAR_STEREOGRAPHIC |
ascii |
| 1 | "samples" |
ULong | 1 | Number of samples per line | - |
| 2 | "lines" |
ULong | 1 | Number of lines | - |
| 3 | "sample_spacing" |
Float | 1 | Nominal inter-sample distance | m |
| 4 | "line_spacing" |
Float | 1 | Nominal inter-line distance | m |
| 5 | "orientation" |
Float | 1 | Output scene centre orientation | deg |
| 6 | "spare_1" |
Spare | 1 | Spare | - |
| 7 | "heading" |
Float | 1 | Platform heading, degrees | deg |
| 8 | "ellipsoid_name" |
String | 1 | Reference ellipsoid name | ascii |
| 9 | "semi_major" |
Float | 1 | Ellipsoid semi-major axis, metres | m |
| 10 | "semi_minor" |
Float | 1 | Ellipsoid semi-minor axis, metres | m |
| 11 | "shift_dx" |
Float | 1 | Datum shift parameter referenced to Greenwich: dx (metres) | m |
| 12 | "shift_dy" |
Float | 1 | Datum shift parameter perpendicular to Greenwich: dy (metres) | m |
| 13 | "shift_dz" |
Float | 1 | Datum shift parameter direction of the rotation axis: dz (metres) | m |
| 14 | "avg_height" |
Float | 1 | average scene height above ellipsoid used for geocoding | - |
| 15 | "spare_2" |
Spare | 1 | Spare | - |
| 16 | "projection_description" |
String | 1 | Map projection alphanumeric description | ascii |
| 17 | "utm_descriptor" |
String | 1 | UTM descriptorUNIVERSAL_TRANSVERSE_MERCATORØØØ | ascii |
| 18 | "utm_zone" |
String | 1 | UTM zone signature | ascii |
| 19 | "utm_origin_easting" |
Float | 1 | Map origin, false easting | m |
| 20 | "utm_origin_northing" |
Float | 1 | Map origin, false northing | m |
| 21 | "utm_center_long" |
SLong | 1 | Projection centre longitude, deg | (1e-6) degrees |
| 22 | "utm_center_lat" |
SLong | 1 | Projection centre latitude, deg | (1e-6) degrees |
| 23 | "utm_para1" |
Float | 1 | 1st standard parallel, deg | deg |
| 24 | "utm_para2" |
Float | 1 | 2nd standard parallel, deg | deg |
| 25 | "utm_scale" |
Float | 1 | Scale factor | - |
| 26 | "ups_descriptor" |
String | 1 | UPS descriptor | ascii |
| 27 | "ups_center_long" |
SLong | 1 | Projection centre longitude, deg | (1e-6) degrees |
| 28 | "ups_center_lat" |
SLong | 1 | Projection centre latitude, deg | (1e-6) degrees |
| 29 | "ups_scale" |
Float | 1 | Scale factor | - |
| 30 | "nsp_descriptor" |
String | 1 | NSP descriptor | ascii |
| 31 | "origin_easting" |
Float | 1 | Map origin, false easting | m |
| 32 | "origin_northing" |
Float | 1 | Map origin, false northing | m |
| 33 | "center_long" |
SLong | 1 | Projection centre longitude, deg | (1e-6) degrees |
| 34 | "center_lat" |
SLong | 1 | Projection centre latitude, deg | (1e-6) degrees |
| 35 | "standard_parallel_parameters.para1" |
Float | 1 | Standard parallel1, deg | deg |
| 36 | "standard_parallel_parameters.para2" |
Float | 1 | Standard parallel2, deg | deg |
| 37 | "standard_parallel_parameters.para3" |
Float | 1 | Standard parallel3, deg | deg |
| 38 | "standard_parallel_parameters.para4" |
Float | 1 | Standard parallel4, deg | deg |
| 39 | "central_meridian_parameters.central_m1" |
Float | 1 | Central meridian1, deg | deg |
| 40 | "central_meridian_parameters.central_m2" |
Float | 1 | Central meridian2, deg | deg |
| 41 | "central_meridian_parameters.central_m3" |
Float | 1 | Central meridian3, deg | deg |
| 42 | "projection_parameters.spare_3" |
Spare | 1 | Spare | - |
| 43 | "projection_parameters.spare_4" |
Spare | 1 | Spare | - |
| 44 | "projection_parameters.spare_5" |
Spare | 1 | Spare | - |
| 45 | "projection_parameters.spare_6" |
Spare | 1 | Spare | - |
| 46 | "position_northings_eastings.tl_northing" |
Float | 1 | Top left corner northing, meters; | m |
| 47 | "position_northings_eastings.tl_easting" |
Float | 1 | Top left corner easting, meters; | m |
| 48 | "position_northings_eastings.tr_northing" |
Float | 1 | Top right corner northing, meters; | m |
| 49 | "position_northings_eastings.tr_easting" |
Float | 1 | Top right corner easting, meters; | m |
| 50 | "position_northings_eastings.br_northing" |
Float | 1 | Bottom right corner northing, meters; | m |
| 51 | "position_northings_eastings.br_easting" |
Float | 1 | Bottom right corner easting, meters; | m |
| 52 | "position_northings_eastings.bl_northing" |
Float | 1 | Bottom left corner northing, meters; | m |
| 53 | "position_northings_eastings.bl_easting" |
Float | 1 | Bottom left corner easting, meters; | m |
| 54 | "position_lat_long.tl_lat" |
SLong | 1 | Top left corner latitude | (1e-6) degrees |
| 55 | "position_lat_long.tl_long" |
SLong | 1 | Top left corner longitude | (1e-6) degrees |
| 56 | "position_lat_long.tr_lat" |
SLong | 1 | Top right corner latitude | (1e-6) degrees |
| 57 | "position_lat_long.tr_long" |
SLong | 1 | Top right corner longitude | (1e-6) degrees |
| 58 | "position_lat_long.br_lat" |
SLong | 1 | Bottom right corner latitude | (1e-6) degrees |
| 59 | "position_lat_long.br_long" |
SLong | 1 | Bottom right corner longitude | (1e-6) degrees |
| 60 | "position_lat_long.bl_lat" |
SLong | 1 | Bottom left corner latitude | (1e-6) degrees |
| 61 | "position_lat_long.bl_long" |
SLong | 1 | Bottom left corner longitude | (1e-6) degrees |
| 62 | "spare_7" |
Spare | 1 | Spare | - |
| 63 | "image_to_map_coefs" |
Float | 8 | 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 | - |
| 64 | "map_to_image_coefs" |
Float | 8 | 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 | - |
| 65 | "spare_8" |
Spare | 1 | Spare | - |