Supported ENVISAT Products |

## Geolocation Grid ADSRs

Fields of ENVISAT ASAR_Geo_Grid_ADSR Records

Index | Identifier | Field Type | Field Length | Description | Units
0 | `"first_zero_doppler_time"` | MJD | 1 | Zero Doppler Time in azimuth of first line of the granule. Gives azimuth location of grid line for first line of the granule. | MJD
1 | `"attach_flag"` | UChar | 1 | Attachment Flag (set to 1 if all MDSRs corresponding to this ADSR are blank, set to zero otherwise). | flag
2 | `"line_num"` | ULong | 1 | Range line number corresponding to the first line of the granule | -
3 | `"num_lines"` | ULong | 1 | Number of output lines in this granule | lines
4 | `"sub_sat_track"` | Float | 1 | Subsatellite track heading (relative to North) for first line of granule. This is the heading on the ground (includes Earth rotation). | deg.
5 | `"first_line_tie_points.samp_numbers"` | ULong | 11 | Range sample number. Gives the range location of the grid points. First range sample is 1, last is M. Zero filled samples are included. | -
6 | `"first_line_tie_points.slant_range_times"` | Float | 11 | 2 way slant range time to range sample | ns
7 | `"first_line_tie_points.angles"` | Float | 11 | Incidence Angle at range sample | deg.
8 | `"first_line_tie_points.lats"` | SLong | 11 | geodetic latitude (positive north) | (1e-6) degrees
9 | `"first_line_tie_points.longs"` | SLong | 11 | geodetic longitude (positive east) | (1e-6) degrees
10 | `"spare_1"` | Spare | 1 | Spare | -
11 | `"last_zero_doppler_time"` | MJD | 1 | Zero doppler time for the last line of the granule | MJD
12 | `"last_line_tie_points.samp_numbers"` | ULong | 11 | Range sample number. Gives the range location of the grid points. First range sample is 1, last is M. | -
13 | `"last_line_tie_points.slant_range_times"` | Float | 11 | 2 way slant range time to range sample | ns
14 | `"last_line_tie_points.angles"` | Float | 11 | Incidence Angle at range sample | deg.
15 | `"last_line_tie_points.lats"` | SLong | 11 | geodetic latitude (positive north) | (1e-6) degrees
16 | `"last_line_tie_points.longs"` | SLong | 11 | geodetic longitude (positive east) | (1e-6) degrees
17 | `"spare_2"` | Spare | 1 | Spare | -