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6.6.19 Wave Mode Geolocation ADS
Due to the reduced size of the imagettes compared to normal
ASAR images, each Wave Mode
Geolocation Annotation
Data Set Record (ADSR) contains only the
geodetic latitude and longitude of the centre point
of the imagette. One ADSR is produced for each
wave cell.
The centre point given in the Geolocation ADSR
corresponds to the ground range centre
point of the wave cell. This will not correspond
exactly to the latitude and longitude of the
centre sample of the SLC imagette (in slant range ), but
provides a
more accurate positioning
of the location of the cross spectra centre point.
Note that the imagettes do not cover a contiguous
region geographically. Thus, Wave Mode
Geolocation ADS entries may differ
substantially for different imagettes.
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Table 6.57 Wave Mode Geolocation ADS
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Wave Mode Geolocation ADS
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#
|
Description
|
Units
|
Count
|
Type
|
Size
|
|
Data Record
|
|
0
|
zero_doppler_time
Zero Doppler Time
of first line of the first line
of the imagette |
MJD |
1 |
mjd |
12 byte(s) |
|
1
|
attach_flag
Attachment Flag
Set to 1 if unable to
compute the cross spectra
for a given SLC imagette
(I.e. no Cross Spectra MDSR
corresponding to this ADSR),
set to 0 otherwise.
|
flag |
1 |
BooleanFlag |
1 byte(s) |
|
2
|
center_lat
Geodetic
latitude of center point
(positive north)
This is the center point
of the wave cell.
|
(1e-6) degrees |
1 |
GeoCoordinate |
4 byte(s) |
|
3
|
center_long
Geodetic
longitude of center point
(positive east)
This is the center point
of the wave cell.
|
(1e-6) degrees |
1 |
GeoCoordinate |
4 byte(s) |
|
4
|
heading
Subsatellite Track
Heading. Relative to North of
centre point. |
- |
1 |
fl |
4 byte(s) |
DS_NAME : Wave Mode Geolocation ADS
Format Version 114.0
Note for both fields # 3 and #4, the
centre point of the wave cell is calculated after
the cross spectra processing, and thus may differ
from the centre sample latitude of the SLC imagette
if slant range to ground range conversion was
performed during the cross spectra calculation. |
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Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,
atmospheric chemistry
|
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