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6.6.17 Slant Range to Ground Range conversion parameters The Slant Range-to-Ground Range
(SR/GR) conversion
coefficients may be updated more
than once per product (or slice ). Each update is time
stamped with the zero Doppler time to which the
update applies. For stripline products, the updates
occur once for each granule . The SR/GR coefficients
used on range lines between two
updates are found by linear interpolation between
the updated and previous values. The contents of
each update (each update is a single ADSR within the
ADS ) are as follows. This ADS
is not included for SLC products for which SR/GR
conversion is not performed, or for Geocoded products.
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Table 6.54 Slant Range to Ground Range conversion parameters
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Slant Range to Ground Range
conversion parameters
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#
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Description
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Units
|
Count
|
Type
|
Size
|
|
Data Record
|
|
0
|
zero_doppler_time
Zero Doppler Time
in azimuth from which parameters apply |
MJD |
1 |
mjd |
12 byte(s) |
|
1
|
attach_flag
Attachment Flag
Always set to zero for
this ADSR
|
flag |
1 |
BooleanFlag |
1 byte(s) |
|
2
|
slant_range_time
2 way slant range
time to first range sample |
ns |
1 |
fl |
4 byte(s) |
|
3
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ground_range_origin
Ground range
origin of the polynomial (GR0)
Measured from the first
pixel of the line
|
m |
1 |
fl |
4 byte(s) |
|
4
|
srgr_coeff
The coefficients
S0, S1, S2, S3, and S4 of the
ground range to slant range
conversion polynomial.
Slant range = S0 +
S1(GR-GR0) + S2 (GR-GR0)2 +
S3(GR-GR0)3 + S4(GR-GR0)4,
where GR is the ground range
distance from the first
pixel of the range line.
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m, -, m-1, m-2 |
5 |
fl |
5*4 byte(s) |
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5
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spare_1
Spare |
- |
1 |
SpareField |
14 byte(s) |
DS_NAME : Slant Range to Ground Range
conversion parameters
Format Version 114.0
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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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