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SPH for auxiliary data with N=1 DSDs
ASAR WVI Product SPH
SQ ADSRs
Wave Mode Geolocation ADS
ASAR Wave Mode Products Base SPH
Slant Range to Ground Range conversion parameters
SQ ADSRs
Measurement Data Set containing spectra. 1 MDSR per spectra.
Ocean Wave Spectra
Map Projection parameters
ASAR Image Products SPH
Measurement Data Set 1
Auxilliary Products
ASA_XCH_AX: ASAR External characterization data
ASA_XCA_AX: ASAR External calibration data
ASA_INS_AX: ASAR Instrument characterization
ASA_CON_AX: ASAR Processor Configuration
Browse Products
ASA_WS__BP: ASAR Wide Swath Browse Image
ASA_IM__BP: ASAR Image Mode Browse Image
ASA_GM__BP: ASAR Global Monitoring Mode Browse Image
ASA_AP__BP: ASAR Alternating Polarization Browse Image
Level 0 Products
ASA_WV__0P: ASAR Wave Mode Level 0
ASA_WS__0P: ASAR Wide Swath Mode Level 0
ASA_MS__0P: ASAR Level 0 Module Stepping Mode
ASA_IM__0P: ASAR Image Mode Level 0
ASA_GM__0P: ASAR Global Monitoring Mode Level 0
ASA_EC__0P: ASAR Level 0 External Characterization
ASA_APV_0P: ASAR Alternating Polarization Level 0 (Cross polar V)
ASA_APH_0P: ASAR Alternating Polarization Level 0 (Cross polar H)
ASA_APC_0P: ASAR Alternating Polarization Level 0 (Copolar)
Level 1 Products
ASA_IMS_1P: ASAR Image Mode Single Look Complex
ASA_IMP_1P: ASAR Image Mode Precision Image
ASA_IMM_1P: ASAR Image Mode Medium Resolution Image
ASA_IMG_1P: ASAR Image Mode Ellipsoid Geocoded Image
ASA_GM1_1P: ASAR Global Monitoring Mode Image
ASA_APS_1P: ASAR Alternating Polarization Mode Single Look Complex
ASA_APP_1P: ASAR Alternating Polarization Mode Precision Image
ASA_APM_1P: ASAR Alternating Polarization Medium Resolution Image product
ASA_WSS_1P: Wide Swath Mode SLC Image
ASA_WVS_1P: ASAR Wave Mode Imagette Cross Spectra
ASA_WSM_1P: ASAR Wide Swath Medium Resolution Image
ASA_APG_1P: ASAR Alternating Polarization Ellipsoid Geocoded Image
Level 2 Products
ASA_WVW_2P: ASAR Wave Mode Wave Spectra
ASAR Glossary Terms
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6.6.25 Level 0 SPH

A standard Specific Product Header (SPH) format has been defined for all ENVISAT Level 0 data. The format shown below follows the same ASCII format conventions of the Main Product Header (MPH) .

Note that the symbol " " denotes a blank space throughout this handbook.


Table 6.65 Level 0 SPH

Level 0 SPH

# Description Units Count Type Size
Data Record
0 sph_descriptor_title
SPH_DESCRIPTOR=
keyword 1 AsciiString 15 byte(s)
1 quote_1
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
2 sph_descriptor
SPH descriptor

ASCII string describing the product

ascii 1 AsciiString 28 byte(s)
3 quote_2
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
4 newline_char_1
newline character
terminator 1 AsciiString 1 byte(s)
5 start_lat_title
START_LAT=
keyword 1 AsciiString 10 byte(s)
6 start_lat
WGS84 latitude of first satellite nadir point at the sensing start time of the MPH

A negative value denotes south latitude; a positive value denotes north latitude.

(1e-6) degrees 1 AsciiGeoCoordinate 11 byte(s)
7 start_lat_units
<10-6degN>
units 1 AsciiString 10 byte(s)
8 newline_char_2
newline character
terminator 1 AsciiString 1 byte(s)
9 start_long_title
START_LONG=
keyword 1 AsciiString 11 byte(s)
10 start_long
WGS84 longitude of first satellite nadir point at the sensing start time of the MPH

A positive value denotes east of Greenwich; a negative value denotes west of Greenwich.

(1e-6) degrees 1 AsciiGeoCoordinate 11 byte(s)
11 start_long_units
<10-6degE>
units 1 AsciiString 10 byte(s)
12 newline_char_3
newline character
terminator 1 AsciiString 1 byte(s)
13 stop_lat_title
STOP_LAT=
keyword 1 AsciiString 9 byte(s)
14 stop_lat
WGS84 latitude of first satellite nadir point at the sensing stop time of the MPH

A negative value denotes south latitude; a positive value denotes north latitude.

(1e-6) degrees 1 AsciiGeoCoordinate 11 byte(s)
15 stop_lat_units
<10-6degN>
units 1 AsciiString 10 byte(s)
16 newline_char_4
newline character
terminator 1 AsciiString 1 byte(s)
17 stop_long_title
STOP_LONG=
keyword 1 AsciiString 10 byte(s)
18 stop_long
WGS84 longitude of first satellite nadir point at the sensing stop time of the MPH

A positive value denotes east of Greenwich; a negative value denotes west of Greenwich.

(1e-6) degrees 1 AsciiGeoCoordinate 11 byte(s)
19 stop_long_units
<10-6degE>
units 1 AsciiString 10 byte(s)
20 newline_char_5
newline character
terminator 1 AsciiString 1 byte(s)
21 sat_track_title
SAT_TRACK=
keyword 1 AsciiString 10 byte(s)
22 sat_track
Sub-satellite track heading at the sensing start time in the MPH.

degrees 1 Afl 15 byte(s)
23 sat_track_units
<deg>
units 1 AsciiString 5 byte(s)
24 newline_char_6
newline character
terminator 1 AsciiString 1 byte(s)
25 spare_1
Spare
- 1 SpareField 51 byte(s)
26 isp_errors_sig_title
isp_ERRORS_SIGNIFICANT=
keyword 1 AsciiString 23 byte(s)
27 isp_errors_significant
1 or 0.1 if number of isps with CRC errors exceeds threshold
ascii 1 AsciiString 1 byte(s)
28 newline_char_8
newline character
terminator 1 AsciiString 1 byte(s)
29 missing_isps_sig_title
MISSING_ispS_SIGNIFICANT=
keyword 1 AsciiString 25 byte(s)
30 missing_isps_significant
1 or 0.1 if number of missing isps exceeds threshold
ascii 1 AsciiString 1 byte(s)
31 newline_char_9
newline character
terminator 1 AsciiString 1 byte(s)
32 isp_discard_sig_title
isp_DISCARDED_SIGNIFICANT=
keyword 1 AsciiString 26 byte(s)
33 isp_discarded_significant
1 or 0.1 if number of isps discarded by the PF-HS exceeds threshold
ascii 1 AsciiString 1 byte(s)
34 newline_char_10
newline character
terminator 1 AsciiString 1 byte(s)
35 rs_sig_title
RS_SIGNIFICANT=
keyword 1 AsciiString 15 byte(s)
36 rs_significant
1 or 0.1 if number of isps with Reed Solomon corrections exceeds threshold
ascii 1 AsciiString 1 byte(s)
37 newline_char_11
newline character
terminator 1 AsciiString 1 byte(s)
38 spare_2
Spare
- 1 SpareField 51 byte(s)
39 num_err_isps_title
NUM_ERROR_ispS=
keyword 1 AsciiString 15 byte(s)
40 num_error_isps
Number of ISPs containing CRC errors as reported by the FEP

isps 1 Al 11 byte(s)
41 newline_char_13
newline character
terminator 1 AsciiString 1 byte(s)
42 err_isp_thresh_title
ERROR_ispS_THRESH=
keyword 1 AsciiString 18 byte(s)
43 error_isps_thresh
Threshold at which number of isps containing CRC errors is considered significant
percent 1 Afl 15 byte(s)
44 err_isp_thresh_units
<%>
units 1 AsciiString 3 byte(s)
45 newline_char_14
newline character
terminator 1 AsciiString 1 byte(s)
46 num_missing_isps_title
NUM_MISSING_ispS=
keyword 1 AsciiString 17 byte(s)
47 num_missing_isps
Number of missing ISPs

isps 1 Al 11 byte(s)
48 newline_char_15
newline character
terminator 1 AsciiString 1 byte(s)
49 missing_isps_thresh_title
MISSING_ispS_THRESH=
keyword 1 AsciiString 20 byte(s)
50 missing_isps_thresh
Threshold at which number of isps missing is considered significant
percent 1 Afl 15 byte(s)
51 missing_isps_thresh_units
<%>
units 1 AsciiString 3 byte(s)
52 newline_char_16
newline character
terminator 1 AsciiString 1 byte(s)
53 num_discard_title
NUM_DISCARDED_ispS=
keyword 1 AsciiString 19 byte(s)
54 num_discarded_isps
Number of ISPs discarded by PF-HS

isps 1 Al 11 byte(s)
55 newline_char_17
newline character
terminator 1 AsciiString 1 byte(s)
56 discard_thresh_title
DISCARDED_ispS_THRESH=
keyword 1 AsciiString 22 byte(s)
57 discarded_isps_thresh
Threshold at which number of isps discarded by PF-HS is considered significant
percent 1 Afl 15 byte(s)
58 discard_thresh_units
<%>
units 1 AsciiString 3 byte(s)
59 newline_char_18
newline character
terminator 1 AsciiString 1 byte(s)
60 num_rs_title
NUM_RS_ispS=
keyword 1 AsciiString 12 byte(s)
61 num_rs_isps
Number of isps with Reed Solomon corrections
isps 1 Al 11 byte(s)
62 newline_char_19
newline character
terminator 1 AsciiString 1 byte(s)
63 rs_thresh_title
RS_THRESH=
keyword 1 AsciiString 10 byte(s)
64 rs_thresh
Threshold at which number of isps discarded by PF-HS is considered significant
percent 1 Afl 15 byte(s)
65 rs_thresh_units
<%>
units 1 AsciiString 3 byte(s)
66 newline_char_20
newline character
terminator 1 AsciiString 1 byte(s)
67 spare_3
Spare
- 1 SpareField 101 byte(s)
68 tx_polar_title
TX_RX_POLAR=
keyword 1 AsciiString 12 byte(s)
69 quote_3
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
70 tx_rx_polar
Transmitter/receiver polarization (used for ASAR only)

ØØØØØ for non-ASAR products

ascii 1 AsciiString 5 byte(s)
71 quote_4
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
72 newline_char_22
newline character
terminator 1 AsciiString 1 byte(s)
73 swath_title
SWATH=
keyword 1 AsciiString 6 byte(s)
74 quote_5
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
75 swath
Swath number (used for ASAR only)

ØØØ for non-ASAR products

ascii 1 AsciiString 3 byte(s)
76 quote_6
quotation mark ("""")
ascii 1 AsciiString 1 byte(s)
77 newline_char_23
newline character
terminator 1 AsciiString 1 byte(s)
78 spare_4
Spare
- 1 SpareField 42 byte(s)
Record Length : 836

DS_NAME : Level 0 SPH



Format Version 116.0  

Within each SPH ( and not shown by the SPH Format Table ) are the following Data Set Descriptors (DSDs) , which begin in field# 25 of the SPH.

Table 6.66
Field
Contents
Units
Byte length

Data

Type

Data Set Descriptors (DSDs)

25

DSD (M) for MDS

Contents as defined in the table " General DSD Format " found in the " Definitions and Conventions " section

280

dsd

1

26

DSD (R) pointing to Configuration file

Contents as defined in the table " General DSD Format " found in the " Definitions and Conventions " section

280

dsd

1

27

DSD (R) pointing to the Orbit State Vector file used

280

dsd

1

28

DSD - Spare (279 blank space characters followed by 1 newline character)

280

dsd_sp

1

Total
1956












Level 0 DSD Format

There will be 4 DSDs in the Level 0 SPH. The first DSD describes the Measurement Data Set (the Instrument Source Packets ) the second is a reference DSD which contains the name of the Level 0 Processor Configuration File used to create the product, and the third is a reference DSD which contains the name of the Orbit State Vector file used to create the product. Finally, the fourth is a spare DSD, reserved to allow future additions to the product if needed. A general DSD structure has been defined as in --broken link-- the table " General DSD Format " found in the " Definitions and Conventions " section. The fields of the Level 0 DSD are filled as follows:

DSD for the MDS:

DS_NAME= " ASAR_SOURCE_PACKETS "

DS_TYPE =M

FILENAME= "
"

DS_OFFSET= (MPH length + SPH length including DSDs) < bytes >

DS_SIZE= (data dependent) < bytes >

NUM_DSR=(data dependent)

DSR_SIZE=(data dependent, set to -1 if size is variable) < bytes >

DSD Referencing the Level 0 Config. file, or the Orbit State Vector file:

DS_NAME= " LEVEL_0_CONFIGURATION_FILE " or " ORBIT_STATE_VECTOR_FILE "

DS_TYPE=R

FILENAME= " (filename) " { note: the filename is left justified within the quotation marks, with any blank spaces added before the closing quote }

DS_OFFSET=+00000000000000000000 < bytes >

DS_SIZE=+00000000000000000000 < bytes >

NUM_DSR=+0000000000

DSR_SIZE=+0000000000 < bytes >

DSD - Spare

This DSD is simply 279 ASCII blank space characters followed by 1 ASCII newline character

6.6.26 Doppler Centroid parameters

Table 6.67

Doppler Centroid Grid ADS

# Description Units Count Type Size
Data Record
0 first_zero_doppler_time
First Zero Doppler Azimuth time of raw signal data used for this estimates
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 origin (t0)
ns 100 fl 100*4 byte(s)
3 dop_coef
Fine Doppler centroid frequency estimate. This is the original estimated Doppler centroid frequncy befor any polynomial fitting is applied
Hz 100 fl 100*4 byte(s)
4 last_zero_doppler_time
Last Zero Doppler Azimuth time of raw signal data used for this estimates
MJD 1 mjd 12 byte(s)
5 spare_1
Spare
- 1 SpareField 388 byte(s)
Record Length : 1213

DS_NAME : Doppler Centroid Grid ADS



Format Version 116.0