Level 0 SPH

24-Jul-2014

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Index

Credits

ASAR Data Formats Products

Records

Geolocation Grid ADSRs

Doppler Centroid parameters

Chirp parameters

Antenna Elevation pattern

ASAR external characterization data

ASAR external calibration data

Level 0 SPH

Level 0 MDSR

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

Sea Ice Glossary

Land Glossary

Oceans Glossary

Geometry Glossary

ASAR Instrument Glossary

Acronyms and Abbreviations

ASAR Frequently Asked Questions

The ASAR Instrument

Instrument Characteristics and Performance

Inflight Performance Verification

Preflight Characteristics and Expected Performance

Instrument Description

Internal Data Flow

ASAR Instrument Functionality

Payload Description and Position on the Platform

ASAR Products and Algorithms

Auxiliary Products

Common Auxiliary Data Sets

Auxiliary Data Sets for Level 1B Processing

Summary of Auxiliary Data Sets

Instrument-specific Topics

Level 2 Product and Algorithms

Level 2 Product

ASAR Level 2 Algorithms

Level 1B Products

Descalloping

Range-Doppler

ASAR Level 0 Products

Level 0 Instrument Source Packet Description

Product Evolution History

Definitions and Conventions

Conventions

Organisation of Products

ASAR Data Handling Cookbook

Hints and Algorithms for Higher Level Processing

Hints and Algorithms for Data Use

ASAR Characterisation and Calibration

References

Notes

The Derivation of Backscattering Coefficients and RCSs in ASAR Products

External Characterisation

Internal Calibration

Pre-flight Characterisation Measurements

ASAR Latency Throughput and Data Volume

Data Volume

Throughput

Latency

Products and Algorithms Introduction

Child Products

The ASAR User Guide

Image Gallery

Further Reading

How to Use ASAR Data

Software Tools

How to Choose ASAR Data

Special Features of ASAR

Geophysical Coverage

Principles of Measurement

Scientific Background

Geophysical Measurements

ASAR Product Handbook

ASAR instrument characterization data

Wave Mode processing parameters

ASAR processor configuration data

Main Processing parameters

ASA_WVI_1P: ASAR Wave Mode SLC Imagette and Imagette Cross Spectra

Product Terms

RADAR and SAR Glossary

Level 1B Products

Summary of Applications vs Products

Services

Site Map

Frequently asked questions

Glossary

Credits

Search
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Index | Previous | Next

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

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6.6.25 Level 0 SPH

Table 6.65 Level 0 SPH

Level 0 SPH

DS_NAME : Level 0 SPH

Table 6.66

Total

1956

Level 0 DSD Format

DSD for the MDS:

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

6.6.26 Doppler Centroid parameters

Table 6.67

Doppler Centroid Grid ADS

DS_NAME : Doppler Centroid Grid ADS