Level 0 SPH

14-Feb-2012

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Level 0 SPH

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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

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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

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