esa ENVISAT-1 ENVISAT-1 PRODUCT SUMMARY OVERVIEW Doc. No:PO-TN-ESA-GS-00701 Issue :1 . 0 Date : 18 December 1997 Sheet : 1 / 21 ENVISAT 1 ASAR 1.1 ASAR Product Summary Table ASAR Processing Level Image Alternating Polarization Wide Swath Global Monitoring Wave L 0 level0 stripe size Coverage ASA_IM__0P 22500 Mbytes 100Km/12000Km (30’) ASA_APC_0P ASA_APH_0P ASA_APV_0P 22500 Mbytes 100Km/12000Km (30’) ASA_WS__0P 22500 Mbytes 400Km/ 12000Km (30’) ASA_GM__0P 675Mb 400Km/ 40000Km (1 orbit) ASA_WV__0P 608 Mb 400*5Km*5Km (1 orbit) Browse Browse stripe size Coverage: ASA_IM__BP 3 Mbytes 100Km/4000Km ASA_AP__BP 3 Mbytes 100Km/4000Km ASA_WS__BP 3 Mbytes 400Km/4000Km ASA_GM__BP 18 Mbytes 400Km/ 40000Km L 1b Med. Res. Image size scene Coverage: ASA_IMM_1P 4 Mbytes 100Km/100Km ASA_APM_1P 4 Mbytes 100Km/100Km ASA_WSM_1P 59 Mbytes 400Km*400Km L 1b Glob.Mon. Image size orbit Coverage ASA_GM1_1P 146 Mb 400Km/ 40000Km L 1b SLC size scene Coverage ASA_IMS_1P 741 Mbper scene 100Km/100Km ASA_APS_1P 1481 Mb per scene 100Km/100Km L 1b PRI size scene Coverage ASA_IMP_1P 134 Mb per scene 100Km/100Km ASA_APP_1P 268 Mb per scene 100Km/100Km L 1b GEC size scene Coverage ASA_IMG_1P 282 Mb 100Km/100Km ASA_APG_1P 563 Mb 100Km/100Km L 1b Spectra & SLC Imagette size Coverage ASA_WVI_1P 120 Mbytes (20 imagettes) 5Km*5Km L 1b Image Spectra size ASA_ WVS_1P 0.2 Mbytes (20 spectra) L 2 Wave spectra size ASA_WVW_2P 0.2 Mbytes (20 spectra)
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esa ENVISAT Sheet : Doc. No: Issue : Date : 18 December 1997 · Doc. No:PO-TN-ESA-GS-00701 Issue :1 . 0 Date : 18 December 1997 ENVISAT Sheet : 7 / 21 PRODUCT ID ASA_IMG_1P NAME ASAR
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ASAR Processing Level External CharacterisationModule Stepping
L 0 level0
sizeCoverage
ASA_EC__0P
6.25 MbytesIn trasponder Visibility (data transmission in 0.5 sec.)
ASA_MS__0P
1 Mbytesnot applicable
PRODUCT ID ASA_IM__0P
NAME ASAR Image Mode source packets level 0
DESCRIPTION ASAR Level 0 data of image modeThe objective of this product is to offer Level 0 data for possible images processinother processing site.It includes some mandatory information for SAR processin
COVERAGE Image mode,: 56 - 100 km across track depending on subswath.Along track coverage depends on the requested time interval (30 min max)
RESOLUTION N/A
ACCURACY N/A
SIZE Depends on the acquired segment : 22500 Mbytes max (30’ of data)
NAME ASAR Alternating Polarisation Mode source packets level 0
DESCRIPTION ASAR Level 0 data of alternating polarization mode. Three sub-modes are existinthis mode:
• cross pol H (HH/HV= H transmit H and V received)• cross pol V(VV/VH= V transmit V and H received)• copol C (HH/VV= H and H received/V transmit and V
received)
The objective of this product is to offer Level 0 data for possible images processinother processing site.It includes mandatory information for SAR processing
COVERAGE Alternating Polarization mode: 56 - 100 km across track depending on subsAlong track coverage depends on the requested time interval.
RESOLUTION N/A
ACCURACY N/A
SIZE Depends on the acquired segment : 22500 Mbytes (30’ of data)
The objective of this product is to offer Level 0 data for possible images processinother processing site.It includes mandatory information for SAR processing
COVERAGE Wide swath mode: 406 km across track. Along track coverage depends on the reed time interval.
RESOLUTION N/A
ACCURACY N/A
SIZE Depends on the acquired segment : 22500 Mbytes (30’ of data)
DESCRIPTION This is a multi-look, ground range, digital image. Generated from Level 0 data coed when the instrument is in image mode (7 possible swaths HH or VV polarisatThe product includes slant range to ground range correction as per definition. It users wishing to perform applications-oriented analysis. It is intended for multi-temral imaging and to derive backscattering coefficients.
COVERAGE 100 km along track x 56- 100 km across track
GEOMETRICRESOLUTION
approximately 30 m ground range (except IS1) X 30m azimuth
RADIOMETRICRESOLUTION
Product ENL > 3
PIXEL SPACING 12.5 m X 12.5 m
SIZE up to 134 Mbytes
DATASET each product containing the following:(1) header MPH + SPH(2) 8000 data records(3) 8350 samples/record (size for IS1 swath)(4) 2 bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration:1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Product size in the range direction will vary function of imaging swath.2. Corrections: antenna elevation pattern, range spreading loss.
DESCRIPTION This is a single-look, complex, slant-range, digital image generated from Level 0ASAR data collected when the instrument is in image mode (7 possible swaths HVV polarisation). It is primarily intended for use in SAR quality assessment and cbration, and can be used to derive higher level products.
COVERAGE 100 km along track x 56- 100 km across track
GEOMETRICRESOLUTION
approximately 6 azimuth, programmed chirp bandwidth dependant slant range.
RADIOMETRICRESOLUTION
1 look in azimuth, 1 look in range
PIXEL SPACING natural spacing in both Slant range and Azimuth
SIZE 741 Mbytes
DATASET each product containing the following:(1) headers MPH + SPH(2) max 27 000 data records(TBC)(3) max 6850 samples/record (depending on imaging swath)(4) 4 bytes/sample (2bytes I/ 2bytes Q)
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, GeolocaGrid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Azimuth pixel spacing depends on Earth-Satellite relative velocity and actual P
2. Slant range pixel spacing is given by ASAR sampling frequency (19.208 Mhz)
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in immode. It is the geocoded version of the PRI product. The product is resampled to projection and its orientation is north up.
COVERAGE 100km X 100 km (corresponding to the input data)
RADIOMETRICRESOLUTION
Product ENL > 3
GEOMETRICRESOLUTION
approximately 30 m ground range (except IS1)X 30m azimuth
PIXEL SPACING 12.5 m X 12.5 m (grid easting and northing)
SIZE up to282 Mbytes
DATASET each product containing the following:(1) header MPH + SPH(2) max 11850 records(3) max 11850 samples/record(4) 2 bytes / sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration:1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1 Product size will vary function of imaging swath position.
2. The absolute calibration of the GEC product shall be the same as for the corresing non-geocoded PRI product.
NAME ASAR alternating polarization precision image
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in anating polarization mode (7 possible swaths).
The product contains two images corresponding to one of the three polarisation bination sub-modes (HH & VV, HH & HV, VV & VH)
COVERAGE 100 km along track, 56- 100 km across track
GEOMETRICRESOLUTION
approximately 30 m ground range (except IS1)X 30m azimuth
RADIOMETRICRESOLUTION
Product ENL > 1.8
PIXEL SPACING 12.5 m X 12.5 m
SIZE up to 268 Mbytes
DATASET each product containing the following:(1) header MPH + SPH(2) 16,000 data records (8000 for VV polarisation & 8000 for HH polarisation)(3) 8350 samples/record (depending on imaging swath)(4) 2 bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Product size in the range direction will vary function of imaging swath (56 to 100
2. The images from the two polarisation channels are coregistred.
3. Corrections: antenna elevation pattern, range spreading loss.
NAME ASAR Alternating Polarisation mode ellipsoid geocoded image
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in anating polarisation mode. It is the geocoded version of ASAR.AP.PRI. The produresampled to a map projection and its orientation is north up.
The product contains two images corresponding to one of the three polarisation bination sub-modes (HH & VV, HH & HV, VV & VH)
COVERAGE 100km X 100 km
GEOMETRICRESOLUTION
approximately 30 m ground range (except IS1)X 30m azimuth
RADIOMETRICRESOLUTION
Product ENL > 1.8
PIXEL SPACING 12.5 m X 12.5 m (grid easting and northing)
SIZE up to 563 Mbytes
DATASET (1) each product containing the following(2) header MPH + SPH(3) max 23 700 records (11850 for VV polarisation & 11850 for HH polarisation)(4) max 11850 samples/record (depending on imaging swath)(5) 2 bytes / sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration:1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Product size will vary function of imaging swath position.
2. The absolute calibration of the GEC product shall be the same as for the corresing non-geocoded PRI product.
3. The images from the two polarisation combination channels are coregistred.
NAME ASAR Alternating Polarisation mode complex image
DESCRIPTION This is a complex, slant-range, digital image generated from Level 0 ASAR datalected when the instrument is in Alternating Polarisation mode. (7 possible swathis primarily intended for use in SAR quality assessment and calibration, and canused to derive higher level products. If allowed by the instrument acquisition, this puct shall be suitable for interferometric applications.
The product contains two images corresponding to one of the three polarisation bination sub-modes (HH & VV, HH & HV, VV & VH)
COVERAGE 100 km along track, 56- 100 km across track
GEOMETRICRESOLUTION
approximately TBD azimuth, TBD slant range.
RADIOMETRICRESOLUTION
1 look in azimuth, 1 look in range
PIXEL SPACING natural spacing in both Slant range and Azimuth
SIZE max 1480 Mbytes
DATASET each product containing the following(1) headers MPH + SPH and respectively for each polarisation(2) max 27 000 data records(3) 6850 samples/record (depending on imaging swath)(4) 4 bytes/sample (2bytes I / 2bytes Q)
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, GeolocaGrid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Product size will vary function of imaging swath, satellite velocity and actual P
2. The images from the two polarisation channels are coregistered.
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in wswath mode. The product includes slant range to ground range corrections per dtion.The product covers a continuous area along the imaging swath.
COVERAGE 400 km X 400 km(approximately) for a scene
400 km x 4000 km max for a stripe
GEOMETRICRESOLUTION
approximately 150 m X 150 m
RADIOMETRICRESOLUTION
Product ENL > 11.5
PIXEL SPACING 75 m X 75 m
SIZE 59 Mbytes for a scene
584 Mbytes for a stripe
DATASET each product scene containing the following:(1) header MPH + SPH(2) 5400 data records(3) 5450 samples/record(4) 2 bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in immode. This product has lower resolution but higher radiometric resolution than thASA_IMP The product covers a continuous area along the imaging swath
COVERAGE 100 km in along track direction for a scene
up to 4000km for a stripe, 56-100 km in across track direction
GEOMETRICRESOLUTION
approximately 150 m X 150 m
RADIOMETRICRESOLUTION
Product ENL ~ 40
PIXEL SPACING 75 m X 75m
SIZE 4 Mbytes of data for a scene
152 Mbytes for a stripe
DATASET each product scene containing the following:(1) header MPH + SPH(2) 1400 data records(3) 1400samples/record(4) 2bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. The products cover a continuous area along the imaging swath.
NAME ASAR Alternating Polarization medium resolution image
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in anating polarization mode. The product has lower geometric resolution but higherometric resolution than ASA_APP
The product contains one or two images corresponding to one of the three polariscombination sub-modes (HH & VV, HH & HV, VV & VH)
COVERAGE 100 km in along track direction for a scene/
up to 4000km for a stripe, 56-100 km in across track direction
GEOMETRICRESOLUTION
approximately 150 m X 150 m
RADIOMETRICRESOLUTION
Product ENL ~ 50
PIXEL SPACING 75m X 75m
SIZE 4 Mbytes for a scene with one polarisationcombination
DATASET each product containing for each polarisation:(1) header MPH + SPH(2) 1400 data records(3) 1400 samples/record(4) 2bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. The products cover a continuous area along the imaging swath.
2 The images from the two polarisation channels are coregistred.
DESCRIPTION ASAR Level 0 source packet of wave mode.
The objective of this product is to offer Level 0 Source Packet data for possible improcessing on other processing site.It includes mandatory information for SARprocessing.
COVERAGE up to 100% of the orbit(from 6.04km x 5 km imagette in IS7 to 9.44km x 5km Imagette in IS1 dependinswath selection) every 100Km
RESOLUTION N/A
ACCURACY N/ A
SIZE max 608 Mbytes/orbit
DATASET MPH + SPH + ISPsample = 2 bits I, bits 2 Q (compressed using the FBAQ))
AUXILIARYDATA
Orbit data and time correlation parameters are included.
PCD
(Noise Measurements, Calibration Pulses P1,P1a,P2,P3Header content of Source Packet)
NOTE: The product called ASAR_WVW_2P is the level 2 product of ASAR wave modederived using the cross spectra methodology.
NAME ASAR Wave Mode SLC imagette and Imagette Cross Spectra
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in wmode. The product is the basic level 1B product of ASAR wave mode.
The information is retained in complex form to allow derivation of Cross spectra. Puct containing up to 20 imagettes and associated imagettes cross spectra.
COVERAGE one product per 20 imagettes with imagette of 5 kmx5km (min.) every 100 km
GEOMETRICRESOLUTION
natural spacing slant range and azimuth azimuth
wavelength range from 20 to 1000m in 24 logarithmic steps
direction 0-360 degrees in 10 degree steps (only half real part and imaginary pspectra in product)
RADIOMETRICRESOLUTION
1 look in azimuth, 1 look in range for the SLC imagette
PIXEL SPACING natural pixel spacing in range and azimuth note 1-2
SIZE max 120 Mbytes (20 imagettes and spectra)
DATASET MPH + SPH+ Data Set Record A20 Polar Spectrum (18 bins in direction x 24 bins in wavelengthx2bytes per bin)+ Data Set Record B1 imagette max 1350 data records x 1100 samples/record x 4bytes/sample(2 bytbytes Q)
AUXILARYDATA
Orbit state vector . Time correlation parameters. Wave Processing parametersWave Geolocation ADS, SQ ADS
NOTES 1 Azimuth pixel spacing depends on Earth-Satellite relative velocity and actual P
2 Slant range pixel spacing is given by ASAR sampling frequency (19.208 Mhz)
DESCRIPTION ASAR Cross Spectra extracted from the combined SLC and Cross Specta produASA_WVI_1P generated from data collected when the instrument is in wave moding the Cross Spectra methodology.
The Product is for Meteo users.
COVERAGE up to 20 spectra acquired every 100 km,
product coverage 5kmx5km minimum
GEOMETRICRESOLUTION
wavelength range from 20 to 1000m in 24 logarithmic steps
direction 0-360 degrees in 10 degree steps (only half real part and imaginary pspectra in product)
PIXEL SPACING N/A
SIZE max 0.2 Mbytes
DATASET MPH + SPH20 Polar Spectrum (18 bins in direction (10deg. steps)x24 bins in wavelengthx2bper bin)
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Wave Processing parametersWave Geolocation ADS, SQ ADS
NAME ASAR Global Monitoring Mode low rate Source Packet level 0
DESCRIPTION ASAR Level 0 product annotated Instrument Source Packet collected while the inment is in Global Monitoring Mode.
The objective of this product is to offer Level 0 data for possible images processinother processing site.It includes mandatory information for SAR processing.
COVERAGE up to 100% of the orbit= 40 000 km x 400 km swath
DESCRIPTION ASAR product generated from Level 0 data collected when the instrument is in gmonitoring mode. The product includes slant range to ground range correction.
COVERAGE up to 40000 km(1 orbit) X 400 km(approximately)
GEOMETRICRESOLUTION
1 km x 1 km
RADIOMETRICRESOLUTION
Product ENL ~ 7-9
PIXEL SPACING 500m x 500m
SIZE up to 146 Mbytes /orbit
extracted scene 2Mbytes
DATASET each product containing the following:(1) header MPH + SPH(2) (up to 80000) data records,(3) 850 samples/record (TBC)(4) 2 bytes/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. Main Processing parametersDoppler Centroid ADS, Chirp ADS, Antenna Elevation Pattern ADS, SR/GR AGeolocation Grid ADS, SQ ADS
INTERNAL CALIBRATION
For the purpose of calibration1. Data I/Q correction (bias removal on both I and Q channels, I/Q channels gaibalance correction, I/Q non orthogonality correction)2. Replica construction3. Calibration pulse processing4. Elevation gain function calculation5. Noise power estimation
NOTES 1. Stripline Processing one product covers a full orbit
DESCRIPTION ASAR product generated from the ASA_GM1_1P when the instrument is in GlobMonitoring mode. The product is for browse purpose only.
COVERAGE 405 km in across track direction
product stripe up to 40000 km for GM
PIXEL SPACING 1000 m x 1000m for GM
RADIOMETRICRESOLUTION
Product ENL ~ 11 -15
SIZE Stripline max 18 Mbytes
DATASET each containing:(1) header(2) 40000 data records(3) 410 samples/record(4) 1 byte/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. SQADS. Geolocation Grid ADS
NOTES The products cover a continuous area along the imaging swath.
PRODUCT ID ASA_IM__BP
NAME ASAR image mode browse
DESCRIPTION ASAR product generated when the instrument is in image mode. The product is browse purpose only.The product is generated from ASA_IMM product.
COVERAGE product stripe up to 4000 km
56-100 km in across track direction
RADIOMETRICRESOLUTION
Product ENL ~ 80
PIXEL SPACING 225 m x 225m (multiple of ASA_IMM pixel spacing)
SIZE stripline max 3Mbytes
DATASET each scene containing:(1) header(2) 8889data records(3) 480 samples/record(4) 1 byte/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. SQADS. Geolocation Grid ADS
NOTES The products cover a continuous area along the imaging swath.
DESCRIPTION ASAR product generated when the instrument is in alternating polarisation modeThe product is for browse purpose only.The product is generated from ASA_APM product. It contains one of the two posspolarisation combination generated in AP mode
COVERAGE product stripe up to 4000 km
56-100 km in across track direction
RADIOMETRICRESOLUTION
Product ENL ~ 75
PIXEL SPACING 225 m x 225 m (multiple of ASA_APM pixel spacing)
SIZE stripline max 3 Mbytes
DATASET each scene containing:(1) header(2) 8889data records(3) 480 samples/record(4) 1 byte/sample
AUXILIARYDATA
Orbit state vector . Time correlation parameters. SQADS. Geolocation Grid ADS
NOTES The products cover a continuous area along the imaging swath.