esa envisat sheet : doc. no: issue : date : 18 december 1997 · doc. no:po-tn-esa-gs-00701 issue :1...

esaENVISAT-1

Doc. No:PO-TN-ESA-GS-00701Issue :1 . 0Date : 18 December 1997Sheet : 1 / 21ENVISAT

1 ASAR

ENVISAT-1 PRODUCT SUMMARY OVERVIEW

1.1 ASAR Product Summary Table

ASARProcessing

LevelImage

AlternatingPolarization Wide Swath

GlobalMonitoring

Wave

L 0 level0

stripe sizeCoverage

ASA_IM__0P

22500 Mbytes100Km/12000Km

(30’)

ASA_APC_0PASA_APH_0PASA_APV_0P

22500 Mbytes100Km/12000Km

(30’)

ASA_WS__0P

22500 Mbytes400Km/

12000Km(30’)

ASA_GM__0P

675Mb400Km/

40000Km(1 orbit)

ASA_WV__0P

608 Mb400*5Km*5Km

(1 orbit)

Browse Browsestripe sizeCoverage:

ASA_IM__BP3 Mbytes

100Km/4000Km

ASA_AP__BP3 Mbytes

100Km/4000Km

ASA_WS__BP3 Mbytes

400Km/4000Km

ASA_GM__BP18 Mbytes400Km/

40000Km

L 1b Med. Res.Imagesize sceneCoverage:

ASA_IMM_1P

4 Mbytes100Km/100Km

ASA_APM_1P

4 Mbytes100Km/100Km

ASA_WSM_1P

59 Mbytes400Km*400Km

L 1b Glob.Mon. Imagesize orbitCoverage

ASA_GM1_1P

146 Mb400Km/

40000Km

L 1b SLCsize sceneCoverage

ASA_IMS_1P741 Mbper scene100Km/100Km

ASA_APS_1P1481 Mb per scene

100Km/100Km

L 1b PRIsize sceneCoverage

ASA_IMP_1P134 Mb per scene100Km/100Km

ASA_APP_1P268 Mb per scene100Km/100Km

L 1b GECsize sceneCoverage

ASA_IMG_1P282 Mb

100Km/100Km

ASA_APG_1P563 Mb

100Km/100Km

L 1b Spectra& SLCImagettesizeCoverage

ASA_WVI_1P120 Mbytes(20 imagettes)5Km*5Km

L 1b ImageSpectrasize

ASA_ WVS_1P0.2 Mbytes(20 spectra)

L 2 Wavespectrasize

ASA_WVW_2P0.2 Mbytes(20 spectra)

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1.2 ASAR Product Spreadsheets

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)

DATASET MPH + SPH + MDSMDS containing annotated ISP(1) sample = 4 bits I, 4 bits Q (compressed)

AUXILIARYDATA

Orbit data and time correlation parameters,PCD are included.

(Noise Measurements, Calibration Pulses P1,P1a,P2,P3Header content of Source Packet)

NOTES 1. Data uncompression is the first step to level1 processing

esaENVISAT-1


PRODUCT ID ASA_APH__0P

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wath.


ASA_APV__0P

ASA_APC__0P

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)


AUXILIARYDATA

Orbit data and time correlation parameters, PCD are included.


NOTES 1. Data uncompression is the first step to level 1 processing

esaENVISAT-1


PRODUCT ID ASA_WS__0P

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NAME ASAR Wide Swath Mode source packets level 0

DESCRIPTION ASAR Level 0 wide swath 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 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)


AUXILIARYDATA

Orbit data and time correlation parameters, PCD are included.

(Noise Measurements, Calibration Pulses P1, P1a, P2, P3Header content of Source Packet)

NOTES 1. Data uncompression is the first step to level1 processing

esaENVISAT-1


PRODUCT ID ASA_IMP_1P

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ADS,DS,


NAME ASAR image mode Precision Image

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.

esaENVISAT-1


PRODUCT ID ASA_IMS_1P

H orali-

ADS,tion

RF.


NAME ASAR image single look complex

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.


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


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)

esaENVISAT-1


PRODUCT ID ASA_IMG_1P

agea map

ADS,DS,

pond-


NAME ASAR image mode ellipsoid geocoded image

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)


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




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.

esaENVISAT-1


PRODUCT ID ASA_APP_1P

lter-

com-

ADS,DS,

km)


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



Product ENL > 1.8

PIXEL SPACING 12.5 m X 12.5 m


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




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.

esaENVISAT-1


PRODUCT ID ASA_APG_1P

lter-ct is

com-

ADS,DS,

pond-


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.


COVERAGE 100km X 100 km

GEOMETRICRESOLUTION



Product ENL > 1.8

PIXEL SPACING 12.5 m X 12.5 m (grid easting and northing)


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




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.

esaENVISAT-1


PRODUCT ID ASA_APS_1P

col-s). It berod-

com-

ADS,tion

RF.


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.


COVERAGE 100 km along track, 56- 100 km across track

GEOMETRICRESOLUTION

approximately TBD azimuth, TBD slant range.


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



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.

esaENVISAT-1


PRODUCT ID ASA_WSM_1P

ideefini-

ADS,DS,


NAME ASAR wide swath standard image

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


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




NOTES

esaENVISAT-1


PRODUCT ID ASA_IMM_1P

agee

ADS,DS,


NAME ASAR image mode medium resolution image

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



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




NOTES 1. The products cover a continuous area along the imaging swath.

esaENVISAT-1


PRODUCT ID ASA_APM_1P

lter- radi-

ation

ADS,DS,


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



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




NOTES 1. The products cover a continuous area along the imaging swath.

2 The images from the two polarisation channels are coregistred.

esaENVISAT-1


PRODUCT ID ASA_WV__0P

ages

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data


NAME ASAR wave mode Low rate level 0

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


NOTES (1) product size derived from IS7 (reference PO-LI-MMS-SR-0002 Instrument list) =1.52 Mbyte (TBC)

up to 400 imagettes/products

esaENVISAT-1


PRODUCT ID ASA_WVI_1P

ave

rod-

art of

es I/ 2

ADS,

RF.


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)


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)

esaENVISAT-1


PRODUCT ID ASA_WVS_1P

cte us-

art of

ytes

ADS,


NAME ASAR Wave Mode Imagette Cross Spectra

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

esaENVISAT-1


PRODUCT ID ASAR_GM__0P

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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

RESOLUTION N/A

ACCURACY N/ A

SIZE max 675 Mbytes /orbit


AUXILIARYDATA

Orbit data and time correlation parameters

PCDs


NOTES

esaENVISAT-1


PRODUCT ID ASA_GM1_1P

lobal

ADS,DS,

n im-


NAME ASAR Global Monitoring Mode Image

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


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



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

esaENVISAT-1


PRODUCT ID ASA_GM__BP

al

for


NAME ASAR Global monitoring mode browse

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


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


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



esaENVISAT-1


PRODUCT ID ASA_AP__BP

.

ible


NAME ASAR alternating polarization browse

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


56-100 km in across track direction


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



esaENVISAT-1


PRODUCT ID ASA_WS__BP

ct is


NAME ASAR wide swath browse

DESCRIPTION ASAR product generated when the instrument is in wide swath mode. The produfor browse purpose only.


405 km in across track direction


Product ENL ~ 30 to 48 (TBC)

PIXEL SPACING 900 m x 900m for WS

SIZE stripline max 3Mbytes

DATASET each product containing:(1) header(2) 4445 data records(3) 500 samples/record(4) 1 byte/sample

AUXILIARYDATA


NOTES (1) The products cover a continuous area along the imaging swath.

esa envisat sheet : doc. no: issue : date : 18 december 1997 · doc. no:po-tn-esa-gs-00701 issue :1...

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