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ASAR Product Handbook
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Abstract
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The ASAR User Guide
1.1 How to Choose ASAR Data
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1.1.1 Geophysical Measurements
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1.1.2 Scientific Background
1.1.2.1 Radar Imaging
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1.1.2.1.1 Polarisation
1.1.2.1.2 Backscatter
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1.1.2.2 Real Aperture Radar (RAR)
1.1.2.2.1 Spatial Resolution
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1.1.2.2.2 Range Resolution
1.1.2.2.3 Azimuth Resolution
1.1.2.3 Synthetic Aperture Radar (SAR)
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1.1.2.4 Image Interpretation
1.1.2.4.1 Geometric Characteristics
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1.1.2.4.2 Electrical Characteristics
1.1.2.4.3 Responses of Soil, Vegetation, Mountains, Water and Ice
1.1.2.4.3.1 Soil
1.1.2.4.3.2 Vegetation
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1.1.2.4.3.3 Mountains
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1.1.2.4.3.4 Water and Ice
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1.1.2.5 General Rules for SAR Image Interpretation
1.1.2.6 References
1.1.3 Principles of Measurement
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1.1.4 Geophysical Coverage
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1.1.5 Special Features of ASAR
1.1.5.1 Dual Polarisation
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1.1.5.2 Selectable Incidence Angles
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1.1.5.3 Wide Area Coverage and Frequency of Coverage
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1.1.5.4 Interferometry
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1.1.5.4.1 Principles
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1.1.5.4.2 Across-track Interferometry (InSAR)
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1.1.5.4.3 Along-track Interferometry
1.1.5.4.4 Differential Interferometry (D-InSAR)
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1.1.5.4.5 Coherence Evaluation
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1.1.5.4.6 Low Resolution Interferometry
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1.1.5.4.7 Conclusions
1.1.5.4.8 References
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1.1.5.5 Wave Spectra
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1.1.5.6 Simultaneous Observations
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1.1.6 Summary of Applications vs Products
1.1.6.1 Summary of Applications Introduction
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1.1.6.1.1 Remote Sensing Science
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1.1.6.1.2 Earth Science
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1.1.6.1.3 Commercial Applications
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1.1.6.2 Ocean Applications
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1.1.6.2.2 Ocean Fronts
1.1.6.2.3 Coastal Dynamics
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1.1.6.2.4 Oil Slicks and ShipTraffic
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1.1.6.3 Land Applications
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1.1.6.3.1 Global Vegetation Monitoring
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1.1.6.3.2 Forestry
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1.1.6.3.3 Geology and Topography
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1.1.6.3.4 Agriculture
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1.1.6.3.5 Natural Hazards
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1.1.6.3.6 Flooding, Hydrology and Water Management
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1.1.6.3.7 Urban Studies
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1.1.6.3.8 References
1.1.6.4 Sea Ice Applications
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1.1.6.4.1 Sea Ice Applications - Ice Sheet Dynamics
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1.1.6.4.3 Sea Ice Applications - Sea Ice Mapping
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1.1.6.4.4 Sea Ice Application - Ship Routing through Sea Ice
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1.2 How to Use ASAR Data
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1.2.1 Software Tools
1.2.1.1 General Software Tools
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1.2.1.2 EnviView
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1.2.1.3 ASAR Toolbox
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1.3 Further Reading
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1.4 Image Gallery
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ASAR Products and Algorithms
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2.1 Products and Algorithms Introduction
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2.1.1 Child Products
2.1.1.1 Definition
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2.1.1.2 Child Product Extraction Requirements
2.1.1.2.1 Data Set Selection
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2.1.1.2.2 ISP Subsets Selection (Extracted Instrument Headers)
2.1.1.2.3 Common Archiving Facility Requirements
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2.2 Organisation of Products
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2.3 Definitions and Conventions
2.3.1 Definitions
2.3.1.1 Global and Regional Coverage
2.3.1.2 Auxiliary Data
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2.3.1.3 Geolocation and Geocoding
2.3.1.4 Product Confidence Data
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2.3.1.5 Calibration
2.3.1.6 Processed Product Sizes and Coverage
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2.3.2 Conventions
2.3.2.1 ENVISAT: General product structure
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2.3.2.2 Main Product Header (MPH)
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2.3.2.5 Data Set (DS)
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2.4 Product Evolution History
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2.5 ASAR Level 0 Products
2.5.1 Introduction
2.5.1.1 ASAR Instrument Source Packet
2.5.1.2 Level 0 Products
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2.5.1.2.1 Processing Performed
2.5.1.2.2 High Data Rate Level 0 Products
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2.5.1.2.2.3 Wide Swath (WS) Mode (ASA_WS_0P)
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2.5.1.2.2.4 Level 0 External Characterisation (ASA_EC_0P)
2.5.1.2.3 Low Data Rate Level 0 Products
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2.5.1.2.3.1 Global Monitoring (GM) Mode (ASA_GM_0P)
2.5.1.2.3.2 Wave Mode (WV) Level 0 Product (ASA_WV_0P)
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2.5.1.2.3.3 Level 0 Module Stepping Mode (ASA_MS_0P)
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2.5.1.3 Level 0 Formats
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2.6 Level 1B Products
2.6.1 ASAR Level 1B Algorithms
2.6.1.1 ASAR Level 1B Algorithm Physical Justification
2.6.1.1.1 Introduction
2.6.1.1.2 Radar Geometry
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2.6.1.1.3 Pulse Compression
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2.6.1.1.4 SAR Signal
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2.6.1.1.5 Continuous versus Burst Data
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2.6.1.1.6 Image Cross Spectra
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2.6.1.2 ASAR Level 1B Algorithm Descriptions
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2.6.1.2.1 Preprocessing
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2.6.1.2.2 Doppler Frequency Estimator
2.6.1.2.2.1 Introduction
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2.6.1.2.2.2 Madsen's Method
2.6.1.2.2.3 Multi-Look Cross Correlation (MLCC) Method
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2.6.1.2.2.4 Look Power Balancing
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2.6.1.2.2.5 PRF Diversity Method
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2.6.1.2.2.6 Notes
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2.6.1.2.2.7 References
2.6.1.2.3 Range-Doppler
2.6.1.2.3.1 Introduction
2.6.1.2.3.1.1 Overview
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2.6.1.2.3.1.2 Range Compression
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2.6.1.2.3.1.3 Azimuth FFT
2.6.1.2.3.1.4 Range Cell Migration Correction (RCMC)
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2.6.1.2.3.1.5 Azimuth Compression
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2.6.1.2.3.1.6 Summary
2.6.1.2.3.1.7 References
2.6.1.2.3.2 Processing Algorithms For AP SLC
2.6.1.2.3.2.1 Introduction
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2.6.1.2.3.2.2 Background
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2.6.1.2.3.2.3 Burst Mode Interferometry
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2.6.1.2.3.2.4 Modifications To Range Doppler Algorithm
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2.6.1.2.3.2.5 Conclusions
2.6.1.2.3.2.6 References
2.6.1.2.4 SPECAN
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2.6.1.2.4.1.2 Range Compression
2.6.1.2.4.1.3 Linear Range Cell Migration Correction (RCMC)
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2.6.1.2.4.1.4 Azimuth Processing
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2.6.1.2.4.1.5 Look Summation and Resampling
2.6.1.2.4.1.6 Product Processing
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2.6.1.2.4.1.7 Summary
2.6.1.2.4.1.8 References
2.6.1.2.4.2 Descalloping
2.6.1.2.4.2.1 Scalloping
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2.6.1.2.4.2.2 Methods for Scalloping Correction
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2.6.1.2.4.2.2.1 Azimuth Descalloping Function Application
2.6.1.2.4.2.2.2 Doppler Centroid Frequency Estimation in the context ofBurst Mode Data
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2.6.1.2.4.2.3 Notes
2.6.1.2.4.2.4 References
2.6.1.2.4.3 ScanSAR Beam Merging
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2.6.1.2.4.3.1 Determine a reference point in the blend region
2.6.1.2.4.3.2 Determine the limits of the blend region
2.6.1.2.4.3.3 Merge the data in the two beams corresponding to theblend region according to a predefined rule
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2.6.1.2.4.4 Global Monitoring Mode Inverse Filter
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2.6.1.2.5 ASAR Strip Line Product Processing
2.6.1.2.5.1 2.6.1.2.5.1 Introduction
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2.6.1.2.5.1.1 Slice Size and Overlap
2.6.1.2.5.2 Processing Parameters Affected By Strip Line ProductContinuity Requirements
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2.6.1.2.5.2.1 I And Q Channel Statistics
2.6.1.2.5.2.2 Chirp Replica
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2.6.1.2.5.2.3 Antenna Elevation Gain Correction
2.6.1.2.5.2.4 Doppler Centroid Estimation
2.6.1.2.5.2.5 along-track Pixel Spacing/Start Position
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2.6.1.2.5.2.6 Slant Range/Ground Range (SR/GR) Conversion ToOutput Grid
2.6.1.2.5.2.7 FM Rate
2.6.1.2.5.2.8 First Output Range Sample
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2.6.1.3 Level 1B Accuracies
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2.6.2 Level 1B Products
2.6.2.1 Level 1B High Level Organisation of Products
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2.6.2.1.1 Level 1B Image Products
2.6.2.1.1.1 Image Product Structure
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2.6.2.1.1.1.1 Image Product Data Sets
2.6.2.1.1.2 Stand-Alone (On-Request) Image Products
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2.6.2.1.1.2.1 Stand-Alone Product Types
2.6.2.1.1.2.1.1 Image Mode Single-Look Complex
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2.6.2.1.1.2.1.2 Image Mode Precision Image
2.6.2.1.1.2.1.3 Image Mode Ellipsoid Geocoded Image
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2.6.2.1.1.2.1.4 Alternating Polarisation Mode Single-Look Complex
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2.6.2.1.1.2.1.5 Alternating Polarisation Mode Precision Image
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2.6.2.1.1.2.1.6 Alternating Polarisation Ellipsoid Geocoded Image
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2.6.2.1.1.2.2 Input Data
2.6.2.1.1.2.3 Auxiliary Data Used
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2.6.2.1.1.3 Stripline Processed Image Products
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2.6.2.1.1.3.1 Stripline Product Types
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2.6.2.1.1.3.1.1 Image Mode Medium-resolution Image
2.6.2.1.1.3.1.2 Alternating Polarisation Medium-resolution Image
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2.6.2.1.1.3.1.3 Wide Swath Medium-resolution Image
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2.6.2.1.1.3.1.4 Global Monitoring Mode Image Product
2.6.2.1.1.3.2 Input Data
2.6.2.1.1.3.3 Auxiliary Data Used
2.6.2.1.1.3.4 Product Structure
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2.6.2.1.2 Level 1B Wave Products
2.6.2.1.2.1 Product Types
2.6.2.1.2.1.1 Wave Mode SLC Imagette and Imagette Cross-Spectra
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2.6.2.1.2.1.2 Wave Mode Imagette Cross-Spectra
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2.6.2.1.2.2 Input Data
2.6.2.1.2.3 Auxiliary Data Used
2.6.2.1.2.4 Processing Performed
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2.6.2.1.2.4.1 Wave Mode Error Handling
2.6.2.1.2.5 Product Structure
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2.6.2.1.2.5.1 Main Product Header
2.6.2.1.2.5.2 Specific Product Header
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2.6.2.1.2.5.3 Data Set Names
2.6.2.1.2.5.4 Data Sets
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2.6.2.1.2.5.4.1 MDS Containing Imagettes
2.6.2.1.3 Browse Products
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2.6.2.1.3.1 Product Types
2.6.2.1.3.1.1 Image Mode Browse Image
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2.6.2.1.3.1.2 Alternating Polarisation Browse Image
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2.6.2.1.3.1.3 Wide Swath Browse Image
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2.6.2.1.3.1.4 Global Monitoring Mode Browse Image
2.6.2.1.3.2 Processing Performed
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2.6.2.1.3.3 Product Structure
2.6.2.1.3.3.1 Browse SQ ADS
2.6.2.1.3.3.2 Subsampled Geolocation Grid ADS
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2.6.2.2 Level 1B Engineering Quantities
2.6.2.2.1 Image Products
2.6.2.2.1.1 Medium Resolution Products
2.6.2.2.1.1.1 Image Mode Medium-resolution Image (ASA_IMM_1P)
2.6.2.2.1.1.2 Alternating Polarisation Medium-resolution Image(ASA_APM_1P)
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2.6.2.2.1.1.3 Wide Swath Medium-resolution Image (ASA_WSM_1P)
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2.6.2.2.1.2 Single-Look Complex (SLC) Products
2.6.2.2.1.2.1 Image Mode Single-Look Complex (ASA_IMS_1P)
2.6.2.2.1.2.2 Alternating Polarisation Mode Single-Look Complex(ASA_APS_1P)
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2.6.2.2.1.3 Precision Image Products
2.6.2.2.1.3.1 Image Mode Precision Image (ASA_IMP_1P)
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2.6.2.2.1.3.2 Alternating Polarisation Mode Precision Image(ASA_APP_1P)
2.6.2.2.1.4 Ellipsoid Geocoded Products
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2.6.2.2.1.4.1 Image Mode Ellipsoid Geocoded Image (ASA_IMG_1P)
2.6.2.2.1.4.2 Alternating Polarisation Ellipsoid Geocoded Image(ASA_APG_1P)
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2.6.2.2.1.5 Global Monitoring Products
2.6.2.2.1.5.1 Global Monitoring Mode Image Product (ASA_GM1_1P)
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2.6.2.2.2 Wave Products
2.6.2.2.2.1 Imagette Cross-Spectra Products
2.6.2.2.2.1.1 Wave Mode SLC Imagette and Imagette Cross-Spectra(ASA_WVI_1P)
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2.6.2.2.2.2 Single-Look Complex (SLC) Imagette Products
2.6.2.2.2.2.1 Wave Mode Imagette Cross-Spectra (ASA_WVS_1P)
2.6.2.3 Level 1B Essential Product Confidence Data
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2.7 Level 2 Product and Algorithms
2.7.1 ASAR Level 2 Algorithms
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2.7.1.1 General Description
2.7.1.2 Processing Steps
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2.7.2 Level 2 Product
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2.8 Instrument-specific Topics
2.9 Auxiliary Products
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2.9.1 Summary of Auxiliary Data Sets
2.9.1.1 Auxiliary Data Files
2.9.1.2 Naming Strategy
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2.9.1.3 Auxiliary Data Structure
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2.9.1.4 Auxiliary Data MPH
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2.9.1.5 Auxiliary Data SPH Structure
2.9.1.6 Auxiliary Data Sets
2.9.2 Auxiliary Data Sets for Level 1B Processing
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2.9.3 Common Auxiliary Data Sets
2.9.3.1 FOS Orbit State Vectors
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2.9.3.2 DORIS Preliminary Orbit State Vectors
2.9.3.3 DORIS Precise Orbit State Vectors
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2.9.3.4 DORIS Navigator Level 0
2.9.3.5 UTC/SBT Time Conversion File
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2.9.3.6 ECMWF Data Files
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2.10 ASAR Latency Throughput and Data Volume
2.10.1 Latency
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2.10.2 Throughput
2.10.2.1 Product parameters
2.10.3 Data Volume
2.10.3.1 Product Sizes for Disk Storage
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2.11 ASAR Characterisation and Calibration
2.11.1 Introduction
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2.11.2 Pre-flight Characterisation Measurements
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2.11.3 Internal Calibration
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2.11.3.1 Elevation Gain Monitoring
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2.11.3.2 Chirp Replica Construction
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2.11.3.3 PF-ASAR Normalisation
2.11.3.4 Module Stepping
2.11.4 External Characterisation
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2.11.4.1 Characterisation of the Antenna Beam Pattern
2.11.4.2 Gain Calibration
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2.11.4.3 Global Monitoring Mode
2.11.5 The Derivation of Backscattering Coefficients and RCSsin ASAR Products
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2.11.6 Notes
2.11.7 References
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2.12 ASAR Data Handling Cookbook
2.12.1 Hints and Algorithms for Data Use
2.12.1.1 Extracting Grid Information To Do Plots
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2.12.1.2 Locating the Error Information
2.12.1.3 Converting Units of Engineering/Geophysical parameters
2.12.1.4 Displaying 'Scientific' PCD Information
2.12.2 Hints and Algorithms for Higher Level Processing
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The ASAR Instrument
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3.1 Instrument Description
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3.1.1 Payload Description and Position on the Platform
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3.1.1.1 ASA Subsystem
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3.1.1.2 CESA Subsystem
3.1.1.2.1 Data Subsystem
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3.1.1.2.2 Radio Frequency (RF) Subsystem
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3.1.1.2.3 Control Subsystem (CSS)
3.1.1.2.4 Power Conditioning Unit (PCU)
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3.1.2 ASAR Instrument Functionality
3.1.2.1 Global Mission
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3.1.2.2 Regional Mission
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3.1.3 Internal Data Flow
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3.2 Instrument Characteristics and Performance
3.2.1 Preflight Characteristics and Expected Performance
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3.2.2 Inflight Performance Verification
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ASAR Frequently Asked
Questions
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ASAR Glossary Terms
5.1 Acronyms and Abbreviations
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5.2 RADAR and SAR Glossary
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5.3 Product Terms
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5.4 ASAR Instrument Glossary
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5.5 Geometry Glossary
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5.6 Oceans Glossary
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5.7 Land Glossary
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5.8 Sea Ice Glossary
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ASAR Data Formats Products
6.1 Level 2 Products
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6.1.1 ASA_WVW_2P: ASAR Wave Mode Wave Spectra
ASA_WVW_2P
6.2 Level 1 Products
6.2.1 ASA_APG_1P: ASAR Alternating Polarization EllipsoidGeocoded Image
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ASA_APG_1P
6.2.2 ASA_APM_1P: ASAR Alternating Polarization Medium
Resolution Image product
ASA_APM_1P
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6.2.3 ASA_APP_1P: ASAR Alternating Polarization ModePrecision Image
ASA_APP_1P
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6.2.4 ASA_APS_1P: ASAR Alternating Polarization ModeSingle Look Complex
ASA_APS_1P
6.2.5 ASA_GM1_1P: ASAR Global Monitoring Mode Image
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ASA_GM1_1P
6.2.6 ASA_IMG_1P: ASAR Image Mode Ellipsoid GeocodedImage
ASA_IMG_1P
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6.2.7 ASA_IMM_1P: ASAR Image Mode Medium ResolutionImage
ASA_IMM_1P
6.2.8 ASA_IMP_1P: ASAR Image Mode Precision Image
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ASA_IMP_1P
6.2.9 ASA_IMS_1P: ASAR Image Mode Single Look Complex
ASA_IMS_1P
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6.2.10 ASA_WSM_1P: ASAR Wide Swath Medium ResolutionImage
ASA_WSM_1P
6.2.11 ASA_WVI_1P: ASAR Wave Mode SLC Imagette and
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Imagette Cross Spectra
ASA_WVI_1P
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6.2.12 ASA_WVS_1P: ASAR Wave Mode Imagette CrossSpectra
ASA_WVS_1P
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6.2.13 ASA_WSS_1P: Wide Swath Mode SLC Image
ASA_WSS_1P
6.3 Level 0 Products
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6.3.1 ASA_APC_0P: ASAR Alternating Polarization Level 0(Copolar)
ASA_APC_0P
6.3.2 ASA_APH_0P: ASAR Alternating Polarization Level 0(Cross polar H)
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ASA_APH_0P
6.3.3 ASA_APV_0P: ASAR Alternating Polarization Level 0(Cross polar V)
ASA_APV_0P
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6.3.4 ASA_EC__0P: ASAR Level 0 External Characterization
ASA_EC__0P
6.3.5 ASA_GM__0P: ASAR Global Monitoring Mode Level 0
ASA_GM__0P
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6.3.6 ASA_IM__0P: ASAR Image Mode Level 0
ASA_IM__0P
6.3.7 ASA_MS__0P: ASAR Level 0 Module Stepping Mode
ASA_MS__0P
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6.3.8 ASA_WS__0P: ASAR Wide Swath Mode Level 0
ASA_WS__0P
6.3.9 ASA_WV__0P: ASAR Wave Mode Level 0
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ASA_WV__0P
6.4 Browse Products
6.4.1 ASA_AP__BP: ASAR Alternating Polarization BrowseImage
ASA_AP__BP
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6.4.2 ASA_GM__BP: ASAR Global Monitoring Mode BrowseImage
6.4.3 ASA_IM__BP: ASAR Image Mode Browse Image
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ASA_IM__BP
6.4.4 ASA_WS__BP: ASAR Wide Swath Browse Image
ASA_WS__BP
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6.5 Auxilliary Products
6.5.1 ASA_CON_AX: ASAR Processor Configuration
ASA_CON_AX
6.5.2 ASA_INS_AX: ASAR Instrument characterization
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ASA_INS_AX
6.5.3 ASA_XCA_AX: ASAR External calibration data
ASA_XCA_AX
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6.5.4 ASA_XCH_AX: ASAR External characterization data
6.6 Records
6.6.1 Main Product Header
ENVISAT-1 MPH
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6.6.2 ASAR processor configuration data
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Contains ASAR processor configuration data
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6.6.3 ASAR instrument characterization data
Contains ASAR instrument characterization data
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6.6.4 ASAR external calibration data
Contains ASAR external calibration data
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6.6.5 ASAR external characterization data
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Contains ASAR external characterization data
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6.6.6 Antenna Elevation pattern
Antenna Elevation patterns(s)
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6.6.7 Chirp parameters
Chirp parameters
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6.6.8 Doppler Centroid parameters
Doppler Centroid parameters
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Geolocation Grid ADSRs
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6.6.10 Measurement Data Set 1
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Measurement Data Set 5
6.6.11 ASAR Image Products SPH
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ASAR Image Products SPH
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6.6.12 Main Processing parameters
Main Processing parameters
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6.6.13 Map Projection parameters
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Map Projection parameters
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6.6.14 Ocean Wave Spectra
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Ocean Wave Spectra
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6.6.15 Measurement Data Set containing spectra. 1 MDSR perspectra.
Measurement Data Set containing spectra. 1MDSR per spectra.
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6.6.16 SQ ADSRs
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SQ ADSRs
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6.6.17 Slant Range to Ground Range conversion parameters
Slant Range to Ground Range conversionparameters
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6.6.18 ASAR Wave Mode Products Base SPH
ASAR Wave Mode Products Base SPH
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6.6.19 Wave Mode Geolocation ADS
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Wave Mode Geolocation ADS
6.6.20 Wave Mode processing parameters
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Wave Mode processing parameters
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6.6.21 SQ ADSRs
SQ ADSRs
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6.6.22 ASAR WVI Product SPH
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ASAR WVI Product SPH
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6.6.23 SPH for auxiliary data with N=1 DSDs
SPH for auxiliary data with N=1 DSDs
6.6.24 Level 0 MDSR
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Level 0 MDSR
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6.6.25 Level 0 SPH
Level 0 SPH
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6.6.26 Doppler Centroid parameters
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Doppler Centroid Grid ADS
# Description Units Count Type Size Data Record
0 rst_zero_doppler_time
First Zero Doppler Azimuth time of raw signaldata used for this estimates
MJD 1 mjd 12 byte(s)
1 attach_agAttachment Flag (always set to zero for thisADSR)
ag 1 BooleanFlag 1 byte(s)
2 slant_range_time2-way slant range time origin (t0)
ns 100 100*4 byte(s)
3 dop_coef Fine Doppler centroid frequency estimate. This isthe original estimated Doppler centroid frequncy
befor any polynomial tting is applied
Hz 100 100*4 byte(s)
4 last_zero_doppler_timeLast Zero Doppler Azimuth time of raw signaldata used for this estimates
MJD 1 mjd 12 byte(s)
5 spare_1Spare
- 1 SpareField 388 byte(s)
Record Length : 1213
DS_NAME : Doppler Centroid Grid ADS
Format Version 116.0
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Credits
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