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Introduction to BEST(Basic Envisat&ERS SAR Toolbox)
Andrea Minchella
5 September 2007, D3PB-1
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 2
BEST (Basic Envisat&ERS SAR toolbox) is a collection of executable
software tools that has been developed by ESA to facilitate the use of
ESA SAR data. The purpose of the Toolbox is not to duplicate existing
commercial packages, but to complement them with functions dedicated
to the handling of SAR products obtained from the ASAR (Advanced
Synthetic Aperture Radar) onboard Envisat and the AMIs (Active
Microwave Instrument) onboard ERS 1&2.
http://earth.esa.int/best/
BEST overview
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 3
• Data Import and Quick Look
• Data Export
• Data Conversion
• Statistics
• Re-sampling
• Co-registration and Coherence Generation
• Radiometric Resolution Enhancement
• Calibration
Toolbox Functionalities
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 4
Data Import and Quick LookExtract data from Envisat ASAR and ERS SAR products held on any media (CD-ROM/DVD/EXABYTE/hard disk) in a standard ESA formatImport TIFF and GeoTIFF images, generic raster data and ancillary dataQuick Look tool for generating reduced-size TIFF images of datasets directly from original products or from files created by BEST in internal format.
Toolbox Functionalities
Data ExportConverting data from the Toolbox's internal format to the common image formats TIFF, GeoTIFF or BIL, to allow visualisation of processing results. Data may be exported as a single channel, as a RGB false-colour composite or in multi-channel binary files.
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 5
Data ConversionConvert between different image formats (e.g. Complex to amplitude, amplitude to power etc.) and perform basic mathematical operations on images.Also for altering image orientation (flipping) and transforming data from slant range to ground range. Additional tool for calculating the sensitivity vectors for points in an image.
StatisticsCalculate global or local statistical parameters from real image data and compute the principal components of multi-dimensional datasets.
Toolbox Functionalities
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 6
Re-samplingOver- and under-sampling (both spatial and spectral)
Coregistration and Support for InterferometryAutomatic co-registration of both real and complex images and evaluation of associated residuals, quality and coherence values. Also for generating an optimised coherence image and computing the interferometric altitude of ambiguity. Additional tools for deriving orbital baselines from pairs of DORIS files and geometrically correcting ASAR medium resolution products.
Toolbox Functionalities
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 7
Toolbox Functionalities
Radiometric Resolution EnhancementA Gamma MAP speckle filtering tool for increasing the radiometric resolution of the backscatter image. The filter can be used with real or complex images and has a range of parameters configurable by the user.
CalibrationAlgorithms for performing various levels of radiometric correction to an input image, including the generation of an image in which the pixel values represent the backscattering coefficient. The calibration tool is based for ERS on the document "Derivation of backscattering coefficient in ERS SAR PRI images (version 2.c)", for ENVISAT on the document "Absolute Calibration of ASAR level 1 products generated with PF-ASAR". Also for replacing the antenna pattern used to calibrate an ASAR product (retro-calibration) and enhancing ASAR Wide-swath images by correcting incidence angle effects in range and smoothing the steps between ScanSAR sub-swaths.
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 8
This practical session on BEST wants to illustrate
how is possible to get a time series of 3 co-
registered, calibrated and speckle-reduced ERS
2-SAR PRI data using BEST and ERDAS
BEST permits to handle ESA SAR data but it has not an efficient display for visualization, hence it is almost indispensable to use another SW package (in our case ERDAS).
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 9
Main Directory : C:\Lisbon_training_BEST\
How your training directory is organized
ERS2 DATA
In BEST_Working directory there will be all files generating using BEST
In ERDAS_Working directory there will be all files generating using ERDAS
!! Please check if you have all !!!
Please save YOUR FILES IN THESE DIRECTORIES and using the name reported in the following,
avoiding to leave in file name blank space
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 10
• ERS 2 PRI Product
• Frame 2682
• 7 August 1998 orbit 17239
• 25 December 1998 orbit 19243
• 9 April 1999 orbit 20746
Data
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 11
Location of the scene
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 12
Main Steps using BEST:
1. Header analysis: to extract the information data from the file.
2. Full Resolution Extraction: to extract the image from the ESA file
3. Quick Look Generation: to have a first look of the product.
4. Portion Extraction: to have a subset of the image.
5. Quick look and Ancillary Data Dump of the extracted portion
6. Calibration
a) Amplitude to Power
b) ADC compensation
c) Backscattering image
These steps will be done for each acquisition
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 13
7. Automatic Coregistation of backscattering images
8. Export to BIL format preserving the data and allowing the handling of the data with
other SW
Main steps using BEST
Main Steps using ERDAS
1. Import the BIL format into Erdas internal format (.img)2. Visualization3. Speckle suppression4. Layer stacking5. RGB visualization
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 14
Using BEST
C:\Lisbon_training_BEST\ BEST_Working
Before to start Setup Working directory
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 15
1. Header analysis
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 16
2. Full Resolution Extraction
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 17
3. Quick Look Generation
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 18
4. Portion Extraction
Quick look
TL Row = 1500
TL Col = 500
BR Row = 4999
BR Col = 3999
3500 pixel
3500 pixel
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 19
4. Portion Extraction
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 20
5. Quick Look Generation of subset image
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 21
Quick Look of subset image
3500
3500
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 22
5. Ancillary Data Dump function permits to retrieve annotation about the image
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 23
6. Calibrationa) Amplitude to Powerb) ADC compensation
c) Backscattering image
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 24
6. Calibrationa) Amplitude to Power
b) ADC compensationc) Backscattering image
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 25
6. Calibrationa) Amplitude to Power
b) ADC compensation
c) Backscattering image
Using BEST - First image: 7 August 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 26
1. Header analysis
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 27
2. Full Resolution Extraction
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 28
3. Quick Look Generation
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 29
4. Portion Extraction
Quick look
TL Row = 1500
TL Col = 500
BR Row = 4999
BR Col = 3999
3500 pixel
3500 pixel
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 30
4. Portion Extraction
Using BEST - Second image: 25 December 1998
For time reason we skip step 5 not proper necessary
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 31
6. Calibrationa) Amplitude to Powerb) ADC compensation
c) Backscattering image
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 32
6. Calibrationa) Amplitude to Power
b) ADC compensationc) Backscattering image
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 33
6. Calibrationa) Amplitude to Power
b) ADC compensation
c) Backscattering image
Using BEST - Second image: 25 December 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 34
1. Header analysis
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 35
2. Full Resolution Extraction
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 36
3. Quick Look Generation
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 37
4. Portion Extraction
Quick look
TL Row = 1500
TL Col = 500
BR Row = 4999
BR Col = 3999
3500 pixel
3500 pixel
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 38
4. Portion Extraction
For time reason we skip step 5 not properly necessary
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 39
6. Calibrationa) Amplitude to Powerb) ADC compensation
c) Backscattering image
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 40
6. Calibrationa) Amplitude to Power
b) ADC compensationc) Backscattering image
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 41
6. Calibrationa) Amplitude to Power
b) ADC compensation
c) Backscattering image
Using BEST – Third image: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 42
7. Automatic Co-registration of 3 Backscattering subset images (nearest neighbourhood re-sampling method)
Using BEST
1 2
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 43
Using BEST – Automatic co-registration
1. Custom parameters
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 44
2. Optional output parameters
Using BEST – Automatic co-registration
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 45
Now we have generated 3 co-registered and calibrated images
A backscattering time series
Using BEST – Automatic co-registration
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 46
8. Export to BIL format The BIL format preserves the radiometric values
Using BEST: BIL format
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 47
Using BEST: BIL format
From this point we use ERDAS
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 48
Main Steps 1. Import the BIL format into Erdas (.img)2. Visualization 3. Speckle suppression4. Layer stacking5. RGB visualization
Using ERDAS
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 49
Using ERDAS: import BIL format-7Aug1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 50
Using ERDAS: import BIL format-25 Dec 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 51
Using ERDAS: import BIL format-9 Apr 1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 52
Using ERDAS: Visualization and Blend function
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 53
Using ERDAS: Speckle suppression- 7aug1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 54
Using ERDAS: Speckle suppression- 25 dec1998
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 55
Using ERDAS: Speckle suppression- 9 Apr 1999
9april1999.img 9april1999_speckle_reduced.img
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 56
Using ERDAS: Layer Stacking of speckle-reduced data
Layer orderLayer 1: 7 August 1998Layer 2: 25 December 1998Layer 3: 9 April 1999
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 57
Using ERDAS: Visualization RGB Layer Stacking
RGB visualizationLayer 1 (7 August 1998) REDLayer 2 (25 December 1998) GREENLayer 3 (9 April 1999) BLUE
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 58
Using ERDAS: Visualization RGB and FLIP
Flipping the image is visualized in a “like geographic system”
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 59
Using ERDAS: Visualization RGB and comments
5 September 2007 D3PB-1 Forest-Agriculture: Introduction to BEST software A. Minchella 60
Using ERDAS: Visualization RGB and comments