ESA SNAP SENTINEL-1 TOOLBOXeoscience.esa.int/landtraining2017/files/materials/D2P12_P.pdf · ‒ A...
Transcript of ESA SNAP SENTINEL-1 TOOLBOXeoscience.esa.int/landtraining2017/files/materials/D2P12_P.pdf · ‒ A...
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ESA SNAP SENTINEL-1 TOOLBOX MULTI-TEMPORAL ANALYSIS OF SENTINEL-1 SAR BACKSCATTERED INTENSITY
Michael FoumelisFrench Geological Survey (BRGM), France
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Goals of the Exercise
‒ Familiarize with open source ESA SNAP Toolbox.
‒ Familiarize with Copernicus Sentinel-1 SAR products.
‒ Training on calculation and analysis of backscatter coefficient from Sentinel-1 detected products
‒ Review of manual as well as batch processing options of ESA SNAP Toolbox
‒ End-to-end showcase over the broader area of Bucharest (Hungary). Contains modified
Copernicus Sentinel data [2017]
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‒ A set of Sentinel-1A SLCs YYYYMMDDTHHMMSSS1A_IW_GRDH_1SDV_20170709T163414_20170709T163439_017397_01D0F4_1BC0S1A_IW_GRDH_1SDV_20170721T163415_20170721T163440_017572_01D647_D282S1A_IW_GRDH_1SDV_20170802T163415_20170802T163440_017747_01DBA1_F344
[downloadable @ https://scihub.esa.int]
‒ Sentinel-1 Precise Orbits (PODs) for the corresponding S1A dates (auxiliary data)
S1A_OPER_AUX_POEORB_OPOD_*.EOF.zip[downloadable @ https://qc.sentinel1.eo.esa.int][stored locally @ C:\Users\#username#\.snap\auxdata\Orbits\Sentinel-1\POEORB\2014]
‒ Digital Elevation Model (DEM) dataset from SRTM 3 arc-sec covering the Area of Interest (auxiliary data)
srtm_40_03.zip [stored locally @ C:\Users\#username#\.snap\auxdata\dem\SRTM 3Sec]
Input Dataset
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EXERCISEMulti-temporal Analysis of Sentinel-1 SAR Backscattered Intensity
Data Preparation
Build Multi-temporal Stacks
Stack Statistics
Multi-temporal Filtering
− Update Orbits− Calibrate− Multi-looking− Terrain Correction
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Read Sentinel-1 SLC (Level-1) Products
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Building Automatic Processing Graph
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Define Processing Parameters
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SNAP Batch Processing Operator
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Apply Batch Processing (*.xml file)
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Batch Processing Results | Products’ Naming
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Close Initial Products
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Create Stack (Container of Multiple Products)
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Create Stack Parameters
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Convert Backscatter (Linear to dB Scale)
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Visual Inspection of Mutli-temporal dataset
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Mutli-temporal Speckle Filtering
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Convert Backscatter (Linear to dB Scale)
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Evaluate Performance of Multi-temporal Filter 1/2
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Evaluate Performance of Multi-temporal Filter 2/2
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Compare Filtered/Unfiltered Sigma0 Values | Scatter Plot
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Generate RGB False Colour Composite
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Generate RGB Composite >> R: 20170709 G: 20170721 B: 20170802
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Export View as Image (*.png)
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Export RGB Composite to Google Earth (*.kmz file)
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Sentinel-1 Multi-temporal 6-days Backscatter Coefficient Composite
R: 20170709G: 20170721B: 20170802
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Multi-temporal Stack Averaging
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Convert Backscatter (Linear to dB Scale)
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Extract Image Statistics
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Lesson Learnt
‒ A full range of processing options for Copernicus Sentinel-1 core products are available in ESA’s SNAP toolbox.
‒ The design and implementation of processing graph (*.xml) in SNAP is straightforward.
‒ A processing graph can be run both via the Graph Builder and the Batch operator.
‒ Processing graphs are effected by SNAP versioning.
‒ Batch processing requires multiple unique input/output files.
‒ Automatic monitoring of an AOI shall be implemented in upcoming SNAP version 6.
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Thank you