Ice surface velocities using SAR
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1 Ice surface velocities using SAR Thomas Schellenberger, PhD ESA Cryosphere Remote Sensing Training Course 2018 UNIS Longyearbyen, Svalbard 12 th June 2018
2 Outline Data access - scihub.copernicus.eu/dhus - Batch download Software ESA Sentinel-1 Toolbox in SNAP Offset tracking - Open the products in S1TBX - View the products and metadata - Apply orbit file - Co-register the images into a stack using DEM - Create subset image containing Rink Glacier - SAR offset tracking: generate glacier velocity map - View the glacier velocity map in S1TBX - Geocoding - View the glacier velocity map in QGIS - Compare map to Sentinel-2 velocity map 2
3 Data Access batch script: dhusget.sh 3
4 Software ESA Sentinel Application Platform (SNAP) Sentinel 1 Toolbox SENTINEL-1, ERS-1&2, ENVISAT, ALOS PALSAR, TerraSAR-X, COSMO-SkyMed, RADARSAT Commercial SAR software: Gamma Remote Sensing and Sarscape 4
5 Open SNAP and load S1 raw data Open SNAP Desktop Restore Window Group by clicking in the upper left corner twice File Open Product Navigate to the folder _ Select the S1A raw files (.zip) and click Open S1A_IW_GRDH_1SSH_ T zip S1A_IW_GRDH_1SSH_ T zip 5
6 View raw data Unfold the first product Unfold Bands Double-click on Amplitude_HH Play around with Colour Manipulation using Sliders What kind of features can you see? Check coverage of the scene under World View 6
7 View metadata Unfold the first product Unfold Metadata Double-click on Abstracted Metadata Find the geometric resolution in range and azimuth 7
8 Apply Orbit File Radar Apply Orbit File Select first file file as source Set Name of Target Product: 02_ _5_Orb.dim Choose your Directory Press Run Repeat with second file
9 DEM Assisted co-registration with XCorr Please DO NOT press Run!!! Aster 1sec GDEM 03_ _ _Orb_Stack 9
10 Load co-registered stack 03_ _ _orbit_Stack.dim Close the four files File Open Product Navigate to the folder _ Select 03_ _ _orbit_Stack.dim and click Open Unfold the product Unfold Bands Double-click on Amplitude_HH_mst_24Oct
11 Subsetting Right-click in Viewer Spatial Subset from view Go to the Geo Coordinates Tab and enter boundaries Press OK Check also the other parameters in Band Subset, etc Find the subset in the Product Explorer immediately Check coverage by opening to viewer 11
12 Save subset Select subset in Product Explorer Right-click Save Product Choose filename, e.g. 04_ _ _Orb_Stack_subset.dim Press Save 12
13 Outline Data access - scihub.copernicus.eu/dhus - Batch download Software ESA Sentinel-1 Toolbox in SNAP Offset tracking - Open the products in S1TBX - View the products and metadata - Apply orbit file - Co-register the images into a stack using DEM - Create subset image containing Rink Glacier - SAR offset tracking: generate glacier velocity map - View the glacier velocity map in S1TBX - Geocoding - View the glacier velocity map in QGIS - Compare map to Sentinel-2 velocity map 13
14 Radar SAR Applications Offset Tracking SAR offset tracking Adjust I/O Parameters and Processing Parameters filename: 05_ _ _orbit_Stack_subset_vel.dim set Grid Azimuth Spacing to 50 set Grid Range Spacing to 50 set Max Velocity (m/day) to 15.0 uncheck Fill Holes Optionally: File Save Parameters Press Run 14
15 SAR offset tracking SAR intensity Displacement Registration Window Width / Height Grid Spacing
16 Velocity Unfold 05_ _ _orbit_Stack_subset_vel Unfold Bands Double-click on Velocity_slv1_05Nov2015 to open 16
17 Velocity direction Layer Layer Manager Deselect Vector data Click on the button to open the Add Layer window Select Coregistered GCP Movement Vector Press Finish Play around with Colour Manipulation using Sliders 17
18 Outline Data access - scihub.copernicus.eu/dhus - Batch download Software ESA Sentinel-1 Toolbox in SNAP Offset tracking - Open the products in S1TBX - View the products and metadata - Apply orbit file - Co-register the images into a stack using DEM - Create subset image containing Rink Glacier - SAR offset tracking: generate glacier velocity map - View the glacier velocity map in S1TBX - Geocoding - View the glacier velocity map in QGIS - Compare map to Sentinel-2 velocity map 18
19 Geocoding Velocity Radar Geometric Ellipsoid correction Geolocation Grid Adjust I/O Parameters set filename: 06_ _ _Orb_Stack_subset_vel_EC Adjust Processing Parameters choose Map Projection UTM /WGS 84 (Automatic) Press OK and Run 19
20 Export to GeoTIFF Unfold 06_ _ _Orb_Stack_subset_vel_EC Unfold Bands Click on Velocity_slv1_05Nov2015 to select File Export GeoTIFF Filename: 07_ _ _Orb_Stack_subset_vel_EC_Geo.tif 20
21 Outline Data access - scihub.copernicus.eu/dhus - Batch download Software ESA Sentinel-1 Toolbox in SNAP Offset tracking - Open the products in S1TBX - View the products and metadata - Apply orbit file - Co-register the images into a stack using DEM - Create subset image containing Rink Glacier - SAR offset tracking: generate glacier velocity map - View the glacier velocity map in S1TBX - Geocoding - View the glacier velocity map in QGIS - Compare map to Sentinel-2 velocity map 21
22 QGIS Open QGIS Project New Navigate to folder and open the following files (or drag and drop) 07_ _ _Orb_Stack_subset_vel_EC_Geo.tif 02_ _intensity.tif 02_ _intensity.tif 22
23 QGIS - Layer Properties Double-click the velocity file to open Layer Properties Change settings: Render Type: Singleband pseudocolor Min: 0 Max: 9 Interpolation: Linear Color: Spectral Check Invert Mode: Equal interval Classes: 19 23
24 QGIS Profile Tool Comparison to optical offset tracking Plugins Manage and Install Plugins Search: Profile tool Select Profile Tool and press Install plugin 24
25 QGIS Profile Tool Draw line Add Layer How does the intensity look like? 25
26 Thank you!
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