SAR flood mapping with SNAP
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| − | In this tutorial we will use Level-1 Ground Range Detected (GRD) Sentinel-1 data downloaded from the Copernicus Open Access Hub. The example data is from a study area in Nigeria near the city of Lokoja in Kogi province near the junction of the two large rivers Niger and Benue. During the westafrican monsoon April - September heavy rainfall and floods occur. | + | In this tutorial we will use Level-1 Ground Range Detected (GRD) Sentinel-1 data downloaded from the Copernicus Open Access Hub. The example data is from a study area in Nigeria near the city of Lokoja in Kogi province near the junction of the two large rivers Niger and Benue. During the westafrican monsoon April - September heavy rainfall and floods occur. |
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=Data transfer= | =Data transfer= | ||
Download example tutorial data from Nigeria or data from your personal region of interest: two Sentinel-1 scenes one pre-event acquisition date and one post-event date: [[Downloading Sentinel-2 images]]. | Download example tutorial data from Nigeria or data from your personal region of interest: two Sentinel-1 scenes one pre-event acquisition date and one post-event date: [[Downloading Sentinel-2 images]]. | ||
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[[File:esa_openhub_S1.png|600px]] | [[File:esa_openhub_S1.png|600px]] | ||
| + | =Visualization of amplitude bands= | ||
| + | * Open SNAP Desktop. | ||
| + | * Drag and drop the zip files of the Sentinel-2 scenes into the TOC of Product Explorer. | ||
| + | * Unfold the product folders | ||
| + | * Mark the Aplitude_VV bands of both products, right click '''Open 2 Image Window'''. | ||
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| + | [[File:snap_sidebyside.png|400px]] | ||
=Subsetting= | =Subsetting= | ||
Revision as of 16:03, 3 December 2019
In this tutorial we will use Level-1 Ground Range Detected (GRD) Sentinel-1 data downloaded from the Copernicus Open Access Hub. The example data is from a study area in Nigeria near the city of Lokoja in Kogi province near the junction of the two large rivers Niger and Benue. During the westafrican monsoon April - September heavy rainfall and floods occur.
Contents |
Data transfer
Download example tutorial data from Nigeria or data from your personal region of interest: two Sentinel-1 scenes one pre-event acquisition date and one post-event date: Downloading Sentinel-2 images. Select Product type GRD with VV polarization.
Visualization of amplitude bands
- Open SNAP Desktop.
- Drag and drop the zip files of the Sentinel-2 scenes into the TOC of Product Explorer.
- Unfold the product folders
- Mark the Aplitude_VV bands of both products, right click Open 2 Image Window.
Subsetting
Open SNAP Desktop. Drag and drop the zip files of the Sentinel-2 scenes into the TOC. We need to reduce the amount data by subsetting the large Sentinel-1 scenes.
