Open Hub. Register for a new account: click Login and Sign-up
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- Bu sahifa navigatsiya:
- Mission:Sentinel-2 . Choose the Product type
- Product Explorer
- Resampling Parameters
- Pixel Coordinates and (Geographical) Geo Coordinates
Downloading Sentinel-2 images Using the Open Hub Visit the Copernicus Open Access Hub and click on Open Hub. Register for a new account: click Login and Sign-up on the upper right. You will receive an email with a link to validate your email address. Following this you can login and start to search for data. The Navigation mode on upper right of the web map is activated by default. Pan to your region of interest holding left click. Zoom into your region of interest using the middle mouse wheel or enable a middle-click with gestures on your touchpad. Activate the Area mode . Draw a rectangle holding left click or digitize a polygon with several left clicks. End digitizing by a double click. Open the tab on the upper left and enter search criteria (please see overview on all options for Advanced Search ). Enter the 'Sensing period of interest by entering the "from" and "to" date. Activate the checkbox of the Mission:Sentinel-2. Choose the Product type (Level 1C: S2MSI1C or Level 2A: S2MSI2A). Choose Cloud Cover %: [0 TO 20]. Click on to run a search and display available satellite scenes. Have a closer look on the previews. Select a single product or add several products to a cart for downloading. Preprocessing Sentinel-2 with SNAP Reading a Sentinel-2 tile 1. Download a complete Sentinel-2 tile from ESA Open Access Hub (see Downloading Sentinel-2 images ). 2. Start SNAP Desktop 3. F ILE --> O PEN P RODUCT ...) Browse to the compressed Sentinel-2 zip file. Open or drag and drop the zip file from Windows File Explorer into the SNAP Product Explorer tab. 4. Click on the plus sign of the file name in Product Explorer. Unfold Metadata and Bands. Displaying a Sentinel-2 tile 1. Mark the file name in the Product Explorer. Right click Open RGB Image Window) . In the Profile drop-down list select Sentinel 2 MSI False Colour Infrared. OK Resampling The spatial resolution of all satellite bands should be resampled to a unique pixel size (10m) to simplify the processing workflow. 1. R ASTER --> G EOMETRIC O PERATIONS --> R ESAMPLING . Open the Resampling Parameters tab. Define size of resampled product: check by reference band from source product. Select B2 from drop down list. Run . Subsetting Spatial subset Mark the file name of the resampled product from previous work step in Product Explorer. R ASTER --> S UBSET .. Left click in the preview of the Specify product subset dialog. In the Spatial Subset tab draw a box on top of the preview image and move it to your region of interest. Make a note of Pixel Coordinates and (Geographical)' Geo Coordinates if you want to repeat this step with other acquisition dates of the same tile. Spectral subset In Band Subset tab click Select none and then check only the multispectral Reflectance Bands (B2,B3,B4,B5,B6,B7,B8,B8A,B11,B12). OK . Write to permanent file Mark the subset file name in Product Explorer. F ILE --> E XPORT --> G EO TIFF . Click Export Product . Download 254.89 Kb. Do'stlaringiz bilan baham: |
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