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BAS tutorial


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This service takes a couple of calibrated optical images as inputs and estimates the of burnt areas, based on the Normalized Burn Ratio (NBR) index.


Desciption

This processor performs a Burned Area Severity analysis using nir, swir16 and swir22 radiation from a pair of calibrated optical images. The burned area intensity methodology integrated into this service is based on the Normalized Burn Ratio (NBR) index (Key and Benson, 2006) and its derivatives: the delta Normalized Burn Ratio (dNBR) from Miller and Thode (2014), and the Relativized Burn Ratio (RBR) from Parks et al. (2014).

This processor uses as input calibrated products from the Optical Products Calibration service (Processor #1) having swir22, swir16 and nir08 STAC assets. When available, the processor uses as inputs co-located stack of calibrated optical EO data from processors #8.

Output Products of this service is the burned area intensity analysis from a pair of optical images.

EO sources supported

  • Pair of multispectral calibrated optical images (L1/L2) having at least the following assets (e.g. from Landsat-8 OLI and Sentinel-2 MSI data):
    • red,
    • nir,
    • swir16,
    • and swir22.

Output

  • N=6 single-band TOA reflectance products from a pair of input calibrated datasets and their assets (red, nir, swir22) employed as input in this service. These 6 products are given as a single band GeoTIFF in COG format. Such assets represent a physical meaning product as extracted from the Calibrated Datasets.
  • Single band NBR index (pre-event) in Cloud Optimized Geotiff (COG) format
  • Single band NBR index (post-event) in Cloud Optimized Geotiff (COG) format
  • Single band dNBR index in Cloud Optimized Geotiff (COG) format
  • Single band RBR index in Cloud Optimized Geotiff (COG) format
  • True color Infrared RGB composite as 4 bands RGBA, plus the three single-bands for Red-, Green-, and blue channels, in Cloud Optimized Geotiff (COG) format.

Select the processing


  • After the opening the activation workspace (e.g. [Act-100/Call-100] Global Activation for Validation, on the training instance of the processing Environment), in the right panel of the interface, open the Processing Service tab
  • Select the processing service “Burned Area Severity”:

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The "Burned Area Severity" panel is displayed with parameters values to be filled-in.

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Fill the paramters


Reference input

  • Select the Landsat 8 data collection in the Datasets button menu.

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  • Drag and Drop the selected item in the Optical calibrated pre-event acquisition with red, nir and swir22 field:

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  • Drag and Drop the selected item in the Optical calibrated post-event acquisition with red, nir and swir22 field:

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Area of interest in WKT

  • Draw the AOI by using the spatial filter.

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  • Click on the Magic tool wizard and select AOI. The input parameter is automatically filled with the WKT representing the area selected.

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Note:

This parameter is optional. Then, in this case, we left it empty.


Run the job


  • Click on the button Run Job and see the Running Job

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  • You can monitor job progress through the progress bar

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  • After few minutes, see the Successful Job:

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Results: download and visualization

  • Click on the button Show results
  • See the result on map. The preview appears within the area defined in the spatial filter.

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  • To get more information about the product just click on the preview in the map, a bubble showing the name of the layer “Burned-Area-Severity multi-sensor-composite” will appear and then click on the “Show details” button. In the left panel of the interface, all the details of the layer of the product will appear.

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  • In the Burned Area Severity service the following files are produced:

    • “1.red”: asset red product from reference image 1, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “1.nir”: asset nir product from reference image 1, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “1.swir22”: asset nir product from reference image 1, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “2.red”: asset red product from reference image 2, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “2.nir”: asset nir product from reference image 2, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “2.swir22”: asset swir22 product from reference image 2, as single band TOA reflectance GeoTIFF in COG format (physical meaning product from optical calibration),
    • “nbr_pre”: output NBR spectral index product from post-event image given as single band GeoTIFF in COG format,
    • “nbr_post”: output NBR spectral index product from post-event image given as single band GeoTIFF in COG format,
    • “dnbr”: output dNBR spectral index product given as single band GeoTIFF in COG format,
    • “rbr”: output RBR spectral index product given as single band GeoTIFF in COG format,
    • “red-channel-pre”: R-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “green-channel-pre”: R-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “blue-channel-pre”: B-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “red-channel-post”: R-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “green-channel-post”: R-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “blue-channel-post”: B-channel product from pre-event True Color RGBA given as single band 8-bit GeoTIFF in COG format,
    • “overview-pre”: Post-event True Color RGBA given as 4-band 8-bit GeoTIFF in COG format,
    • “overview-post”: Pre-event True Color RGBA given as 4-band 8-bit GeoTIFF in COG format,
    • “rbr_visual”: RBR visual RGBA given as 4-band 8-bit GeoTIFF in COG format.
  • To download one of the products listed above, just click on the “Download” button under the Details tab in the left panel

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