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Land Cover Change Analysis Workflow
Detailed instructions are in Lab Five in the course manual. Summary:
- Save a kml file of the area of interest and load it in Earthdata to look for images (spatial filter).
- To find appropriate tiles in Earthdata, apply collection filter (landsat) and temporal filter (years of interest). To further refine the area of interest, apply a spatial filter by grid code derived from a relevant Landsat tile.
- Download granules and geotiff products.
- Uncompress .tar.gz files.
- Note: Remember that most Landsat images will require patching, so download more than one granule.
- Use tips from Lab 4 and end of Lab 5 for metadata format.
These steps are outlined in Lab 7.
Requires the following: concatenate band images, optical calibration, and manage noData. These steps can be carried out in Orfeo and are outlined in Lab 8 and in the videos L8a_Concatenate, L8b_OpticalCalibration, L8h_RecapOpticalCalibrationMaskingPatching. Summary:
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Image concatenation: Launch OTB applications browser and use Image Manipulation -> ConcatenateImages. Set output to uint 8. Set different RGB composites to check. (L8a_Concatenate)
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Optical calibration: Open the Calibration -> Optical Calibration tool. Save output as float, calibration level is Image to Top of Atmosphere, fill out the rest of the parameters using the scrapeMetaData sheet (may need to alter the formulae in the sheet depending on landsat year). (L8b_OpticalCalibration)
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NoData management:
- Set no data values. (L8g_NoDataMasking)
- Create no data mask for each image and set same grid for both images.
- Apply masks to each other. (L8h)