Cloud removal from sentinel 2
Builds cloud-free Sentinel-2 and Landsat composites over a date range, or opens single acquisitions one layer each, for a Vietnamese province or commune or a rectangle drawn anywhere.
Searches Sentinel-2 surface reflectance (COPERNICUS/S2_SR_HARMONIZED) and Landsat 4, 5, 8 and 9 surface reflectance (Collection 2 Level-2) over a date range. A range can be read two ways: mosaicked into one cloud-free composite per satellite, or searched image by image, ticking the days worth keeping in the preview gallery so that each becomes its own layers and its own export, named for its day. Several satellites can be searched over the same period; each keeps its own products at its own pixel size, and its own colour throughout the interface. Clouds are removed the way each satellite allows, and each has a threshold of its own: a per pixel cloud probability from COPERNICUS/S2_CLOUD_PROBABILITY for Sentinel-2, and the QA_PIXEL flags plus a limit on the reported scene cloud cover for Landsat. Bands are harmonised, so true colour, NDVI and NBR mean the same thing whichever satellite they come from. The area of interest is a Vietnamese administrative unit (province or commune, 2025 units, read from bundled GeoJSON and searchable by typing) or a rectangle drawn on the canvas, which works worldwide; an administrative unit can be cut to its outline or to the box around it. The preview gallery folds out beside the form and shows one thumbnail per acquisition day and satellite with its cloud cover, marking the days the cloud filter is going to discard. Each of the three products, the colour composite, NDVI and NBR, is ticked separately for the map and for Google Drive. The interface is bilingual, English and Vietnamese. Requirements: this plugin does not process imagery locally, it needs the "Google Earth Engine" plugin installed in the same QGIS profile, signed in with a registered Earth Engine account, plus an internet connection. Exports are written to the Google Drive of that account and run as Earth Engine tasks. Restrictions: the bundled administrative boundaries cover Vietnam only, other regions must use the rectangle tool. Developed by GFD (http://gfd.com.vn/)