Introduction
When analysing raster data for conditions that relate to a neighbourhood, edge effects are inevitable. To avoid that, Karttur’s GeoImagine Framework can generated virtual mosaics that enlarge every tile by using all 8 neighbours. Any neighbourhood analysis can then be done using the enlarged, virtual mosaic, while limiting the output to the core tile region. The result will be a set of seamless tiles without any edge effects.
MosaicAdjacentTiles
The process for generating enlarged virtual tiles is MosaicAdjacentTiles. The process operates on regions defined for any projection system (e.g. MODIS SIN or EASE-grids).
json
All required parameters have default values. The virtual tile will always be saved as a virtual GDAL dataset, with the ending -full.vrt added to the basename of the original tile. The default expansing is 101 cells in all directions.
Applying the enlarged virtual mosaics
When running processes that rely on neighborhood analysis you apply the enlarged tiles by setting the parameter mosaic to true.