Grid functions

Grid operators-and-functions functions are used to calculate with data items of grid (two-dimensional) domains, explicitly using the two-dimensional structure of data in grid, like potential or district.

• dist2 - the distances in a grid towards a point data item
• griddist - impedance in a grid towards the nearest point in a pointset, summing the resistances of the shortest path to the nearest point

• potential - a neighborhood operation to sum the values of neighbouring cells in a grid, based on a kernel
• proximity - a neighborhood operation to get the maximum value of neighbouring cells in a grid, based on a kernel
• diversity - the number of different occurrences in the neighbourhood of each cell in a grid

• district - partition according to areas of adjacent (horizontal & vertical, not diagonal) grid cells with the same values
• district_8 - partition according to areas of adjacent (horizontal & vertical & diagonal) grid cells with the same values
• perimeter - for each occurring partition count the number of edges that cells of that partition have with other cells or the raster border
• perimeter_weighted - same, but with provided weights for the North, East, South, and West edges

• raster_merge - to merge data from smaller to larger grids, e.g. to combine country grids to a European grid