Where objects thicken and how unlikely that is by chance: clustering, density grids, kernel density estimation, hot spots, Moran's I, IDW interpolation and spatial regression. The outputs are ready-made grids and numeric metrics you can drop straight into a choropleth or a report.
Groups point features into clusters: the neighbourhood radius eps_m and the minimum cluster size min_points are set by parameters.
Counts the features of a layer in each cell of a regular grid of a given size — the base for a density map.
Builds a kernel density estimate grid over the features of a layer; the grid size is set by grid_size. The output is per-cell values in JSON.
Finds the cells where the concentration of features is above a threshold and returns them as polygons — the zones of clustering.
Interpolates the density of point features onto a regular grid by inverse distance weighting; the strength of influence is set by power.
Computes the spatial autocorrelation index over a grid of cells: whether the values are clustered in space or scattered at random.
Estimates the relationship between two layers over a grid of cells: regression coefficients and correlation. A statistical relationship is not proof of causation.
The input is a rectangular bounding box in WGS84 plus one of nine data layers; some tools also take a point. The output is GeoJSON, JSON metrics or a GeoTIFF.
| Layer | What it holds |
|---|---|
| buildings | buildings |
| roads | roads and streets |
| poi | points of interest: services, shops, tourism |
| water | water bodies |
| green_areas | green areas: parks, forests, lawns |
| railways | railways |
| boundaries | administrative boundaries |
| landuse | land use |
| waterways | waterways |
Every tool in the section is free. The bounding box may cover up to 100 km². Rate limits are 10 requests per minute per tool run and 30 requests per minute for reading the catalogue. Without signing in you get up to 10 successful calculations a day; after that the service asks you to register and answers 402 with the code login_required. A box larger than the allowed area is also 402, and an unknown tool id is 404.