Dropchop is a browser based GIS built alongside Mapbox as well as Turf.js. It allows y'all to perform quite sophisticated spatial queries on mapped information without a server as well as inward your pick of mesh browser.
Dropchop allows y'all to upload information from your computer, from a URL or fifty-fifty from Overpass Turbo (OpenStreetMap POI's etc) as well as to perform quite sophisticated spatial queries. The best agency to notice out what is possible alongside Dropchop is to play alongside it. If y'all don't accept whatever map information to paw thus y'all tin piece of job the in-built Overpass Turbo sorcerer to catch some information from OpenStreetMap.
For example y'all could piece of job the Overpass Turbo alternative (using the carte to left of the screen) to upload all the bars mapped on OpenStreetMap inward the electrical current map view. This is rattling uncomplicated every bit 'bars' is the default setting inward the in-built Overpass Turbo wizard.
Once all the bars accept loaded on the map y'all tin thus perform a set out of spatial queries on your bar data. All the queries that are possible are highlighted inward the map sidebar. The screenshot higher upwardly shows bars inward East London alongside a buffer of five miles some all the mapped bars. Loading the bar information as well as performing the buffer took me well-nigh twenty seconds.
Once y'all accept performed the required GIS operations on your mapped information y'all tin download the results every bit a GeoJSON file or every bit a shapefile.
