georgio

Fast geo Rust helper functions for Python.

Great Circle

To get the great circle distance between two points in meters, this function will use the IUGG mean Earth radius.

distance_in_meters = georgio.great_circle_distance(lon1, lat1, lon2, lat2)

If you want to provide your own radius in meters, you can use this function instead.

distance_in_meters = georgio.great_circle_distance_with_radius(lon1, lat1, lon2, lat2, radius_in_meters)

Line Of Bearing (LOB)

Returns the destination coordinates based on a starting position, bearing, and distance in meters. Bearing is in degrees, clockwise from north. It uses the IUGG mean Earth radius.

dest_lon, dest_lat = georgio.line_of_bearing(start_lon, start_lat, bearing_in_degrees, distance_in_meters)

If you want to provide your own radius in meters, you can use this function instead.

dest_lon, dest_lat = georgio.line_of_bearing_with_radius(start_lon, start_lat, bearing_in_degrees, distance_in_meters, radius_in_meters)

Bounding Box

This function will return a bounding box that encompasses the specified distance around a center point. Note that the bounding box will never extend across the antimeridian (longitude +/-180), below latitude -90, or above latitude 90.

west, south, east, north = georgio.bounding_box_for_point(lon, lat, distance_in_meters)

Web Mercator

To get the longitude/latitude bounds of a Web Mercator tile, use the following function, which will return the values in west, south, east, north order.

west, south, east, north = georgio.wm_bounds(x, y, z)

To get the upper left corner of a tile in longitude, latitude order, use the following function.

longitude, latitude = georgio.wm_upper_left(x, y, z)

To get a bounding box that surrounds a tile at a certain distance, use the following function. This can be useful when searching for centerpoints of objects that might be outside of the tile, where the object might extend into the tile. Note that the bounding box size is calculated in the WGS-84 projection based on the tile's longitude/latitude bounds, since Web Mercator is notoriously bad for calculating sizes/distances. Also note that the bounding box will never extend across the antimeridian (longitude +/-180), below latitude -90, or above latitude 90.

west, south, east, north = georgio.wm_tile_expanded_bbox(x, y, z, search_distance_in_meters)