Polars-Reverse-Geocode

Polars plugin based on https://github.com/gx0r/rrgeo.

rrgeo takes a latitude and longitude as input and returns the closest city, country, latitude, and longitude, using a k-d tree to efficiently find the nearest neighbour based on a known list of locations. This can be useful if you need to reverse geocode a large number of coordinates quickly, or just need the rough location of coordinates but don't want the expense or complication of an online reverse geocoder.

Installation

pip install polars-reverse-geocode

Usage example

import polars as pl

from polars_reverse_geocode import find_closest_city

df = pl.DataFrame({
    'lat': [37.7749, 51.01, 52.5],
    'lon': [-122.4194, -3.9, -.91]
})
print(df.with_columns(city=find_closest_city('lat', 'lon')))

shape: (3, 3)
┌─────────┬───────────┬───────────────────┐
│ lat     ┆ lon       ┆ city              │
│ ---     ┆ ---       ┆ ---               │
│ f64     ┆ f64       ┆ str               │
╞═════════╪═══════════╪═══════════════════╡
│ 37.7749 ┆ -122.4194 ┆ San Francisco     │
│ 51.01   ┆ -3.9      ┆ South Molton      │
│ 52.5    ┆ -0.91     ┆ Market Harborough │
└─────────┴───────────┴───────────────────┘