Point Index Fast

Description

An index of cells with radius queries Assumes the data is compatible with https://open-s2.github.io/s2json/types/Properties.html Because of the nature of low level language like Javascript, using u64 is slow. This index uses f64 which Number supports. So it is fast and efficient.

Usage

import { PointIndexFast } from 'gis-tools-ts';
import { KDMMapSpatialIndex } from 'gis-tools-ts/mmap';

const pointIndex = new PointIndexFast();
// or used a mmap based store
const pointIndex = new PointIndex(KDMMapSpatialIndex);

// insert a lon-lat
pointIndex.insertLonLat(lon, lat, data);
// insert an STPoint
pointIndex.insertFaceST(face, s, t, data);

// after adding data build the index. NOTE: You don't have to call this, it will be called
// automatically when making a query
await pointIndex.sort();

// you can search a range
const points = await pointIndex.searchRange(minX, minY, maxX, maxY);
// or a standard radius search
const points = await pointIndex.searchRadius(qx, qy, r);
// or a spherical radius search that wraps around the -180/180 boundary
const points = await pointIndex.searchRadiusSphere(lon, lat, dist);
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