Geo Mesh

Mesh type and details

mesh type	base point (lng, lat)	lat interval	lng interval	one length
1	100,0	0.666666...	1	about 80km
2	100,0	0.083333...	0.125	about 10km
3	100,0	0.008333...	0.0125	about 1km
4	100,0	0.000833...	0.00125	about 100m
custom	100,0	-	-	-

General open data and its base point

open data name	base point (lng, lat)
国土数値情報	100, 0

How To Use

1. install this module

npm install geo_mesh

2. require this module and initialize

let GeoMesh = require('geo_mesh')
  , geoMesh = new GeoMesh(3)
  ;

3. call some api

let tileOffset = geoMesh.getMeshOffsetFromFitPoint(lat, lng);
let meshCoordinates = geoMesh.getRectCoordinatesFromMeshOffset(tileOffset.x, tileOffset.y);
console.log(meshCoordinates);
```

## API List

* @constructor(type, basePoint, interval)
  * @args {String} type [1, 2, 3, 4, custom] --- mesh type
  * @args {Object} basePoint {lat: x, lng: y} --- starting point of the tile
  * @args {Object} interval {x: x, y: y} --- interval between latitude and longitude (only use custom)
  * @return {GeoMesh Instance}

* @getMeshOffsetFromFitPoint(lat, lng)
  * @args {Number} lat
  * @args {Number} lng
  * @return {MeshOffset}
    * @config {Number} x
    * @config {Number} y

Return the mesh containing the given coordinates.

* @getRectCoordinatesFromMeshOffset(offsetX, offsetY)
  * @args {Number} offsetX --- mesh offset X
  * @args {Number} offsetY --- mesh offset Y
  * @return {Array.<{lat: Number, lng: Number}, ...>}

Get the mesh coordinates from mesh offset.

* @getMeshOffsetsFromFitLine(coordinates)
  * @args {Array.<{lat: Number, lng: Number}>} coordinates --- line coordinates
  * @return {Array.<x: Number, y: Number>}

Get all the mesh coordinates containing the linestring.


* @getMeshOffsetsFromFitPolygon(coordinates)
  * @args {Array.<{lat: Number, lng: Number}>} coordinates --- polygon coordinates
  * @return {Array.<x: Number, y: Number>}

Get all the mesh coordinates containing the polygon.

## Example

run below. then open `http://localhost:3333`

```sh
export GEOMESH_GOOGLE_APIKEY=${google maps api key}
npm run example
```

## Use in browser

execute the following command

```sh
npm run build
```

After that, read the file in the `dist/` directory from html