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JasonSanford/geojson-google-maps: A simple utility to convert GeoJSON objects to ...

原作者: [db:作者] 来自: 网络 收藏 邀请

开源软件名称（OpenSource Name）：

JasonSanford/geojson-google-maps

开源软件地址(OpenSource Url)：

https://github.com/JasonSanford/geojson-google-maps

开源编程语言(OpenSource Language)：

JavaScript 100.0%

开源软件介绍(OpenSource Introduction)：

GeoJSON to Google Maps

**Read This! **

Google Maps now has proper support for GeoJSON, so you should probably use that instead.

version 1.0

Jason Sanford

Overview

GeoJSON is used to create Google Maps API v3 vectors (Marker, Polyline, Polygon) from GeoJSON objects (Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, Feature, GeometryCollection, FeatureCollection). Specifically, I'm translating some GeoJSON types to arrays of Google Maps vectors as there aren't really Google Maps equivalents of MultiPoint, MultiLineString, etc.

Constructor Parameters

@param {Object} geojson A valid GeoJSON object. One of Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon, Feature, GeometryCollection, FeatureCollection. See the official GeoJSON spec for more details. GeoJSON examples below.

@param? {Object} options - Optional Options for the specific type of Google Maps vector (Marker, Polyline, Polygon). If none specified, boring black vectors and red markers will be created - Optional. Samples Below.

GeoJSON -> Google Maps equivalents

GeoJSON TypeOutput
Pointgoogle.maps.Point
LineStringgoogle.maps.Polyline
Polygongoogle.maps.Polygon
MultiPointArray of google.maps.Point
MultiLineStringArray of google.maps.Polyline
MultiPolygonArray of google.maps.Polygon
Featuregoogle.maps.[Point,Polyline,Polygon] (depends on Feature geometry type)
FeatureCollectionArray of google.maps.[Point,Polyline,Polygon] (depends on Feature geometry type)
GeometryCollectionArray of google.maps.[Point,Polyline,Polygon] (depends on geometry type)

GeoJSON Examples

// GeoJSON Point
{
	"type": "Point",
	"coordinates": [
		-80.66252,
		35.04267
	]
}

// GeoJSON LineString
{
	"type": "LineString",
	"coordinates": [
		[-80.661983228058659, 35.042968081213758],
		[-80.662076494242413, 35.042749414542243],
		[-80.662196794397431, 35.042626481357232],
		[-80.664238981504525, 35.041175532632963]
	]
}

// GeoJSON Polygon
{
	"type": "Polygon",
	"coordinates": [
		[
			[-80.662120612605904, 35.042875219905184],
			[-80.662141716053014, 35.042832740965068],
			[-80.662171938563816, 35.042789546962993],
			[-80.662209174653029, 35.042750233165179],
			[-80.662250709107454, 35.042716920859959],
			[-80.662627586829899, 35.043072078075667],
			[-80.662595574310288, 35.043162322407341],
			[-80.662142312824884, 35.043015448098977],
			[-80.662145396323511, 35.042970839922489],
			[-80.662117972448982, 35.042908385949438],
			[-80.662120612605904, 35.042875219905184]
		]
	]
}

// GeoJSON Feature
{
	"type": "Feature",
	"id": 9876,
	"geometry": {
		"type": "Point",
		"coordinates": [
			-80.66252,
			35.04267
		]
	},
	"properties": {
		"condition": "Satisfactory",
		"has_garage": false,
		"number_of_bedrooms": 3
	}
}

// GeoJSON FeatureCollection
{
	"type": "FeatureCollection",
	"features": [
		{
			"type": "Feature",
			"id": 9876,
			"geometry": {
				"type": "Point",
				"coordinates": [
					-80.66252,
					35.04267
				]
			},
			"properties": {
				"condition": "Satisfactory",
				"has_garage": false,
				"number_of_bedrooms": 3
			}
		},{
			"type": "Feature",
			"id": 9875,
			"geometry": {
				"type": "Point",
				"coordinates": [
					-80.66262,
					35.04277
				]
			},
			"properties": {
				"condition": "Excellent",
				"has_garage": true,
				"number_of_bedrooms": 4
			}
		}
	]
}

Sample Google Maps Vector Options

// google.maps.Polyline
{
	"strokeColor": "#FFFF00",
	"strokeWeight": 7,
	"strokeOpacity": 0.75
}

// google.maps.Polygon
{
	"strokeColor": "#FF7800",
	"strokeOpacity": 1,
	"strokeWeight": 2,
	"fillColor": "#46461F",
	"fillOpacity": 0.25
}

// google.maps.Marker
{
	"icon": "img/marker-house.png"
}

Error Handling (Invalid GeoJSON)

I've made an attempt to check for properly formatted GeoJSON. If something doesn't look quite right I return a very simple error object.

{
	"error": true,
	"message": "Invalid GeoJSON object: Feature object missing \"properties\" or \"geometry\" member."
}

It would be in your best interest to first check the returned object to see if it's error free.

var myGoogleVector = new GeoJSON(myGeoJSON, options);

if (myGoogleVector.error){
	// Handle the error.
}else{
	myGoogleVector.setMap(myMap);
}



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