Library to provide basic geospatial operations like distance calculation, conversion of decimal coordinates to sexagesimal and vice versa, etc.
Calculates the distance between two geo coordinates
Takes 2 or 3 arguments. First 2 arguments must be an object with latitude and a longitude properties (e.g. {latitude: 52.518611, longitude: 13.408056}). Coordinates can be in sexagesimal or decimal format. 3rd argument is accuracy (in meters). So a calculated distance of 1248 meters with an accuracy of 100 is returned as 1200 (accuracy 10 = 1250 etc.).
Return value is always an integer and represents the distance in meters.
geolib.getDistance(
{latitude: 51.5103, longitude: 7.49347},
{latitude: "51° 31' N", longitude: "7° 28' E"}
);
geolib.getDistance(
{latitude: 51.5103, longitude: 7.49347},
{latitude: "51° 31' N", longitude: "7° 28' E"}
);
// Working with W3C Geolocation API
navigator.geolocation.getCurrentPosition(
function(position) {
alert('You are ' + geolib.getDistance(position.coords, {
latitude: 51.525,
longitude: 7.4575
}) + ' meters away from 51.525, 7.4575');
},
function() {
alert('Position could not be determined.')
},
{
enableHighAccuracy: true
}
);
Calculates the geographical center of all points in a collection of geo coordinates
Takes an object or array of coordinates and calculates the center of it.
Returns an object: {"latitude": centerLat, "longitude": centerLng, "distance": diagonalDistance}
var spots = {
"Brandenburg Gate, Berlin": {latitude: 52.516272, longitude: 13.377722},
"Dortmund U-Tower": {latitude: 51.515, longitude: 7.453619},
"London Eye": {latitude: 51.503333, longitude: -0.119722},
"Kremlin, Moscow": {latitude: 55.751667, longitude: 37.617778},
"Eiffel Tower, Paris": {latitude: 48.8583, longitude: 2.2945},
"Riksdag building, Stockholm": {latitude: 59.3275, longitude: 18.0675},
"Royal Palace, Oslo": {latitude: 59.916911, longitude: 10.727567}
}
geolib.getCenter(spots);
geolib.getCenter([
{latitude: 52.516272, longitude: 13.377722},
{latitude: 51.515, longitude: 7.453619},
{latitude: 51.503333, longitude: -0.119722}
]);
Checks whether a point is inside of a polygon or not. Note: the polygon coords must be in correct order!
Returns true or false
geolib.isPointInside(
{latitude: 51.5125, longitude: 7.485},
[
{latitude: 51.50, longitude: 7.40},
{latitude: 51.555, longitude: 7.40},
{latitude: 51.555, longitude: 7.625},
{latitude: 51.5125, longitude: 7.625}
]
); // -> true
Similar to is point inside: checks whether a point is inside of a circle or not.
Returns true or false
// checks if 51.525, 7.4575 is within a radius of 5km from 51.5175, 7.4678
geolib.isPointInCircle(
{latitude: 51.525, longitude: 7.4575},
{latitude: 51.5175, longitude: 7.4678},
5000
);
Sorts an object or array of coords by distance from a reference coordinate
Returns a sorted array [{latitude: x, longitude: y, distance: z, key: property}]
// coords array
geolib.orderByDistance({latitude: 51.515, longitude: 7.453619}, [
{latitude: 52.516272, longitude: 13.377722},
{latitude: 51.518, longitude: 7.45425},
{latitude: 51.503333, longitude: -0.119722}
]);
// coords object
geolib.orderByDistance({latitude: 51.515, longitude: 7.453619}, {
a: {latitude: 52.516272, longitude: 13.377722},
b: {latitude: 51.518, longitude: 7.45425},
c: {latitude: 51.503333, longitude: -0.119722}
});
Finds the nearest coordinate to a reference coordinate.
var spots = {
"Brandenburg Gate, Berlin": {latitude: 52.516272, longitude: 13.377722},
"Dortmund U-Tower": {latitude: 51.515, longitude: 7.453619},
"London Eye": {latitude: 51.503333, longitude: -0.119722},
"Kremlin, Moscow": {latitude: 55.751667, longitude: 37.617778},
"Eiffel Tower, Paris": {latitude: 48.8583, longitude: 2.2945},
"Riksdag building, Stockholm": {latitude: 59.3275, longitude: 18.0675},
"Royal Palace, Oslo": {latitude: 59.916911, longitude: 10.727567}
}
// in this case set offset to 1 otherwise the nearest point will always be your reference point
geolib.findNearest(spots['Dortmund U-Tower'], spots, 1)
Calculates the length of a collection of coordinates
Returns the length of the path in meters
// Calculate distance from Berlin via Dortmund to London
geolib.getPathLength([
{latitude: 52.516272, longitude: 13.377722}, // Berlin
{latitude: 51.515, longitude: 7.453619}, // Dortmund
{latitude: 51.503333, longitude: -0.119722} // London
]); // -> 945235
Calculates the speed between two points within a given time span.
Returns the speed in options.unit (default is km/h).
geolib.getSpeed(
{lat: 51.567294, lng: 7.38896, time: 1360231200880},
{lat: 52.54944, lng: 13.468509, time: 1360245600880},
{unit: 'mph'}
); // -> 66.9408 (mph)
Converts a given distance (in meters) to another unit.
unit can be one of:
- m (meter)
- km (kilometers)
- cm (centimeters)
- mm (millimeters)
- mi (miles)
- sm (seamiles)
- ft (foot)
- in (inch)
- yd (yards)
distance distance to be converted (source must be in meter)
round fractional digits
geolib.convertUnit('km', 14213, 2) // -> 14,21
Converts a sexagesimal coordinate to decimal format
geolib.sexagesimal2decimal("51° 29' 46\" N")
Converts a decimal coordinate to sexagesimal format
geolib.decimal2sexagesimal(51.49611111); // -> 51° 29' 46.00
Returns the latitude/longitude/elevation for a given point and converts it to decimal.
Works with:
- latitude:
latitude,lat, 0 (GeoJSON array) - longitude:
longitude,lng,lon, 1 (GeoJSON array) - elevation:
elevation,elev,alt,altitude, 2 (GeoJSON array)
geolib.latitude({lat: 51.49611, lng: 7.38896}); // -> 51.49611
geolib.longitude({lat: 51.49611, lng: 7.38896}); // -> 7.38896
Checks if a coordinate is already in decimal format and, if not, converts it to
geolib.useDecimal("51° 29' 46\" N"); // -> 51.59611111
geolib.useDecimal(51.59611111) // -> 51.59611111
- Dropped support for IE6, IE7, IE8
- Added new methods `geolib.latitude()`, `geolib.longitude()`, `geolib.elevation()` to get latitude, longitude or elevation of points. Will be converted to decimal format automatically
- Added new method `geolib.extend()` to extend geolib object
- Added support for GeoJSON format (`[lon, lat, elev]`)
- Added property `geolib.version` to query the currently used version
- Moved `geolib.elevation` to an optional module (`geolib.elevation.js`)
- Using `Object.create(Geolib.prototype)` instead of object literal `{}`
- New folder structure: compiled `geolib.js` can now be found in `dist/` instead of root dir
- Improved Grunt build task