What is OpenLayers projection?
What is OpenLayers projection?
What projection is OpenLayers using? Every map that you’ll create with OpenLayers will have a view, and every view will have a projection. If you do not explicitly set one, your map is going to use our default which is the Web Mercator projection (EPSG:3857).
Is it LAT LON or Lon Lat?
2 Answers. You are correct, there is no universal standard on the order: In mathematical functions which do an universal conversion, between x,y or lon,lat or inverse, the lon,lat order should be used, because the x-axis relates to longitude and y to latitude and the x,y order is usually preferred.
What is the formula for longitude and latitude?
Distance
| Haversine formula: | a = sin²(Δφ/2) + cos φ1 ⋅ cos φ2 ⋅ sin²(Δλ/2) |
|---|---|
| c = 2 ⋅ atan2( √a, √(1−a) ) | |
| d = R ⋅ c | |
| where | φ is latitude, λ is longitude, R is earth’s radius (mean radius = 6,371km); note that angles need to be in radians to pass to trig functions! |
What projection does OSM use?
Pseudo-Mercator projection
Spherical Pseudo-Mercator projection Most of OSM, including the main tiling system, uses a Pseudo-Mercator projection where the Earth is modelized as if it was a perfect a sphere. Combined with the zoom level, the system is known as a Web Mercator on Wikipedia.
Does Lat or Lon come first?
When you see a pair of coordinates and can’t remember whether latitude or longitude comes first, think about alphabetical order to remember. Latitude comes first in alphabetical order and it also is the first coordinate in a set. Longitude is the second coordinate in the set.
Is Google Maps Lat Long or Long LAT?
Google Maps accepts latitude and longitude in any of the three common formats; use whichever one is most convenient: Degrees, minutes, and seconds (DMS): 34° 7′ 8.904” N 118° 18′ 1.296” W.
How do you calculate longitude?
The Earth rotates one full turn (360º of longitude) in one day. It therefore turns one degree of longitude in 1/360th of a day, or every four minutes. To calculate your longitude, you therefore simply need to work out the time difference between noon at your location and noon at the Prime Meridian.
How to create a new openlayers.lonlat object?
{ OpenLayers.LonLat } New OpenLayers.LonLat object built from the passed-in String. Alternative constructor that builds a new OpenLayers.LonLat from an array of two numbers that represent lon- and lat-values.
How to create a geometry in openlayers.geometry?
A Geometry is a description of a geographic object. Create an instance of this class with the OpenLayers.Geometry constructor. This is a base class, typical geometry types are described by subclasses of this class.
What is the latitude and longitude in OpenLayers?
If your map is in a geographic projection, this will be the Longitude. Otherwise, it will be the x coordinate of the map location in your map units. {Number} The y-axis coordinate in map units. If your map is in a geographic projection, this will be the Latitude. Otherwise, it will be the y coordinate of the map location in your map units.
How to calculate the length of an object in OpenLayers?
{ |Object} OpenLayers.LonLat or an object with a ‘lon’ and ‘lat’ properties. Calculate the length of this geometry. This method is defined in subclasses. Calculate the area of this geometry. This method is defined in subclasses.