Contents
Which is the projection method used in OpenLayers?
Projection Methods for coordinate transforms between coordinate systems. By default, OpenLayers ships with the ability to transform coordinates between geographic (EPSG:4326) and web or spherical mercator (EPSG:900913 et al.) coordinate reference systems. See the transform method for details on usage.
Why do I get wrong coordinates in OpenLayers?
If you have set a center in your map view, but don’t see a real change in visual output, chances are that you have provided the coordinates of the map center in the wrong (a non-matching) projection. As the default projection in OpenLayers is Web Mercator (see above), the coordinates for the center have to be provided in that projection.
What is an object transform in OpenLayers 2?
{Object} Transforms is an object, with from properties, each of which may have a to property. This allows you to define projections without requiring support for proj4js to be included. This object has keys which correspond to a ‘source’ projection object.
Why are there so many questions about OpenLayers?
Certain questions arise more often than others when users ask for help. This document tries to list some of the common questions that frequently get asked, e.g. on Stack Overflow. If you think a question (and naturally its answer) should be added here, feel free to ping us or to send a pull request enhancing this document.
How big is the center of view in OpenLayers?
Chances are that your map looks like this: Here [-77.036667, 38.895] is provided as the center of the view. But as Web Mercator is a metric projection, you are currently telling OpenLayers that the center shall be some meters (~77m and ~39m respectively) away from [0, 0].
Is the default view in OpenLayers in Cartesian coordinates?
OpenLayers is designed to handle all projections, but the default view is in projected Cartesian coordinates. It would make no sense to have duplicate functions to handle coordinates in both the Cartesian x,yand lat,lonsystems, so the degrees of latitude and longitude should be entered as though