Contents
Is OSM a map 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.
What is leaflet projection?
This projection is what most slippy tile based maps use, including the common tile sets from Google, Bing, OpenStreetMap, and others. You can easily use this projection in QGIS by selecting “Google Mercator EPSG:900913”. Leaflet has some basic support for displaying maps in other projections.
Why does Google use the Mercator map?
A Google employee explained in 2009 that the company used a Mercator map because it helped preserve angles of roads: “The first launch of Maps actually did not use Mercator, and streets in high latitude places like Stockholm did not meet at right angles on the map the way they do in reality.”
Which is EPSG for leaflet for R-using projections?
The Leaflet package expects all point, line, and shape data to be specified in latitude and longitude using WGS 84 (a.k.a. EPSG:4326). By default, when displaying this data it projects everything to EPSG:3857 and expects that any map tiles are also displayed in EPSG:3857.
Do you have to use WGS 84 for projection in leaflet?
If the custom projection worked correctly, the markers should appear at the same position. While tiles must be in the same projection as used in the leafletCRS function, you must always use WGS 84 longitude/latitude data for markers, circles, polygons, and lines. Leaflet will automatically project the coordinates when displaying.
How to plot OSM polygons using osmdata and leaflet ( in are )?
I am trying to plot buildings from osm using the leaflet-package in R. Unfortunately with little success and I couldn’t find a reproducible example. In a first step, I define the bounding box and add the ‘feature’ building: In a next step, I pass the query to overpass and extract the polygons: Now comes the tricky part.
How to create a projection in leaflet.js?
Once you’ve decided on a custom projection, and have map tiles to match it (if necessary), you can use the leafletCRS function to create a custom projection. The crsClass parameter lets you specify the JavaScript constructor to use to generate the Leaflet.js CRS object.