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What is a zoom level?
Leaflet works with latitude, longitude and “zoom level”. Lower zoom levels means that the map shows entire continents, while higher zoom levels means that the map can show details of a city. To understand how zoom levels work, first we need a basic introduction to geodesy.
What is a zoom slider?
Zoom Slider is the name of a web-based slideshow utility, written purely in the JavaScript language programming. This slideshow feature enables you to zoom in and out, insert HTML captions for images, view thumbnail images, and use navigation controls.
What ratio scales do Google Maps zoom levels correspond to?
Google Maps shows a 1km ruler (bottom left of the map) which is 90 pixels in length, at zoom level 13. Which means the following: Assuming the screen resolution is 96 dpi or 36 dpcm, at zoom level 13 we have 0.4km (from 36/90) in 1cm, which yields map scale of 1:40,000 for a 96dpi screen.
What’s the maximum zoom on a slippy map?
Zoom levels. The zoom parameter is an integer between 0 (zoomed out) and 18 (zoomed in). 18 is normally the maximum, but some tile servers might go beyond that.
How to calculate the optimal zoom-level to..?
If you are using OpenLayers then Map.getZoomForExtent will calculate the highest zoom level that can fit the entire extent on the map. The extent needs to be in the map’s projection. You can also use a fill_factor to avoid displaying points on the edge of the map, and max_zoom to limit the possible zoom:
How to calculate the optimal zoom level in OpenStreetMap?
Get distance between your two points in spherical mercator. The equator is about 40m meters long projected and tiles are 256 pixels wide, so the pixel length of that map at a given zoom level is about 256 * distance/40000000 * 2^zoom.
What are the tile numbers on the slippy map?
The slippy map expects tiles to be served up at URLs following this scheme, so all tile server URLs look pretty similar. 5.24.1 Tile numbers to lat./lon.