How are ground overlays used in Google Maps?
In contrast, ground overlays are useful when you wish to fix a single image at one area on the map. You can also use transparent tile overlays to add extra features to the map, by setting a transparency factor on the tile overlay programmatically or by providing transparent tile images.
How are the tiles indexed in Google Maps?
Tiles are indexed using x,y coordinates from that origin. At zoom level 0, the entire world is rendered in a single tile. Each zoom level increases the magnification by a factor of two. So, at zoom level 1 the map will be rendered as a 2×2 grid of tiles. At zoom level 2, it’s a 4×4 grid. At zoom level 3, it’s an 8×8 grid, and so on.
How many DP’s do you need for Google Maps?
When creating images for a tile layer, you will need to create an image for each tile at each zoom level that you wish to support. Google Maps targets 256 dp (device-independent pixels) when displaying tiles. For high resolution devices, it is recommended that you return high dpi tiles (512×512 px).
What does minimum zoom mean on Google Maps?
For example, a satellite or terrain map may have a lower maximum zoom level than the base map tiles. GoogleMap.getMinZoomLevel () returns the minimum zoom level, which is the same for every location (unlike the maximum zoom level) but may vary between devices and map sizes.
How are the tiles arranged in Google Maps?
The Google Maps API breaks up the imagery at each zoom level into a set of square map tiles arranged in a grid. When a map moves to a new location, or to a new zoom level, the Maps API determines which tiles are needed and translates that information into a set of tiles to retrieve.
What do you need to know about tile overlays?
A TileOverlay defines a set of images that are added on top of the base map tiles. You need to provide the tiles for each zoom level that you want to support. If you have enough tiles at multiple zoom levels, you can supplement Google’s map data for the entire map.
How to create custom overlays in maps JavaScript?
The Maps JavaScript API provides an OverlayView class for creating your own custom overlays. The OverlayView is a base class that provides several methods you must implement when creating your overlays. The class also provides a few methods that make it possible to translate between screen coordinates and locations on the map.