Quadkey map

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I have a number of tile sources which utilise Bing Maps' Quadkey system in an old Silverlight application and I would like to use them in a new Openlayers 3 map.

I have found several examples of functions which will convert these sources for Leaflet. Can anyone provide an example of this type of conversion or indeed does anyone know if the latest 3.

Any insight would be appreciated as I've trawled many forums and countless pages of search results without finding a solution. The issue that might arise is understanding the ol. TileCoord provided to the URL function. In OpenLayers 3. Furthermore, both the X and Y coordinates increase naturally, so that the X and Y coordinates of a TileCoord corresponds to the normal concepts of a two-dimensional axis. Some mapping applications, such as Bing, also use the top left corner as the tile origin, but lets the Y coordinate increase downwards.

In order to calculate the quadkeys, the Y coordinate has to be inverted and adjusted by one. This should work :. Learn more.

Venue Maps API

Asked 4 years, 7 months ago. Active 4 years, 7 months ago. Viewed 1k times. So you want to use quadkeys to fetch tiles from other sources than Bing, right? Basically yes. All of the urls are encoded as per the second example and I've been reading up on creating a custom build of OL3 as I'm unsure whether the latest release has the ol. TileUrlFunction and ol.

I don't recognise the tilePoint or Util. AlvinLindstam, can you possibly help me to understand the ol. TileUrlFunction and how it might apply here?The idea is to store a geo-database such that data for a specific location can be retrieved quickly, by dividing the data up by location, partitioning the world into tiles. Note that we use the word tiles a lot in OpenStreetMap, and in fact we're normally talking about tiled map images, that's not really what this page is about although a QuadTile data indexing scheme has some similarities with Slippy map tilenames.

Note: the QuadTiles indexing stragy is analog to Geohash algorithmas commented here. If we split the world into 4 tiles, level 1 of zoom then we would need 2 bits to give a tile address topleft, topright, bottomleft, bottomright. Each of those tiles would be about 20,km in size. This is obviously too big to be practical, so we would need to split it into smaller tiles.

quadkey map

Adding 2 more bits, we have 10,km tiles zoom level 2 - better, but still way too big. But of course, we can do this as much as we like. By the time we get to 32 bits zoom level 16our tiles are about m in size. The smaller tiles that you have, the more bits are required to address them. Also the smaller the tile, the more segment traversals are likely, and the more space will be used.

But too big, and each tile will contain more information than the user requires, and could be a vast amount of data e. A quadtile is a recursive addressing scheme for 2 dimensional space, that is particularly useful in uneven datasets.

Instead of partitioning our bit address bitspace into, say, a tile address of. We have thus substituted 2-d ranged coordinates x,y for a single address. As we read the address from left to right, we are steadily becoming more specific about the location. He has also changed the indexing of the main database to speed up core Protocol requests, by indexing node locations by quadtile. This particularly improved the efficiency of API operations which fetch a bounding-box of data.

The result was a dramatic improvement in overall server performance. FIXME: Need more technical details on what is actually implemented as opposed to the ideas on the rest of this page. Although we are now using quadtiles, it is not clear whether we are actually indexing tile intersections in this way.

Are we just indexing node positions at the current time?GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Includes a TileIndex that can be used to aggregate data into parent tiles. The TileIndex allows for data to be indexed by tiles and aggregated up to their parents when requested.

Here are some microbenchmarks for converting a location at zoom level There's nothing really to compare them to, but should give a sense of op time on a 2.

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FromCoordinate Add esb, "EmpireStateBuilding" idx. Add sol, "StatueOfLiberty" idx. Println "ESB Tile: ", idx. Values esb fmt. Println "SOL Tile: ", idx. Values sol fmt. Println "NYC Tile: ", idx. Benchmarks Here are some microbenchmarks for converting a location at zoom level You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Most notably, navigating the map using touch works much better in Windows 8 than it did before.

This update also increases the number of supported cultures from 15 to and aligns with the same cultures supported by the Bing Maps Windows Store SDK which are documented here. One new feature is the ability to have a lot more control over tile layers. In the past tiles for a tile layer had to be hosted on a server in order to load them into the WPF map control.

Now you can extend the TileSource class and load in tiles from local storage or generate them right in code. In this blog post we are going to take a look at how we can create a custom tile source that loads tiles from a local folder. The first method is to download the SDK from here. Once this is done you can right click on your project name and select Add Reference. Typically, the control is installed in the Program Files or Program Files x86 folders on the drive that contains your operating system.

Open the Libraries folder and select the Microsoft. This class will extend from the TileSource class. When creating an instance of this class we will have the user specify the path to where the tiles are stored. Putting this together the class looks like this: using Microsoft. WPF; using Microsoft. Core; using System; using System. Generic; using System. IO; using System. Media; using System. Imaging; namespace LocalTileLayer. These properties define the position of the tile to render.

Another common way of defining the position of a tile is using a quadkey value. A quadkey value is a base-4 number where the number of digits is equal to the zoom level of the tile, and the numbers specify the where on the map the tile is.

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The benefit of using quadkey values is that it is a single value that identifies a tile. Details on how quadkeys are documented here. Since both methods of identifying a tile are commonly used we will make sure the TileRender method handles both of these by replacing the relevant properties in the tile path string and then loading the image from the path.

Update the TileRender method with the following code:. Next we will add the CreateTransparentTile method. This method will return a transparent BitmapImage that is the same size as a standard tile. Add the following code to the LocalTileSource class. Implementing the custom TileSource To get started we need to add a map to the app. Open the MainWindow. You can either create your own tile layer with MapCruncher or download the source code for this project and grab the tiles from there.

Create a folder in the project called SouthendUniversityHospital and copy all the tiles to it. Select all the tile images in this folder, right click and go to Properties. When the map loads we will add a tile layer to it that makes use of the LocalTileSource class we created and points to our tiles.

Update the code to look like this:. If you build and run the application you will see the map loads over a hospital in Essex, UK and renders a custom tile layer, that is hosted locally, over top the map. In this blog post we have seen how to you can extend the TileSource class in the Bing Maps WPF control so that it loads tiles from local storage.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

It only takes a minute to sign up. I have a number of tile sources which utilise Bing Maps' Quadkey system in an old Silverlight application and I would like to use them in a new Openlayers 3 map. I have found several examples of functions which will convert these sources for Leaflet. Can anyone provide an example of this type of conversion or indeed does anyone know if the latest 3. I asked the question a little differently in another post and my question was answered completely although I'm still unable to access the url in question.

For anyone else that may need to know I'm posting the link here and marking this question as answered. Bing Maps is already available in Open Layers 3. Sign up to join this community.

The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 7 months ago. Active 4 years ago. Viewed 1k times. Active Oldest Votes.

Good question, although cross posting is discouraged at Stack Exchange meta. Furthermore, link only answers are discouraged meta. Apologies Aaron, I've amended my answer to incorporate the code in the other post.

It wasn't my intention to cross-post although my first post earned a tumbleweed badge I think so I tried to ask another, clearer question.

I was new to the forum at the time and a little unfamiliar with the etiquette. In this instance I was just trying to close an unanswered question and prevent anyone else responding. Thanks rbrunditt. Long story short, I have to access a series of tiles that have been cut as Bing and need to be accessed via Quadkey. I've come to realise that what I need to know is either how a getTileUrlFunction could be used to do this or how I could extend the ol.

Bingmaps to pass in another url? Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.Visual Business then requests the URL resource and places the resulting tile on a canvas.


The url template should contain tokens for the various parameters expected by your map provider. Depending on the tokens present, Visual Business will calculate various values for replacement. The table below summarises this flow logic. A quadkey is a standard way to code the position of a tile on a squared picture of the earth in our case. The algorithm splits the picture into 4 squares, where '0' represents the left upper square, '1' the right upper, '2' the left lower and '3' the right lower square.

So a quadkey '0' represents the tile with the North West part of the world picture an empty quadkey '' represents the complete picture, btw. Further continuing this process and further adding the square digits to the quadkey leads to quadkeys for even smaller tiles. In the end the length of the quadkey is equivalent to the level of detail, a tile on LOD 3 is consequently always 3 digits long of course it is not possible to cut off leading 'zeros'. As shown above a quadkey is a string with length LOD containing a sequence of the digits "0","1","2" and "3".

As only 4 different digits are used this representation is hardly optimal in sense of size. To improve that it is also possible to use a variant of the quadkey which converts the string to a integer number.

This is shorter but rarely used. Some map providers require the position plus the level of detail to be transfered. The usage is straight forward and self-explaining. Another possibility is the specification of the left uper corner point together with the opposite point. Speaking in other words the LOD need not to be a whole number here. When the single picture mode is used, it is no more sufficient to specify the coordinates as the map provider has to be aware of the extensions of the picture.

A standard tile is assumed to be x, when we request a picture containing a 8x8 square of tiles we consequently request a picture with height and width of This is done according to the following scheme:.

The above example for specifying the left upper and right lower corner points expect an x value between Some providers use a different coordinate system, For example we found one map provider, which is using a to range.

The y range is in fact to as the southern regions are not supported by the map, but theoretically the south pole is still on But getting back to the projection.

To trigger a transformation from [ The base is valid for all sources. Additionally to the base itself a rounding parameter has to be provided to specify the number of digits which have to be parsed to the URL. Some map provider accepts only integer values, so we have to round to zero digits.

SAP Visual Enterprise. Browse pages. A t tachments 0 Page History. Dashboard Visual Business Topics.Specifying the grid location of a map tile in terms of zoom level, column and row as described under The Mercator Projection is easy to understand and intuitive in practise.

However, the grid is a two-dimensional array and as such does not offer efficient storage and retrieval. A better solution is a one-dimensional array, where each item is uniquely addressable by a single value. This is made possible by quadkeys, which combine the zoom level, column and row information for a tile in a one value. In fact, a quadkey is a string containing a numeric value.

Bing Maps Tile System

The value is obtained by interleaving the bits of the row and column coordinates of a tile in the grid at the given zoom level, then converting the result to a base-4 number the leading zeros are retained. For example, we can obtain the quadkey for a map tile in column 3 and row 5 at zoom level 5 as follows:.

The code below shows a JavaScript implementation of the algorithm that calculates quadkeys.

quadkey map

The inputs are the coordinates of the a map tile and the zoom level. The return value is a string containing the quadkey. The lower part of the code block shows the function called to calculate a quadkey for zoom level 16, which is also the length of the output string shown on the last line. Note that when using a quadkey address, you cannot specify the size or format of the map tile image.

The response always includes an image that measures x pixels and the format is png Products Products Location Services. Solve complex location problems from geofencing to custom routing.

quadkey map

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