![]() ![]() You can also enter the name of the location that you are looking for in the search bar. Now, just use the native feature of the map to zoom in to any location of your choice.You can see that the website is based on Google Maps with its added layers to draw a radius on the map. Firstly, just go to the official website of Map Developers circle tool on any supported browser like Google Chrome.One of them is Map Developers that is based on Google Maps and has simply provided a solution to draw a radius on the map. Therefore, to draw a radius on Google Maps, you would have to use an application that has its own interface. Presently, the native feature of Google Maps does not have a distance radius tool. Though, there are times when users like to draw a radius on Google Maps for a particular location. You might already know that Google Maps provides a map of the entire world for us to navigate. The displayed Map is characterized by its own pixel width.Part 1: Draw a Radius Circle on Google Maps Check it against any to the tables posted here and the numbers will match.īased on all the info provided, I have built a function that gives the best z applied to a map when you want to have a horizontal line that represents N% of the displayed Map. I have used this hundred of time and overlaying it with actually field survey data and its always been correct. If you want feet divide that 0.3048Īs for sources I essencial reversed engineer about 5 years ago from various bit of info and documentation I found on the web including Google and MS mapping support sites. If you screen capture a 1000 x 1000 pixel image of that area the dimension are 105.56 meters square. That is the length and height of one pixel from an image at latitude 45 at zoom level 20. Now lets say our image is at latitude 45. Lets say I have an image at zoom level 20 (as zoomed as they currently let you get) Take 0.009330692 (Zoom 24 at equator) double it for zoom 23, again for zoom 22, again for zoom 21 and one last time for zoom 20. Now for an example of how to use the above data. ![]() Why this is level 24 was chosen I don't know however as someone else here worked out 0 gets you down to one 256 pixel tile for the earth. 32 bit integers are also efficient to store and process. ![]() This is a logical choice as it yields global accuracy to about one centimeter which is plenty for aerial imagery. They then took that and divided it by a full 32 bit integer. (note in a previous post someone used a value of 40,075,160 I've seen this in Wikipedia a few places and it's incorrect. So back 15-20 year ago someone took WGS-84 as base data. What you need for these images to be used with any accuracy is to know the dimension of each pixel then scale the image according to whatever your overlaying it with. Scale ratios are relative to printed documents not computer screens. Well its not really a legitimate question to start with. Unit at Latitude = (Cosine of Latitude) X (Unit at Equator) Zoom level 24 uses 2 to the 32 power (4,294,967,296) pixels at circumference.Įquatorial Circumference / 2 32 =.
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