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Let's take a look at the map projection used by Google Maps. Google Maps,Virtual EarthMap projection used by network geography is often calledWeb MercatorOrSpherical MercatorThe main difference between it and conventional mocato projection is thatSimulate the Earth as a sphere rather than an elliptical body. For more information about why projection is required

The following code uses the Google map API to obtain the distance between vertices () The Code is as follows: Var request;Var distanceArray = [];Function getdistance (){DistanceArray = [];Var directionsService = new google. maps. DirectionsService ();For (var a = 0; a For (var B = 0; B If (! = B ){Request = null;Request = {Origin: pointsArray [a],Destination:

These two articlesArticleI don't know when I downloaded it. I never watched it on the desktop, but I finally watched it after years of boredom, together, I realized that "what else do we do for Google? (Webmap direction) "in general, I was angry after reading these two articles, so I am also sad to write an article with such titles, because Google is so powerful that we feel that we have nothing to do, and

Since Google releases place pages The location information is changed from a pop-up tag (bubbled tab) to a separate page. Google's target is one place one page. Now Google goes further and places place pages in the search results. This is quite controversial because each place page has at least one URL, which means it is possible to be indexed by a search engine, this location will be placed fir

Google Maps enhances the display of rental and sale information. You only need to select "Real Estate" on the "more" tab and follow the target area you are viewing, the property information is displayed on the left tab. You can also query the required property information based on the price and room requirements. More up-to-date: Google social search enters the experimental stage.

Google Map V3 javascript calculates the distance between two markerFor map development, some operations and interactions of marker are most commonly used. A brief introduction is the distance calculation between two marker.Google map api is very convenient, as long as it is commonly used, there are basically interfaces

Use the Google map API to create a map for a project. Then I studied Google's image access. Algorithm It is not very difficult. Let's take a look at our school chart. Google Maps and Google Earth each level of each image has a URL, for example, the following figure of our s

Subject. Assume that Baidu coordinates are (x, y). In iOS-based Baidu map development (6), we regard (x, y) as Google coordinates and convert them, after conversion, the coordinates (x1, Y1) are obtained ). Then the calculation method of the real Google coordinates (X2, Y2) is: X2 = 2 * X-x1; Y2 = 2 * Y-Y1; Note: 1. The conversion result is very similar to t

In order to successfully apply for the android map API key, you must prepare a Google account and System Certificate. Generally, Google accounts are required to publish keys on Google. Google accounts are common and Gmail accounts are acceptable. A program must be issued wit

First, the preparatory workinstall water by note Universal Map Downloader, if not installed the software, you can Baidu "water by note software" to the official website download. To install global Mapper, the version can be 11, 12, 13, 14, 15, or 16, whereGlobal Mapperas an example. Second, download the mapfirst, we need to download the Google satellite map, here

I. mocato projectionGoogle map uses epsg: 900913 standard mocato projection (geo-circular map projection)Y = r * ln (TAN (PI/4 + A/2 ))X = r * BWhen Y is equal to PIR, the projection chart is just a square, and the latitude is 85.05113 degrees. [-85.05113, 85.05113]. The maximum longitude is [-180,180]. The equator length is 6378137 meters, so the maximum edge of the family can be obtained according to the

First, the preparatory workinstall water by note Universal Map Downloader, if not installed the software, you can Baidu "water by note software" to the official website download. Install Supermap, the version can be SUPERMAP GIS series software, hereSupermap Deskpro 6as an example. Second, download the mapfirst, we need to download the Google satellite map, here

Register and use Google map to log on firstHttp://code.google.com/intl/zh-cn/apis/maps/signup.html,The Code obtained after application is added to the webpage. The following is a simple example.Http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd>In the exampleA uses the script tag to include Google map API JavaScript.B.

Compared with ESRI, MapInfo, and the domestic SuperMap, MapGIS, and other GIS platform software, the functions of Google Map APIs may not be worth mentioning, however, google's high-precision satellite image and geographic data can not help but make our eyes shine. Based on Goolge Earth, real-time traffic, 3D street view is even more dazzling. The basic Goolge Map