geolocation latitude and longitude

Geographic location in China: The intersection of Heilongjiang and usuli River at 2 minutes 30 seconds, 135 degrees, on the Eastend east longitude The west end of the eastern longitude 73 degrees 40 minutes Pamir uzbiri mountain exit (ucha County) At the southernmost point of the islands, the northern latitude area is 3 degrees 52 points, and the former mother sa

This article introduces how to use javascript to extract the coordinates of the administrative region boundary longitude and latitude from AMAP and Baidu. This article is highly practical and easy to understand. For more information, see. Using JavaScript to extract the coordinates of longitude and latitude of administ

Transfer (http://www.findingchina.info/article/gps/2009-10-10/108.html) Preface: for some purpose that few people do not know the truth, the electronic map (including GPS navigation software) of tianchao abolished the function of displaying the longitude and latitude of the current position. This is a good opportunity for a few G-friends who wish to freely share accurate locations, a few outdoor enthusiasts

//Earth radius, with an average radius of 6371 km /*** Calculate the four points of a square with a distance between a certain latitude and longitude ** @ Param Lon float longitude * @ Param lat float latitude * @ Param distance float the radius of the circle where the point is located, this circle is tangent to this s

Example One function distance ($lat 1, $lng 1, $lat 2, $lng 2, $miles = True){$pi = m_pi/180;$lat 1 *= $PI 80;$LNG 1 *= $PI 80;$lat 2 *= $PI 80;$LNG 2 *= $PI 80;$r = 6372.797;$dlat = $lat 2-$lat 1;$DLNG = $lng 2-$LNG 1;$a = sin ($dlat/2) *sin ($dlat/2) +cos ($lat 1) *cos ($lat 2) *sin ($DLNG/2) *sin ($DLNG/2);$c = 2 * atan2 (sqrt ($a), sqrt (1-$a));$km = $r * $c;Return ($miles? ($KM * 0.621371192): $km);} Example Two /*** Calculate the distance between two coordinates (m)* @param float $fP 1L

Ideas:Formula:W is the radian corresponding to Latitude, and J is the arc of longitude, as shownThe following code lat is latitude LNG is longitude/** * According to Latitude and longitude, return the result unit is kilometer, fir

Abstract: The last chapter teaches you how to establish your own administrative area map. This time to provide you with a visual selection of areas, and can automatically generate latitude and longitude of the Code tool. The source code for the tool is completely public and has a detailed comment. Can be simply as a tool, but also as the Baidu Map API learning case. Tool Description: 1, switch can be contr

function Getdistancebetweenpointsnew ($latitude 1, $longitude 1, $latitude 2, $longitude 2) { $theta = $longitude 1-$longitude 2; $miles = (sin (Deg2rad ($latitude 1)) * S

Find a specific address based on latitude and longitude:Http://api.map.baidu.com/geocoder?location= latitude, longitude output= output format type key= user keySuch as:http://api.map.baidu.com/geocoder?location=31.407452,121.490523output=jsonkey= 6eea93095ae93db2c77be9ac910ff311Find the latitude and

The applet provides an example of obtaining the longitude and latitude coordinates of its own location. This article describes how to use a applet to obtain the longitude and latitude coordinates of its location. We will share this with you for your reference. The details are as follows: 1. Effect display 2. Key c

Because the GPS signal positions are longitude and latitude spherical coordinates, the State cannot directly reference them from a security perspective. Therefore, kailide gridded the coordinates of longitude and latitude to facilitate the navigation of the navigators, each grid unit represents a vertical direction of

This article is mainly to share under the map region based on the creation of two-dimensional latitude and longitude array, the need for friends can come to referenceAfter the last article, based on the map area, the corresponding point of the display area is calculated.Changes in Latitude: XY page display, from left to right dimension is added such as: 106, 107,

Latitude algorithm $pi80 = m_pi/180; $lat 1=34.7465763; $lng 1=113.65778739999996; $lat 2=34.684795; $LNG 2=112.43594499999995; $lat 1 *= $pi; $LNG 1 *= $pi; $lat 2 *= $pi; $LNG 2 *= $pi; $r = 6372.797; Mean radius of Earth in miles $dlat = $lat 2-$lat 1; $DLNG = $lng 2-$LNG 1; $a = sin ($dlat/2) *sin ($dlat/2) +cos ($lat 1) *cos ($lat 2) *sin ($DLNG/2) *sin ($DLNG/2); $c = 2 * atan2 (sqrt ($a), sqrt (1-$a)); $km =round ($r * $c, 2);//return

By latitude, the database is compared stringbuffer SB = new StringBuffer () sb.append ("Select TimeKey,") Sb.append ("ROUND (6378.138*2*asin ( SQRT (POW (Sin (*pi ()/180-lat*pi ()/180)/2), 2), Sb.append (+cos (? *pi ()/180) *cos (Lat*pi ()/180) *pow (Sin ((? *pi ()/) ); Sb.append ("180-lng*pi ()/180)/2), 2)) *1000) as JL") Sb.append ("From T_news have JL Mysql takes a distance comparison between the specified lati