calculate distance between coordinates

PHP calculates the distance between two coordinates (longitude, latitude) and returns the result as meters or kilometers 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; Mean radius

In Baidu Map, how to search for N coordinate points nearby in the database based on a coordinate point: some coordinate points (more than W) are stored in the existing php + mysql database, what if I used a coordinate point to obtain all the matching information within 1 km? The lng latitude field lat in the longitude field of the database .. Baidu map is used. Online, etc. thank you ., Sorting coordinate columns filter records with Euclidean distance

Tags: sql set Jingwei def float body ble fine funcDELIMITER $$CREATE definer = current_user FUNCTION ' getdistance ' (' lon1 ' float, ' lat1 ' float, ' lon2 ' float, ' lat2 ' float)RETURNS DoubleBegindeclare d double;declare radius int;Set radius = 6378140; #假设地球为正球形 with a diameter of 6378140 mSet D = (2*atan2 (SQRT (SIN (LAT1-LAT2) *pi ()/180/2)*sin ((LAT1-LAT2) *pi ()/180/2) +COS (Lat2*pi ()/180) *cos (LAT1*PI ()/180)*sin ((Lon1-lon2) *pi ()/180/2)*sin ((Lon1-lon2) *pi ()/180/2)),SQRT (1-sin

Topic Link: Click to open the linkTest instructions4 points on a given two-dimensional coordinateAsk:Find a point to make this point distance from 4 points and the minimumOutput distance and.Ideas:If 4 points are not convex 4-edged. Must be the optimal endpoint.Otherwise, the intersection of 2 diagonal lines is optimal, can be simply proved.For a convex 4-edged shape, sort the first corner.#include Uvalive

givenn points in the plane that's all pairwise distinct, a" boomerang "is a tuple of POINTSNBSP; (I, J, K) such that the distance between i and j equals the distance between i and k ( the order of the tuple matters ). Find the number of boomerangs. Assume that n would be is at most and coordinates of points is all in the

After reading the latitude and longitude distance between two points, it is said that it was obtained from Google. Algorithm So I decided to verify it. East to west to a VB Code Is found to be correct through computation. The two coordinate points 30,120 and 31,121 are used for verification, which is very similar to the calculation result in MapInfo. Later, we calculated the coordinate system directly as a Cartesian coordinate system, and found that

, minimum latitude and longitude minlng, Minlat, MAXLNG, Maxlatreturns> Public Double[]Getaround (DoubleLngDoubleLatintRaidus) { //The circumference ofThe Earth is -,901miles. // -,901/ the = 69.17Miles/degreeDoubleLatitude=lat; DoubleLongitude=LNG; DoubleDegree=(24901 * 1609)/ 360.0;//the perimeter of the earth is 24901 miles.DoubleRaidusmile=Raidus; //Calculate latitude FirstDoubleDpmlat= 1 /degree; DoubleRadiuslat=Dpmlat*Raidusm

. Then use the Map API to get the latitude and longitude, and then what I don't know. Want to know the great God to give me advice, thank you! This database to choose a native support Geo, MongoDB is a good choice.Another: Mysql 5.7 also joins native support for GeoIn this business, the writing of latitude and longitude, the code logic of the query is the most important, the distance can be calculated by latitude And then a big chunk of business log

This article describes how to search for a geographical location in PHP and how to calculate the distance between two geographical locations. The example of a geographical location search uses the MongoDB database. For more information, see Geographic location searchLBS stores the longitude and latitude coordinates of each location, searches for nearby locations,

', coordinates: [113.323568, 23.146436] }, $maxDistance: + } } Search results: Copy the Code code as follows: {"_id": ObjectId ("556a651996f1ac2add8928fa"), "loc": {"type": "Point", "coordinates": [113.330611, 23.147234]}, " Name ":" Forest and West "} The PHP code is as follows: To demonstrate PHP code, you first need to create users and execute auth in MongoDB's l

Class mynodevisitor: Public OSG: nodevisitor { Pulic: Mynodevisitor (): OSG: nodevisitor (OSG: nodevisitor: traverse_all_children) {} Void apply (OSG: geode geode) { // Calculate the world transformation matrix corresponding to the current geode node, used to calculate the world coordinates corresponding to the vertex in geode OSG: matrix geodema

Sometimes, after zooming, you need to know which coordinates the zoom is to begin with. As the point of the last known zoom, then zoom to it at that point. This article is actually inverse(x, y) is the point at which the zoomSimple after simplification, the code is as follows: Func Getzoompoint (fromrect:cgrect,torect:cgrect),cgpoint{ = torect.width/ fromrect.width = (Torect.origin.x-scale * fromrect.origin.x)/(1.0 -scale ) =

transparent The problem is that the uiscollview is hidden by default to slide down to display the cursor. ... Two problems need to be solved to control the display position of the cursor by yourself. The first is to know the coordinates of the cursor, and the other is how to control uiscollview scrolling first. It is difficult to calculate the coordinates of the

Example of how to calculate the sliding distance of a touch event on a JS mobile phone, jstouch This article describes how to calculate the sliding distance of a JS Mobile Phone touch event. We will share this with you for your reference. The details are as follows: Calculate