exact location longitude latitude

DoubleConvertradianstodegrees (Doubleradian) { returnRadian *180.0/Math.PI; } }}The origin of the formula:Versine (f) =1-cos (f)The origin of Haversine's name is Ha-versine, or half-versine, which means half of sin.Hav (a) = (1-cos (a))/2 = sin (a/2) * sin (A/2)Demolition Process:such as the next circle with a radius of 1, O is the center of the Circle, A, B is the chord (chord). Angle Aob=theta. The angle AOC=THETA/2. OC is perpendicular to AB's vertical line (perpendicular). The

." In the east of it is longitude, a total of 180 degrees, the west of it for the western longitude, a total of 180 degrees. Because the earth is round, the longitude of 180 degrees east longitude and longitude 180 degrees West is the same meridian line. The 180-degree merid

This article mainly introduces about PHP according to latitude and longitude sorting, according to latitude and longitude to filter the distance segment, has a certain reference value, now share to everyone, the need for friends can refer to SQL statements: Select Location.

in the suburbs of London by longitude as the starting point for the calculation of longitude, that is, latitude of 0 minutes and 0 seconds, also known as the "Prime Meridian." In the east of it is longitude, a total of 180 degrees, the west of it for the western longitude,

Baidu Map provides a range of search capabilities, but it uses Baidu's own data, but sometimes we need to use their own data, displayed on the map. For example, given two parameters: Specify a location (latitude and longitude Lnglat at one point) and search radius (r) to search for data in the specified range. There are three basic ways to solve this requirement:

, a (Lat1,lon1) and B (Lat2,lon2) are 2 points of interest to us. 2 The Longitude line lon1,lon2 intersects the Arctic (North Pole) N. The line where EF is located is the equator (equator). The ACBD is a four vertex (vertice) of the isosceles trapezoid on the plane. The strings of AC and db (straight lines) are not drawn on the graph. The CD location is: C (lat2,lon1) and D (Lat1,lon2). The angle AOC is the

equator vertical big circle, this is called "The Warp Circle";The line of the circle is called the Warp. Year 1884, the International rules of the Greenwich Observatory in the suburbs of LondonLongitude as the beginning of the calculation of latitude, that is, longitude zero 0 minutes and 0 seconds, also known as the "Prime Meridian." East of it for longitude, a

longitude and latitude as hash. The question is rough. I can only tell you about my method in general, and I have done something similar.1. Store the merchant's location information in segments according to the city,2. the browser obtains the user location and uses Baidu's map js api.3. Calculate a rectangle center

the Antarctic point, can draw many north-south direction and the Earth's equator vertical big circle, this is called "The Warp Circle";The line of the circle is called the Warp. Year 1884, the International rules of the Greenwich Observatory in the suburbs of LondonLongitude as the beginning of the calculation of latitude, that is, longitude zero 0 minutes and 0 seconds, also known as the "Prime Meridian."

direction of the Earth's equator perpendicular to the large circle, known as the "Warp Circle"; the segments that make up these circles are called meridians. Year 1884, the International rules of the Greenwich Observatory in the suburbs of London by longitude as the starting point for the calculation of longitude, that is, latitude of 0 minutes and 0 seconds, al

point, can draw many north-south direction and the Earth's equator vertical big circle, this is called "The Warp Circle";The line of the circle is called the Warp. Year 1884, the International rules of the Greenwich Observatory in the suburbs of LondonLongitude as the beginning of the calculation of latitude, that is, longitude zero 0 minutes and 0 seconds, also known as the "Prime Meridian." East of it fo

equator vertical big circle, this is called "The Warp Circle";The line of the circle is called the Warp. Year 1884, the International rules of the Greenwich Observatory in the suburbs of LondonLongitude as the beginning of the calculation of latitude, that is, longitude zero 0 minutes and 0 seconds, also known as the "Prime Meridian." East of it for longitude, a

GPS is converted into a hundred degrees longitude and latitude, and gps is converted into Baidu longitude and latitude Recently, Baidu's api is used for map positioning. Baidu's background sometimes stops to obtain the longitude and lat