gps latitude and longitude
Let me talk about data representation. Generally, the data obtained from GPS is latitude and longitude. There are many ways to express latitude and longitude.
1.) ddd.ddddd, decimal fraction of degrees. Degrees (5 digits)
2.) Ddd.mm.mmm, decimal fraction of degrees, minutes and minutes (3 digits)
3.) ddd.mm.ss, degree.minute.second. Not all GPS have these kinds of display, GPS315 can only choose the second and third
In the LAT / LON coordinate system, the latitudes are evenly distributed, with a total of 180 latitudes from the South Pole to the North Pole. The diameter of the earth is 12756KM, and the circumference is
12756 * PI, a latitude is 12756 × PI / 360 = 111.133 KM (inaccurate).
This is not the case with longitude, only when the latitude is zero, that is, on the equator, the distance between one longitude is 111.319KM, and as the latitude increases, the distance becomes closer and closer, and finally meets the north and south poles. Think about it, yes. Therefore, the unit distance of longitude is closely related to the latitude where the longitude is determined. The simple formula is:
Longitude 1 ° length = 111.413cosφ, at latitude φ. (The formula is not precise)
Example: Beijing has a longitude of 119 degrees and a latitude of 40 degrees. What is the unit longitude and unit latitude?
Answer: Unit latitude 111.133KM unit longitude 111.413 × COS 40 = 85.347KM
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