Calculation of the distance (km, meters, mile, foot) between two point in the earth, is possible calcolate the bearing angle between the points and the destination point with start point, distance and bearing.

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[-]deg.dddddd , [-]deg.dddddd     coordinate location 41° 53´ 25.008" N 12° 29´ 32.928" E
[-]deg.dddddd , [-]deg.dddddd     coordinate B 40° 46´ 4.8" N 73° 57´ 57.6" W
distance	km mi
bearing	° degrees

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Contents

  Format

  Calculating the distance between two geographical points

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Format

Value range

   Valid value for the latitude are from -90.0° to 90.0° for the longitude are from -180.0° to 180.0°, the + sign should be omitted, while the minus sign is not necessary if there is a radio component to select the direction N-S or W-E (Degree and Decimal format).

Decimal

   You have to select a direction (N-S or W-E) and insert a number from 0 to 90 for the latitude or from 0 to 180 for the longitude (example 45.12345).

Degree

   Degree format is conposed of direction (N-S or W-E) and three sets of numbers separate by the symbols for degrees (°), minutes (’), and seconds (").
   Degree is a integer value without sign, from 0 to 90 for the latitude or from 0 to 180 for the longitude. Minute is a integer value without sign, from 0 to 59. Seconds is a double value without sign, from 0 (or 0.0000) to 59.9999 .

Coordinates

   Coordinates format is the pair of latitude and longitude, with sign minus (-) for the direction south latitude and west longitude separate by comma simbol (,), here some example:
     52.5163 , 13.3779
     40.7682 , -73.9816
     -22.9708 , -43.1830

Search on map

   Click on search to open the webpage Earth Coordinate, here you obtain the latitude and longitude simply by clicking on the map, and save the value by the button save.

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Calculating the distance between two geographical points

The formula used to determine the shortest distance between two points on the land (geodesic), approximates the geoid to a sphere of radius R = 6372.795477598 km (radius quadric medium), so the calculation could have a distance error of 0.3%, particularly in the polar extremes, and for long distances through various parallel. Given two points A and B on the sphere expressed by latitude (lat) and longitude (lon) you will have:

distance (A, B) = R * arccos (sin(latA) * sin(latB) + cos(latA) * cos(latB) * cos(lonA-lonB))

The angles used are expressed in radians, converting between degrees and radians is obtained by multiplying the angle by pi and dividing by 180.

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Comment

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