Coordinate
There are two-dimensional and three-dimensional coordinates. When the GPS can receive signals from 4 satellites or more, it can calculate the local 3D coordinates: longitude, latitude and altitude. If only 3 satellites can be received The signal, which can only compute 2-dimensional coordinates: precision and latitude, may also show altitude data, but this data is invalid. Most GPS can not only display coordinates in latitude/longitude, but also can use UTM (Universal Transverse Mercator) coordinate system to display coordinates but we still use LAT/LONG system, which is mainly by you. The coordinate system of the map used is determined. The precision of the coordinates is when Selective Availability is turned on. The horizontal accuracy of the GPS is between 100-50 meters, depending on the number and strength of received satellite signals. If you have arrived according to GPS instructions, then look around and you should find your target in an area about the size of a football field.
When SA closes, the accuracy can reach about 15 meters. The high degree of accuracy is worse due to the system structure. Latitude and longitude display methods can generally be selected according to their preferences, generally "hddd.ddddd", "hddd*mm.mmm" "," hddd*mm "ss.s" "" (where "*" represents "degree" â€, the same below) The length of the Earth’s meridian is 39940.67 km, and the latitude changes once and for all 110.94 km, one point 1.849 km, one second 30.8 m, the equator is 40075.36 km, the Beijing area is latitude 40 degrees north latitude, and the latitude circle length is 40075 * sin (90-40), the longitude of this place once combined 276 kilometers, a total of 1.42 kilometers a second 23.69 meters, you can select a display, and change the number of a number of meters corresponding to the ground to remember, This will create a rough correspondence between latitude and longitude and actual mileage. Most GPSs have the function of calculating the distance between two points and can give the exact distance between two coordinates. The height of the display will be imperial and metric two ways, into the GPS SETUP page, set to metric system, so that in other speed, distance and other displays will also become metric.
There are two-dimensional and three-dimensional coordinates. When the GPS can receive signals from 4 satellites or more, it can calculate the local 3D coordinates: longitude, latitude and altitude. If only 3 satellites can be received The signal, which can only compute 2-dimensional coordinates: precision and latitude, may also show altitude data, but this data is invalid. Most GPS can not only display coordinates in latitude/longitude, but also can use UTM (Universal Transverse Mercator) coordinate system to display coordinates but we still use LAT/LONG system, which is mainly by you. The coordinate system of the map used is determined. The precision of the coordinates is when Selective Availability is turned on. The horizontal accuracy of the GPS is between 100-50 meters, depending on the number and strength of received satellite signals. If you have arrived according to GPS instructions, then look around and you should find your target in an area about the size of a football field.
When SA closes, the accuracy can reach about 15 meters. The high degree of accuracy is worse due to the system structure. Latitude and longitude display methods can generally be selected according to their preferences, generally "hddd.ddddd", "hddd*mm.mmm" "," hddd*mm "ss.s" "" (where "*" represents "degree" â€, the same below) The length of the Earth’s meridian is 39940.67 km, and the latitude changes once and for all 110.94 km, one point 1.849 km, one second 30.8 m, the equator is 40075.36 km, the Beijing area is latitude 40 degrees north latitude, and the latitude circle length is 40075 * sin (90-40), the longitude of this place once combined 276 kilometers, a total of 1.42 kilometers a second 23.69 meters, you can select a display, and change the number of a number of meters corresponding to the ground to remember, This will create a rough correspondence between latitude and longitude and actual mileage. Most GPSs have the function of calculating the distance between two points and can give the exact distance between two coordinates. The height of the display will be imperial and metric two ways, into the GPS SETUP page, set to metric system, so that in other speed, distance and other displays will also become metric.
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