GPS coordinates are most commonly expressed as latitude and longitude. … With the first number indicating latitude, and the second number representing longitude (the minus sign indicates “west”). Being numeric-only, the second means of notation is the most commonly used for inputting positions into GPS devices.Feb 14, 2020
Coordinates, in this context, are points of intersection in a grid system. GPS (global positioning system) coordinates are usually expressed as the combination of latitude and longitude. Latitude is a measure of degrees of distance from the equator, which is 0 degrees.
Handy tip: when giving a co-ordinate, latitude (north or south) always precedes longitude (east or west). Latitude and longitude are divided in degrees (°), minutes (‘) and seconds (“). There are 60 minutes in a degree and 60 seconds in a minute (similar to measuring time).
This value is the scientifically derived value for radius of the earth. Calculate latitude and longitude using the formula: latitude = asin (z/R) and longitude = atan2 (y,x).
When writing latitude and longitude, write latitude first, followed by a comma, and then longitude. For example, the above lines of latitude and longitude would be written as “15°N, 30°E.”
Lines of latitude run horizontally around the Earth and tell you how far north or south you are from the Equator. … A latitude reading will tell you how far north or south a location is. The North Pole is at 90 degrees latitude (or 90.0° N) and the south poles is at -90 degrees latitude (or 90.0° S).
Map reading (also sometimes written as map-reading) is the act of interpreting or understanding the geographic information portrayed on a map. Through map reading, the reader should be able to develop a mental map of the real-world information by processing the symbolized information shown on the map.
To convert from survey bearings to GPS coordinates, you can either use Google Maps to look up the coordinates of the bearings or use a physical map. With a physical map, first determine the landmark of origin, and then plot the bearings on a physical map to find the specific location.
And for USA to be +1 Y and -1 X. Latitude is the Y axis, longitude is the X axis. Since latitude can be positive and negative (north and south of the Equator), and longitude can be as well (negative west of Greenwich and positive eastward) when the -180 to +180 longitude system is use.
Universal transverse Mercator (UTM) is a geographic coordinate system and the most prevalent plane grid system used. UTM divides the earth into 84˚ north latitude to 80˚ south and is numbered into 60 vertical zones (each 6˚ latitude wide).
Because lines of latitude are numbered consecutively from the equator both to the north and to the south, each line (except for the equator) is identified by a number from 1 to 90, and the letter Nor S (North or South). Thus, the line that is 20 degrees north of the equator is referred to as Latitude 20° N.
Coordinates are often expressed as two sets of numbers. The first number is always the latitude and the second is the longitude. It easy to remember which is which if you think of the two coordinates in alphabetical terms: latitude comes before longitude in the dictionary.
Decimal degrees (DD) express latitude and longitude geographic coordinates as decimal fractions of a degree. … Decimal degrees are an alternative to using sexagesimal degrees (degrees, minutes, and seconds – DMS). As with latitude and longitude, the values are bounded by ±90° and ±180° respectively.
Accuracy. A value in decimal degrees to an accuracy of 4 decimal places is accurate to 11.1 meters (+/- 5.55 m) at the equator. … Because the earth is a spheroid and not flat, the accuracy of the longitude part of the coordinates increases the further from the equator you get.
When taking a grid reference, always read left to right along the bottom or top of the map first and then bottom to top along the side of the map. … If you want to precise in your grid reference, in your mind, roughly divide each side of the grid reference box into 10.
What does the six-figure grid reference 198823 tell you? It gives you an exact point in grid square 1988 that is 2/10s up and 3/10s along. It gives you an exact point in grid square 1988 that is 2/10s across and 3/10s up.
The second thing you need to do to read a map is determine its orientation.
Place the compass flat on your palm, with the direction of travel arrow pointing towards where you want to go. Twist your compass dial so that the orienting arrow lines up with the red end of the magnetic needle.
Read on as we take a look at some of the different map types and their uses. According to the ICSM (Intergovernmental Committee on Surveying and Mapping), there are five different types of maps: General Reference, Topographical, Thematic, Navigation Charts and Cadastral Maps and Plans.