Understanding the GPS


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GIS Specialist

The line of latitude is read as The line of longitude is read as 2. The image above shows the location of the Statue of Liberty on Google Maps. The coordinates given for its location are:. Just to recap, the Decimal Degree DD coordinates does not have the letters N or S to signify whether the latitude coordinate is above or below the Equator. Neither does it have the letters W nor E to signify whether the longitude coordinate is to the west or east of the Prime Meridian. This is done through the use of positive and negative numbers.

Error analysis for the Global Positioning System

Since the latitude coordinate is positive, the coordinate is above the Equator. Since the longitude coordinate is negative, the coordinate is west of the Prime Meridian. There will be a search bar at the top-left corner of the page. Enter the coordinates into the search bar then press the Enter key or the Search icon.

In this Section

The coordinates can be in any of the three formats. Please note that the coordinates must be entered correctly.


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For mathematicians willing to perform the raw calculations, you can learn how to convert from DMS to DD and vice versa. Although both methods are based on the same underlying principles, each accesses different data sources and achieves different levels of accuracy. Combining both methods provides flexibility during data collection and improves data integrity.

Understanding GPS

The space segment includes the 24 operational NAVSTAR satellites that orbit the earth every 12 hours at an altitude of approximately 20, kilometers. Each satellite contains several high-precision atomic clocks and constantly transmits radio signals using a unique identifying code. The Monitor Stations passively track each satellite continuously and provide this data to the Master Control Station. The Master Control Station calculates any changes in each satellite's position and timing.

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These changes are forwarded to the Ground Antennas and transmitted to each satellite daily. This ensures that each satellite is transmitting accurate information about its orbital path. The GPS receiver uses these signals to determine where the satellites are located. With this data and information stored internally, the receiver can calculate its own position on earth.

This positional information can be used in many applications such as mapping, surveying, navigation, and mobile GIS. It provides accurate positions for point, line, and polygon features. By verifying the location of previously recorded sites, GPS can be used for inspecting, maintaining, and updating GIS data. GPS provides an excellent tool for validating features, updating attributes, and collecting new features. Field inspectors, maintenance teams, utility crews, and emergency workers all require timely access to enterprise GIS data so they can make informed decisions.

Accuracy of GPS data - OpenStreetMap Wiki

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How GPS Works ? - Global Positioning System Explained In Hindi

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