Study Questions - GIS Datums, Projections, and Coordinate Systems 1. Briefly define: Datum: this represents the shape of the earth. Projection: converts the curved shaped of the Earth’s surface into a flat map Coordinate System: this identifies points on the Earth’s surface (and map) using (typically) two numbers 2. State the consequence of incompatible georeferencing in GIS maps. -*Referencing geodetic coordinates to the wrong datum can result in position errors of hundreds of meters. 3.List the two latest world datums often used in aviation analysis? 4.List two common map projections for aviation use. 5. Match the coordinate system with its correct units. __ B ___ Geographic a. northings and eastings in meters __ A __ UTM b. latitude and longitude in degrees, minutes, and seconds __ C ___ SPCS c. northings and eastings in meters or feet 6. A UTM zone extends + ____ 3 ______ degrees either side of the central meridian. 7. A SPCS zone extends + ____ 3 ______ degrees either side of the central meridian. 8. State the common name of the UTM system 0 northing line. 9. State the common name of the SPCS system 0 northing line. 10. The State Plane Coordinate System (SPCS) is the most widely used coordinate system in local and regional surveying and mapping applications in the United States and its territories.
11. The Florida East 0901 SPCS central meridian is 81 W . The false easting is 200,000 meters west (east or west) of the central meridian. This false easting value makes all easting values positive (positive or negative) and easting values greater than 200,000 meters are east of the central meridian and easting values less than 200,000 meters are west of the central meridian.
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- Fall '12
- Cartography, Map projection, Geographic coordinate system, Universal Transverse Mercator coordinate system, Polar coordinate system