NRC 140 3.2

What is the main element used to describe the north-south position on Earth?

• Longitude

• Prime Meridian

• Equator

• Parallel

Which circle of latitude is the northernmost where the sun can be directly overhead?

• Tropic of Capricorn

• Antarctic Circle

• Tropic of Cancer

• Arctic Circle

What is the angle that describes the east-west position on Earth?

• Meridian

• Longitude

• Parallel

• Latitude

Which projection technique is based on a cone touching the Earth on a circular line?

• Azimuthal Projection

• Mercator Projection

• Conical Projection

• Cylindrical Projection

What is the purpose of a Geocentric Datum?

• To calculate the weight of geographic features

• To determine the color of geographic features

• To measure the distance between two points on Earth

• To define the position of the spheroid relative to the center of the Earth

Which coordinate system uses a Cartesian system with the origin at the intersection of the equator and central meridian?

• PCS

• GCS

• PTM

• UTM

What is the main difference between UTM and PTM coordinate systems?

• UTM has one zone while PTM has five zones

• UTM uses latitude and longitude while PTM uses X and Y coordinates

• UTM is used for political boundaries while PTM is used for nautical purposes

• UTM is global while PTM is local

Which datum is suitable for use in the Philippines and is based on the Clarke 1866 reference ellipsoid?

• WGS 1984

• GRS 1980

• Luzon 1911

• PRS 1992

What is the scaling factor at the central meridian for the Philippine Transverse Mercator (PTM) coordinate system?

• 0.9999

• 1.0000

• 0.99995

• 0.9996