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geomatics
| Question | Answer |
|---|---|
| What is the Universal Transverse Mercator grid system | The Universal Transverse Mercator (UTM) geographic coordinate system uses a 2-dimensional Cartesian coordinate system to give locations on the surface of the Earth |
| what is Mercator projection | The Mercator projection is a cylindrical map projection presented by the Flemish geographer and cartographer Gerardus Mercator in 1569. |
| How many zones does the UTM system divide the earth into | 60 Zones |
| The earth is divided into zones between __ & ___ latitude | 80 deg. s and 84 deg. N latitude |
| How large are the zones of longtitude | 6 degs. of longitude in width |
| what is zone 1 | 180 to 174 degs. W |
| zone numbers increase ___ to Zone | eastward , 60 |
| what is the projection that is used with a utm system | A transverse Mercator projection |
| what is meant by easting and northing | Easting and Northing are Cartesian geographic coordinates for points on the earths surface |
| What does the easting refer to? | The easting refers to the Eastward measured distance, or the x coordinate |
| What does the Northing refer to? | The Northing refers to the northward measured distance of the Y coordinate. |
| How are eastings and northings measured | eastings and northings are measured in meters from a horizontal datum. |
| Why were projections invented | Man has invented numerous projections in an attempt to better represent the curved surface of the earth on the plane surface o |
| Who was the first to apply a projection from a curved surface to a flat map? | Gerhardus Mercator in 1569. |
| Meridians of longitude are displayed | parrallel to one another |
| Lines of Latitude are displayed | parallels of latitude are straight lines whose distance from one another increases with their distance from the equator |
| When was the transverse mercator projection invented | 1800's |
| What is the difference between transverse Mercator and | in a Mercator projection the cylinder is tangent to the equator,and in the transverse Mercator the cylinder is placed tangent to the central meridian of an area, along a line of longitude. |
| What was the issue with the transverse Mercator | True scale was only found along the central meridian |
| Why is the UTM better | scale distortion is introduced at the central meridian but true scale is preserved along the two arcs of intersection |
| What are some characteristics of the UTM system | The projection covers 6 zones |
| Name a characteristic of the utm system | there are 60 zones around the globe |
| Where does zone numbering start for the utm zones | The international date line |
| What does zone 1 span? | Zone 1 spans 180 w long to 174 long deg w. |
| What does zone 60 span? | Zone 60 spans 174 e long to 180 e long. |
| what is the northing value at the equator | 0.0 meters |
| what is the northing value in the southern hemisphere | 10,000,000 m. North |
| the easting value is assigned | 500,000 m east referenced to the central meridian of each zone |
| What is the value of northing at the equator if we measure south of the equator | The northing at the equator is 10,000,000 m north to avoid negative numbers |
| What is the scale factor at the central meridian | The scale factor at the central meridian is 0.9996 |
| Ontario has how many zone boundaries and how many zones | 3 zone boundaries and 4 zones. |
| what is topography | |
| what does an azimuth = in quadrant 1 | az = 180 - bearing |
| what does a bearing = in quadrant 1 | bearing = 180 - azimuth |
| what does an azimuth = in quadrant 2 | az = 360 - bearing |
| what does a bearing = in quadrant 2 | bearing = 360-az |
| what does an az = in quadrant 3 | an azimuth = 180 + bearing |
| what does a bearing = in quadrant 3 |
Created by:
bfennell