Topographic Maps/Field Maps
About this set
Created by:
jhaasbroda on February 24, 2010
Subjects:
Classes:
Janet's Earth Science Class(Birchwood)
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27 terms
Terms | Definitions |
|---|---|
 relief | difference in elevation between highest and lowest points |
| elevation | height above mean sea level |
| contour lines | lines that connect point of equal elevation |
| index contour | every fifth contour is darker and labeled by elevation |
| legend | key to map symbols |
| magnetic north | direction of magnetic north pole (what the compass points to) |
| true north | direction of geographic north pole |
| magnetic declination | difference between true north and magnetic north |
| contours that cross a stream | form a "v" shape and flows towards the open part of the "v" |
| concentric circles | shows a hill |
| Representative Scale (R.F. or scale) | how many times the map has been reduced,ie 1:1,000,000 |
| isotherm | lines that connect points of equal temperature |
| isobar | lines that connect points of equal pressure |
| polyconic projection | map projection use to draw topographic maps |
| latitude | distance in degrees north and south of the Equator |
| longitude | distance in degrees east and west of the Prime Merdian |
| depression contour | use to show craters and hollows on a map |
| bench mark | places where exact elevations are shown on permentant plates |
| USGS | United States Geological Survey. Responsible for making topographic maps and other maps |
| 7.5 minute quadrangle | USGS map series |
| gradient | slope or how steep the land is |
| level land | shown by contour lines far apart |
| steep land | shown by contour lines close together |
| profile | shows elevation changes across a map section |
| remote sensing | methods include Landsat and imaging radar |
| field map | map where a physical feature is measured |
| contour interval | difference in elevation between one contour line and the next contour line (vertical distance) |
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