Download presentation
Presentation is loading. Please wait.
Published byKaren Malone Modified over 9 years ago
1
Topographic Maps
2
Contour lines A line which connects points of equal elevation. Index Contours: Thick contour lines which have the elevation written on them.
4
Contour line properties: Contour lines never cross. The closer the lines the steeper the hill. At valleys, contour lines form “V”s which always point up hill.
6
Contour Interval The vertical distance between adjacent contour lines. Ratio Scale Graphic Scale
7
Benchmarks – Spot Elevations A benchmark: a mark on a topographic map and the earth which shows elevation to the nearest foot. (BM 377) Spot Elevations: elevations measured at road crossings or tops of hills. (.1127 or X1127)
8
Latitude and Longitude Latitude and Longitude are measured in degrees. ° 1 degree = 60 minutes. 60’ 1 minute = 60 seconds. 60” Example 44° 30’ 15” N, 92° 15’ 54” W Found in the corners of topo. maps and along the edges.
9
Latitude Parallel lines which indicate angles North and South of the equator. Equator 0° Latitude North pole 90 ° N Latitude South pole 90 ° S Latitude
10
Longitude Meridians measuring angles East or West of the Prime meridian. Prime meridian 0 ° long. International Dateline 180 ° long.
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.