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Topographic Maps. Day 2. Topographic Maps. Objective – “I will be able to compare and contrast latitude with longitude.” Essential Question – “Besides the directions of the lines, what is the one big difference between latitude and longitude?” Standard – SC 8-3.9.

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## Topographic Maps

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**Topographic Maps**Day 2**Topographic Maps**Objective – “I will be able to compare and contrast latitude with longitude.” Essential Question – “Besides the directions of the lines, what is the one big difference between latitude and longitude?” Standard – SC 8-3.9**Topographic Maps**• Models the change in elevation of the Earth’s surface • Shows details of hills, depressions, river valleys, canyons, and volcanoes**(Pre-assessment**question 4)**Contour Lines connect points of equal elevation**Contour interval = 50 feet The contour interval is the set difference in elevation between adjacent contour lines (Pre-assessment questions 7 & 8)**Index Contours Thicker contour lines marked with the**elevation Index Contour Lines Elevation marked on index contour line What is the contour interval of this map? Use the index contour lines to get your answer.**Flow direction**Flow direction Where contour lines cross a river or stream, they form a “V” that opens downstream**Lines far apart = gradual slope**Close together = steep slope**Rules for contour lines**• Contour Lines close around hills and basins. Basins = holes (look for hachures – lines on the contour lines) • Contour Lines Never Cross. How could one spot have 2 elevations? • When contour lines cross streams, they form a “V” that opens in downstream direction.**‘Elevation’ Terms**• Topography - the configuration of the surface of the land. • Elevation - vertical distance between a given point and the datum plane. • Datum plane - zero elevation, usually sea level • Bench mark (BM) - a point of known elevation, usually marked by an ‘X’ on the map. • Relief - difference in elevation between points of higher and lower elevation. • Gradient - change in elevation over distance.**‘Elevation’ Terms (continued…)**• Contour line - lines connecting points of equal elevation • Contour interval – set difference in elevation between adjacent contour lines • Index contours - Thicker lines with elevations printed • Hachure marks - used to identify depressions (such as a volcano crater)**MAP TERMS**• Map Scale – relationship between the map and actual distances on the ground • Shown as ratios 1:80,000 1 unit on the map = 80,000 units on land. • Map Legend – explains map colors, symbols • Topographic Symbols on p. 600 • Map Series – covers the same dimensions of latitude and longitude (Pre-assessment questions 5 & 6)**Fractional – 1/24000**Verbal – “One unit on the map is equal to 24000 units on the ground.” (The ‘unit’ stays the same.) Map Scales Ratio – 1:24000 Graphic (Bar)

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