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301-pp2 - UNIVERSITY OF SOUTH ALABAMA Last Time 1 Course...

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1 GY 301: Geomorphology Lecture 2: Topographic maps part 2; Transit Surveys UNIVERSITY OF SOUTH ALABAMA Last Time 1. Course Info 2. Introduction to topographic maps 3. Doug’s inability to tell time Topographic Maps Know your enemy! Scale (Relational Fraction; Graphical) Elevation contours (Relative to M.S.L) Boundary (Latitude & Longitude) Color (Water bodies, Woodlands, etc.) Cultural Features (man-made features) Scale At the bottom of the map; two types 2) Relational Fraction (RF) 2) Relational Fraction (RF) 1) Graphical 1) Graphical Elevation Contours Contour lines ( Brown ) Based on aerial photographs analyzed stereographically Must agree with benchmarks and spot elevations Contour interval: elevation change between adjacent contours Hachured contours indicate closed depressions http://www.jesseshunting.com/images/topo-bench-saddle1.jpg Topographic Map Boundaries Always consist of lines of latitude and longitude Contain tick marks of UTM and SPCS on the border 32 7’ 30’’ 32 15’ 103 22’ 30’’ 103 30’ 32 7’ 30’’ 32 15’ 103 30’ 103 22’ 30’’ 7.5’ Topographic Quadrangle border (1:24,000)
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2 Today’s Agenda 1. Finish introduction to topographic maps 2. Doug’s inability to tell time Topographic Map Colors Brown : topographic contours Green : Forest and/or wetlands White White : cleared areas (i.e. pastures, etc.) Black: Cultural features (buildings, roads) • Red : Land office grid system (Township & Range system); Major road systems Magenta : Photo-revised areas Blue: water bodies Topographic Map Examples Map Coordinate Systems Land Office Grid system (Township & Range) Universal Transverse Mercator (UTM) State Plane Coordinate System (SPCS) Land Office Grid System T1N T2N T1S T2S R1E R2E R1W R2W State Capital 6 1 7 12
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