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Unformatted text preview: 1 GY 301: Geomorphology 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. Dougs 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 ht p:/ 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) 2 Todays Agenda 1. Finish introduction to topographic maps 2. Dougs 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...
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This note was uploaded on 02/05/2012 for the course GLY 301 taught by Professor Staff during the Fall '10 term at S. Alabama.
- Fall '10