301-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time Finish...

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1 GY 301: Geomorphology Lecture 3: Constructing Contours UNIVERSITY OF SOUTH ALABAMA Last Time Finish introduction to topographic maps How to do transit (compass) surveys 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 61 71 2 13 18 19 24 25 30 31 36 square miles 36 6 miles NW NE SE Target location Legal description of location: NE ¼ , SW ¼, section 22, T2S, R2E 2 3 4 5 The Pocket Transit (Brunton) • Used to measure compass directions • Allows for magnetic declination correction • Can measure vertical angles with clinometer. http://wb8.itrademarket.com/ Distributing Closed Traverse Error • Error is distributed cumulatively through closed traverse 1 2 3 4 5 6 7 8 9 original Total error vector
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2 Distributing Closed Traverse Error • Error is distributed cumulatively through closed traverse 1 2 3 4 5 6 7 8 9 original corrected Total error vector 5/9 error vector 2/9 error vector 1/9 error vector Today’s Agenda A Simple day; 1. How to draw contour lines 2. Computer contouring methods Contouring •163 •162 •150 •138 •143 •158 •146 •133 •140 •127 •125 •117 •120 •103 •135 •102 •174 •155 •170 •163 Before starting….
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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.

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301-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time Finish...

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