Lecture09

Lecture09 - Measure a base line using a superior method...

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1 Geography 12: Maps and Spatial Reasoning Lecture 9: Cartometry: Lines and Areas Professor Keith Clarke A generic line (X 1 , Y 1 ) …. . (X n , Y n ) Line and Area features on topo maps Roads as lines
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2 Land surveys and roads A “length” datum Railroads Railroads
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3 Power lines Lines and areas Water bodies Watery symbols
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4 Water features Aquaduct/Canal/Flume/Spring More water Ice and snow
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5 Surface features: Strip mine Swamps Surface features Topography
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6 Contours: Whole separate lecture Distance measurement: from the ground •P a c i n g •S u r v e y – Chain/Pole – Wheel –S tad ia –EDM –GPS
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7 Pacing
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Unformatted text preview: Measure a base line using a superior method Devise method for pace counting Repeat measurement several times Average result and divide for length of pace Note how pace varies with terrain Measuring on the map Length from coordinates (x 1 , y 1 ) (x npts , y npts ) Area measurement: From the map Polar planimeter 8 James Clerk Maxwell (1855) Steinhaus Longimeter Four methods for area For example, Lake Los Carneros 9 Area from coordinates Equivalence Summary Topo maps and others show line and area features Features have different symbols and colors We can measure length and bearing of lines We can measure area of areas We can do this from the map or the coordinates...
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Lecture09 - Measure a base line using a superior method...

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