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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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