##### Chapter 11 - GIS Fundamentals Final

What are digital elevation models, and why are they used so often in spatial analyses?

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How are digital elevation data created?

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Write the definition of slope and aspect, and the mathematical formulas used to derive them from digital elevation data

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11.4 - 11.9 page 511

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Plot a graph of slope in degrees (on x axis) against slope in percent (y axis). Which is usually larger, slope as degrees, or slope expressed as percent?

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What is an elevation contour?

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11.2 - 11.13

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What is the formula to calculate a contour height from two measured elevation points?

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11.15 - 11.19

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What are plan curvature and profile curvature, and how do they differ?

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Define the following: solar zenith angle, solar azimuth angle, and solar incidence angle

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draw a diagram illustrating the solar incidence angle, and identify what site/terrain factors affect the solar incidence angle

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what are viewsheds, when are they used and how are they calculated?

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What is a shaded relief map, also known as a hillshade surface? How are the values for each cell of the hillshade surface calculated?

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