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GEOG 160 November 10, 2014 Mapping Our Changing World Joshua Stevens [email protected] Office: 210 Walker Hours: Tues 11-12 Fri 10-11

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This Week • Update: Quiz 6 (Ch 6 & 7) will open today! • You will have until Sunday @ 11:59pm to complete it. • Begin Chapter 7: Remote Sensing

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….not to be confused with “remote viewing”

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Landsat 8 data acquired October 24, 2014

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© McMath-Pierce Solar Observatory Frequency of Colors Emitted by the Sun

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© Immunolight The Electromagnetic (EM) Spectrum

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© NASA

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© NASA

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© NASA

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© NASA

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© NASA

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© NASA

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© NASA

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True Color © NASA

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False Color - SWIR w/ stretch © NASA

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False Color - Thermal w/ stretch © NASA

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Two General Types of Remote Sensing • Space Borne: Satellites acquire the images; often under continuous use • Aerial imaging systems: Uses aircraft to collect images; usually flown on-demand

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Electromagnetic (EM) Spectrum

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Electromagnetic (EM) Spectrum Our eyes can only see a small portion of this energy Visible wavelengths: around 390 nm - 700 nm 700 nm 390 nm

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Electromagnetic Energy Emission

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Electromagnetic Energy Emission

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Just as the sun emits energy unevenly across the spectrum, our eyes are not equally sensitive to every color. We are much more sensitive to greens and reds. Side note:

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Interpreting Remote Sensing Imagery Requires Skill • Elements of Image Interpretation • Size • Shape • Tone/Color • Pattern • Shadow • Texture • Association • Site

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Element of Interpretation: Size

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Element of Interpretation: Shape

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Element of Interpretation: Tone

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Element of Interpretation: Pattern

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Element of Interpretation: Pattern

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Element of Interpretation: Shadow

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Element of Interpretation: Texture

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Element of Interpretation: Association

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Element of Interpretation: Association

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Element of Interpretation: Site

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Next Class • We’ll talk about different types of satellites and their missions • Image correction and classification • Computed derivatives of sat. data • Why ‘Doomsday Preppers’ wouldn’t exist if they knew about remote sensing