Lecture Notes 2-16-09

Lecture Notes 2-16-09 - signal being bounced back Ex...

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Example Questions What was the oldest known map? Definition of geodesy How is the shape of the earth best described? Characteristics of latitude and longitude Nucartor projection Which geometric surface is not used to make a map? Scale - Most detailed Topographic maps show? What does wavelength mean? Color not included in visible spectrum EMR – what happens when it hits the surface? Which platform has never been used for remote sensing? Remote Sensing: Overview and Systems Remote Sensing Devices Spectral o Broadband – receive energy from many wavelengths, changes into composite signal. o Narrow-band – showing one part of the spectrum. o Multispectral – more than one narrow-band signals being shown at once. Ex: Landsat Signal o Active – Sends out signals, when they hit an object it is reflected back to the system and converted into an image Radar – radio pulse Laser – laser pulse o Passive – Most common, does not generate a signal, it looks at other
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Unformatted text preview: signal being bounced back. Ex: Sunlight – reflected, absorbed, or transmitted. Remote Sensing form Airborne Platforms • Advantages: o An improved vantage point. o Stop action shots. o Permanent recording. o Broader spectral sensitivity than the human eye. o Better spatial resolution than many ground-based systems. • Aerial photographs are not maps, just images – show a high degree of radial distortion – lens have optical properties • Different from regular photos o Objects are portrayed from an overhead position. o Infrared wavelengths may be recorded. o The scale may be different from what we are used to seeing. • Planimetric shift - sub objects appear to be above or below the levels of the image. o Only image proportionally right is the image 90 degrees, straight down, from the camera – known as radar. o These photos can be used as a map because of planimetric shift...
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Lecture Notes 2-16-09 - signal being bounced back Ex...

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