Lect_5_Multispect

Lect_5_Multispect - Lecture 5 Multispectral Digital Systems...

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ERS-185 Lecture #5 1/26 – 28/09 1 Lecture 5 Multispectral Digital Systems Part One VOLUNTEERS NEEDED: Generate Study Questions for Midterm • Questions (with answers) for your most interesting, difficult, or confusing concepts. (No define terms or instrument specifications) • 1 or 2 questions from Lectures, Lab, and Readings (min. 3 and max 10 questions) • Submit with short paragraph answer. Due: FRIDAY--FEBRUARY 6 th NOT GRADED
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ERS-185 Lecture #5 1/26 – 28/09 2
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ERS-185 Lecture #5 1/26 – 28/09 3
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ERS-185 Lecture #5 1/26 – 28/09 4 Multispectral Image Analysis
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ERS-185 Lecture #5 1/26 – 28/09 5 Jensen, 2000 Chart design for comparing SOME of the available digital imagery Chart design for comparing SOME of the available digital imagery SEE TABLE 7-13 Overview Overview Jensen, 2000 Jensen, 2000
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ERS-185 Lecture #5 1/26 – 28/09 6 TERMS: Pixels • Mixed Pixel Reflectance Analog to Digital Conversion • Quantization • Bits and Bytes • Brightness value (BV) = Digital Number (DN) • Dynamic range Spectral Resolution • Full Width Half Maximum Canopy shadows and soil effects (Zarco-Tejada, et al. 2005b)
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ERS-185 Lecture #5 1/26 – 28/09 7 Variation in the reflectance mixture effects the combination of energy captured within sensor pixel Pixel with vegetation, soil & shadows (Zarco-Tejada, et al. 2005b) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 400 500 600 700 800 Wavelength (nm) Reflectance 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 400 500 600 700 800 Wavelength (nm) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 400 500 600 700 800 Wavelength (nm) Crown Shadow Soil Endmembers : 1) olive crown, 2) shadow 3) soil reflectance extracted from 1-m data (Zarco-Tejada, et al. 2005b)
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ERS-185 Lecture #5 1/26 – 28/09 8 TERMS: Pixels • Mixed Pixel Reflectance Analog to Digital Conversion • Quantization • Bits and Bytes • Brightness value (BV) = Digital Number (DN) • Dynamic range Spectral Resolution • Full Width Half Maximum Scanning Electron Microscope Image of the Microscope Image of the Front Surface of a Charge Charge -Coupled Device Coupled Device (CCD) Linear Array Like (CCD) Linear Array Like that Used in the SPOT that Used in the SPOT HRV Sensor Systems HRV Sensor Systems Jensen, 2000 100 μ m 10 μ m Courtesy of SPOT Image, Inc. SPOT Image, Inc.
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ERS-185 Lecture #5 1/26 – 28/09 9 Remote Sensing Raster (Matrix) Data Format Remote Sensing Raster (Matrix) Data Format 0 127 255 range (typically 8 bit) Associated gray-scale 10 15 17 20 15 16 18 21 17 18 20 22 18
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Lect_5_Multispect - Lecture 5 Multispectral Digital Systems...

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