By W. G. Rees
Absolutely up-to-date and containing major new fabric on images, laser profiling and snapshot processing, the 3rd variation of this well known textbook covers a wide variety of distant sensing purposes and methods around the Earth, environmental and planetary sciences. It specializes in actual rules, giving scholars a deeper realizing of distant sensing structures and their percentages, whereas final obtainable to these with much less mathematical education by way of offering a step by step method of quantitative themes. Boxed examples, extra images and diverse color photos have interaction scholars and exhibit them how the speculation pertains to the various real-world purposes. bankruptcy summaries, assessment questions and extra difficulties permit scholars to examine their knowing of key options and training dealing with genuine facts for themselves. Supplementary on-line fabric comprises hyperlinks to freely to be had software program, animations, computing device courses, color pictures and different web-based assets of curiosity
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Additional info for Physical principles of remote sensing
46) valid? 7. 7 mm, K1 and K2 have values of 851 W mÀ2 srÀ1 mmÀ1 and 1347 K respectively. 7 mm. Comp. : 3 Title Name: Rees Date:24/7/12 Time:14:07:46 Page Number: 42 3 Interaction of electromagnetic radiation with matter The interaction of electromagnetic radiation with matter is evidently fundamental to remote sensing. The subject is a vast one, embracing many areas of physics, and a fully systematic treatment of it would require at least a book in itself. In this chapter, therefore, we attempt to provide an overview that will be sufficient to gain an understanding of the operation of remote sensing systems.
50 mm, so the approximation is valid for microwave and radio frequencies for objects at typical terrestrial temperatures. 35) is called Stefan’s law. It shows how much power is emitted by a black body at temperature T, integrated over all wavelengths. 31) directly, but it may be sufficient merely to know the wavelength lmax at which Ll reaches a maximum. 898 Â 10–3 K m. 37) is called Wien’s law, or Wien’s displacement law. 50 mm, in the middle of the visible spectrum where we expect it to be. 3 mm, in the thermal-infrared region of the electromagnetic spectrum.
This relationship can be expressed as dP ¼ L cosydAdO ð2:23Þ where dP is the contribution to the power incident on the area dA from solid angle dO in the direction (y, j), and L is the radiance of the incident radiation in that direction. From this definition, it follows that the SI unit of radiance is W mÀ2 srÀ1. Solid angle Solid angles can be defined analogously to planar angles. A planar angle can be defined by measuring the length s of the arc that it subtends on a circle of radius r: the angle y (in radians) is given by s/r.