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<br />:-... #>. - <br />~:': j 11 <br /> <br />GLOSSARY <br /> <br />color-composite image.--A color image produced by assigning primary colors to <br />three spectral bands. For Landsat images, blue ordinarily is assigned <br />to band 4 (0,5-0.6 micrometer), green to band 5 (0.6-0,7 micrometer), <br />and red to band 7 (0.8-1.1 micrometers), forming an image closely <br />approximating a color-infrared photograph. <br />ground information.--Term used for data and information obtained by ground- <br />based reconnaissance which can be used to check and confirm interpreta- <br />tions of 'remotely-sensed data. <br />multispectral scanner (MSS),--A remote-sensing device which senses data in <br />two or more discrete spectral bands. In Landsat, the sensor scans the <br />ground using an oscillating plane mirror in a path normal to the satel- <br />lite's path. <br />pixel,--An acronym for picture element <br />Landsat data, the term refers to the <br />56x79 meters) that is viewed by the <br />that the signal is sampled, <br />pixel value.--Digital value of reflected energy <br />sented by a given pixel. <br />remote sensing,--The measurement or acquisition of information pertaining to <br />some property of an object or phenomenon,by use of a sensing device that <br />is not in physical contact with the object or phenomenon under study. <br />spectral band,--An interval in the electromagnetic spectrum defined by wave- <br />lengths, frequencies, or wave numbers, <br />spectral signature,--Quantitative measurement of the electromagnetic proper- <br />ties of an object at one or several wavelength intervals. <br />sun synchronous.--An earth-satellite orbit in which the orbital plane is near <br />po 1 ar and the a 1 t i tude is such that the sate 11 i te passes over all places <br />on the earth having the same latitude twice daily at nearly the same <br />local sun time. <br /> <br />(resolution cell). In reference to <br />area on the ground (185x260 feet or <br />multispectral scanner at each point <br /> <br />from a surface area repre- <br /> <br />METRIC CONVERSION TABLE <br /> <br />The inch-pound units used in this report may be converted to metric <br />units by using the following conversion factors: <br /> <br />Multiply inch-pound unit By To obtain metric unit <br />inch (in, ) 25.4 mi 11 imeter (mm) <br /> 2.54x104 micrometer (um) <br />foot (ft) 0,3048 meter (m) <br />mi Ie (mil 1.609 ki lometer (km) <br />sq ua re mi 1 e (mi2) 2.590 square kilometer (km2) <br />acre 0.4047 hectare (ha) <br /> <br />V <br />