The Effects of Weathering and Other Varnish-like Coatings on High Spectral Resolution Airborne Imagery (Part one)
风化及其它类荒漠漆表面层对高光谱分辨率遥感的影响（一）

Surface weathering produces coatings of mineral materials which may be similar to,or quite different from, the minerals of the underlying parent rock.There coating are usuallyonly microns to millimeters in thickness, but they completely control the reflectance spectra control the terrain. In a similar way coatings formed from adherence of wind-borne dusts, cemented or not, will also dominate the reflectance spectra as seen in remotely sensed ima gery. cemented coatings are often dark-colored (even black) and are usually termed "desert varnish" from their common occurrence in arid regions. Despite their featureless,dark colorto our eyes, there coatings (often days),show characteristic reflectance minima in the shortwave infrared (SWIR) regions, by which their mineralogical composition can be deduced.Thus to relate remotely sensed imagery to actual ground "geology"requires a good knowledge of the surficial character of the exposed rock outcrops.It is not always possible to find"fresh" surfaces in the field,and one must always differentiate"upper-surface"spectra(andalso "lower-surface" spectra)from the spectra of the "inner rock"materials.This paper describes one of the major surface coatings which is on the weathered dolomite carbonate from the early Poleozoic sequences of easternmost California USA.