Airborne spectral measurements of surface reflectivity at ultraviolet and visible wavelengths
نویسندگان
چکیده
منابع مشابه
Precise Measurement of Lunar Spectral Irradiance at Visible Wavelengths
We report a measurement of lunar spectral irradiance with an uncertainty below 1 % from 420 nm to 1000 nm. This measurement uncertainty meets the stability requirement for many climate data records derived from satellite images, including those for vegetation, aerosols, and snow and ice albedo. It therefore opens the possibility of using the Moon as a calibration standard to bridge gaps in sate...
متن کاملAirborne measurements of forest and agricultural land surface emissivity at millimeter wavelengths
Passive microwave radiometers have been operated on an aircraft over the same (N OPEX) area of Sweden, near Uppsala in September 1995 and March 1907. Their measurements have allowed the calculation of the emissivity of boreal forest and agricultural land surfaces at 24, 50, 89 and 157 GHz over a range of incidence angles and polarisations. These results show consistent differences between dense...
متن کاملDual Sensitivities of Cells in Wolf Spider Eyes at Ultraviolet and Visible Wavelengths of Light
Intracellular recordings have been made from visual cells in principal and secondary eyes of in vitro wolf spider preparations. The responses of all cells to all wavelengths of light were graded depolarizations; no hyperpolarizations or nerve discharges were seen. Cells in a secondary eye, the anterior lateral eye, had a maximum sensitivity in the visible at 510 nm and a secondary maximum, or s...
متن کاملDirect index of refraction measurements at extreme-ultraviolet and soft-x-ray wavelengths.
Coherent radiation from undulator beamlines has been used to directly measure the real and imaginary parts of the index of refraction of several materials at both extreme-ultraviolet and soft-x-ray wavelengths. Using the XOR interferometer, we measure the refractive indices of silicon and ruthenium, essential materials for extreme-ultraviolet lithography. Both materials are tested at wavelength...
متن کاملAirborne Measurements of Surface Anisotropy
Surface spectral bidirectional reflectance is a major parameter of interest to the biospheric sciences, remote sensing, and global change communities. For example, the pronounced reflectance peak at the back scattering range of vegetated surfaces, known as the “hot spot” or “opposition surge” (cf. Hapke 1993), is found to be closely related to the state of several biophysical and physical param...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Geophysical Research: Atmospheres
سال: 2000
ISSN: 0148-0227
DOI: 10.1029/1999jd900813