Showing papers in "Remote Sensing of Environment in 1993"

TL;DR: The Center for the Study of Earth from Space (CSES) at the University of Colorado, Boulder, has developed a prototype interactive software system called the Spectral Image Processing System (SIPS) using IDL (the Interactive Data Language) on UNIX-based workstations to develop operational techniques for quantitative analysis of imaging spectrometer data.

TL;DR: The AVIRIS system as mentioned in this paper is a full-time system consisting of a flight system, a ground data system, and a calibration facility, which operates year round at NASA's Jet Propulsion Laboratory (JPL).

TL;DR: In this article, the problem of distinguishing between green vegetation, nonphotosynthetic vegetation (NPV), and soils in imaging-spectrometer data is addressed by analyzing an image taken by the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) over the Jasper Ridge Biological Preserve (California) on September 20, 1989, using spectral mixture analysis.

TL;DR: In this article, a method for retrieving "scaled surface reflectances" assuming horizontal surfaces having Lambertian reflectances from spectral data collected by Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) is presented.

TL;DR: In this article, the authors show that the scheme proposed in their previous work to retrieve both the spectral emissivities and land surface temperature from AVHRR data is feasible and test the applicability of the method when atmospheric radiosoundings are not available, and discuss the effects of the errors generated by an approximate knowledge of the atmosphere on the retrieval of both emissivity and surface temperature.

TL;DR: The use of satellite-derived vegetation indices for crop monitoring and yield estimate and forecast is of key importance for those organizations in charge to monitor the agrarian season as discussed by the authors, and the potential use of AVHRR / NDVI data for wheat monitoring in Italy is investigated.

TL;DR: In this paper, a forest ecosystem process model was used to examine the importance of leaf area index and species-dependent physiology when estimating photosynthesis in 21 boreal forests near Fairbanks, Alaska.

TL;DR: In this article, the potentials and limits of estimating canopy parameters using only a reflectance spectrum in the optical domain, and the PROSPECT + SAIL model are investigated using simulations performed on A VIRIS (Airborne Visible~Infrared Imaging Spectrometer) equivalent spectra, corrected for the atmospheric effects.

TL;DR: In this paper, a knowledge-based expert system was used to automatically produce image maps showing the principal surface mineralogy from Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data.

TL;DR: In this paper, the reflectance spectra of the aquatic vegetation of Searsville Lake in coastal central California using a high spectral resolution hand-held spectroradiometer were studied.

TL;DR: In this article, a method based on spectral mixture analysis was developed to estimate the concentration of suspended sediment in surface waters of the Amazon River wetlands from Landsat MSS and TM images.

TL;DR: In this article, ground data from the Central Plains Experimental Range in northeast Colorado and Landsat satellite images of that area acquired in August 1989, June 1990, and September 1990 were used to evaluate the level of association that can be expected from a univariate model relating spectrally derived vegetation indices (difference, ratio and normalized difference vegetation indices) and dried green vegetation biomass.

TL;DR: In this article, the authors investigated newer vegetation indices that have been developed to minimize soil background effects and developed a reflectance-based crop coefficient for corn that applies over a wide range of agricultural soil reflectance.

TL;DR: In this article, a semi-empirical water-cloud model was used to simulate the backscattering coefficients obtained over the growing season, as a function of LAI and surface soil moisture.

TL;DR: In this paper, the authors proposed a vegetation cover index in the Band 4-Band 5 data space, known as PD54, which is calculated by identifying a soil line or, more correctly, an upper soil band limit, and then determining the perpendicular distance of each pixel from that line.

TL;DR: In this article, a modified stepwise principal component analysis (MSPCA) approach was used to select 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 30, 40, and 80 nm spectral resolution.

TL;DR: Rates of leaf photosynthesis were reduced significantly compared to healthy leaves even at low levels of infection, and chlorophyll b content increased significantly as the proportion of leaf surface infected increased, but no statistically significant change was observed in chlorophyll a content.

TL;DR: A real-time processing scheme has been designed at the Centre de Meteorologie Spatiale (CMS) in Lannion to extract cloud cover and surface parameters from NOAA-11 AVHRR imagery received at CMS.

TL;DR: In this paper, the mid-infrared reflectance spectra of a number of mineral mixtures (including quartz-microcline, quartz-hornblende, microcline-albite and albite-augite) were measured using an interferometer spectrometer with a 4/cm resolution.

TL;DR: In this paper, an inversion technique and data collected by the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) was used to estimate the grain size for the near-surface snow layer.

TL;DR: In this paper, a technique was developed to map forest fire boundaries by subtracting a late-summer AVHRR NDVI image from an early summer scene, and the locations and boundaries of wildfires within the interior region of Alaska were obtained from the Alaska Fire Service.

TL;DR: A review of recent progress in the field of imaging spectrometry is presented based on the 14 articles comprising the special issue of this journal as discussed by the authors, which is achieved through research done with data from the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS), the first image spectrometer to cover the full solar reflected portion of the spectrum.

TL;DR: It is not appropriate to use the method to estimate signal to noise ratios from images having nonnegligible interband radiometric calibration errors at spatial scales less than or equal to the size of the small imaging blocks used in the noise estimation.

TL;DR: In this paper, the authors examined the potential for the satellite-based TM sensor to serve as a regular monitoring tool and concluded that Landsat TM has the resolution and accuracy to be a potentially very useful monitoring tool.

TL;DR: In this paper, the relationship between vegetation indices (VIs) and the midday soil heat flux/net radiation ratio (G/Rn) and two commonly used vegetation indices were used to analytically derive formulas describing the relationship.

TL;DR: In this article, the effects of structural variation on the remotely sensed response of a coniferous forest plantation in the United Kingdom were found to be strongly and negatively correlated with a range of structural properties and with the age of the stands.

TL;DR: In this paper, two simple techniques (Continuum Interpolated Band Ratio, CIBR, and Narrow/Wide ratio, N/W) to retrieve path precipitable water from AVIRIS high spectral resolution radiance data using the 940 nm water absorption band are compared.

TL;DR: In this paper, the authors presented new thermal infrared spectra of oil slicks made from five different crude oil samples with a wide range of API gravities and compositions after a brief outgassing phase, all oil slick spectra are quite similar and little affected by thickness, extended exposure to air or sunlight, and even by emulsion with seawater.

TL;DR: The feasibility of using imaging spectrometry in studies of playa evaporites is demonstrated by mapping efflorescent salt crusts in Death Valley (California), using Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data and a recently developed least-squares spectral band-fitting algorithm as mentioned in this paper.

TL;DR: In this article, the variability of the relationship between the normalized difference vegetation index (NDVI) and the daily interception efficiency ( ϵ i ) of a discontinuous canopy is investigated using a simple radiative transfer model developed for regular-clumped crops.