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Showing papers in "Remote Sensing of Environment in 1991"


Journal ArticleDOI
TL;DR: This paper reviews the necessary considerations and available techniques for assessing the accuracy of remotely sensed data including the classification system, the sampling scheme, the sample size, spatial autocorrelation, and the assessment techniques.

6,747 citations


Journal ArticleDOI
TL;DR: In this article, the potentials and limits of different vegetation indices are discussed using the normalized difference (NDVI), perpendicular vegetation index (PVI), soil adjusted vegetation index, and transformed SAVI.

1,824 citations


Journal ArticleDOI
TL;DR: In this article, the authors evaluated published data to determine the functional dependence of a vegetation parameter on vegetation characteristics, and they proposed a model that attempted to meet these requirements by estimating the vegetation parameter b that characterizes the canopy.

902 citations


Journal ArticleDOI
TL;DR: In this article, a method is developed for relating scene digital counts among several images of the same scene by identifying radiometric control sets with mean reflectances that are basically constant, which can be used to compute linear transforms that relate digital count values between images.

663 citations


Journal ArticleDOI
TL;DR: In this paper, a global measure of vegetation green foliage dynamics with a measurement precision of ± 10% and a monthly time resolution may not yet meet the exacting needs of some biospheric modelers, but it is remarkable, considering that this possibility was not even conceived when the AVHRR was designed.

569 citations


Journal ArticleDOI
TL;DR: In this article, the authors examined the adequacy of traditional approaches to the derivation of global information on land cover, and the contribution of coarse resolution satellite data from the NOAA series of satellites is discussed.

451 citations


Journal ArticleDOI
TL;DR: In this article, spectral components analysis (SCA) was used to analyze data from two studies conducted in 1989, where boll counts and percent plant cover measurements in a salt-affected cotton field on 60 m grid intervals and calculated GVI, PVI, TSAVI, and NDVI at the grid intersections for SPOT HRV and videography scenes.

400 citations


Journal ArticleDOI
TL;DR: In this paper, Cloud-screened daily data over Kansas prairie during 1 month were used to develop a viewing angle correction for the observed range of sun angles and for that particular surface type.

289 citations


Journal ArticleDOI
TL;DR: In this paper, a split-window equation is derived by linearization of Planck's function and atmospheric trasmittance, which depends on atmospheric water vapor, viewing angle, and channel surface emissivities.

282 citations


Journal ArticleDOI
TL;DR: In this article, the authors analyzed the relationship between the AVHRR data and ecological variables and evaluated the possibility of estimating actual evapotranspiration using the available data, and found that individual vegetation/soil combinations exhibited different NDVI trajectories.

254 citations


Journal ArticleDOI
TL;DR: The aim of this research was to determine the effect of a second leaf pigment, red amaranthin, on the relationship between red edge and chlorophyll concentration.

Journal ArticleDOI
TL;DR: There has been significant progress in the application of microwave remote sensing for measuring soil moisture as discussed by the authors, and there have been a number of studies using aircraft and spaceborne data that have demonstrated its usefulness for agricultural and hydrologic applications, but there are still several unresolved questions regarding the optimal instrument configuration and other target characteristics such as roughness and vegetation.

Journal ArticleDOI
TL;DR: In this article, the spatial variability of organic carbon, soil phosphorus, and wheat yields measured on several 655 m long transects in complex eroded hills of the Palouse region of eastern Washington was studied using classical statistics and geostatistics.

Journal ArticleDOI
TL;DR: In this article, radiative transfer data were collected for three conifer species and a northern hardwood species and showed that conifer forests are more absorptive than broadleaved, deciduous hardwood forests.

Journal ArticleDOI
TL;DR: The radiosity method is a valuable tool to model the transport of light in vegetative canopies as well as a tool to evaluate bidirectional reflectance characteristics of discrete leaf canopy structures, such as angular reflectance signatures.

Journal ArticleDOI
TL;DR: A general computer graphics based model, named DIANA, is presented for computer generation of objects of arbitrary shape and for calculating bidirectional reflectances and scattering from them, in the visible and near infrared regions.

Journal ArticleDOI
TL;DR: In this paper, the hotspot effect is modeled using general principles of environmental physics as driven by parameters of interest in remote sensing, such as leaf size, leaf shape, leaf area index, and leaf angle distribution.

Journal ArticleDOI
TL;DR: In this paper, a simple model based upon the hypothesis that leaves specularly reflect light according to the Fresnel equations relates the observed bidirectional effects to the architectural and phenological conditions of the canopy.

Journal ArticleDOI
TL;DR: In this article, the laser induced fluorescence (LIF) spectra of pure plant pigments were determined for vitamin K 1, reduced nicotinamide adenine dinucleotide (NADPH), beta-carotene, and riboflavin, respectively.

Journal ArticleDOI
TL;DR: In this paper, a mixture model was used to extract soil biophysical properties from fine resolution soil spectra (400-900 nm) measured outdoors with a portable spectroradiometer.

Journal ArticleDOI
TL;DR: In this paper, the authors show that the long wavelength edge (the red edge) of the chlorophyll absorption band centered near 0.68 μm in the green and yellow portions of the electromagnetic spectrum in phosphorus-deficient plants shows a shift from the red edge to longer wavelength.

Journal ArticleDOI
TL;DR: In this article, the possibilities of crop parameter estimation from X-band radar backscattering measurements were investigated using empirical and simple physical relationships using ground-based, multitemporal, multiangle, and copolarized radar data.

Journal ArticleDOI
TL;DR: In this paper, a new forest reflectance model was proposed to predict the relations of forest reflectances with most important structural and optical model input parameters, and the model was tested on 12 Scots pine-dominated boreal forests in Estonia.

Journal ArticleDOI
TL;DR: In this article, an experimental access to effective surface parameters, surface temperature, and emissivity, relevant to satellite investigations in the thermal infrared band (TIR), is addressed and discussed.

Journal ArticleDOI
TL;DR: In this article, a satellite remote sensing method for estimating the amount of photosynthetically active radiation (PAR, 400-700 nm) incident at the earth's surface is described and tested.

Journal ArticleDOI
TL;DR: In this article, the grain yield of paddy rice was estimated from high spectral resolution reflectance (R) data (400-1900 nm interval) taken approximately 1.5 months after heading (approximately physiological maturity of the grain) during three crop seasons (1985, 1986, and 1987).

Journal ArticleDOI
TL;DR: In this article, the spectral vegetation indices (VIs) computed from spectral reflectance factors were examined in terms of biomass and LAI, and low-density canopies showed no change in the low VI values during the day.

Journal ArticleDOI
TL;DR: In this article, a simple inversion procedure was used to determine the canopy optical and structural parameters from optical reflectance measurements in one or two spectral regions, and the results of inversion agree reasonably well with those of phytometric measurements.

Journal ArticleDOI
TL;DR: A good correspondence in brightness temperature (TB) trends between the aircraft and satellite data was found as mentioned in this paper, and an expected inverse correlation between depth hoar thickness and TB was not found to be strong.

Journal ArticleDOI
TL;DR: In this article, a real-time data source for sound speed in the upper 100 m has been proposed for exploratory development at the Naval Oceanographic and Atmospheric Research Laboratory (NOARL).