Showing papers in "Remote Sensing of Environment in 1992"

TL;DR: In this article, the authors presented a new "physiological reflectance index" (PRI) isolated from narrow waveband spectral measurements of sunflower canopies, which correlates with the epoxidation state of the xanthophyll cycle pigments.

TL;DR: In this article, a more sophisticated and realistic treatment of leaf physiological processes within a new canopy integration scheme was proposed, and the results indicated that area-averaged spectral vegetation indices, as obtained from coarse-resolution satellite sensors, may give good estimates of the area-integrals of photosynthesis and conductance even for spatially heterogeneous (though physiologically uniform) vegetation covers.

TL;DR: In this article, the directional hemispherical spectral reflectance of a wide range of natural earth surface materials has been measured and is summarized and used to predict directional spectral emissivity from these data.

TL;DR: In this article, an algorithm utilizing reflectance spectra bands in the photosynthetically active radiation (PAR) region of the solar spectrum was developed for the remote estimation of the concentrations of chlorophyll a, chlorophyck b, and carotenoids in soybeans.

TL;DR: In this article, a high-resolution map of the velocity field of the central portion of Ice Stream E in West Antarctica, generated by the displacement-measuring technique, is presented, and a cross-correlation software is found to be a significant improvement over previous manually based photogrammetric methods for velocity measurement, and is far more cost-effective than in situ methods in remote polar areas.

TL;DR: In this paper, the relationship between the normalized difference vegetation index (NDVI) and absorbed photosynthetically active radiation (APAR) in a vegetation canopy was studied and the results indicated that instantaneous observations can be used to characterize the diurnally integrated APAR in vegetation canopies.

TL;DR: In this paper, the authors evaluated several procedures, including radiative transfer codes (RTCs) with simulated atmospheres, image-based procedures and dark-object subtraction (DOS), by comparing surface reflectance factors derived from Landsat Thematic Mapper (TM) digital data with low-altitude, aircraft-based measurements for seven dates over a 1-year period.

TL;DR: In this article, the authors evaluate relationships between spectral and texture variables derived from SPOT HRV 10 m panchromatic and LANDSAT TM 30 m multispectral data and 16 forest stand structural attributes.

TL;DR: Compared spatial feature extraction methods in the land-use classification of the SPOT HRV multispectral data at the rural-urban fringe of Metropolitan Toronto indicated that some spatial features derived using the GLCM and the SST methods can largely improve the classification accuracies obtained by the use of the spectral images only.

TL;DR: In this paper, the spectral and bidirectional reflectance of 26 soils was measured in the laboratory both with a field spectroradiometer (1000 narrow wavebands from 450 nm to 2450 nm) and a radiometer simulating TM channels (the five TM2, TM3, TM4, TM5, and TM7 broad bands).

TL;DR: In this paper, the results of an experiment to relate the concentrations of chlorophyll, protein, starch, sugar, amaranthin, and water in fresh whole leaves to their reflectance at wavelengths throughout the visible and near infrared were reported.

TL;DR: In this paper, a linear relation between cumulative APAR and cumulative aboveground phytomass production was found for both corn and soybeans, and the rate of accumulation per unit APAR was more than twice as great for corn as for soybean.

TL;DR: In this paper, a differential absorption method, similar to the split window technique used over sea surfaces, can be adapted and used locally over land surfaces, which allows to derive land surface temperature with an accuracy better than 1.5 K.

TL;DR: In this paper, a 3D radiative transfer model was used to investigate the relationship between spectral indices and fraction of absorbed photosynthetically active radiation (PAR) in horizontally heterogeneous vegetation canopies.

TL;DR: In this paper, the authors evaluated three techniques to extract emissivity information from multispectral thermal infrared data acquired over Cuprite, Nevada in September 1990 and concluded that the two new techniques (thermal log residuals and alpha residuals) provide two distinct advantages over the assumed Channel 6 emittance model.

TL;DR: In this article, the spectral shifts characterized by the wavelength λi of the inflexion point in the red-edge region (670-780 nm) were analyzed using model simulations.

TL;DR: In this paper, reflectance factors and biophysical plant measurements for wheat (Triticum aestivum L.) experiments conducted at Lubbock, Texas, Manhattan, Kansas, Phoenix, Arizona, Sidney, Montana, and Weslaco, Texas were fit by various equation forms for six currently used vegetation indices (VI): n -space greenness (GVI), perpendicular (PVI), NIR/RED ratio (RVI), SAV12), normalized difference (NDVI), and transformed soil adjusted (TSAVI).

TL;DR: In this paper, the authors compared field measurements of LAI to normalized difference vegetation index (NDVI) values derived using Lnandsat Thematic Mapper (TM) data, for 16 fertilized and control slash pine plots on three dates.

TL;DR: Spectral mixture analysis has been used primarily for visible and near-infrared images, but it may also be applied to thermal infrared data as discussed by the authors, and two approaches are reviewed: binary mixing and a more general treatment for isothermal mixtures of a greater number of components.

TL;DR: In this article, a review of the radiometric calibration methods for the NOAA AVHRR reflectance channels is presented and the results for the -7, -9 and -11 AVHRRs are summarized.

TL;DR: In this article, different methods for estimating land surface temperature for NOAA satellites data are presented using the infrared channels of the Advanced Very High-Resolution Radiometer (AVHRR).

TL;DR: In this paper, 11 Spectralon 1 and 16 BaSO4 reference reflectance panels were calibrated using a field calibration technique and the results showed that the reflectance of these panels varied considerably among panels, so much so that it was not feasible to develop general calibration equations.

TL;DR: In this article, the sensitivity of the Normalized Difference Vegetation Index (NDVI) and the Soil Adjusted Vegetation index (SAVI) to bidirectional measurements was assessed for purposes of improving remote temporal monitoring of vegetation dynamics.

TL;DR: The spectral ratio method as mentioned in this paper is based on the concept that although the spectral radiances are very sensitive to small changes in temperature the ratios are not, and only an approximate estimate of temperature is required thus, for example, we can determine the emissivity ratio to an accuracy of 1% with a temperature estimate that is only accurate to 12.5 K.

TL;DR: In this article, the authors used water quality data from Lake Chicot, Arkansas and a corresponding set of Landsat MSS data to compare the ability of satellite-based sensor systems to monitor suspended sediment concentration, Secchi disk depth, and nephelometric turbidity.

TL;DR: In this article, the authors consider the inference of vegetation status from measurements in the visible and near infrared, in the presence of variable soil reflectance, and propose a leaf vegetation index VL, having limits 0 nd 1, for the field case.

TL;DR: In this paper, the authors used the ratio of ASTER bands 10/14 to estimate particle size in soils, if other bands are used to minimize the confusion factors provided by soil moisture, vegetation cover, soil organic content, and the presence of abundant minerals other than quartz.

TL;DR: In this paper, a numerical method for solving the radiative transfer equation in three spatial dimensions was recently developed and analyzed for its numerical behavior, and the reliability of coding and accuracy of the algorithm are evaluated by benchmarking.

TL;DR: A new forest light interaction model that accounts for both shadowing and crown transparency is developed and results indicate that the model gives a fair representation of reality.