Simultaneous retrieval of surface parameters by model inversion

The estimation of biophysical parameters of vegetation canopies from optical remote sensing data is very important for the study of land surface processes. Traditionally, this has been realised mostly by means of spectral indices, e.g. the normalised difference vegetation index (NDVI), which is derived from spectral reflectances or radiances in...

Spectral PPCA transform and spatial wavelets using lifting technique for data compression of digital hyperspectral images

Lifting has been recognised as an effective numerical technique to realise linear transformations to digital data in integer-to-integer form, which guarantees perfect reversibility. When applied to decorrelate digital hyperspectrai images in the spectral and spatial domains, lifting can be applied to accomplish lossless data compression....

Theory of radiative transfer models applied in optical remote sensing of vegetation canpioes

Remote sensing asssisted sugar beet yield forcasting: Revised edition

Caesar: Evaluation of the dual-look concept

Informatie-extractie uit multispectrale beelden met behulp van stralingsinteractiemodellen

In dit rapport wordt ingegaan op de mogelijkheden van het extraheren van kwantitatieve informatie uit multispectrale beelden van begroeide gebieden via het gebruik van stralingsinteractiemodellen. Aan de hand van Landsat Thematic Mapper beelden wordt aangetoond dat het door middel van calibratie en atmosfeercorrectie mogelijk is reflectiebeelden...

Measurements on directional reflectance and aquisition of stereo information by CAESAR

CAESAR, a multispectral pushbroom-scanner, was developed in The Netherlands within the framework of the National Remote Sensing Programme. In 1988 the scanner became available for specific remote sensing research. CAESAR is capable of obtaining information on the directional reflectance of objects on the ground by the acquisition of...

Numerical accuracy of a two-stream radiative transfer model from comparison with an N-stream model

In the past, a relatively simple radiative transfer model, based on scattering and extinction of two semi-isotropic diffuse fluxes and two direct fluxes (solar beam and radiance in the viewing direction), has been applied to vegetation canopies and to the atmosphere. This model takes little computing power, but its numerical accuracy had not yet...

Het gebruik van Landsat-TM opnamen voor detectie van ruimtebegrenzende elementen ten behoeve van de landschapsbeeldkartering

Final report study of synthetic aperture radar data compression and encoding: part III: performance evaluation of speckle suppression and data compression algorithms

Rate distortion bounds are derived for SAR images and compared with the rate versus distortion relations obtained with the speckle suppression and data compression algorithm described in Part II. A method is given for optimally processing multispectral SAR-images. The method makes use of the spectral correlation between the mean return power...

Final report on study, design and evaluation of data reduction by encoding or information extraction: part IV: performance demonstration

In this part IV a number of visual and numerical results of data compression techniques are presented. The results are presented for multispectral, multiframe and non-imagery data as well as theoretically derived (artificial) data.

A scene radiation model based on four-stream radiative transfer theory

A simple analytical four-stream radiative transfer model based on Suits's differential equations is applied to the atmosphere-earth system in order to investigate the effects of the atmosphere and the view angle on remotely sensed multispectral radiance data from vegetation canopies. This scene radiation model is composed of two atmospheric...

Evaluation of ground-based hot-spot reflectance measrements for biomass determination of agricultural crops

Canopy reflectance simulation studies have demonstrated that a simplified relation between leaf area index and reflectance exists for the hot-spot observed at a zenith angle of approximately 52°. Based on this principle a prototype ground-based hot-spot reflectance meter (HSM) has been developed and tested, The objective of the project is to...

Earth observation modelling based on layer scattering matrices

The differential equations describing radiative transfer in vegetative canopies as given by G.H. Suits are generalized and solved to derive a layer scattering matrix. Layer scattering matrices can be applied to the calculation of optical parameters for multilayer ensembles according to the Adding method. The application to atmospheric scattering...

Light scattering by leaf layers with application to canopy reflectance modelling: The SAIL model

The scattering and extinction coefficients of the SAIL canopy reflectance model are derived for the case of a fixed arbitrary leaf inclination angle and a random leaf azimuth distribution. The SAIL model includes the uniform model of G.H. Suits as a special case and its main characteristics are that agronomicvariables like the leaf area index...

Hot-spot reflectance measurements applied to green biomass estimation and crop growth monitoring

A new ground-based hot-spot reflectance meter (HSM) has been developed and tested for the estimation of green crop biomass and for crop growth monitoring. The concept of the HSM is based on theoretical studies on canopy hotspot reflectance measurements for a selected oblique illumination and view angle of 52° with respect to the vertical. A...

Een remote sensing dataverwerkingsstysteem voor de Nederlandse gebruiker: Een studie naar systeemmogelijkheden en kosten

On behalf of the National Coordinating Committee for Remote Sensing (BCRS) and the Netherlands Agency for Aerospace Programs (NIVR) a study was conducted on a remote sensing digital image processing facility (RESEDA) to resolve the present bottleneck in the Dutch remote sensing activities. A user-oriented configuration is deduced from an...

Het meten van lichtreflecties van gewassen

Measurement of an object's reflectance spectrum can provide information on its nature and qualities. However, one should thoroughly take into account the fact that in general the reflectance spectrum does not only depend on the object itself, but also on the parameters defining the measurement conditions, like the spectral and spatial...