摘要:

The extraction of thematic information from TM images and the selection of optimal composition schemes have been subjects requiring deep research in the field of remote sensing. However, so far, there have been no complete sets of norms or standards to follow, especially, in the quantitative calculation and prediction of image colorimetry, as well as the related determination of optimal composition schemes. Using TM images and applying the separation exposure method, this paper discusses the standardization issue of extracting image thematic information, sets forward the method of quantitative calculation of colour difference and the theory of selecting the optimal composition scheme, and provides a corresponding mathematical model.

ISSN:0143-1161    

DOI:10.1080/014311697217855

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Rain affects wind retrievals from scatterometric measurements of the sea surface. To depict the additional roughness caused by rain on a wind driven surface, we use a ring-wave spectral model. This enables us to analyse the rain effect on Ku band scatterometric observations from two laboratory experiments. Calculations based on the small perturbation method provide good simulation of scattering measurements for the rain-only case, whereas for combined wind and rain cases, the boundary perturbation method is appropriate.

ISSN:0143-1161    

DOI:10.1080/014311697217864

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The aerosol optical depth data obtained by two methods are compared. The first method uses solar radiance measurements with the spectroradiometer Optronic OL752 installed inside the Santa Cruz de Tenerife Harbour (28.48 N, 16.24 W). The second one takes the solar radiation scattered by the atmosphere using the Advanced Very High Resolution Radiometer (AVHRR) radiometer channels on board the NOAA meteorological satellites. A 91 per cent correlation between the two procedures was obtained for channel 1 (630nm).

ISSN:0143-1161    

DOI:10.1080/014311697217873

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

The feasibility of correcting for errors in apparent extent of land cover types on coarse spatial resolution satellite imagery was analysed using a modelling approach. The size distributions for small burn scars mapped with two Landsat Multi-spectral Scanner (MSS) images and ponds mapped with an ERS-1 synthetic aperture radar (SAR) image were measured using geographical information system (GIS) software. Regression analysis showed that these size distributions could be modelled with two types of statistical distributions a power distribution and an exponential distribution. A comparison of the size distributions of small burn scars as observed with the Landsat MSS imagery to the distribution observed with National Oceanic and Atmospheric Administration (NOAA) Advanced Very High Resolution Radiometer (AVHRR) imagery indicated that distortions due to the coarse spatial resolution of AVHRR caused overestimation of the burn area. This bias was primarily caused by detection in two or three AVHRR pixels of burns whose actual size was on the order of a single AVHRR pixel. Knowledge of the type of the actual size distribution of small fragments in a scene and the causes of distortion may lead to methods for correcting area estimates involving models of the size distribution observed with coarse imagery and requiring little or no recourse to fine scale data.

ISSN:0143-1161    

DOI:10.1080/014311697217882

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor

摘要:

Estimating crop residue is important for soil conservation and tillage management. Remote sensing could provide the potential of estimating amount of crop residue using reflectance measurement and model simulation procedures. The purpose of this study was (1) to use the SAIL (Scattering by Arbitrarily Inclined Leaves) model to simulate crop residue reflectance from wheat, Triticum aestivum (L.), at visible and near-infrared wavelengths; and (2) to compare the simulated reflectance with field-measured reflectance for evaluating the simulation model. Simulated reflectance in visible and near-infrared wavebands was overestimated about 1 to 5 per cent, compared with measured reflectance in the field. However, overestimation was within the experimental errors. Results suggest that the SAIL model can be used to simulate crop residue reflectance in different wheat crop residue covers and that wheat crop residue cover could be estimated by inverting the model.

ISSN:0143-1161    

DOI:10.1080/014311697217891

出版商:Taylor & Francis Group    

年代:1997

数据来源: Taylor