ISSN:0143-1161    

DOI:10.1080/01431169208904078

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The Jabal Duhayyah area spans the contact between two tectonic zones of the southern Arabian Shield. By utilising principal components analysis of the Landsat-TM data, it was easy to locate this contact precisely as well as to improve and update available geological maps. Previously unmapped lithologics were distinguished and mapped during the processing of the images. Field-checking confirmed these findings and a new geological map was constructed.

ISSN:0143-1161    

DOI:10.1080/01431169208904079

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The desertic terrain of Rajaslhan, India, has been evaluated to work out the logistics relevant to planning a hydrocarbon exploration programme. The digitally enhanced, high-resolution Landsat-5 Thematic Mapper (TM) and SPOT data has helped in identifying various aeolian landforms. Sand dunes are most conspicuous. On the basis of sand-dune abundance, their amplitude, wavelength and direction, three land systems have been identified in the area. The gcomor-phic information extracted from the aforesaid satellite data has been used to assess each land sysem for its feasibility for seismic profiling, drill-site construction and groundwater location.

ISSN:0143-1161    

DOI:10.1080/01431169208904080

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

This paper presents the results of using Geostationary Operational Environmental Satellite (GOES) Visible Infrared Spin Scan Radiometer Atmospheric Sounder (VAS) data to monitor biomass burning associated with deforestation and grassland management in South America. The technique of Matson and Dozier has been adapted to GOES VAS short-wave and long-wave infrared window data to determine ihe size and temperature of fires associated with these activities. Although VAS data do not offer the spatial resolution available with Advanced Very High Resolution Radiometer (AVHRR) data (7 km versus I km) this decreased resolution does not seem to hinder the ability of the VAS instrument to delect fires; in some cases it proves to be advantageous, in that saturation does not occur as often. Sequences of VAS visible data are helpful in verifying that the hot spots sensed in the infrared are actually related to fires. Furthermore, the smoke of the fires can be tracked in time to determine their motion and trajectory. In this way, the GOES satellite offers a unique ability to monitor diurnal variations in fire activity and transport of related aerosols.

ISSN:0143-1161    

DOI:10.1080/01431169208904081

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Multi-frequency microwave radiometers (3-09, 5-4, 9-6, 36GHz) designed by the Changchun Institute of Geography have been used to measure dual-polarized brightness temperature of different crop canopies in the People's Republic of China. A numerical modelling of radiative transfer of multi-layer random media is developed. All parameters calculated by the empirical formulations arc chosen in a consistent way. Numerical results arc compared with the experimental measurements. The functional dependence of brightness tempera-lure on frequency, polarization, observation angle and crop parameters such as moisture content, crop height, etc. arc numerically discussed.

ISSN:0143-1161    

DOI:10.1080/01431169208904082

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The cultivation of irrigated rice provides ideal larval habitat for a number of anopheline vcclors of malaria throughout the world. Anopheles freeborni, a potential vector of human malaria, is associated with the nearly 240 000 hectares of irrigalcd rice grown annually in Northern and Central California; therefore, this species can serve as a model for the study of rice field anopheline population dynamics. Analysis of field dala revealed that rice fields with early season canopy development, that are located near bloodmcal sources (i.e., pastures with livestock) were more likely to produce anopheline larvae than fields with less developed canopies located further from pastures. Remote sensing reflectance measurements of early-season canopy development and geographic information system (GIS) measurements of distances between rice fields and pastures with livestock were combined to distinguish between high and low mosquito-producing rice fields. Using spectral and distance measures in cither a discriminant or Bayesian analysis, the identification of high mosquito-producing fields was made with 85 per cent accuracy nearly two months before anopheline larval populations peaked. Since omission errors were also minimized by these approaches, they could provide a new basis for directing abatement techniques for the control of malaria vectors.

ISSN:0143-1161    

DOI:10.1080/01431169208904083

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

A knowledge-based classification method was designed to improve crop classification accuracy. Crop data of preceding years, stored in a geographical information system (GIS) were used as ancillary data. Knowledge about crop succession, determined from crop rotation schemes, was formalized by means of transition matrices. The spectral data, the data from the GIS and the knowledge represented in the transition matrix were used in a modified Bayesian classification algorithm. The developed classification was tested in an agricultural region in The Netherlands. Depending on the spectral class discrimination, the accuracy of the knowledge-based classification was 6 to 20 percent better compared with a maximum likelihood classification.

ISSN:0143-1161    

DOI:10.1080/01431169208904084

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Methods for making more efficient use of synthetic aperture radar (SAR) imagery are considered. Local standard deviation and autocorrelation texture measures are used to provide information on the spatial variability in the scattering cross-section. Use of these statistics in a window of 180×180m improved classification success rates from 39 to 66 per cent with digitized shuttle imaging radar (S1R-A) data. Multispectral scanner (MSS) achieves 70 per cent success with the same window size and, by combining this with SAR, a 78 per cent success rate is reached.

ISSN:0143-1161    

DOI:10.1080/01431169208904085

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

Sile-to-site variability in the relation between remotely-sensed surface temperatures (T5) and the normalized difference spectral vegetation index (NDVI) of a tallgrass prairie was investigated. The primary objective was to determine whether the proportion of burnt/unburnt area within a sub-scene affected the T5-NDVI regression slope (SL), Regression analyses confirmed that burn treatments, particularly on steep slopes, were responsible for most of the observed variability inSLwhile soil moisture content and the forested areas also had a significant effect onSL.

ISSN:0143-1161    

DOI:10.1080/01431169208904086

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

The detectability of an object in the infrared spectral region is, next to its own thermal characteristics, determined by the thermal behaviour of the background (the thermodynamics of various elements, like grass, trees, soil, etc.). In this sense; the temperature and emissivity variation of these background elements as a function of position, viewing angle and time is of major importance. To enhance the understanding of the thermodynamics and directional emittance properties of backgrounds, measurements of background and meteorological parameters over long periods of time, covering a representative set of wealher data, are needed. For this purpose a dual-channel (3-5 and 8-12μm) radiometer was developed. To be able to perform measurements over long periods of time, the system was designed to operate in an automatic and autonomous way. Once the system has been programmed with the coordinates of the desired background elements, it automatically measures these every pre-set time interval. The system was fielded in April 1990 with a wealher station and has been operating undisturbed over a full year. System design and performance are discussed in this paper.

ISSN:0143-1161    

DOI:10.1080/01431169208904087

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor