摘要:

Using LANDSAT data for different years between 1973 and 1983, vegetation change maps were produced for two areas in the vicinity of Inco's mining complexes. Field checking showed that for more than 80 per cent of the sites inspected, causes for the vegetation changes recorded on the maps could be determined. The system used provides a cost-effective method of monitoring major vegetation changes over a number of years, but it is not suitable for monitoring slow, progressive, vegetation changes over short periods.

ISSN:0143-1161    

DOI:10.1080/01431168708948649

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Remote sensing data can provide such a great deal of information on linear structures that one can apply a statistical and probability analysis studies of mineral deposits and other geological phenomena which are closely related to linear structures from remote sensing images. Many geological bodies and geological phenomena in nature are related only to linear structures, so that we can regard them as rare events occurring in a large number of random experiments that are considered as the linear structures in this test, and then analyse them using statistical and probability theories. This paper describes a method used by the author to predict the location of kimberlite which provides an important clue in searching for kimberlite in the study area.

ISSN:0143-1161    

DOI:10.1080/01431168708948650

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper describes procedures for characterizing agricultural crops and soils in remote sensing studies. The procedures are based on the accumulated experience of a number of researchers active in this field. Therefore, they represent a compromise between the theoretically desirable and the practically feasible, and should thus be an effective aid in further studies of this type. Although the guidelines were prepared specifically for microwave studies, adjustments were made to render the procedures applicable to optical studies as well. Given the increasing number of research teams involved in remote sensing applied to agriculture, there is an opportunity to acquire a broad data base on soils and crops in various geographic regions. To allow intercomparisons of such data, they must be obtained in a consistent manner. By following the proposed procedures and reporting results using the parameters described here, such intcrcomparisons should be possible on a continental or a global scale.

ISSN:0143-1161    

DOI:10.1080/01431168708948651

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this study the relationship between urban land use features and radar polarization was examined. Statistical tests were applied to density readings of HH-and HV-polarized X-band SAR imagery to determine: (1) differences in signal return among urban land use categories within a single polarization and (2) variations in signal return between polarizations for individual land use categories. Only one category produced a statistical difference between polarizations. Although some categories were separable on both polarizations, others were separable only on a single polarization. Possible reasons are discussed along with an observed clustering of classes by signal response/grey tone.

ISSN:0143-1161    

DOI:10.1080/01431168708948652

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In the interpretation of measured reflectance data it is important to consider those surface radiation effects which make a significant contribution to the overall irradiation pattern. A model was constructed for furrowed bare soil surfaces which includes the direct cross-radiation effect between the surface elements. According to the model computations performed the direct cross-radiation plays a significant role in the measured, reflected signal intensity. The computational method developed is suitable for including the direct cross-radiation effect in surface radiation models in the optical region.

ISSN:0143-1161    

DOI:10.1080/01431168708948653

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

An account is given of the present slate of remote sensing in Australia, covering the facilities and equipment, education and training, software and hardware developments, and research activities in the fields of agriculture, geology, disaster monitoring, surveying and cartography, land management, water conservation, oceanography and meteorology. This article is a shortened version of a publication produced by the Australian Trade Commission and published by the Australian Government Publishing Service (Walker et al. 1986).

ISSN:0143-1161    

DOI:10.1080/01431168708948654

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Imagery covering the Socompa volcano and debris avalanche deposit in northern Chile was acquired by MOMS-01 when the Sun was low in the western sky. Illumination from the west shows many important topographic features to advantage. These are inconspicuous or indistinguishable on LANDSAT TM images acquired at higher solar elevation. The effective spatial resolution of MOMS-01 is similar to that of the TM and its capacity for spectral discrimination is less. A technique has been developed to combine the multispectral information offered by TM with the topographic detail visible on MOMS-01 imagery recorded at a time of low solar elevation.

ISSN:0143-1161    

DOI:10.1080/01431168708948656

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Tropical burning often occurs in remote areas of the world. Satellite remote sensing is the only practical solution for detecting and monitoring this burning. In this paper we demonstrate the capability of the Advanced Very High Resolution Radiometer onboard the National Oceanic and Atmospheric Administration polar orbiting satellites for detecting tropical fire activity in the Manaus, Brazil area.

ISSN:0143-1161    

DOI:10.1080/01431168708948657

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Based on solar irradiance data published by Neckel and Labs (1984) and Iqbal (1983), the solar exoatmospheric irradiances for Thematic Mapper (TM) bands 1, 2, 3 and 4 have been calculated. Results vary by up to 1 per cent from our previously published values which were based on earlier data of Neckel and Labs. For TM bands 5 and 7, integrated solar exoatmospheric irradiances have also been recalculated using solar irradiance data published by Labs and Neckel (1968), Arvesenet al. (1969) and Iqbal (1983). These irradiances vary by up to 6 per cent from our previously published results, which were based on data published by Thekaekara (l972).

ISSN:0143-1161    

DOI:10.1080/01431168708948658

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Vegetation impedes the geological analysis of band ratio images, because it is both widely distributed in the surficial environment and can be spectrally similar to ferric oxides and clays when sampled by broad-band imaging devices. We address this problem by a technique we call ‘directed principal component analysis’ (DPCA) that involves calculating principal components on two input band ratio images. One ratio is a geological discriminant, conTused by the presence of vegetation; the second ratio is chosen for its suitability as a vegetation index. Once computed, the second DPC has the properties of a geological discriminant, but is less influenced by vegetation. The effects of vegetation, which are strongly correlated between the two input ratios, contribute chiefly to DPC#1. This simple method, applied selectively to airborne thematic mapper data, substantially reduces the effects of vegetation.

ISSN:0143-1161    

DOI:10.1080/01431168708948659

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor