ISSN:0143-1161    

DOI:10.1080/01431168708954825

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708954826

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0143-1161    

DOI:10.1080/01431168708954827

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The advantages of registering NOAA-AVHRR imagery to the world graticule of latitude and longitude using equal area radial projections are described and illustrated with normalized difference vegetation index imagery.

ISSN:0143-1161    

DOI:10.1080/01431168708954829

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Information acquired using a Daedalus AADS 1230 thermal infrared scanner flown at three different altitudes has been analysed with a view to determining whether these data could be used to determine path transmittance and radiance with subsequent correction of the remotely-sensed radiant temperatures for atmospheric effects. The results are given and it is demonstrated that under conditions of the type described the variation of surface temperature with time for a variety of surface types proved to be greater than the correction necessitated by path effects. It is concluded that this method of atmospheric correction is unsuitable whenever changes of surface temperature of the order of 1 deg K or more take place within the time span of the data acquisition. The examples given illustrate four such cases but in practice no surface was observed during this survey which did not show such variation.

ISSN:0143-1161    

DOI:10.1080/01431168708954830

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

An empirical relationship is developed between the difference of vertically and horizontally polarized brightness temperatures (ΔT) observed at 37 GHz frequency of the Scanning Multichannel Microwave Radiometer (SMMR) on board the Nimbus-7 satellite and primary productivity over hot arid and semi-arid regions of Africa and Australia. The primary productivity values for this empirical relationship are calculated according to Leith (1975). The empirical relationship is then used, together with the observed ΔT, to estimate primary productivity over a roughly 60000 km2area in the Thar Desert from 1979 to 1985. The highest areally averaged productivity of 0.368kgm−2yr−1is estimated for 1979, while the lowest 0.222kgm−2yr−1for 1985; the average for the 7 years being 0.271 kgm−2yr−1. The spatial variability of the productivity values within the study area is found to be quite substantial; the standard deviation about the mean being about 008kgm−2yr−1.

ISSN:0143-1161    

DOI:10.1080/01431168708954831

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor