ISSN:0143-1161    

DOI:10.1080/01431169008955037

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A new basis for the relationship between the (vertical) earthview E of cloud amount and the (whole dome) skycoverSof cloud amount has been sought. Over 4500 all-sky camera photographs, representing a considerable range of seasonal and climatological conditions, have been analysed to give rise to a database from which predictive relationships have been established. Cubic functions are the most soundly based both physically and empirically. We find

ISSN:0143-1161    

DOI:10.1080/01431169008955038

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Spatial co-occurrence matrices were computed for a SPOT HRV multispectral image for a moderate-relief environment in eastern Canada. The texture features entropy and inverse difference moment were used with the spectral data in landcover classification, and substantive increases in accuracy were noted. These range from 10 per cent for exposed bedrock to over 40 per cent in forest and wetland classes. The average classification accuracies were increased from 511 per cent (spectral data alone) to 86.7 per cent (spectral data plus entropy measured in band 2 and inverse difference moment in band 3). Classes that are homogeneous on the ground were characterized adequately by spectral tone alone, but classes containing mixed vegetation patterns or strongly related to structure were characterized more accurately by using a mixture of spectral tone and texture.

ISSN:0143-1161    

DOI:10.1080/01431169008955039

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor