摘要:

The age of tropical secondary forests was estimated using a post-classification comparison of a multi-temporal sequence of Landsat sensor imagery for an area north of Manaus, Brazil. Five stages of regenerating secondary forest together with primary forest and agricultural land were identified. Most secondary forests at this site were younger than 14 years and therefore represented the regeneration stages at which carbon accumulation was at a maximum. This study has implications for the regional or global mapping of tropical secondary forests for global carbon studies.

ISSN:0143-1161    

DOI:10.1080/01431169308904419

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This letter describes a field investigation of the thermal infrared (8-14μm) emissivity at normal incidence of the type of fresh snowfall typical of the Arctic during winter. The results show that the emissivity varies between 0.70 and 0.92, in marked contrast to Arctic summer snow which has a constant emissivity of approximately 0·99.

ISSN:0143-1161    

DOI:10.1080/01431169308904420

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor