摘要:

An approach is presented for characterizing the urban environment surrounding 1221 US Historical Climatology Network (US HCN) stations using light frequency data from the Defense Meteorological Satellite ProgramOperational Linescan System (DMSP-OLS) sensor. Each grid cell of the DMSPOLS data was thresholded into urban, suburban and rural categories. Categorized cell groups within 15 km of each US HCN station were input into a decision logic to categorize the station. The station categorization was compared with existing and derived categorizations using station metadata and 1990 Census Bureau population density data.

ISSN:0143-1161    

DOI:10.1080/014311698214127

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Two major factors are likely to impact the utilisation of remotely sensed data in the near future: (1) an increase in the number and availability of commercial and non-commercial image data sets with a range of spatial, spectral and temporal dimensions, and (2) increased access to image display and analysis software through GIS. A framework was developed to provide an objective approach to selecting remotely sensed data sets for specific environmental monitoring problems. Preliminary applications of the framework have provided successful approaches for monitoring disturbed and restored wetlands in southern California.

ISSN:0143-1161    

DOI:10.1080/014311698214136

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Multi-temporal radar backscatter characteristics of crops and their underlying soils were analysed for an agricultural area in south-western Ontario, Canada using nine dates of ERS-1 SAR imagery acquired during the 1993 growing season. From the calibrated data, SAR temporal backscatter profiles were generated for each crop type. The results indicate that small changes in incidence-angle can have strong impacts on radar backscatter. Thus, attention must be given to local incidence-angle effects when using ERS-1 SAR data,especially when comparing backscatter coefficients of the same area from different scenes or different areas within the same scene.

ISSN:0143-1161    

DOI:10.1080/014311698214145

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor