DOI: 10.1016/j.jag.2017.03.014
Scopus记录号: 2-s2.0-85027549337
论文题名: Where can pixel counting area estimates meet user-defined accuracy requirements?
作者: Waldner F ; , Defourny P
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2017
卷: 60 起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Area estimation
; Landscape fragmentation
; Pixel counting
; Resolution bias
; Spatial resolution
Scopus关键词: accuracy assessment
; areal interpolation
; estimation method
; fragmentation
; image classification
; landscape structure
; pixel
; satellite imagery
; spatial resolution
英文摘要: Pixel counting is probably the most popular way to estimate class areas from satellite-derived maps. It involves determining the number of pixels allocated to a specific thematic class and multiplying it by the pixel area. In the presence of asymmetric classification errors, the pixel counting estimator is biased. The overarching objective of this article is to define the applicability conditions of pixel counting so that the estimates are below a user-defined accuracy target. By reasoning in terms of landscape fragmentation and spatial resolution, the proposed framework decouples the resolution bias and the classifier bias from the overall classification bias. The consequence is that prior to any classification, part of the tolerated bias is already committed due to the choice of the spatial resolution of the imagery. How much classification bias is affordable depends on the joint interaction of spatial resolution and fragmentation. The method was implemented over South Africa for cropland mapping, demonstrating its operational applicability. Particular attention was paid to modeling a realistic sensor's spatial response by explicitly accounting for the effect of its point spread function. The diagnostic capabilities offered by this framework have multiple potential domains of application such as guiding users in their choice of imagery and providing guidelines for space agencies to elaborate the design specifications of future instruments. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79979
Appears in Collections: 气候变化事实与影响
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作者单位: Université catholique de Louvain, Earth and Life Institute-Environmental Sciences, Louvain-la-Neuve, Belgium
Recommended Citation:
Waldner F,, Defourny P. Where can pixel counting area estimates meet user-defined accuracy requirements?[J]. International Journal of Applied Earth Observation and Geoinformation,2017-01-01,60