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Difficulties with estimating city-wide urban forest cover change from national, remotely-sensed tree canopy mapsAuthor(s): Jeffrey T. Walton
Source: Urban Ecosystems. 11:81-90.
Publication Series: Scientific Journal (JRNL)
Station: Northern Research Station
PDF: Download Publication (247.74 KB)
DescriptionTwo datasets of percent urban tree canopy cover were compared. The first dataset was based on a 1991 AVHRR forest density map. The second was the US Geological Survey's National Land Cover Database (NLCD) 2001 sub-pixel tree canopy. A comparison of these two tree canopy layers was conducted in 36 census designated places of western New York State. Reference data generated by photo-interpreting the tree cover on 1994 and 2002 orthoimages were compared on a city-wide basis to estimates of the tree cover derived from the AVHRR and NLCD tree canopy maps. Comparison of the AVHRR-based estimate with the 1994 photo-interpreted reference showed low accuracy and high variability. The comparison between the NLCD-derived estimate and 2002 photo-interpreted values had higher accuracy but shows a consistent under prediction bias for all tree cover values. In comparing the two photo-interpreted reference sets, little actual change was detected for this study region. Assessing change using differences between the imagery-based AVHRR and NLCD urban tree cover datasets is shown to lead to erroneous results.
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CitationWalton, Jeffrey T. 2008. Difficulties with estimating city-wide urban forest cover change from national, remotely-sensed tree canopy maps. Urban Ecosystems. 11:81-90.
Keywordsurban tree canopy cover, change detection, accuracy assessment, NLCD 2001 tree canopy cover, AVHRR
- Evaluating the national land cover database tree canopy and impervious cover estimates across the conterminous United States: a comparison with photo-interpreted estimates
- Assessment of 2001 NLCD percent tree and impervious cover estimates
- Comparative assessment of methods for estimating tree canopy cover across a rural-to-urban gradient in the mid-Atlantic region of the USA
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