Journal
REMOTE SENSING OF ENVIRONMENT
Volume 165, Issue -, Pages 234-248Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.rse.2015.01.018
Keywords
Validation database; Global land cover; High resolution satellite; Continuous field data; Landsat; Tree cover; Accuracy assessment
Funding
- USGS Land Remote Sensing and Land Change Science Programs under USGS [G10PC00044, G13PC00028]
- Cooperative Ecosystems Study Unit grant
- USGS
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The methodology for selection, creation, and application of a global remote sensing validation dataset using high resolution commercial satellite data is presented. High resolution data are obtained for a stratified random sample of 500 primary sampling units (5 km x 5 km sample blocks), where the stratification based on Koppen climate classes is used to distribute the sample globally among biomes. The high resolution data are classified to categorical land cover maps using an analyst mediated classification workflow. Our initial application of these data is to evaluate a global 30 m Landsat-derived, continuous field tree cover product. For this application, the categorical reference classification produced at 2 m resolution is converted to percent tree cover per 30 m pixel (secondary sampling unit)for comparison to Landsat-derived estimates of tree cover. We provide example results (based on a subsample of 25 sample blocks in South America) illustrating basic analyses of agreement that can be produced from these reference data. Commercial high resolution data availability and data quality are shown to provide a viable means of validating continuous field tree cover. When completed, the reference classifications for the full sample of 500 blocks will be released for public use. (C) 2015 Elsevier Inc All rights reserved.
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