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Open AccessArticle

Validating a Landsat Time-Series of Fractional Component Cover Across Western U.S. Rangelands

1
AFDS, Contractor to the U.S. Geological Survey (USGS) Earth Resources Observation and Science Center, Sioux Falls, SD 57198, USA
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U.S. Geological Survey (USGS) Earth Resources Observation and Science Center, Sioux Falls, SD 57198, USA
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KBRwyle, Contractor to the U.S. Geological Survey (USGS) Earth Resources Observation and Science Center, Sioux Falls, SD 57198, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(24), 3009; https://doi.org/10.3390/rs11243009
Received: 14 November 2019 / Revised: 10 December 2019 / Accepted: 12 December 2019 / Published: 13 December 2019
Western U.S. rangelands have been quantified as six fractional cover (0%–100%) components over the Landsat archive (1985–2018) at a 30 m resolution, termed the “Back-in-Time” (BIT) dataset. Robust validation through space and time is needed to quantify product accuracy. Here, we used field data collected concurrently with high-resolution satellite (HRS) images over multiple locations (n = 42) and years. Field observations were used to train regression tree models, predicting the component cover across each HRS image. Our objectives were to evaluate the spatial and temporal relationships between HRS and BIT component cover and compare spatio-temporal climate responses. First, for each HRS site-year (n = 77) we averaged both the HRS and BIT predictions within each site separately and regressed the averages to quantify the temporal accuracy. Next, we regressed individual pixel values of corresponding HRS and BIT predictions to quantify the spatio-temporal accuracy. Results showed strong temporal correlations with an average R2 of 0.63 and Root Mean Square Error (RMSE) of 5.47% as well as strong spatio-temporal correlations with an average R2 of 0.52 and RMSE of 7.89% across components. Our approach increased the validation sample size relative to direct comparison of field observations. Validation results showed robust spatio-temporal relationships between HRS and BIT data, providing increased user confidence in the data. View Full-Text
Keywords: fractional components; time-series; validation; remote sensing; rangelands fractional components; time-series; validation; remote sensing; rangelands
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Rigge, M.; Homer, C.; Shi, H.; K. Meyer, D. Validating a Landsat Time-Series of Fractional Component Cover Across Western U.S. Rangelands. Remote Sens. 2019, 11, 3009.

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