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Erratum published on 18 July 2017, see Remote Sens. 2017, 9(7), 738.

Open AccessArticle
Remote Sens. 2017, 9(6), 546; doi:10.3390/rs9060546

Identifying Irrigated Areas in the Snake River Plain, Idaho: Evaluating Performance across Composting Algorithms, Spectral Indices, and Sensors

1
Department of Forest Resources and Environmental Conservation, Virginia Polytechnic Institute and State University, 310 West Campus Drive, Blacksburg, VA 24061-0324, USA
2
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725-1535, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Fabian Löw, Alexander Prishchepov, Florian Schierhorn, Clement Atzberger and Prasad S. Thenkabail
Received: 3 March 2017 / Revised: 22 May 2017 / Accepted: 25 May 2017 / Published: 1 June 2017
(This article belongs to the Special Issue Monitoring Agricultural Land-Use Change and Land-Use Intensity)
View Full-Text   |   Download PDF [8349 KB, uploaded 19 July 2017]   |  

Abstract

There are pressing concerns about the interplay between agricultural productivity, water demand, and water availability in semi-arid to arid regions of the world. Currently, irrigated agriculture is the dominant water user in these regions and is estimated to consume approximately 80% of the world’s diverted freshwater resources. We develop an improved irrigated land-use mapping algorithm that uses the seasonal maximum value of a spectral index to distinguish between irrigated and non-irrigated parcels in Idaho’s Snake River Plain. We compare this approach to two alternative algorithms that differentiate between irrigated and non-irrigated parcels using spectral index values at a single date or the area beneath spectral index trajectories for the duration of the agricultural growing season. Using six different pixel and county-scale error metrics, we evaluate the performance of these three algorithms across all possible combinations of two growing seasons (2002 and 2007), two datasets (MODIS and Landsat 5), and three spectral indices, the Normalized Difference Vegetation Index, Enhanced Vegetation Index and Normalized Difference Moisture Index (NDVI, EVI, and NDMI). We demonstrate that, on average, the seasonal-maximum algorithm yields an improvement in classification accuracy over the accepted single-date approach, and that the average improvement under this approach is a 60% reduction in county scale root mean square error (RMSE), and modest improvements of overall accuracy in the pixel scale validation. The greater accuracy of the seasonal-maximum algorithm is primarily due to its ability to correctly classify non-irrigated lands in riparian and developed areas of the study region. View Full-Text
Keywords: agriculture; classification algorithm; irrigation; Snake River Plain; water use agriculture; classification algorithm; irrigation; Snake River Plain; water use
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chance, E.W.; Cobourn, K.M.; Thomas, V.A.; Dawson, B.C.; Flores, A.N. Identifying Irrigated Areas in the Snake River Plain, Idaho: Evaluating Performance across Composting Algorithms, Spectral Indices, and Sensors. Remote Sens. 2017, 9, 546.

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