Variability and trends in irrigated and non-irrigated croplands in the central U.S

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Abstract

Over 23 million hectares (233 thousand km2) of U.S. croplands are irrigated and there was an overall net expansion of 522 thousand hectares nationally from 2002 to 2007. Most of this expansion occurred across the High Plains Aquifer (HPA) in the central Great Plains. Until recently, there has been a lack of geospatially-detailed irrigation data that are consistent, timely, geographically extensive, and periodic to support studies linking agricultural land use change to crop yields, aquifer water use, and other factors. We employed a modeling approach implemented at two time intervals (2002 and 2007) to map irrigated agriculture across the conterminous U.S. at a sub-county spatial detail (250 m2 spatial resolution). The model integrated U.S. Department of Agriculture (USDA) county statistics, satellite imagery, and a national land cover map. The geospatial model output, called the Moderate Resolution Imaging Spectroradiometer (MODIS) Irrigated Agriculture Dataset for the United States (MIrAD-US), was then used to depict detailed spatial patterns of irrigation change across the HPA from 2002 to 2007. Spatial changes in irrigation may result in shifts in local and regional climate, groundwater depletion, and higher crop yields and farm income. A closer investigation of irrigated corn across the HPA from 2000 to 2012 revealed even more variability through time, underscoring the need for more frequent periodic mapping of irrigated agriculture.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Variability and trends in irrigated and non-irrigated croplands in the central U.S
ISBN 978-1-4799-0868-4
DOI 10.1109/Argo-Geoinformatics.2013.6621888
Year Published 2013
Language English
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Publisher location Piscataway, NJ
Contributing office(s) Earth Resources Observation and Science (EROS) Center
Description 4 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Information for sustainable agriculture, International Conference on Agro-Geoinformatics, 2nd, Fairfax, Va., 12–16 August 2013, Proceedings
First page 102
Last page 105
Conference Title Second International Conference on Agro-Geoinformatics
Conference Location Fairfax, VA
Conference Date August 12-16, 2013