Land-use in the Willamette Valley from 2004-2017

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  • The Willamette Valley, bounded on the west by the Coast Range and on the east by the Cascade Mountains, is the largest river valley completely confined to Oregon. The fertile valley soils combined with a temperate, marine climate create ideal agronomic conditions for seed production. Historically, seed cropping systems in the Willamette Valley have focused on the production of grass and forage seeds. In addition to growing over two-thirds of the nation’s cool-season grass seed, cropping systems in the Willamette Valley include a diverse rotation of over 250 seed commodities for forage, food, and cover cropping applications. Tracking the sequence of crop rotations that are grown in the Willamette Valley is paramount to answering a broad spectrum of agronomic, environmental, and economical questions. Landsat images covering an area of 25,303 were used to identify agricultural crops in production from 2004 to 2017. The agricultural crops were distinguished by classifying images acquired by three platforms: Landsat 5 for the 2003-2013 period, Landsat 7 for the 2003-2017 period, and Landsat 8 for the 2013-2017 period. Before classification, the images acquired by the Landsat 7 were pre-processed by using a procedure to reduce the impact of the scan line corrector failure (Mueller Warrant 2019). The corrected images were subsequently used in classification of 61 different land use classes, namely 4 super-classes and 57 regular classes. The land was classified into annual crops (19 classes), perennial crops (20 classes), forests (13 classes), and urban developments (5 classes). Annual drive-by ground truth efforts validated the classifications and were used to develop object-based procedures to improve accuracy (Meuller-Warrant et al. 2017). References Mueller-Warrant, George. "Multistep block mapping on principal component uniformity repairs Landsat 7 defects." International Journal of Applied Earth Observation and Geoinformation 79 (2019): 12-23. Mueller-Warrant, George W., Kristin M. Trippe, Gerald W. Whittaker, Nicole P. Anderson, and Clare S. Sullivan. "Spatial methods for deriving crop rotation history." International journal of applied earth observation and geoinformation 60 (2017): 22-37.
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  • Strimbu, B. M., Mueller-Warrant, G., Trippe, K. (2021) Land-use in the Willamette Valley from 2004-2017 [Dataset]. Oregon State University
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Hydrologic Unit Code
  • 170900
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  • USDA - McIntire-Stennis
  • Agricultural Research Service
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  • The methodology used to derive the land classes and the ground truth are presented in Strimbu, B. M., Mueller-Warrant, G., Trippe, K. (2020) Agricultural crop change in the Willamette Valley, Oregon, from 2004 to 2017. Data.



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