A demonstration of the utility of Landsat imagery for quickly and cheaply estimating irrigated land area was conducted in the Klamath River basin of Oregon. Landsat color composite images, at 1:250,000 scale and acquired on two dates during the 1975 growing season, were interpreted. Irrigated lands were delineated manually, and the irrigated area was estimated, based on dot-grid sampling of the manually delineated lands. The image interpretation estimate of irrigated area was then adjusted by a comparison of interpretation results with ground data on 45 sample plots, each 1 mi2 (2.6 km2) in size.
Two interpreters independently estimated the irrigated area. Their adjusted estimates were 285,000 acres (115,000 ha) and 267,000 acres (108,000 ha) respectively, with corresponding 95 percent confidence intervals of ±19,500 acres (7,880 ha) and ±34,700 acres (14,000 ha). The estimated cost of the survey, exclusive of management costs and training, was $1,500.
Additional publication details
|Publication Subtype||USGS Numbered Series|
|Title||Monitoring irrigated land acreage using Landsat imagery: an application example|
|Series title||Open-File Report|
|Publisher||U.S. Geological Survey|
|Contributing office(s)||Earth Resources Observation and Science (EROS) Center|
|Description||iv, 25 p.|
|Other Geospatial||Crater Lake, Klamath Lake|
|Online Only (Y/N)||N|
|Additional Online Files (Y/N)||N|