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A multitemporal (1979-2009) land-use/land-cover dataset of the binational Santa Cruz Watershed

Open-File Report 2011-1131

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Abstract

Trends derived from multitemporal land-cover data can be used to make informed land management decisions and to help managers model future change scenarios. We developed a multitemporal land-use/land-cover dataset for the binational Santa Cruz watershed of southern Arizona, United States, and northern Sonora, Mexico by creating a series of land-cover maps at decadal intervals (1979, 1989, 1999, and 2009) using Landsat Multispectral Scanner and Thematic Mapper data and a classification and regression tree classifier. The classification model exploited phenological changes of different land-cover spectral signatures through the use of biseasonal imagery collected during the (dry) early summer and (wet) late summer following rains from the North American monsoon. Landsat images were corrected to remove atmospheric influences, and the data were converted from raw digital numbers to surface reflectance values. The 14-class land-cover classification scheme is based on the 2001 National Land Cover Database with a focus on "Developed" land-use classes and riverine "Forest" and "Wetlands" cover classes required for specific watershed models. The classification procedure included the creation of several image-derived and topographic variables, including digital elevation model derivatives, image variance, and multitemporal Kauth-Thomas transformations. The accuracy of the land-cover maps was assessed using a random-stratified sampling design, reference aerial photography, and digital imagery. This showed high accuracy results, with kappa values (the statistical measure of agreement between map and reference data) ranging from 0.80 to 0.85.

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A multitemporal (1979-2009) land-use/land-cover dataset of the binational Santa Cruz Watershed
Series title:
Open-File Report
Series number:
2011-1131
Year Published:
2011
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Western Geographic Science Center
Description:
iv, 25 p.; Appendix; Readme File; Metadata; ZIP Data
First page:
i
Last page:
26
Number of Pages:
30
Country:
United States;Mexico
State:
Arizona
Online Only (Y/N):
Y
Additional Online Files(Y/N):
Y