Graduate Project

 

Comparison and accuracy assessment of wetland land cover classification systems in the Willamette Valley, Oregon Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_projects/5712m734d

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  • The purpose of this study was to better understand the level of wetland classification consistency among three different land cover layers created using Geographical Information System (GIS) and remote sensor technology. Where inconsistencies in data existed, the goal was to identify the kinds of inconsistencies that occur. The results were focused on wetland land cover classes used for habitat identification and suitability studies. A GIS was used to help manage and combine the data from the three different systems spatially. The different land cover classification systems used were: 1) the Oregon Department of Fish and Wildlife Classification System (ODFW), 2) the National Wetlands Inventory (NWI) and 3) the Pacific Northwest Ecosystem Consortium's Classification (ERC/ARA). Digital orthophotos and site visits were used to verify the accuracy of a stratified random sample of the areas identified as wetlands by each system. From this verification process inferences about the relative accuracy of each system of classification were made. Data on the 1) total area and frequency of wetland polygons; 2) types of wetlands; 3) spatial agreement; 4) uniquely identified wetlands, and 5) strengths and weaknesses (comparison between verification system classifications and stratified random sample with field verified data) were analyzed and compared for the three land covers.
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