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River mask before and after the Elwha dam removals, WA.

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Type: Resource
Storage: The size of this resource is 5.8 MB
Created: Feb 12, 2021 at 5:26 a.m.
Last updated: Jul 21, 2021 at 8:34 p.m.
Citation: See how to cite this resource
Content types: Geographic Raster Content 
Sharing Status: Public
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The Elwha dam removals consisted one of the largest dams removed in history due to economical and ecological reasons. This resource contains a river mask prior to the removal in 2011 and three subsequent mask files from 2013, 2015, and 2017 showing the morphological evolution of the channel. The raster data were created using publicly available NAIP imagery. First, supervised classification was performed to classify all water, non-water, water shadow, and non-water shadow pixels. The clear water and shadow water pixels were then reclassified as one, and finally, raster painting was performed on bridge cross sections etc to make sure that the mask accurately shows water pixels for each time period.

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Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
East Longitude
South Latitude
West Longitude


Data Services

The following web services are available for data contained in this resource. Geospatial Feature and Raster data are made available via Open Geospatial Consortium Web Services. The provided links can be copied and pasted into GIS software to access these data. Multidimensional NetCDF data are made available via a THREDDS Data Server using remote data access protocols such as OPeNDAP. Other data services may be made available in the future to support additional data types.



People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Celso Castro Bolinaga North Carolina State University Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC, 27606.

How to Cite

Sharma, A., C. Castro-Bolinaga (2021). River mask before and after the Elwha dam removals, WA., HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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