Checking for non-preferred file/folder path names (may take a long time depending on the number of files/folders) ...

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


Authors:
Owners: This resource does not have an owner who is an active HydroShare user. Contact CUAHSI (help@cuahsi.org) for information on this resource.
Type: Resource
Storage: The size of this resource is 5.8 MB
Created: Feb 12, 2021 at 5:26 a.m.
Last updated: Feb 08, 2024 at 5:18 p.m.
DOI: 10.4211/hs.db248589a52a41c4a6f387bbefbab3a9
Citation: See how to cite this resource
Content types: Geographic Raster Content 
Sharing Status: Published
Views: 540
Downloads: 62
+1 Votes: Be the first one to 
 this.
Comments: No comments (yet)

Abstract

Two dams located on the Elwha River in Washington state were removed from 2011 to 2014. 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 output river mask raster data were created using publicly available aerial imagery from the National Agricultural Imagery Program. First, supervised classification was performed to classify all water, non-water (vegetation, bare soil, and urban), water shadow, and non-water shadow pixels. The clear water and shadow water pixels were then reclassified as one, and finally, pixels around bridge cross sections, and additional misclassified pixels were manually corrected for each time period.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
48.1612°
East Longitude
-123.5350°
South Latitude
47.9678°
West Longitude
-123.6206°

Content

README.txt

Title: Elwha River Dam Removal - Morphological Evolution River Masks

Description:
This resource provides river mask data capturing the morphological evolution of the Elwha River in Washington state, specifically focusing on the impact of the removal of two dams between 2011 and 2014. The dataset includes a river mask prior to dam removal in 2011, along with subsequent mask files from 2013, 2015, and 2017.

Content:
The river mask raster data were generated using publicly available aerial imagery sourced from the National Agricultural Imagery Program. The processing involved a series of steps, beginning with supervised classification to categorize pixels into water, vegatation, bare soil + urban, water shadow, and non-water shadow classes. Subsequently, clear water and shadow water pixels were merged. Finally, manual corrections were applied to pixels around bridge cross-sections and specific misclassifications for each time period.

Temporal Coverage:

Pre-removal (2011)
Post-removal (2013, 2015, 2017)

Data Processing Steps:

Supervised classification used to identify water, vegatation, bare soil + urban, water shadow, and non-water shadow pixels.
Merging clear water and shadow water pixels.
Manual corrections for pixels around bridge cross-sections and certain misclassifications.

Data Source:
National Agricultural Imagery Program (NAIP) aerial imagery. Bands in the visible spectrum (Red, Green, and Blue) were used for supervised classification.

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.

Related Resources

This resource is described by Sharma, A. (2023). Development and Validation of an Integrated Modeling Approach to Reconstruct the Propagation of Fluvial Sediment Pulses After Dam Removals.

Credits

Contributors

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 (2024). River mask before and after the Elwha dam removals, WA., HydroShare, https://doi.org/10.4211/hs.db248589a52a41c4a6f387bbefbab3a9

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

http://creativecommons.org/licenses/by/4.0/
CC-BY

Comments

There are currently no comments

New Comment

required