2015_Glacier margins derived from 2015 satellite imagery for the named glaciers of Glacier National Park, MT and environs.

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Resource Abstract:
description: These polygon features represent digitization of the glacier margins for the 37 named glaciers of Glacier National Park (GNP) and two glaciers on U.S. Forest Service s Flathead National Forest land, derived from 2015 satellite imagery. The polygons represent only the main body portion of each glacier as it appeared in 2015 satellite imagery. Disconnected patches are not included as this dataset represents only the main body features of the named glaciers in GNP and environs. Polygons were digitized from WorldView imagery acquired on the following source dates: 20150822, 20150912, 20150915, 20150925 (World View 01 satellite). Initial digitization was completed by Melissa Brett, PSU graduate student. This set of polygons represents revisions based on supplemental imagery (20140825, 20141019, 20160915 - WorldView-01, oblique images in USGS collection, GoogleEarth collection), and local knowledge and interpretation by Dan Fagre and Lisa McKeon (USGS) in February - August, 2016. A Wacom Pro digital tablet was used by USGS staff to trace outlines and make revisions to the PSU margins. Glaciers were digitized at 1:2000 scale, with lowest off-nadir image chosen when multiple WorldView images were available for the same day. File attributes list specific photos used in analysis, including documentation of the off-nadir angle to determine imagery used. Since multiple images in time series contribute to this analysis, if previous image showed perennial snow that was absent from the glacier (bedrock visible), then that portion was deemed "seasonal/perennial snow" in subsequent photos and not included in the digitization of 2015 glacier margins.; abstract: These polygon features represent digitization of the glacier margins for the 37 named glaciers of Glacier National Park (GNP) and two glaciers on U.S. Forest Service s Flathead National Forest land, derived from 2015 satellite imagery. The polygons represent only the main body portion of each glacier as it appeared in 2015 satellite imagery. Disconnected patches are not included as this dataset represents only the main body features of the named glaciers in GNP and environs. Polygons were digitized from WorldView imagery acquired on the following source dates: 20150822, 20150912, 20150915, 20150925 (World View 01 satellite). Initial digitization was completed by Melissa Brett, PSU graduate student. This set of polygons represents revisions based on supplemental imagery (20140825, 20141019, 20160915 - WorldView-01, oblique images in USGS collection, GoogleEarth collection), and local knowledge and interpretation by Dan Fagre and Lisa McKeon (USGS) in February - August, 2016. A Wacom Pro digital tablet was used by USGS staff to trace outlines and make revisions to the PSU margins. Glaciers were digitized at 1:2000 scale, with lowest off-nadir image chosen when multiple WorldView images were available for the same day. File attributes list specific photos used in analysis, including documentation of the off-nadir angle to determine imagery used. Since multiple images in time series contribute to this analysis, if previous image showed perennial snow that was absent from the glacier (bedrock visible), then that portion was deemed "seasonal/perennial snow" in subsequent photos and not included in the digitization of 2015 glacier margins.
Citation
Title 2015_Glacier margins derived from 2015 satellite imagery for the named glaciers of Glacier National Park, MT and environs.
creation  Date   2018-05-21T08:59:05.673802
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URL: https://dx.doi.org/10.5066/F7P26WB1
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URL: https://dx.doi.org/10.5066/F7P26WB1
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Metadata data stamp:  2018-08-06T23:24:12Z
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notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based on a transform by Damian Ulbricht. Run on 2018-08-06T23:24:12Z
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Metadata record identifier:  urn:dciso:metadataabout:946e73ff-7573-4c2f-931c-259df0678735

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