Skip to main content
Advanced Search

Filters: Tags: {"type":"Theme"} (X)

9 results (623ms)   

View Results as: JSON ATOM CSV
The “Glaciers of Glacier National Park Repeat Photography Collection” is a compilation of photographs documenting the retreat of glaciers in Glacier National Park, Montana, U.S.A. (GNP) through repeat photography. The collection is comprised of 57 image pairs, resulting from twenty-two years of U.S.Geological Survey (USGS) field excursions (1997-2019) for the purpose of photographically documenting glacier change. Historic images of glaciers were located at the USGS Photographic Library, GNP Archives, and the University of Montana Special Collections. Employees and volunteers of the USGS Repeat Photography Project relocated the site of each historic photograph and re-photographed the image to create a historic-contemporary...
thumbnail
The 1966 polygons included in this data release represent the main body portion of the 37 named glaciers of Glacier National Park (GNP) and 2 named glaciers on the U.S. Forest Service’s Flathead National Forest land. This is a subset of the original mapping effort derived from 1:24000 scale mapping of named glaciers and permanent snowfields within Glacier National Park, Montana which were digitized by Richard Menicke (Glacier National Park) and Carl Key (U.S. Geological Survey) in 1993. These data are based on USGS 7.5 minute quadrangle mapping published from 1966 through 1968 which were the result of the earliest park-wide aerial surveys of snow and ice features in GNP. Examination of the aerial photographs shows...
thumbnail
This data release consists of a time series of digitized 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. The polygons represent the main body portion of each glacier as analyzed from aerial imagery from the years 1966, 1998, 2005 and 2015. Disconnected patches are not included as this dataset represents only the main body features of the named glaciers in GNP and environs. File attributes list specific source imagery.
thumbnail
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 2005 NAIP imagery. The polygons represent only the main body portion of each glacier as it appeared in 2005 NAIP 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 NAIP imagery acquired on the following source dates: 20050731, 20050826, 20050827. Initial digitization was completed by Kristina A Dick, Portland State University graduate student. This set of polygons represents revisions...
thumbnail
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...
thumbnail
These polygon features represent the maximum extent of glaciers in Glacier National Park and two glaciers on U.S. Forest Service’s Flathead National Forest land during the peak of the Little Ice Age (mid-nineteenth century). Glacial margins are based on moraine deposits that result from active glaciation, and do not depict perennial snow and ice. The criteria used for determining which moraines constituted a former glacier were a) whether a terminal moraine was present, and b) whether the glacier area was five aces or more. Moraines were digitized based on the best available imagery, including WorldView imagery acquired between 2015 and 2017, border Imagery from the Department of Homeland Security acquired in 2009...
thumbnail
These polygon features represent the maximum extent of the 37 named glaciers in Glacier National Park and two glaciers on U.S. Forest Service’s Flathead National Forest land during the peak of the Little Ice Age (mid-nineteenth century). Glacial margins are based on moraine deposits that result from active glaciation, and do not depict perennial snow and ice. Moraines were digitized based on WorldView imagery acquired on the following dates: 20141019, 20150822, 20150912, 20150925, 20160821, 20160915 (World View 01 and World View 03 satellites). High resolution imagery was supplemented with oblique aerial photographs flown in 2009 and 2016, historic photographs from the USGS photograph collection, and field notes...
thumbnail
These polygon features represent digitization of the glacier margins for the 37 named glaciers of Glacier National Park (GNP) and the 2 glaciers along the border of GNP derived from aerial images acquired on September 11, 12, 14, 15, 1998. The polygons represent only the main body portion of the glacier as they appeared in the 1998 imagery. Disconnected patches are not included as this dataset represents only the main body features. Polygons were digitized from orthorectified aerial images with initial digitization completed in 2001 by Michelle Manly, University of North Dakota graduate student. This set of polygons represents a thorough review with revisions to the initial dataset based on local knowledge and improved...
thumbnail
These polygon features represent a comprehensive inventory of perennial snow and ice on the landscape in Glacier National Park (GNP) in 2005. This dataset does not include the 2005 extent of the named glaciers in GNP, which have been previously published. Of the perennial snow and ice features delineated here, 1.68 km2 (15.08%) of the total area exhibits characteristics indicative of active glacial ice. The imagery used to delineate perennial snow and ice was taken late season, therefore, all snow and ice present on the landscape is assumed to be perennial. Polygons were digitized based on National Agricultural Imagery Program (NAIP) imagery acquired in 2005, imagery acquired by the National Park Service in 2004...
    map background search result map search result map Glacier margin time series (1966, 1998, 2005, 2015) of the named glaciers of Glacier National Park, MT, USA 1966_Glacier margins derived from USGS 1966 topographic maps for the named glaciers of Glacier National Park, MT and environs 1998_Glacier margins derived from 1998 aerial imagery for the named glaciers of Glacier National Park, MT and environs 2005_Glacier margins derived from 2005 NAIP imagery for the named glaciers of Glacier National Park, MT and environs 2015_Glacier margins derived from 2015 satellite imagery for the named glaciers of Glacier National Park, MT and environs A comprehensive inventory of maximum glacial extent in Glacier National Park during the peak of the Little Ice Age Maximum glacial extent of the named glaciers in Glacier National Park during the peak of the Little Ice Age A comprehensive inventory of perennial snow and ice in Glacier National Park in 2005 Glaciers of Glacier National Park Repeat Photography Collection Glacier margin time series (1966, 1998, 2005, 2015) of the named glaciers of Glacier National Park, MT, USA 2015_Glacier margins derived from 2015 satellite imagery for the named glaciers of Glacier National Park, MT and environs 2005_Glacier margins derived from 2005 NAIP imagery for the named glaciers of Glacier National Park, MT and environs 1998_Glacier margins derived from 1998 aerial imagery for the named glaciers of Glacier National Park, MT and environs 1966_Glacier margins derived from USGS 1966 topographic maps for the named glaciers of Glacier National Park, MT and environs Maximum glacial extent of the named glaciers in Glacier National Park during the peak of the Little Ice Age A comprehensive inventory of maximum glacial extent in Glacier National Park during the peak of the Little Ice Age A comprehensive inventory of perennial snow and ice in Glacier National Park in 2005 Glaciers of Glacier National Park Repeat Photography Collection