gis_watershed English utf8 dataset McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact 2023-10-23 ISO 19115-2 Geographic Information - North American Profile Metadata - Data with Biological Extensions ISO 19115-2:2009(E) Shapefiles for glacier, stream channel, and watershed boundaries in the McMurdo Dry Valleys, Antarctica (2023) 2023-10-23 publication Anna Wright University of Colorado Boulder http://www.colorado.edu/ anna.t.wright@colorado.edu pointOfContact documentDigital This data package includes shapefiles for selected glacier, stream watershed, and stream channel boundaries in the McMurdo Dry Valleys region of Antarctica. A combination of satellite imagery and digital elevation models were used to delineate watershed and stream channel outlines, while glaciers were outlined by hand. Watershed boundaries provide an estimate of the overall topographic contributing area for each stream in Fryxell Basin, whereas stream channel boundaries provide a topographic area estimate for stream channel, beyond the wetted margin, for each stream. Name: Renée F. Brown Role: data manager completed McMurdo Dry Valleys LTER Information Manager im@mcmlter.org pointOfContact disturbance theme LTER Core Areas English This is the Taylor Valley, a subjectively approximated contour by San Gil. We use this to denote the geographical extent of studies that encompass the whole Taylor Valley. According to Wiki contributors, the Taylor Valley is the southernmost of the three large Dry Valleys in the Transantarctic Mountains, Victoria Land, located west of McMurdo Sound. The valley extends from Taylor Glacier in the west to McMurdo Sound at Explorers Cove at the northwest head of New Harbour in the east and is about 29 kilometres (18 mi) long. It was once occupied by the receding Taylor Glacier, from which it derives its name. Taylor Valley contains Lake Bonney in the west (inward), and Lake Fryxell in the east (coastward), and Lake Hoare, Lake Chad, Mummy Pond and Parera Pond close together between the two. Further east of Lake Bonney is Pearse Valley. Taylor Valley is separated from Wright Valley in the north by Asgard Range, and from Ferrar Glacier in the south by Kukri Hills. 163.624877929690 161.707763671880 -77.808487073526 -77.519802097166 USGS site 14; kiwi site 3500001; coordinates taken from 1996-97 GPS measurements at center of weir Parent Stream: Onyx River Provenance : GPS96-97.DOC ID: onyx_vnda 161.696624800000 161.696624800000 -77.523430000000 -77.523430000000 USGS site 15; kiwi site 3500002; coordinates taken from 1996-97 GPS measurements at center of weir Parent Stream: Onyx River Provenance : GPS96-97.DOC ID: onyx_lwright 162.653533900000 162.653533900000 -77.444534000000 -77.444534000000 2023-09-07 This work was supported by the US National Science Foundation grants #OPP-1637708 and #OPP-2224760 for Long Term Ecological Research. https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_manifest-20231020_0.csv manifest eng; US McMurdo Dry Valleys LTER manifest Data Source Definition : Manifest table Number of Header Lines : 1 Orientation : Column Quote Character : "Field Delimiter : , false dataset_code Internal dataset code. subfolder_name Name of the subfolder that includes the associated shapefile. shapefile_name Filename of the associated shapefile. Each shapefile consists of four separate files with the following file extensions: .dbf, .prj, .shp, .shx shapefile_description Description of the associated shapefile. DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_manifest-20231020_0.csv https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_shapefiles-20231020.zip shapefiles eng; US McMurdo Dry Valleys LTER shapefiles Data Source Definition : Shapefiles Number of Header Lines : 1 Orientation : Column Field Delimiter : , false DBF https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_shapefiles-20231020.zip dataset A Digital Elevation Model (DEM) (Levy et al., 2014) was used to delineate selected watersheds across the Taylor and Wright Valleys in the McMurdo Dry Valleys region of Antarctica, with most efforts focused on the Lake Fryxell Basin of Taylor Valley. In ArcGIS Pro, the Watershed tool uses the “pour points” (or lowest point in the stream channel before it flows into Lake Fryxell) to assess the total contributing area above it. Each stream watershed was outlined into a polygon and assessed for total watershed area. The ice-free watershed area was created by visually outlining and removing the glacier areas. Using the Flow Accumulation tool, along with the slope and hillshade rasters created from the DEM, individual stream channels were outlined and exported as polygons. Metadata Access Constraints: none Metadata Use Constraints: none annually McMurdo Dry Valleys LTER http://mcmlter.org/ pointOfContact