Anna T. Wright 2023-10-23 tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/034d22e0a633bfc156e1c9723049f087 https://mcm.lternet.edu/content/shapefiles-glacier-stream-channel-and-watershed-boundaries-mcmurdo-dry-valleys-antarctica 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. This work was supported by the US National Science Foundation grants #OPP-1637708 and #OPP-2224760 for Long Term Ecological Research. 2023-09-07 ground condition As needed 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 -77.519802097166 -77.808487073526 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 101m 101m meter 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 273m 273m meter LTER Core Areas disturbance None <cntperp> <cntper>McMurdo Dry Valleys LTER Information Manager</cntper> </cntperp> <cntemail>im@mcmlter.org</cntemail> Name: Renée F. Brown Role: data manager Not Applicable Not Applicable Field and/or Lab Methods 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. 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. unknown manifest Manifest table Dataset Code Internal dataset code. The data provider Internal dataset code. Subfolder Name Name of the subfolder that includes the associated shapefile. The data provider 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 The data provider 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. The data provider Description of the associated shapefile. McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 1 column , https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_manifest-20231020_0.csv None shapefiles Shapefiles McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 1 column , https://mcm.lternet.edu/sites/default/files/data/mcmlter-gis-watershed_shapefiles-20231020.zip None 2023-10-23 2023-10-23 McMurdo Dry Valleys LTER http://mcmlter.org/ Biological Data Profile of the Content Standards for Digital Geospatial Metadata devised by the Federal Geographic Data Committee. Drupal Ecological information Management Systems, version D7, Biological Data Profile module