DOI: 10.5281/zenodo.4421857
title: Supraglacial features of debris covered glaciers in the Himalaya from Landsat-8 spectral umixing and Pleiades

description: This dataset contains the spectral unmixing output files for the debris covered glacier surfaces based on Landsat-8 OLI imagery and Pleiades imagery of 2015. Files are provided for two domains, the Khumbu reference region of Nepal and the greater Himalaya region (76.3 to 92.6° W and 26.3 to 34.2° N), which covers covering most area from Himachal/Jammu and Kashmir border to Bhutan Himalaya. 



	
Landsat surface reflectance : Himalaya_L8_6S_surface_reflectance_scenes_2015 .zip
	

		
Contains surface reflectance images of Landsat-8 OLI scenes mostly from 2015 (two images are from 2014 and 2016 due to clouds in 2015) 
		
Collection 1 Level 1 (L1TP)
		
Atmospherically and topographically corrected using the ARCSI routine, supplied in .kea format. These can be converted to GeoTifs using the GDAL command.
		
Naming structure:         LS8_yyyymmdd_latYYlongXXXX_rRRpPPP_vmsk_topshad_rad_srefdem_stdsref.kea
		
Projection is UTM (zones depending on the image), from the original Landsat L1TP files
		
The file naming convention, which is a standard output from ARCSI routine, include the image date ("yyyy" = year, mm = "month", "dd" = day), latitude ("YY") and longitude ("XXXX") of the image center, path/row ("PPP" = path, "RRR" = row), and the output products generated by ARCSI ("rad" = radiation, "topshad" = topographic shadows, "srefdem" indicates the use of elevation data, "stdsref" = standardized surface reflectance)
	
	
	
Fractional maps for the Khumbu: LS8_20150930_r41p140_frac_files. zip 
	

		
Raster format (GeoTiffs) 
		
Non-normalized fractional water, light and dark debris and vegetation maps for the Khumbu reference image (Sept 30, 2015, path 140 row 40)
		
Output from the linear mixing model routine used to produce binary maps of surfaces with values ranging from 0 to 1 (0% to 100% pixel coverage)
	
	
	
Binary surface maps for the Himalaya: Himalaya_L8_raw_binary_surface_maps.zip 
	

		
Vector format (ArcGIS shapefiles)
		
Raw, unprocessed binary maps of ponds, vegetation debris, ice and clouds over the debris covered glacier tongues in the Himalaya around the year 2015 (binary files) 
		
Derived from tresholding the fractional maps using a variable threshold (see publication)
		
Maps in this pre-release version have not been manually corrected for misclassified areas due to confusion of classes, and the ice and cloud classes are not highly accurate
		
These are not the final coverages of these surfaces over the domain and should not be used as such
		
The supraglacial pond maps will undergo manual corrections and the datasets will be updated on this page
	
	
	
Dataset for analysis, glacier-by-glacier: Himalaya_SDC_LS_for_analysis_gt1km2_with_frac_and_debris_attributes.txt
	

		
original data from the SupraGlacial Debris Cover dataset (Sherler et al 2018)
		
updated with the preliminary fractional cover of each surface (in %) on a glacier-by-glacier basis
		
contains only debris covered tongues >1 km2 
		
debris covered attributes were calculated from the ALOS Global Digital Surface Model (AW3D30 DEM) for each debris covered tongue
		

			
DC_area_km2 = recalculated debris covered area
			
DCmin = minimum debris cover elevation (meters)
			
DCmax = maximum debris cover elevation (meters)
			
DCrange = altitudinal range (meters)
			
DCmed = median elevation (meters)
			
SLmean = mean slope (degrees)
			
SLrange = slope range (degrees)
			
SLmin = min slope (degrees)
			
SLmax = max slope (degrees)
description: Pre-release version of the datasets. The supraglacial pond maps will be updated to subsequent versions following manual verifications. This is not the final release.