Global River Widths from Landsat (GRWL) Database

Please cite Allen and Pavelsky (2018) “Global Extent of Rivers and Streams” Science if you use this database in your work. 

This repository contains two zip files:

1) The GRWL Mask (raster): GRWL_mask_V01.01.zip 

2) The GRWL Vector Product: GRWL_vector_V01.01.zip

1) Documentation for the Global River Width from Landsat (GRWL) Mask V01.01

This zip file contains 830 GeoTIFF tiles of water masks at mean discharge. The assembly of this database is described in Allen and Pavelsky (2018) “Global Extent of Rivers and Streams” published in Science. The GRWL mask is an intermediate product in the production the GRWL vector product and thus is not explicitly validated. 

Tile coverage: 4 degrees latitude by 6 degrees longitude
File format: GeoTIFF (unsigned byte)
Projection: Geographic WGS84 
Resolution: 30 m

Pixel classifications: 
DN = 255 : River
DN = 180 : Lake/reservoir 
DN = 126 : Tidal rivers/delta 
DN = 86 : Canal
DN = 0 : Land/water not connected to the GRWL river network

2) Documentation for the Global River Width from Landsat (GRWL) Vector Product V01.01

This zip file contains 829 ESRI shapefile polylines of river centerlines. 
Tile coverage: 4 degrees latitude by 6 degrees longitude. 
Projection: Geographic WGS84 
Resolution: 30 m

At each GRWL measurement location, the shapefile contains the following attributes:
1.    utm_east: UTM Easting (UTM Zone is given in tile file name; meters)
2.    utm_north: UTM Northing (UTM Zone is given in tile file name; meters)
3.    width_m: wetted width of river (meters)
4.    nchannels: braiding index (-)
5.    segmentID: unique ID of river segment in each tile
6.    segmentInd: Index of each observation in each segment. Not sorted by upstream or downstream
7.    lakeflag: integer specifying if observation is located on a river (lakeflag=0), lake/reservoir (lakeflag=1), tidal river (lakeflag=2), or canal (lakeflag=3). 
8.    lon: Longitude (decimal degrees)
9.    lat: Latitude (decimal degrees)
10.    elev: Elevation (meters) – sampled from the Hydro1k DEM