Dataset Open Access

Global River Widths from Landsat (GRWL) Database

Allen, George H.; Pavelsky, Tamlin M.

If you use the GRWL Database in your work, please cite: Allen and Pavelsky (2018) Global Extent of Rivers and

Streams. Sciencehttps://doi.org/10.1126/science.aat0636

 

Check out the GRWL Database website: http://gaia.geosci.unc.edu/GRWL/

 

This long-term repository contains three files:

1) Simplified GRWL Vector Product: GRWL_summaryStats_V01.01.zip

2) GRWL Mask (raster): GRWL_mask_V01.01.zip 

3) GRWL Vector Product: GRWL_vector_V01.01.zip

 

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

This zip file contains a single ESRI shapefile polyline of river centerlines. 
Projection: Geographic WGS84 

This file is a simplified version of the raw GRWL vector product (see #3 below). This product is a smaller and more wieldy compared to the raw GRWL vector dataset and most users of GRWL will prefer to use this simplified version. This simplified vector product reduces the number of feature vertices and attributes by simplifying the polyline geometry and by calculating summary statistics along each polyline segment. Polyline segments are roughly the line segments between each tributary junction.  

For each polyline segment, the shapefile contains the following attributes:
1.    width_min: the minimum of river width measurements along the segment at mean discharge (meters)
2.    width_med: the median of river width measurements along the segment at mean discharge (meters)
3.    width_mean: the mean of river width measurements along the segment at mean discharge (meters)
4.    width_max: the maximum of river width measurements along the segment at mean discharge (meters)
5.    width_sd: the standard deviation of river width measurements along the segment at mean discharge (meters)
6.    lakeflag: integer specifying if segment is located on a river (lakeflag=0), lake/reservoir (lakeflag=1), tidal river (lakeflag=2), or canal (lakeflag=3). 
8.    nSegPx: number of pixels within the segment (N pixels)
9.    Shape_Leng: length of the segment (kilometers)

 

2) 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

 

3) 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

Files (3.5 GB)
Name Size
GRWL_mask_V01.01.zip
md5:4bd15bcd9cdcce7b620cd02f776749fa
393.8 MB Download
GRWL_summaryStats_V01.01.zip
md5:c37021e144fbff19ae3fc4e701d85d38
43.2 MB Download
GRWL_vector_V01.01.zip
md5:40171f15c0fccd470db32446dda0480e
3.1 GB Download
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