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Global River Width from Landsat (GRWL)

The Global River Width from Landsat (GRWL) layers are the major output from the GRWL paper and is extremely large with over 64 million features after joining all the subparts and this is a combination from the subpart files provided by the author. You can read the paper here

The repository consists of 5 total files with each files having subparts

1) Simplified GRWL Vector Product: grwl_SummaryStats_v01_01

The shapefile contains the following attributes:

Index Attribute Description
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) GRWL Mask (raster): water_mask_v01_01

The file contains the following values:

DN Value Classification
DN = 256 No Data
DN = 255 River
DN = 180 Lake/reservoir
DN = 126 Tidal rivers/delta
DN = 86 Canal

3) GRWL Vector Product: water_vector_v01_01

The shapefile contains the following attributes:

Index Attribute Description
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) [note: width_m == 1 indicates NA (no width data along the centerline) ]
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

and

4) Location map of the individual GRWL tiles: grwl_tiles

5) River and stream surface area totals by drainage basin (Fig. 4 in Allen & Pavelsky, 2018): rssa_basins

GRWL vector product has a feature Count: 64,572,998 features.

grwl_layers

Currently included layers are

Earth Engine Snippet:

var grwl_summary = ee.FeatureCollection("projects/sat-io/open-datasets/GRWL/grwl_SummaryStats_v01_01");
var water_mask = ee.ImageCollection("projects/sat-io/open-datasets/GRWL/water_mask_v01_01");
var grwl_water_vector = ee.FeatureCollection("projects/sat-io/open-datasets/GRWL/water_vector_v01_01");
var grwl_tiles = ee.FeatureCollection("projects/sat-io/open-datasets/GRWL/grwl_tiles");
var grwl_rssa_basins = ee.FeatureCollection("projects/sat-io/open-datasets/GRWL/rssa_basins");

Sample Code: https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:hydrology/GLOBAL-RIVER-WIDTH-LANDSAT

Resolution: approx 30m

Cite the dataset using

Allen, George H., & Pavelsky, Tamlin M. (2018). Global River Widths from Landsat (GRWL) Database (Version V01.01) [Data set]. Zenodo. http://doi.org/10.5281/zenodo.1297434

Cite the paper using

Allen, George H., and Tamlin M. Pavelsky. "Global extent of rivers and streams."
Science 361, no. 6402 (2018): 585-588.

License

Shared License: This work is licensed under a Creative Commons Attribution 4.0 International License. You are free to copy and redistribute the material in any medium or format, and to transform and build upon the material for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made.

Curated by: Samapriya Roy

Keywords: :"GRWL, Fluvial Geomorphology, Hydrology, Rivers, River Width, Landsat, MNDWI"

Last updated: 2021-04-17