Derive, modify and plot the stream network#
The stream network is a subset of the flow network. Often, this subset is defined as having a minimum upstream area. The idea is that if upstream area exceeds a critical value than flow becomes channelized in stream networks.
StreamObject stores stream networks. Here we simply assume that streams initiate at upstream areas greater than 1000 pixels.
[1]:
import topotoolbox as tt3
dem = tt3.load_dem('tibet')
fd = tt3.FlowObject(dem);
s = tt3.StreamObject(fd,threshold=1000,units='pixels')
Plot the stream network#
The stream network can be plotted using the show method on StreamObject. By passing the dem to the overlay parameter, the stream network is displayed on top of the DEM.
[2]:
s.show(overlay=dem)
