Mastering Geospatial Development with QGIS 3.x - Third Edition

Calculating the upstream area above Fort Klamath

These two grids cover the entire area of the DEM, but we are only interested in evaluating what the watershed looks like along Sun Creek upstream of Fort Klamath. Many rivers are monitored by USGS gauging stations, which can be used as points of interest to delineate the upstream contributing area. However, more often than not, smaller streams typically aren't monitored, even though they are important for local communities. So, we can create arbitrary outlet points that are defined along the stream network. To focus our analyses on Sun Creek, we will make use of the Gauge shapefile and use as our outlet what is often called a pour point. We will use the Upslope Area tool to identify the cells ...