The confluence of the Mississippi, Missouri, and Illinois Rivers are shown in
this view of the St. Louis area from the Shuttle Radar Topography Mission (SRTM). The
Mississippi flows from the upper left of the image and first meets the Illinois,
flowing southward from the top right. It then joins the Missouri, flowing from
the west across the center of the picture. The rivers themselves appear black
here, and one can clearly see the green-colored floodplains in which they are
contained. These floodplains are at particular risk during times of flooding.
The Mississippi forms the state boundary between Illinois (to the right) and
Missouri (to the left), with the city of St. Louis located on the Mississippi
just below the point where it meets the Missouri. This location at the hub of
the major American waterways helped establish St. Louis reputation as the
#147;Gateway to the West.
Two visualization methods were combined to produce this image: shading and
color coding of topographic height. The shade image was derived by computing
topographic slope in the northwest-southeast direction. North-facing slopes
appear bright and south-facing slopes appear dark. Color coding is directly
related to topographic height, with blue and green at the lower elevations,
rising through yellow and brown to white at the highest elevations.
Size: 173.0 by 222.6 kilometers (107.5 by 138.3 miles)
Location: 339 degrees North latitude, 91 degrees West longitude
Orientation: North toward the top
Image Data: shaded and colored SRTM elevation model
Original Data Resolution: SRTM 1 arcsecond (30 meters or 98 feet)
Date Acquired: February 2000 (SRTM)