The United States Army Corps of Engineers, Kansas City
District published the 1994 hydrographic survey as a series of 182
large-scale maps, each characterizing, on average, between 2-4 miles of
the river. The Kansas City District provided the Columbia
Environmental Research Center with georeferenced Microstation DGN files.
They were processed as follows:
The DGN files were converted to ArcView shapefiles.
The shapefiles were edited to remove all
cartographic features not representing the actual floodplain
The length of vertices was calculated. Line
"entities" with a length less than 25-feet were selected
and removed. They represented symbol fills.
The Multi-part shapefiles were converted to single
part shapefiles (polyline).
The shapefiles were generalized to a minimum vertex
length of 2.5 feet. This reduced the number of vertices by 80 to
The shapefiles were reprojected from Missouri State
Plane to UTM, Zone 15, NAD83, Meters.
The shapefiles were converted to DXF files.
The River Studies Station uses these DXF files in
conjunction with navigation software to plan and execute river habitat
mapping activities. Because file size is inversely related to screen
refresh rates, it is important to keep them as small as possible. This
was accomplished by eliminating cartographic elements, symbol fills and
the number of vertices used to characterize features.
Note: Make sure the ArcView CAD extension is
loaded in order to add the DXF files as a theme to a view.