DIGITAL ELEVATION MODELS

Digital elevation models are available for the following six Vernon County survey townships: T14NR1W, T14NR2W, T14NR3W, T13NR1W, T13NR2W, T13NR3W. The DEMs were made available by Phil Hahn at the Vernon County Land Conservation Department. The original DTMs were created by Ayres Associates' Photogrammetry Department, Madison, WI. Township DTMs in Intergraph Microstation 5.0 format were converted to DEMs with a 100' sample distance using Intergraph software. The DEM file naming convention is as follows: T#R#DEM, e.g. T14R2DEM.

LATTICES

The DEMs can be converted to lattices within Arc/Info using the command "DEMLATTICE" at the ARC: prompt. Lattices can be used to display topography, derive slope and aspect, and create contour lines among other things. Lattices have been created from the six available DEMs of Vernon County townships (T14NR1W, T14NR2W, T14NR3W, T13NR1W, T13NR2W, T13NR3W). The projection is the Vernon County coordinate system. The lattice naming convention is as follows: T#R#L, e.g. T14R1L.

Note: The lattices can be merged by using the following command in GRID:

GRID: newlattice = merge(lattice,lattice,...,lattice)

CONTOUR LINES

Coverages of contour lines with an accuracy to 10 feet can be derived from the lattices using the command "LATTICECONTOUR" at the ARC: prompt.