How to create contour maps from geotiff maps

How to create contour maps from geotiff maps how to#

The information used is the distance between points and the elevations of the points. An advantage of this method is once the raw data are collected the map can be created back in the office rather trying to do this in the field. Interpolation is a method to locate contours using the raw data collected in the field. After all the elevations have been determined and the points located on a scaled map, contour lines are drawn based on the desired contour interval using interpolation between points of known elevation. The distance between points on the grid can vary but at a scale where 1 inch equals 10 feet a common distance between points is 50 feet. To use the cross-section method, set a control or reference line at the center of the lot, then lay out and stake a grid the elevation is determined at each stake in the grid relative to a benchmark. The two ways to establish a contour map are the cross-section method and the trace contour method.

A designer can use this very accurate information as they design a system that fits the site. Once the contour map is created all the major components of the site can be located on the to-scale map. There are two ways you can generate a contour map of the lot. There are times when you will be working on a lot that is not part of a development and the only contour map available are the USGS maps that are not at the scale you need.

How to create contour maps from geotiff maps how to#

I have discussed previously how to interpret and use a contour map to assist in a site evaluation to decide where to place an onsite systems. Get Systems/ATUs articles, news and videos right in your inbox!В Sign up now.