Contours with 1 foot intervals and related index files. This data can be searched by keyword or browsed by subject and are available in a variety of formats, including KML, WMS, GeoRSS, and Shapefile.

Direct link to download a geodatabase containing elevation contours for the entire state of Colorado at contour intervals of 10, 20, and 40. The most recent contour line was entered on 10/01/2009. Dataset is maintained by the U.S. Geological Survey.

The National Map Downloader allows users to pan over the United States (Alaska and Hawaii included) and download elevation maps and data products. Downloadable items include topographic maps, DEMS, LiDAR data, hydrography, transportation, and woodland tint data.

DescriptionPotential fens within a 500-m buffer of Colorado highways were identified in ArcGIS 10.3/10.4 using true color aerial photography taken by the National Agricultural Imagery Program (NAIP) in 2004, 2009, 2011, 2013, and 2015, as well as color-infrared imagery from 2013 and 2015. High (but variable) resolution World Imagery from Environmental Systems Research Institute (ESRI) was also used. Using all available imagery and data, potential fen polygons were hand-drawn based on the best estimation of fen boundaries. Each potential fen polygon was attributed with a confidence value of 1 (low confidence), 3 (possible fen), or 5 (likely fen). 

In addition to the confidence rating, any justifications of the rating or interesting observations were noted, including iron fens, beaver influence, floating mats, and springs. Once all potential fens were mapped, each polygon was assigned a code for tracking throughout the verification process. The code was a combination of the closest highway segment and a running sequential four-digit number (e.g., 082A-0278).After field verification, additional confidence values of 7 (confirmed fen) and 0 (confirmed non-fen) were added.



Last Update
2018


Update FrequencyAs needed


Data Owner
Division of Transportation Development


Data Contact
Wetland Program Manager



Collection Method




Projection
NAD83 / UTM zone 13N


Coverage Area
Statewide


Temporal




Disclaimer/Limitations
There are no restrictions and legal prerequisites for using the data set. The State of C