Explanations of the methods used to define the USEPA’s ecoregions are given in Omernik (1995), Omernik and others (2000), Griffith and others (1994), and Gallant and others (1989, 1995).Ĭolorado contains arid canyons, semiarid shrub- and grass-covered plains, alluvial valleys, lava fields and volcanic plateaus, woodland- and shrubland-covered hills, forested mountains, glaciated peaks, wetlands, and a variety of aquatic habitats. Level IV is a further subdivision of level III ecoregions. At level III, the continental United States contains 104 ecoregions and the conterminous United States has 84 ecoregions (United States Environmental Protection Agency, 2003). Level II divides the continent into 52 regions (Commission for Environmental Cooperation Working Group, 1997). Level I is the coarsest level, dividing North America into 15 ecological regions. A Roman numeral hierarchical scheme has been adopted for different levels of ecological regions. The relative importance of each characteristic varies from one ecological region to another, regardless of the hierarchical level. These phenomena include geology, physiography, vegetation, climate, soils, land use, wildlife, and hydrology. The approach used to compile this map is based on the premise that ecological regions can be identified through the analysis of the spatial patterns and the composition of biotic and abiotic phenomena that affect or reflect differences in ecosystem quality and integrity (Wiken, 1986 Omernik, 1987, 1995). These general purpose regions are critical for structuring and implementing ecosystem management strategies across federal agencies, state agencies, and nongovernment organizations that are responsible for different types of resources within the same geographical areas (Omernik and others, 2000). By recognizing the spatial differences in the capacities and potentials of ecosystems, ecoregions stratify the environment by its probable response to disturbance (Bryce and others, 1999). Level III and IV Ecoregions of Colorado-page size (541 kb)Įcoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources they are designed to serve as a spatial framework for the research, assessment, management, and monitoring of ecosystems and ecosystem components. Level III and IV Ecoregions of Colorado-page size (541 kb).Level III and IV Ecoregions of Colorado-25" X 29" (931 kb).Level IV Ecoregions of Colorado-poster back side 46" X 36" (201 kb).
Colorado GIS Data (shapefiles, metadata and symbology)
#DOWNLOAD USGS MAP FOR A REGION DOWNLOAD#
To make sure you are using the most current ecoregion data, download shapefiles of ecoregions. If you do not find a link to a state that has been completed, maps and GIS data are available on the Ecoregion FTP site and web content will be available shortly. Some Web content for Level IV Ecoregions is under construction.
#DOWNLOAD USGS MAP FOR A REGION PDF#
Additionally, each state section contains links to downloadable maps in PDF format, and files containing GIS datasets (shapefiles, metadata, and symbology data). Select a state for descriptive information about that state's Level III and IV ecoregions. Level III & IV Ecoregions by EPA Region.Level III & IV Ecoregions of the Continental United States.Coordinates-Displays coordinates for the cursor.My Location-Centers the Advanced Viewer on current physical location.Select-Enables interactive selection of features on the map and take the actions on the selected features.Draw-Draws basic graphics and text on the map.Print-Advanced or basic printing of the current map.If unable to find data at the requested point, this tool returns -1000000. Spot Elevation-Returns an elevation in international feet or meters for a specific latitude/longitude (NAD 1983) point from the USGS 3DEP 1/3 arc-second layer.Elevation Profile-Display the elevation profile for a selected feature or a measured line along with a web map.Measurement-Measure the area of a polygon, length of a line, or find the coordinates of a point.Query-Query information from operational layers by executing a predefined query.Share-Share the app via social media, email, or embedded link.
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