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C-MAP Help Guide
Overview
The Clean Air Mapping and Analysis Program (CMAP) is a web-based GIS (geographic information system) assessment tool that interfaces with EPA’s Clean Air Markets Division (CAMD) air program database. CMAP offers users an interactive mapping and data download capability that supports integrated assessments of national and regional pollutant emission reduction programs. Through CMAP, users can routinely characterize status and trends in the environment attributable to reductions in emissions over time and space affected under Title IV of the Clean Air Act (Acid Rain Program) and other air programs, and track progress towards meeting environmental goals.
The cornerstone of CMAP is comprehensive atmospheric datasets generated from long-term, atmospheric monitoring networks. In particular, data from the Clean Air Status and Trends Network (CASTNET) and the National Atmospheric Deposition Program (NADP) are used by scientists and policy makers to determine the effectiveness of national emission control programs. Systematically tracking and understanding ambient air and atmospheric deposition measurements are important links in a broader “chain of accountability” that relates the impacts of changing emissions to ecological and human health effects.
CAMD datasets such as electric generating facility locations and emissions, monitored ambient air quality, and monitored atmospheric deposition may be queried, mapped, and downloaded through the CMAP interface. A wide variety of geographic reference data such as hydrological regions and political boundaries may be displayed in conjunction with the air data to provide context.
If you are a new CMAP user, check out the CMAP Map Viewer. By clicking on the various parts of the CMAP screen, you will find descriptions and instructions about CMAP's functionality.
If you are already familiar with CMAP and know which component you need assistance with, click on the appropriate link below:
- The Map Viewer Toolbar (tools for interacting with the map)
- The Layer List and Legend (used to control layer visibility and view the map legend)
- The CMAP Data Selection Menu (dialog for selecting map layers to display)
- The CMAP Query Menu (used to build queries on the underlying CMAP database)
- Downloading CMAP Data (instructions for downloading CMAP Shapefiles and data)
Software Requirements
- Internet Explorer version 5.5 or higher
- Microsoft Excel version 97 or higher