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								<gco:CharacterString>The Federal Aviation Administration (FAA) collects Runway data from data originators and maintains this information within the National Airspace System Resource (NASR). Every 28 days (on AIRAC (Aeronautical Information Regulation And Control) Cycles), these data are released in txt and csv format. The Runways dataset is generated using the data from the NASR 28 Day Subscription. A total of three of the CSVs are used: APT_RWY.csv, APT_RWY_END.csv, and APT_BASE.csv. Using a python script, the APT_RWY_END.csv is filtered down to records that meet the criteria to create a runway polygon (such as valid Lat/Long pairs). The table is then joined to APT_RWY.csv on the fields “SITE_NO” and “RWY_ID” to populate the data with general runway information (length of runway, width of runway, etc.). The APT_BASE.csv is subsequently joined to populate the data with airport information (airport name, ownership type code, and facility use code). After all the information has been joined to the data, the runway ends are geolocated using their latitude and longitude coordinates. Using the ArcPy tool “XYToLine” a line segment is then created between runway ends of the same runway to create a linear feature of each runway. The runway lines are then buffered to half the width of the “RWY_WIDTH” field using the ArcPy tool “Buffer”, creating the runways polygon. The Runway Ends Table is not modified in any capacity and is published exactly how it appears in APT_RWY_END.csv.</gco:CharacterString>
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