{"@type": "dcat:Dataset", "accessLevel": "public", "contactPoint": {"@type": "vcard:Contact", "fn": "Open Data Administrator", "hasEmail": "mailto:no-reply@opendata.maryland.gov"}, "description": "Joint Base Andrews conducts low-level helicopter training operations across areas in southern Maryland and northern Maryland including along the Potomac River.There are three separate low-level flight areas associated with training at NAS Patuxent River, two of which are in Maryland \u2013 East Helicopter Operating Area and West Helicopter Operating Area. Both low-level flight areas cover a broad area of land across Calvert County, Dorchester County, St. Mary\u2019s County, and Wicomico County in which NAS Patuxent River conducts low-level flight training operations with rotary-wing and some fixedwing aircraft.Some military flight training is conducted at altitudes below 10,000 feet above mean sea level, and sometimes even below 200 feet AGL. For example, nap-of-the-earth training exercises include aircraft flying just above ground level or tree line using terrain-following sensors to avoid radar detection. Due to the low altitudes and speeds of the aircraft, these training missions are conducted within designed low-level flight areas to avoid collisions with civilian aircraft. However, the development of tall structures can interfere with and create hazards for aircraft conducting low-level flight training.", "distribution": [{"@type": "dcat:Distribution", "downloadURL": "https://opendata.maryland.gov/api/views/uhss-5usc/rows.csv?accessType=DOWNLOAD", "mediaType": "text/csv"}, {"@type": "dcat:Distribution", "describedBy": "https://opendata.maryland.gov/api/views/uhss-5usc/columns.rdf", "describedByType": "application/rdf+xml", "downloadURL": "https://opendata.maryland.gov/api/views/uhss-5usc/rows.rdf?accessType=DOWNLOAD", "mediaType": "application/rdf+xml"}, {"@type": "dcat:Distribution", "describedBy": "https://opendata.maryland.gov/api/views/uhss-5usc/columns.json", "describedByType": "application/json", "downloadURL": "https://opendata.maryland.gov/api/views/uhss-5usc/rows.json?accessType=DOWNLOAD", "mediaType": "application/json"}, {"@type": "dcat:Distribution", "describedBy": "https://opendata.maryland.gov/api/views/uhss-5usc/columns.xml", "describedByType": "application/xml", "downloadURL": "https://opendata.maryland.gov/api/views/uhss-5usc/rows.xml?accessType=DOWNLOAD", "mediaType": "application/xml"}], "identifier": "https://opendata.maryland.gov/api/views/uhss-5usc", "issued": "2025-07-22", "landingPage": "https://opendata.maryland.gov/d/uhss-5usc", "modified": "2025-10-06", "publisher": {"@type": "org:Organization", "name": "opendata.maryland.gov"}, "title": "Maryland_Helicopter_Operations"}