Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Airspace designated for hazardous military activities, such as live weapons training. All aircraft not associated with these activities are restricted from entry. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of Maryland. Data source: Military Aviation and Installation Assurance Siting Clearinghouse website (https://www.acq.osd.mil/dodsc/about/maps.html) Last updated: 2020. Recommended data update schedule: yearly Contacts sources: websites for the military installation to which each restricted area belongs. Recommended to check for updates when checking for new restricted area data, approximately yearly.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Military Aviation and Installation Assurance Siting Clearinghouse
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Contains boundaries of Department of Defense (DoD) sites: installations, ranges, training areas, etc. in the state of Maryland. These boundaries are intended for planning purposes only and do not represent the legal or land-surveyed boundaries. Sites under 10 acres and valued at less than $10 million are not included as stipulated by DoD standards. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of New Mexico. Data Source: Office of the Assistant Secretary of Defense for Sustainment website (https://www.acq.osd.mil/eie/BSI/BEI_DISDI.html) Last updated: Data available for prior fiscal year (FY). For example, FY 2018 data was available in calendar year 2019. Recommended update schedule: check for new, altered, or closed installations yearly.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN><SPAN>Areas surrounding military runways that must be kept clear of objects that could damage an aircraft. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of Maryland.</SPAN></SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Joint Base Andrews conducts low-level helicopter training operations across areas in southern Maryland and northern Maryland including along the Potomac River.</SPAN></P><P><SPAN>There are three separate low-level flight areas associated with training at NAS Patuxent River, two of which are in Maryland – 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’s County, and Wicomico County in which NAS Patuxent River conducts low-level flight training operations with rotary-wing and some fixedwing aircraft.</SPAN></P><P><SPAN>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.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Joint Base Andrews, NAS Patuxent River, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Denotes the U.S. Navy's supersonic testing area also referred to as the Atlantic Test Track.</SPAN></P><P><SPAN>The Supersonic Test Track is used by various DoD installations to test and evaluate aircraft that travel at the speed of sound, or “supersonic.” This military operational area is located offshore over the Atlantic Ocean to avoid populated areas.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Naval Air Station Patuxent River, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Military testing areas include firing and bombing ranges where the DoD tests weapons systems and equipment, which include releasing ordnance and other projectiles from aircraft, watercraft, as well as from land-based artillery. These areas can be particularly hazardous for development as some weapons systems and ordnance being tested can contain live ammunition and explosives.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Naval Support Facility Dahlgren, US Navy, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Aerial Firing/Weapons Separation Testing Area is within the Atlantic Test Range – Inner Range and over the Chesapeake Bay in which the DoD evaluates discharge characteristics from weapons and other equipment off aircraft. </SPAN></P><P><SPAN>Military testing areas include firing and bombing ranges where the DoD tests weapons systems and equipment, which include releasing ordnance and other projectiles from aircraft, watercraft, as well as from land-based artillery. These areas can be particularly hazardous for development as some weapons systems and ordnance being tested can contain live ammunition and explosives.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Atlantic Warning Area covers over 35,000 square miles across the Atlantic Ocean, including both the air and sea space. This vast area supports a wide variety of DoD training requirements, as well as other research, development, testing, and evaluation, including munitions deployment and flight-testing.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Copyright Text: Naval Air Station Patuxent River, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Naval Research Laboratory areas of radar concerns.</SPAN></P><P><SPAN>Radars locate an object’s position by emitting electromagnetic waves that reflect off objects, such as planes, birds, and mountains, and are returned to the radar. The electromagnetic waves that are returned to the radar provide the information needed to calculate an estimated size, location, speed, and direction of an object.</SPAN></P><P><SPAN>The radar viewshed, or field of view, is the area that is within range of a radar’s electromagnetic waves. The range of the viewshed is influenced by multiple factors, including the radar’s look angle, terrain, weather, as well as natural and manmade objects. Natural and man-made structures within a radar’s field of view can limit the range of the viewshed by blocking electromagnetic waves, which impacts the integrity and usefulness of a radar in identifying and locating aircraft, watercraft, weather, or other objects such as missiles. Additionally, other electromagnetic activity, such as radio waves or microwaves, in the vicinity of a radar transmitter and/or receiver (typically within 8 to 10 miles) can interfere with the electromagnetic waves emitted by the radar. One of the most crucial components within the radar viewshed is the line-of-sight, which is the linear path between the transmitter and receiver (when not the same antenna). An obstruction to this linear path can result in loss communication signals between the transmitter and receiver rendering the radar ineffective. </SPAN></P><P><SPAN /></P><P><SPAN /></P><P><SPAN /></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>NASA's Wallops facility radar area of interest.</SPAN></P><P><SPAN>Radars locate an object’s position by emitting electromagnetic waves that reflect off objects, such as planes, birds, and mountains, and are returned to the radar. The electromagnetic waves that are returned to the radar provide the information needed to calculate an estimated size, location, speed, and direction of an object.</SPAN></P><P><SPAN>The radar viewshed, or field of view, is the area that is within range of a radar’s electromagnetic waves. The range of the viewshed is influenced by multiple factors, including the radar’s look angle, terrain, weather, as well as natural and manmade objects. Natural and man-made structures within a radar’s field of view can limit the range of the viewshed by blocking electromagnetic waves, which impacts the integrity and usefulness of a radar in identifying and locating aircraft, watercraft, weather, or other objects such as missiles. Additionally, other electromagnetic activity, such as radio waves or microwaves, in the vicinity of a radar transmitter and/or receiver (typically within 8 to 10 miles) can interfere with the electromagnetic waves emitted by the radar. </SPAN></P></DIV></DIV></DIV>
Copyright Text: NASA Wallops Flight Facility, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Radar viewshed for the Advanced Dynamic Aircraft Measurement Systems (ADAMS) radar at Naval Air Station Patuxent River.</SPAN></P><P><SPAN>Radars locate an object’s position by emitting electromagnetic waves that reflect off objects, such as planes, birds, and mountains, and are returned to the radar. The electromagnetic waves that are returned to the radar provide the information needed to calculate an estimated size, location, speed, and direction of an object.</SPAN></P><P><SPAN>The radar viewshed, or field of view, is the area that is within range of a radar’s electromagnetic waves. The range of the viewshed is influenced by multiple factors, including the radar’s look angle, terrain, weather, as well as natural and manmade objects. Natural and man-made structures within a radar’s field of view can limit the range of the viewshed by blocking electromagnetic waves, which impacts the integrity and usefulness of a radar in identifying and locating aircraft, watercraft, weather, or other objects such as missiles. Additionally, other electromagnetic activity, such as radio waves or microwaves, in the vicinity of a radar transmitter and/or receiver (typically within 8 to 10 miles) can interfere with the electromagnetic waves emitted by the radar. One of the most crucial components within the radar viewshed is the line-of-sight, which is the linear path between the transmitter and receiver (when not the same antenna). An obstruction to this linear path can result in loss communication signals between the transmitter and receiver rendering the radar ineffective. </SPAN></P></DIV></DIV></DIV>
Copyright Text: Naval Air Station Patuxent River, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Airspace designated for hazardous military activities, such as live weapons training. All aircraft not associated with these activities are restricted from entry. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of Maryland. Data source: Military Aviation and Installation Assurance Siting Clearinghouse website (https://www.acq.osd.mil/dodsc/about/maps.html) Last updated: 2020. Recommended data update schedule: yearly Contacts sources: websites for the military installation to which each restricted area belongs. Recommended to check for updates when checking for new restricted area data, approximately yearly.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Military Aviation and Installation Assurance Siting Clearinghouse
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Aerial corridors in which military aircraft are permitted to fly faster than 250 knots (about 285 mph) and under 10,000 ft. Routes are divided into visual rules (VR) and instrument rules (IR, at night and in poor weather conditions). This layer contains military training routes (MTR) with a floor elevation of up to and including 500 ft. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of Maryland.</SPAN></P><P><SPAN><SPAN>Data source: Military Aviation and Installation Assurance Siting Clearinghouse website (https://www.acq.osd.mil/dodsc/about/maps.html)</SPAN></SPAN></P><P><SPAN><SPAN>Last updated: between 8/15/2019 and 9/11/2019 (Cycle 1909)</SPAN></SPAN></P><P><SPAN><SPAN>Recommended data update schedule: yearly</SPAN></SPAN></P><P><SPAN>Contacts sources: websites for the military installation to which each MTR belongs. Recommended to check for updates when checking for new MTR data, approximately yearly.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Military Aviation and Installation Assurance Siting Clearinghouse, Department of Defense
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Aerial corridors in which military aircraft are permitted to fly faster than 250 knots (about 285 mph) and under 10,000 ft. Routes are divided into visual rules (VR) and instrument rules (IR, at night and in poor weather conditions). This layer contains military training routes (MTR) with a floor elevation of up to and including 500 ft. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of Maryland.</SPAN></P><P><SPAN><SPAN>Data source: Military Aviation and Installation Assurance Siting Clearinghouse website (https://www.acq.osd.mil/dodsc/about/maps.html)</SPAN></SPAN></P><P><SPAN><SPAN>Last updated: between 8/15/2019 and 9/11/2019 (Cycle 1909)</SPAN></SPAN></P><P><SPAN><SPAN>Recommended data update schedule: yearly</SPAN></SPAN></P><P><SPAN>Contacts sources: websites for the military installation to which each MTR belongs. Recommended to check for updates when checking for new MTR data, approximately yearly.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Military Aviation and Installation Assurance Siting Clearinghouse, Department of Defense
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The dataset depicts the authoritative locations of the most commonly known Department of Defense (DoD) sites, installations, ranges, and training areas world-wide. These sites encompass land which is federally owned or otherwise managed. This dataset was created from source data provided by the four Military Service Component headquarters and was compiled by the Defense Installation Spatial Data Infrastructure (DISDI) Program within the Office of the Assistant Secretary of Defense for Sustainment. Only sites reported in the FY 2019 BSR or released in a map supplementing the Foreign Investment Risk Review Modernization Act of 2018 (FIRRMA) Real Estate Regulation (31 CFR Part 802) were considered for inclusion. This list does not necessarily represent a comprehensive collection of all Department of Defense facilities. For inventory purposes, installations are comprised of sites, where a site is defined as a specific geographic location of federally owned or managed land and is assigned to military installation. DoD installations are commonly referred to as a base, camp, post, station, yard, center, homeport facility for any ship, or other activity under the jurisdiction, custody, control of the DoD.</SPAN></P><P><SPAN>While every attempt has been made to provide the best available data quality, this data set is intended for use at mapping scales between 1:50,000 and 1:3,000,000. For this reason, boundaries in this data set may not perfectly align with DoD site boundaries depicted in other federal data sources. Maps produced at a scale of 1:50,000 or smaller which otherwise comply with National Map Accuracy Standards, will remain compliant when this data is incorporated. Boundary data is most suitable for larger scale maps; point locations are better suited for mapping scales between 1:250,000 and 1:3,000,000.</SPAN></P><P><SPAN>If a site is part of a Joint Base (effective/designated on 1 October, 2010) as established under the 2005 Base Realignment and Closure process, it is attributed with the name of the Joint Base. All sites comprising a Joint Base are also attributed to the responsible DoD Component, which is not necessarily the pre-2005 Component responsible for the site.</SPAN></P></DIV></DIV></DIV>
Copyright Text: Department of Defense, Matrix Design Group, 2020.
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Contains boundaries of Department of Defense (DoD) sites: installations, ranges, training areas, etc. in the state of Maryland. These boundaries are intended for planning purposes only and do not represent the legal or land-surveyed boundaries. Sites under 10 acres and valued at less than $10 million are not included as stipulated by DoD standards. This layer is a member of the "Military" feature dataset, which contains layers related to military installations and flight training areas in the state of New Mexico. Data Source: Office of the Assistant Secretary of Defense for Sustainment website (https://www.acq.osd.mil/eie/BSI/BEI_DISDI.html) Last updated: Data available for prior fiscal year (FY). For example, FY 2018 data was available in calendar year 2019. Recommended update schedule: check for new, altered, or closed installations yearly.</SPAN></P></DIV></DIV></DIV>