Question: How far is the Radar Operations Center (ROC) from downtown Oklahoma City? 

full_context: Document 1: Radar: Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the object(s). Radio waves (pulsed or continuous) from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed.
Document 2: Stillwater, Oklahoma: Stillwater is a city in north east Oklahoma at the intersection of US-177 and State Highway 51. It is the county seat of Payne County, Oklahoma, United States. As of 2012, the city population was estimated to be 46,560, making it the tenth largest city in Oklahoma. Stillwater is the principal city of the Stillwater Micropolitan Statistical Area which had a population of 78,399 according to the 2012 census estimate. Stillwater was part of the first Oklahoma Land Run held April 22, 1889, when the Unassigned Lands were opened for settlement and became the core of the new Oklahoma Territory. The city charter was adopted on August 24 later that year. Stillwater is home to the main campus of Oklahoma State University, as well as a branch of Northern Oklahoma College, Meridian Technology Center, and the Oklahoma Department of Career and Technology Education.
Document 3: Downtown Oklahoma City: Downtown Oklahoma City is located at the geographic center of the Oklahoma City metropolitan area and contains the principal, central business district of the region. The CBD has over 51,000 workers and over 12000000 sqft of leasable office space to-date. Downtown Oklahoma City is the legal, financial, economic, nightlife, and entertainment center of the region.
Document 4: El Reno, Oklahoma: El Reno is a city in and county seat of Canadian County, Oklahoma, United States. As of the 2010 census, the city population was 16,729. The city was begun shortly after the 1889 land rush and named for the nearby Fort Reno. It is located in the central part of the state, approximately 25 mi west of downtown Oklahoma City, and is part of the Oklahoma City Metropolitan Statistical Area.
Document 5: Cleveland: Cleveland ( ) is a city in the U.S. state of Ohio and the county seat of Cuyahoga County, the state's second most populous county. The city proper has a population of 388,072, making Cleveland the 51st largest city in the United States, and the second-largest city in Ohio after Columbus. Greater Cleveland ranked as the 32nd largest metropolitan area in the United States, with 2,055,612 people in 2016. The city anchors the Cleveland–Akron–Canton Combined Statistical Area, which had a population of 3,515,646 in 2010 and ranks 15th in the United States.
Document 6: Payload Operations and Integration Center: Also known as Huntsville Operations Support Center (HOSC) or Payload Operations Center, it is a National Aeronautics and Space Administration (NASA) facility that works in conjunction with the International Space Station and Space Shuttle Control Centers in Houston, Texas. The Payload Operations Center at the Marshall Space Flight Center in Huntsville, Alabama, is the headquarters for International Space Station science operations. This Control Center links Earth-bound researchers and developers from around the world with their experiments and astronauts aboard the International Space Station.
Document 7: Ada, Oklahoma: Ada is a city in and the county seat of Pontotoc County, Oklahoma, United States. The population was 16,810 at the 2010 census, an increase of 7.1 percent from 15,691 at the 2000 census. The city was named for Ada Reed, the daughter of an early settler, and was incorporated in 1901. Ada is home to East Central University, and is the headquarters of the Chickasaw Nation.
Document 8: Radar Operations Center: The Radar Operations Center (ROC) is a National Weather Service (NWS) unit that coordinates the development, maintenance, and training for the NEXRAD weather radar network. It is located at the National Weather Center (NWC) in Norman, Oklahoma and run by the National Oceanic and Atmospheric Administration (NOAA) in the Department of Commerce with partners at the Department of Defense and the Department of Transportation.
Document 9: Norman, Oklahoma: Norman is a city in the U.S. state of Oklahoma 20 mi south of downtown Oklahoma City in its metropolitan area. The population was 110,925 at the 2010 census. Norman's estimated population of 120,284 in 2015 makes it the third-largest city in Oklahoma, and the city serves as the county seat of Cleveland County.
Document 10: University of Oklahoma: The University of Oklahoma (OU) is a coeducational public research university in Norman, Oklahoma. Founded in 1890, it had existed in Oklahoma Territory near Indian Territory for 17 years before the two became the state of Oklahoma. In Fall 2016 the university had 31,250 students enrolled, most at its main campus in Norman. Employing nearly 3,000 faculty members, the school offers 152 baccalaureate programs, 160 master's programs, 75 doctorate programs, and 20 majors at the first professional level. David Lyle Boren, a former U.S. Senator and Oklahoma Governor, has served as the university's president since 1994.
Document 11: Edmond, Oklahoma: Edmond is a city in Oklahoma County, Oklahoma, United States, and a part of the Oklahoma City metropolitan area in the central part of the state. As of the 2010 census, the population was 81,405, making it the sixth largest city in the state of Oklahoma.
Document 12: National Remote Sensing Centre: National Remote Sensing Centre (Hindi: राष्ट्रीय सुदूर संवेदन केन्द्र), or NRSC, located at Hyderabad is one of the centres of the Indian Space Research Organisation (ISRO), striving to realise the Indian Space Vision, as a key player in Earth Observation Programme and Disaster Management Support programme. NRSC is responsible for acquisition, processing, supply of aerial and satellite remote sensing data and continuously exploring the practical uses of remote sensing technology for multilevel (global to local) applications. It provides the necessary trained manpower through capacity building in remote sensing applications.
Document 13: National Hurricane Center: The National Hurricane Center (NHC) is the division of the United States' National Weather Service responsible for tracking and predicting weather systems within the tropics between the Prime Meridian and the 140th meridian west poleward to the 30th parallel north in the northeast Pacific Ocean and the 31st parallel north in the northern Atlantic Ocean. The agency, which is co-located with the Miami branch of the National Weather Service, is situated on the campus of Florida International University in University Park, Florida.
Document 14: National Tsunami Warning Center: The National Tsunami Warning Center (NTWC) is one of two tsunami warning centers that are operated by the National Oceanic and Atmospheric Administration (NOAA) in the United States. It was called the West Coast and Alaska Tsunami Warning Center (WC/ATWC) until October 1, 2013. The name was changed to reflect its geographical zone of responsibility. Headquartered in Palmer, Alaska, the NTWC is part of an international tsunami warning system (TWS) program and serves as the operational center for TWS of all coastal regions of Canada and the United States, except Hawaii, the Caribbean, and the Gulf of Mexico. The other tsunami warning center is the Pacific Tsunami Warning Center (PTWC) in Ford Island, Hawaii, serving participating members and other nations in the Pacific Ocean area of responsibility.
Document 15: WXK85: WXK85 (sometimes referred to as Oklahoma City All Hazards) is the NOAA weather radio station serving the Oklahoma City metro area, it is programmed by the Norman office of the National Weather Service. Counties served by WKX85 include: Canadian, Cleveland, Grady, Kingfisher, Lincoln, Logan, McClain, Oklahoma, Payne, & Pottawatomie.
ground_truth: 20 mi