■ 데이터 설명 - 국토교통부 국토지리정보원 에서 운영하는 상시관측소에 관측데이터(RINEX)에 대한 GAMIT 정밀좌표 분석 결과 데이터 ■ 정밀분석 S/W 정보 - 프로그램 : GAMIT-GLOBK - 위성궤도력 : 정밀궤도력(Precise Ephemeris, Final orbit), NASA CDDIS, IGS 제공 - 기준좌표계(Terrestrial Reference Frame) : IGb14 - 기준점 (고정점) BJFS : 중국 Beijing Fangshan WUHN : 중국 WUHAN SHAO : 중국 Shanghai IRKT : 러시아 IRKUTSK YSSK : 러시아 YUZHNO DAEJ : 대한민국 대전 AIRA : 일본 KAGOSHIMA BJNM : 중국 Beijing CCJ2 : 일본 OGASAWARA TCMS : 중국 HSINCHU ※ 현재 제공 중인 상시관측소 높이 데이터(타원체고) 중 2021년도 9월 이후 성과에 이상이 발생되어 원인을 파악 중 입니다. 원인 분석 후 다시 결과를 올리도록 하겠습니다.(사용에 불편을 드려 죄송합니다.)

A bare-earth topography Digital Elevation Model (DEM) mosaic for the Lance Rosier Unit of Big Thicket National Preserve in Texas, was produced from remotely sensed, geographically referenced elevation measurements collected on January 15, 21, 22, 25, 26, and 30, 2014 by the U.S. Geological Survey, in cooperation with the National Park Service - Gulf Coast Network. Elevation measurements were collected over the area using the second-generation Experimental Advanced Airborne Research Lidar (EAARL-B), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography. The system uses high-frequency laser beams directed at the Earth's surface through an opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The plane travels over the target area at approximately 55 meters per second at an elevation of approximately 300 meters, resulting in a laser swath of approximately 240 meters with an average point spacing of 0.5-1.6 meters. A peak sampling rate of 15-30 kilohertz results in an extremely dense spatial elevation dataset. More than 100 kilometers of coastline can be surveyed easily within a 3- to 4-hour mission. When resultant elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding land development.