{"id":217612,"date":"2019-04-03T23:55:00","date_gmt":"2019-04-04T06:55:00","guid":{"rendered":"https:\/\/www.esri.com\/about\/newsroom\/?post_type=arcnews&p=217612"},"modified":"2021-06-23T11:38:28","modified_gmt":"2021-06-23T18:38:28","slug":"a-revolution-in-remote-sensing-is-under-way","status":"publish","type":"arcnews","link":"https:\/\/www.esri.com\/about\/newsroom\/arcnews\/a-revolution-in-remote-sensing-is-under-way","title":{"rendered":"A Revolution in Remote Sensing Is Under Way"},"author":1432,"featured_media":0,"menu_order":0,"template":"","format":"standard","meta":{"_acf_changed":false,"sync_status":"","episode_type":"","audio_file":"","castos_file_data":"","podmotor_file_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","_links_to":"","_links_to_target":""},"categories":[275822,325382,275982],"tags":[26512,276582,328472,1751,137952],"arcnews_issues":[327822],"class_list":["post-217612","arcnews","type-arcnews","status-publish","format-standard","hentry","category-arcgis-living-atlas-of-the-world","category-remote-sensing","category-vision","tag-climate-change","tag-gps","tag-radio-occultation","tag-satellites","tag-weather","arcnews_issues-spring-2019","arcnews_sections-news"],"acf":{"short_description":"Using radio occultation, nanosatellites can collect extremely accurate atmospheric data. This is about to transform weather forecasting.","pdf":{"host_remotely":false,"file":"","file_url":""},"flexible_content":[{"acf_fc_layout":"content","content":"Remote sensing<\/a>, weather forecasting, and climate science are undergoing a drastic change. Nanosatellites, which cost much less to produce and launch than traditional satellites, can now collect vast amounts of extremely accurate atmospheric data using a technique called radio occultation. This data collection method wields GPS to monitor all sorts of variables between the earth\u2019s surface and the top of the stratosphere\u2014from atmospheric refractivity to moisture, pressure, and temperature.\r\n\r\nThe pioneer behind this science is Dr. Thomas Yunck, a leading expert on GPS and the founder, chairman, and chief technology officer of a startup called GeoOptics."},{"acf_fc_layout":"image","image":217642,"image_position":"right","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"\u201cThis is a huge revolution,\u201d said Yunck, who first looked into using GPS for science in 1979 while working as an engineer at the National Aeronautics and Space Administration\u2019s (NASA) Jet Propulsion Laboratory (JPL). He wrote the first-ever proposal to use GPS signals to measure the earth\u2019s atmosphere from space in 1988, and he has been deeply involved in developing and validating this technology ever since.\r\n\r\n\u201cIt\u2019s disruptive technology that could replace the traditional, old, slow way of collecting modern, high-resolution weather data,\u201d said Lawrie Jordan, Esri\u2019s director of imagery and remote sensing.\r\n

An Ideal Solution to a Lot of Problems<\/h3>\r\nForty years ago, when GPS was brand-new, Yunck looked into how to apply the technology to science.\r\n\r\n\u201cWe were using it to support deep space navigation at JPL, so we were investigating it for that purpose,\u201d Yunck recalled.\r\n\r\nAfter studying GPS for what he believes was about two weeks, he wrote an unassuming report stating that it was promising technology for the future.\r\n\r\n\u201cLittle did I know that one day, it would consume my life,\u201d he said. \u201cAs time went on, we found that GPS was essentially an ideal solution to a lot of problems: navigating spacecraft, determining the locations of points on the ground, determining Earth\u2019s rotation, and much more. All these things could be addressed extremely efficiently with GPS.\u201d\r\n\r\nThroughout the 1980s, he and his colleagues at JPL devised a variety of precise techniques for using GPS to help map the topography of the ocean\u2019s surface and measure tectonic plate motion, which had never been observed before. The applications for GPS grew even further in the 1990s, and Yunck kept devising new ways to use the technology.\r\n\r\n\u201cIt occurred to me that we could use GPS receivers on satellites to observe GPS signals passing through the atmosphere,\u201d he said. \u201cIf we could point antennas on satellites at the horizon, we could watch signals rise and set in the atmosphere, and we could observe the atmosphere itself. This was a rather novel idea for GPS.\u201d\r\n\r\nIt would also turn out to be an entirely different method for measuring the atmosphere, leading to more precise weather forecasting and studies on climate change."},{"acf_fc_layout":"quote","image":217652,"text":"Over the next 10 to 15 years, everything about remote sensing is going to change.","author_name":"Dr. Thomas Yunck","author_profession_organization":"Founder, chairman, and chief technology officer, GeoOptics"},{"acf_fc_layout":"content","content":"NASA funded the early development of this idea, and that started the worldwide discipline for radio occultation. But the technology is highly disruptive, especially now.\r\n

Shrinking Technology and Shifting the Paradigm<\/h3>\r\nWhile Yunck and his colleagues at JPL were developing radio occultation, technological devices were shrinking physically.\r\n\r\n\u201cA cell phone is basically what, 20 years ago, would have been a super computer in a room,\u201d said Yunck. \u201cCell phones, computers, and other consumer-type devices like flat-screen TVs\u2014they\u2019ve all gotten a lot smaller and\/or cheaper.\u201d\r\n\r\nThe same kind of technology that facilitated the compression of consumer devices is now making it possible to build very powerful satellites that weigh 10 kilograms, have a volume of 6 liters, and cost under $1 million to build and a few hundred thousand dollars to launch.\r\n\r\n\u201cIt\u2019s that kind of technology that allows us to miniaturize spacecraft that used to be as big as a bus or a minivan and cost a billion dollars to build,\u201d explained Yunck.\r\n\r\nBut the aerospace industry has been slow to get on board with miniaturization, mostly because government agencies have always had vertical control over space-based data collection\u2014from developing the technology and getting it into orbit to gathering the data and using it.\r\n\r\nIn 2005, Yunck realized that the revolution he was trying so hard to push would have to materialize from the outside. He got a few colleagues on board and formed GeoOptics, a small, private company based in Pasadena, California. One of his earliest supporters was Esri president Jack Dangermond.\r\n\r\n\u201cWe\u2019re overturning a decades-long paradigm of having many government-owned assets in space and shifting to privately owned assets, where small companies are gathering, generating, and delivering data to governments,\u201d said Yunck. \u201cOver the next 10 to 15 years, everything about remote sensing is going to change.\u201d\r\n

Much More Accurate Atmospheric Data<\/h3>\r\nSince its founding, GeoOptics has faced some technological and financial difficulties. But the company now has three operational nanosatellites in orbit and, as of November 2018, is under contract to deliver its science-quality radio occultation data to the National Oceanic and Atmospheric Administration (NOAA) and the US Air Force.\r\n\r\n\u201cIn the last couple years, they have come around to the concept of buying data from a private company because it\u2019s much more cost-effective,\u201d said Yunck.\r\n\r\nWorking with another Southern California-based startup, Tyvak, which builds the nanosatellites, Yunck and his team aim to put a group of satellites into space. They call this the CICERO constellation, which stands for Community Initiative for Continuous Earth Remote Observation."},{"acf_fc_layout":"image","image":217662,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"\u201cI expect that within 10 years, we will have over 100 satellites,\u201d said Yunck. \u201cThat\u2019s going to change the world.\u201d\r\n\r\nUsing radio occultation, these nanosatellites produce better data than typical satellites, according to Yunck. They collect active radio signals passing through the atmosphere to detect the atmosphere\u2019s refractivity. This lets scientists observe atmospheric density, pressure, temperature, and moisture. They can also derive information about high-altitude winds from that data.\r\n\r\nA radio signal collected by a CICERO satellite goes from the earth\u2019s surface to the top of the atmosphere in about 60 seconds and yields 100- to 500-meter vertical resolution. This allows them to measure over 150 levels of the atmosphere\u2014far more than bigger instruments, such as radiometers, which typically measure 6 to 10 levels.\r\n\r\n\u201cIt\u2019s very high-resolution, high-frequency data,\u201d said Jordan. \u201cIt\u2019s much more accurate, which will improve weather forecasts.\u201d\r\n\r\n\u201cThese satellites will have a direct impact on all the regimes of weather forecasting, such as 1- to 15-day weather forecasts, seasonal and longer climate forecasts, and severe storm forecasts,\u201d said Yunck.\r\n\r\nWhen monitoring a hurricane, for example, knowing the atmospheric pressure and moisture levels is critical to determining where the tropical storm is heading and how strong it will be when it makes landfall. More accurate data will allow forecasters to make more specific predictions much farther in advance."},{"acf_fc_layout":"image","image":217672,"image_position":"center","orientation":"horizontal","hyperlink":""},{"acf_fc_layout":"content","content":"It is also more useful for assessing how weather patterns change over time\u2014i.e., climate change. Currently, indicators of rising temperatures around the globe are derived from measurements taken on the earth\u2019s surface. While that\u2019s useful, Yunck says we also need to know what\u2019s happening in the atmosphere. This is much more difficult. But nanosatellites using radio occultation can get an abundance of three-dimensional atmospheric measurements, which Yunck says is critical for studying climate change.\r\n\r\n\u201cOur technique is so precise that our ability to measure temperature in the atmosphere is at least 20 times more accurate than any other known technique in space,\u201d said Yunck. \u201cSo far, it\u2019s the only technique that can observe global warming over a short period of time\u2014months or a few years, as opposed to 5 or 10 or 20 years.\u201d\r\n

A Boon to Esri Users<\/h3>\r\nEventually\u2014perhaps even in 2019\u2014Yunck wants to introduce this three-dimensional atmospheric data to Esri users.\r\n\r\n\u201cThis is going to bring a whole new dimension of data to the user: the vertical dimension of the atmosphere,\u201d said Yunck. \u201cRadio occultation has never been available to this kind of user. It will extend the use of climate-type data from surface-based applications throughout the atmosphere and into space.\u201d\r\n\r\nAlthough the details still need to be worked out, Esri is excited about this prospect as well.\r\n\r\n\u201cWe would like to have this data flow directly into ArcGIS Online,\u201d said Jordan. \u201cIt would be a remarkable addition to ArcGIS Living Atlas of the World.\u201d\r\n\r\nIf GeoOptics can succeed in ramping up its data delivery from once a day, which it\u2019s doing for NOAA now, to every hour or few hours, like Yunck says is possible, that will put more atmospheric data at users\u2019 fingertips faster than ever before."}],"references":null},"yoast_head":"\nA Revolution in Remote Sensing Is Under Way<\/title>\n<meta name=\"description\" content=\"Using radio occultation, nanosatellites can collect extremely accurate atmospheric data. 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