gov.noaa.nodc:ACUNE-EpisodicMonitoring eng utf8 series NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NOAA Contact Information Information for contacts at NCEI. information custodian 2026-02-05T20:58:33Z ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA RESTORE Science Program: A Web-based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida: Episodic Water Level Monitoring from 2018-06-10 to 2020-01-10 2022-01-13 publication 2022-07-19 revision 2021-12-18 creation International DOI Foundation (IDF) 10.25921/src6-qm37 NOAA National Centers for Environmental Information gov.noaa.nodc:ACUNE-EpisodicMonitoring NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information publisher NOAA National Centers for Coastal Ocean Science (NCCOS) https://coastalscience.noaa.gov/ HTTPS NOAA National Centers for Coastal Ocean Science (NCCOS) website Institution web page information resourceProvider Peter Sheng University of Florida (UF) pete@coastal.ufl.edu http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information principalInvestigator Christine Angelini University of Florida (UF) christine.angelini@essie.ufl.edu http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information principalInvestigator Justin R. Davis University of Florida (UF) justin.r.davis@essie.ufl.edu http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information principalInvestigator Justin R. Davis University of Florida (UF) justin.r.davis@essie.ufl.edu http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information pointOfContact Frank Parker NOAA RESTORE Science Program frank.parker@noaa.gov https://restoreactscienceprogram.noaa.gov/ HTTPS NOAA RESTORE Science Program website Institution web page information pointOfContact NOAA National Centers for Coastal Ocean Science (NCCOS) NCCOS Data Manager nccos.data@noaa.gov https://coastalscience.noaa.gov/ HTTPS NOAA National Centers for Coastal Ocean Science (NCCOS) website Institution web page information pointOfContact Todd Van Natta University of Florida (UF) http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information collaborator Michael Barry The Institute for Regional Conservation collaborator Britta Jessen Florida Department of Environmental Protection (FL DEP); Rookery Bay National Estuarine Research Reserve (RBNERR) collaborator Keith Laakkonon Florida Department of Environmental Protection (FL DEP); Rookery Bay National Estuarine Research Reserve (RBNERR) collaborator Davis, Justin R. University of Florida; College of Engineering; Engineering School of Sustainable Infrastructure and Environment (ESSIE); Coastal Engineering http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author Van Natta, Todd University of Florida; College of Engineering; Engineering School of Sustainable Infrastructure and Environment (ESSIE); Coastal Ecosystems Dynamics (CESD) http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author NOAA National Centers for Coastal Ocean Science (NCCOS) https://coastalscience.noaa.gov/ HTTPS NOAA National Centers for Coastal Ocean Science (NCCOS) website Institution web page information contributor tableDigital This collection includes in situ observations of water level collected at a high temporal resolution. Observations were collected at 28 sites along the Southwest Coast of Florida from Naples to the Ten Thousand Islands National Wildlife Preserve from 2018-06-10 to 2020-01-10. Included in this collection are: 4 sites in Clam Bay; 8 sites in Goodland; 6 sites in Henderson Creek and 2 sites in Rookery Bay; and 8 sites in the Ten Thousand Islands. Sensors were surveyed by RTK GPS and were vertically positioned at locations estimated to be slightly above local Mean High High Water targeting the collection of data during higher-than-normal water level, episodic events only (e.g., astronomically higher tides, tropical storms, etc.). Although the sensors were deployed during the 2018 and 2019 Atlantic Hurricane season, no tropical storm events were recorded. However, several small astronomically high tide events were observed. The primary variable being observed was water pressure when the sensors were immersed. Southwest Florida contains the largest area of tidally influenced public lands in the Gulf of Mexico and the fastest growing urban landscape in Florida. Both the human and natural components of the ecosystem are under increasing risk due to the threats of a growing human population, sea level rise, and tropical cyclones. The project “A Web-based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida” created inundation, salinity distribution, habitat distribution maps, beach and barrier islands vulnerability, and economic impacts maps for various climate and sea level rise scenarios and integrated the maps into a web-based interactive decision-support tool that enables users to identify areas of high vulnerability. The intent of this dataset was to provide water level data for use in the verification and validation of the tide, surge, and wave modeling components of ACUNE through observations collected during episodic, higher-than-normal water level events (e.g., astronomically higher tides, tropical storms, etc.). Working with local governments, a decision-support tool was developed to aid resource managers with preservation and restoration of mangrove, marsh, and beach habitats and mitigation of future salt-water intrusion in estuaries and their associated habitats. This was accomplished in two steps. First, a suite of coupled state-of-the-art models was used to create inundation, salinity distribution, habitat distribution, beach and barrier islands vulnerability, and economic impact maps for current and future climate and for various sea level rise scenarios. The maps were then integrated into a web-based interactive decision-support tool that enables users to identify areas of high vulnerability. To ensure the tools use, end-users were trained on how to use the tool. The tool allows local governments to make strategic decisions on coastal planning, zoning, land acquisition, and restoration for coastal resiliency. The data in this accession were funded by the NOAA RESTORE Science Program under award NA17NOS4510094 to the University of Florida. Funding Agency: NOAA RESTORE Science Program Funding Agency: NOAA National Centers for Coastal Ocean Science Partner: Ten Thousand Island National Wildlife Refuge completed historicalArchive NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact HTTPS NCEI Contact Information Information for contacts at NCEI. information pointOfContact asNeeded https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:ACUNE-EpisodicMonitoring Preview graphic PNG 0244397 0244860 0246055 0246938 NCEI ACCESSION NUMBER 2021-12-09 publication BAROMETRIC PRESSURE HYDROSTATIC PRESSURE LATITUDE LONGITUDE WATER LEVEL theme NODC DATA TYPES THESAURUS GPS pressure sensor water level recorder instrument NODC INSTRUMENT TYPES THESAURUS in situ physical theme NODC OBSERVATION TYPES THESAURUS NOAA National Centers for Coastal Ocean Science dataCentre NODC COLLECTING INSTITUTION NAMES THESAURUS NOAA National Centers for Coastal Ocean Science dataCentre NODC SUBMITTING INSTITUTION NAMES THESAURUS Coastal Waters of Florida Coastal Waters of Gulf of Mexico Gulf of Mexico North Atlantic Ocean place NODC SEA AREA NAMES THESAURUS oceanography theme WMO_CategoryCode 2012-09-15 publication DOC/NOAA/NOS/NCCOS > National Centers for Coastal Ocean Science, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian NOAA RESTORE Science Program (NA17NOS4510094) RESTORE Project: A Web-Based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida project NCCOS Project Names RESTORE Project, A Web-Based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida project Provider Project Names EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC PRESSURE EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE theme Global Change Master Directory (GCMD) Science Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Field Observation theme NCCOS Research Data Types Beach Mangrove Marsh Sea Level Pressure (SLP) Water Level Waves water level sensor theme Provider Keywords Beach Mangrove Marsh Sea Level Pressure (SLP) Water Level Waves theme Provider Scientific Terms GPS RECEIVERS > GPS RECEIVERS PRESSURE SENSORS > PRESSURE SENSORS WL/CR > WATER LEVEL/CLIMATE RECORDERS instrument Global Change Master Directory (GCMD) Instrument Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian RTK GPS Water level sensor instrument Provider Instruments OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF MEXICO place Global Change Master Directory (GCMD) Location Keywords 2026 revision 23 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) Greenbelt MD https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords HTTPS GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 21. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian U.S. States and Territories > Florida Waterbodies > Gulf of Mexico place NCCOS Regions of Study Clam Bay, FL Goodland, FL Marco Island, FL Naples, FL Rookery Bay National Estuarine Research Reserve Ten Thousand Islands National Wildlife Refuge place Provider Place Names 04UK17 EBHHTP J18XXN K6UG1Y Send2NCEI Submission Package ID accessLevel: Public otherRestrictions Cite as: Davis, Justin R.; Van Natta, Todd (2022). NOAA RESTORE Science Program: A Web-based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida: Episodic Water Level Monitoring from 2018-06-10 to 2020-01-10. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/src6-qm37. Accessed [date]. Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. Integrated Surface Dataset (Global), Marco Island, FL US, Station 72104199999, Sea Level Pressure (SLP), 2018-01-01 to 2020-10-26 2020 publication Station 72104199999 https://www.ncei.noaa.gov/access/search/data-search/global-hourly?stations=72104199999&startDate=2018-01-01T00:00:00&endDate=2020-10-26T23:59:59 HTTPS Marco Island, FL US, Station 72104199999 Data Source download NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference Integrated Surface Dataset (Global), Naples Municipal Airport, FL US, Station 72203812897, Sea Level Pressure (SLP), 2018-01-01 to 2020-10-27 2020 publication Station 72203812897 https://www.ncei.noaa.gov/access/search/data-search/global-hourly?stations=72203812897&startDate=2018-01-01T00:00:00&endDate=2020-10-27T23:59:59 HTTPS Naples Municipal Airport, FL US, Station 72203812897 Data Source download NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference Integrated Surface Dataset (Global), Rookery Bay Reserve, FL US, Station 99800899999, Sea Level Pressure (SLP), 2018-01-01 to 2020-10-26 2020 publication Station 99800899999 https://www.ncei.noaa.gov/access/search/data-search/global-hourly?stations=99800899999&startDate=2018-01-01T00:00:00&endDate=2020-10-26T23:59:59 HTTPS Rookery Bay Reserve, FL US, Station 99800899999 Data Source download NOAA National Centers for Environmental Information (NCEI) publisher documentDigital crossReference National Centers for Coastal Ocean Science, 2020: RESTORE Sponsored Research Project: A Web-Based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida, https://www.fisheries.noaa.gov/inport/item/58981. 2020 publication gov.noaa.nmfs.inport:58981 https://www.fisheries.noaa.gov/inport/item/58981 HTTPS https://www.fisheries.noaa.gov/inport/item/58981 Inport Metadata: 58981 information NOAA National Centers for Coastal Ocean Science (NCCOS) https://coastalscience.noaa.gov/ HTTPS NOAA National Centers for Coastal Ocean Science (NCCOS) website Institution web page information publisher tableDigital crossReference RESTORE Project: A Web-Based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida 2020 publication https://restoreactscienceprogram.noaa.gov/projects/local-coastal-tool HTTPS https://restoreactscienceprogram.noaa.gov/projects/local-coastal-tool FL Local Coastal Tool information documentDigital crossReference Sharp, Sean; Norby, Patrick; Angelini, Christine (2020). NOAA RESTORE Science Program: A web-based interactive decision-support tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in southwest Florida: measured and laser-scanned vegetation structure from 2017-11-27 to 2017-12-02 (NCEI Accession 0222471). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/q9mn-d869. 2020-12-01 publication International DOI Foundation (IDF) https://doi.org/10.25921/q9mn-d869 NOAA National Centers for Environmental Information gov.noaa.nodc:0222471 https://doi.org/10.25921/q9mn-d869 HTTPS https://doi.org/10.25921/q9mn-d869 Data Source information Sharp, Sean University of Michigan http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author Norby, Patrick University of Florida http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author Angelini, Christine University of Florida http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference collection Sheng, Y. Peter; Paramygin, Vladimir A.; Davis, Justin R. (2022). NOAA RESTORE Science Program: A Web-based Interactive Decision-Support Tool for Adaptation of Coastal Urban and Natural Ecosystems (ACUNE) in Southwest Florida: Flood Maps for current conditions, 2030, 2060, and 2100 under different sea level rise scenarios (NCEI Accession 0248802). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/kak7-1a89. 2022-03-21 publication International DOI Foundation (IDF) https://doi.org/10.25921/kak7-1a89 NOAA National Centers for Environmental Information gov.noaa.nodc:0248802 https://doi.org/10.25921/kak7-1a89 HTTPS https://doi.org/10.25921/kak7-1a89 Related data information Sheng, Y. Peter University of Florida; College of Engineering; Engineering School of Sustainable Infrastructure and Environment (ESSIE); Coastal Engineering http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author Paramygin, Vladimir A. University of Florida; College of Engineering; Engineering School of Sustainable Infrastructure and Environment (ESSIE); Coastal Ecosystems Dynamics (CESD) http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author Davis, Justin R. University of Florida; College of Engineering; Engineering School of Sustainable Infrastructure and Environment (ESSIE); Coastal Engineering http://www.ufl.edu/ HTTP University of Florida (UF) website Institution web page information author NOAA National Centers for Environmental Information (NCEI) publisher tableDigital crossReference eng; USA utf8 environment oceans climatologyMeteorologyAtmosphere -81.81687 -81.528 25.855 26.21893 2018-06-10 2020-01-10 Methods: To capture the episodic higher-than-normal water level events necessary for model verification and validation, 28 sensors were designed and built from scratch and then deployed/recovered twice. The sensors were deployed in four locations in Southwest Florida: Clam Bay (4), Goodland (8), Henderson Creek / Rookery Bay (8), and in the Ten Thousand Islands. These sensors were designed to deployed vertically out of the water with a triggered to enable them only when an event occurred. This ensured maximum battery life (without the need of a solar panel) and minimal biologic growth both of which were highly useful as many of the deployment locations were remote and teeming with wildlife. Once immersed, the sensors recorded the absolute pressure of the water column above the sensor (which is ultimately converted to water level). The sensors were encased in Schedule-40 PVC which incorporated a PVC union to enable them to be opened while remaining waterproof in the field. The pressure sensors were calibrated in a laboratory with the distance from the pressure sensor port to the top of the union collar determined. Immediately prior to a deployment, the internal highly accurate, temperature compensated RTC (~2 s/yr) was set and the sensor sealed. The sensors were deployed by affixing them to strongly rooted, mature mangroves or trees to ensure they wouldn’t move even during extreme storm events. Pictures of the mounted sensors were taken and the sensors positions were surveyed to the top of the union collar with an RTK GPS system. This enabled to vertical position of the derived water level to be referenced to NAVD88. Sensors were configured to record at 128 hz which enables the resolution of waves, tides and surge. Locations for the sensors were determined during an exploratory visit to the region in mid-2018. Site spatial locations were chosen in a manner to attempt to provide both alongshore and cross-shore tracks. Vertical locations were chosen by estimating the MHHW lines and chose locations 10-20cm above that. For the first deployment, the sensors were deployed at the beginning of the 2018 Atlantic Basin hurricane season and then recovered the following May. For the second deployment, the sensors were deployed several months later in the 2019 hurricane season and then recovered in Jan 2020. Preliminary analysis of the data for the first deployment determined that the vertical locations on several sensors were higher than expected astronomical tides as few events were recorded. Thus, the vertical locations of these sensors were lowered for the second deployment. The spatial positions of all sites remained the same for both deployments. Although no tropical storms were observed, several astronomically higher-than-normal water levels events were recorded. Observed pressure data is encrypted and the stored on high-capacity SD card located inside the sensor with each detected event saved as a separate file. After a deployment, the sensors were opened, data recovered, and then post-processed. The first intermediate post-processing step includes unpacking and decrypting the data, determining the time of each observation, and conversion of observation units. Then as a final post-processing step, water pressure measurements were converted to a delta water level above the sensor using a hydrostatic approximation. Time varying air pressure used in the conversion were obtained from three nearby NCEI sites. Each sensor was provided with a preferential ordering of the site in case data for a particular time-period was missing. With the delta water level determined, this value was adjusted to be referenced to the collar of the union, the location at which the GPS fixes to Geoid12a (NAVD88) were made. As the sensors were mounted to potentially growing vegetation, fixes were obtained at both deployment and recovery. For the vertical reference datum conversion from the top of the collar to NAVD88, the vertical position of the collar was assumed to move linearly from deployment to recovery. While the horizontal accuracy of the GPS fixes was good for the needed resolution, in some cases, the vertical accuracy was reported to be on the order of several cm, however, in other cases, the accuracy was 50 cm. Thus, the conversions to the NAVD88 become somewhat questionable until the point at which they can be further compared with simulated water levels. Unfortunately, vertical inaccuracies are a common probably with remote coastal sites as the ability to take sight lines or to triangulate the RTK is limited. In general, the post-processed GPS fixes were reported to be less accurate. As such, although nearly all the sensors report reasonable vertical heights, it is still recommended to demean the data and focus on relative change in water level and/or the magnitudes/periods of recorded waves. Due to the high sample rate, the events being individually recorded, and the large number of events recorded, an additional optional post-processing utility was developed to extract data for one or more sensors for all events occurring in a specific time-period. This utility then output data in a format compatible with Tecplot (see example plots in Figure 5), although it would be easily adaptable to output a different data format. Intermediate and final post-processed data has been included. Additionally, some example data plots as well as plots showing the time-period in which the events occurred have been supplied as well. NOAA National Centers for Environmental Information +1-301-713-3277 ncei.info@noaa.gov pointOfContact In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Text (ASCII) CSV OpenDocument Spreadsheet (ODS) JPEG PDF 237909.54 https://doi.org/10.25921/src6-qm37 HTTPS Web browser NCEI Dataset Landing Page Navigate directly to the URL for a descriptive web page with download links. information https://www.ncei.noaa.gov/metadata/granule/geoportal/?from=0&size=10&esdsl=%7B%22query%22%3A%7B%22bool%22%3A%7B%22must%22%3A%5B%7B%22query_string%22%3A%7B%22analyze_wildcard%22%3Atrue%2C%22query%22%3A%22fileid%3AACUNE-EpisodicMonitoring.*%22%7D%7D%5D%7D%7D%7D#searchPanel HTTPS Web browser Granule Search Search for data granules belonging to this collection (a granule is the smallest aggregation of data that can be independently described and retrieved). search series NCEI Accession 0244860 v1.1 was published. 2022-01-13T12:35:28Z NCEI Accession 0246055 v1.1 was published. 2022-02-12T01:41:28Z NCEI Accession 0244397 v1.1 was published. 2022-02-12T08:17:21Z NCEI Accession 0246938 v1.1 was published. 2022-02-25T21:54:06Z NCEI Accession 0246055 was revised and v1.2 was published. 2022-03-05T01:47:51Z NCEI Accession 0244860 was revised and v2.2 was published. 2022-07-19T04:06:52Z asNeeded Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness. NOAA National Centers for Environmental Information custodian GPS GPS Global Positioning System receiver satellite-based instrument used for geo-location, positioning and navigation pressure sensor pressure sensor GCMD instruments - In Situ/Laboratory Instruments > Pressure/Height Meters > PRESSURE SENSORS ASFA Thesaurus - pressure sensors http://www4.fao.org/asfa/asfa.htm water level recorder water level recorder A seabed mounted unit calculating water level by means of precise measurements of hydrostatic pressure.