Certified Reliability Engineer Primer Free Downloadzip
Hedda Tillmon
Below is a collection of NGS publicly-given presentations that have beencollected for viewing by the public. You can also view a list of upcoming presentations by visiting the Upcoming and Recent Presentations Calendar. For more information contact ngs.pres...@noaa.gov.
This paper analyzes the results from observations of the water surface throughthe Great Lakes in North America. The border between the two countries isroughly 8900 km and extends through the middle of many of the Lakes. Treatiesalso emphasize equal access to the waters in the Lakes. Hence, adoption of acommon reference system is essential. The U.S. and Canada jointly administer theGreat Lakes through a number of organizations including the CoordinatingCommittee on Great Lakes Basic Hydraulic and Hydrologic Data. This paper focuseson collaborative work of the Vertical Control and Water Level Working Group toprovide the International Great Lakes Datum of 2020 by 2025 to provide anupdated reference frame for operational, scientific, emergency management, andother various applications. IGLD 2020 will use the same geopotential model asthe North American Pacific Geopotential Datum of 2022 (NAPGD 2022). NAPGD2022 isbeing realized as both a geoid height model and a gravity field model at onearcminute. These models will be combined with GNSS observations of mean watersurfaces throughout the Great Lakes to determine dynamic heights. Comparisonswill be made on each Lake to estimate the potential for a permanent watertopography that would indicate the need for hydraulic correctors (HCs). Theexpectation is for little or no need for HC in IGLD 2020, but that must be borneout by investigations of the dynamic heights. Both leveling and GNSS werecollected in 2022, and these data have provided the basis for evaluating theneed for hydraulic correctors in IGLD 2020. GNSS observations - both campaignand continuous - unify observations on geodetic control bench marks throughoutthe region in IGS14 reference frame. Spirit leveling then connects the benchmarks to water station datums to define the IGS14 coordinates of the water levelobservation station datums. While significant variations occur to the waterlevels over decadal periods, modeling has accounted for relative variations dueto GIA signal and drought and flood signals. This permits modeling over longerperiods of time (e.g., 20 years) to better estimate the need, if any, forhydraulic correctors.
An update on the status and development of the regional reference frame for theAmericas and contributions to the global geodesy community of practice. Emphasisis on the organization and results with an eye to aiding other regionas indeveloping their regional reference frames.
You've all seen that graphic, the one that illustrates the many layers of a GIS.At the bottom of that graphic is the geodetic control (if its shown at all!),which serves as the framework for all the other layers of truly valuable data.Have you taken it for granted that this framework (the lat/long, SPCS grids,etc), are always there for you? Maybe you've been hearing for years about theforthcoming datum changes (when NAD83 and NAVD88 will be replaced) but you stilldon't understand how that may impact you. Included will be a comparison of theexisting PA SPCS83zones and the future SPCS2022 zones. Join this session for adiscussion on the potential future of the "bottom layer" of the PA BaseMap 2030,and bring your questions/inquiries.
This presentation provides background and history on gravity meters, anexplanation of how and why they're used at NGS, and then focuses on theprinciples of absolute gravity meters in particular. The presentation concludeswith a description of the 2023 "International Comparison" in Boulder, CO,and other international efforts in place to ensure these instruments areaccurate and consistent worldwide.
NOAA's National Geodetic Survey (NGS) defines, maintains, and provides access tothe National Spatial Reference System (NSRS), which is a common foundation forgeospatial data that serves as the basis for civilian surveying and mapping inthe United States. Changes in technology and a better understanding of thedynamic earth have made it necessary to improve the NSRS to be of better use formodern applications. Currently, NGS is in the process of modernizing the NSRS,updating the existing horizontal datums with a suite of geometric referenceframes and the vertical datums with a gravimetrically-derived geopotentialdatum. Part of the modernization process involves updating NGS products andservices to support users of the Modernized NSRS. Such updates includecoordinate conversions and transformations, geodetic control, GNSS dataprocessing, the Continuous Operating Reference Station (CORS) network, aerialimagery, shoreline and the many tools and datasets that make the NSRS possible.An entirely new State Plane Coordinate System is also being developed. For boththe existing and future NSRS, the goal of NGS is the same: to best meet thediverse positioning needs of the entire U.S. geospatial community that includessurveyors and GIS professionals. Learn how NGS is striving towards this goalduring this session.
High quality field data is a critical component of any surveying product, andthe programs and modernization efforts within NGS/NOAA are supported by a teamof surveyors and cartographers in the Field Operations Branch. NGS executes avariety of geodetic surveys to support the development and modernization of awide array of critical products. This webinar will discuss recent and on-goingfield activities, how they support products you rely on, and give a deeper lookinto how complex field projects are executed. The role NGS plays in thedevelopment of the International Terrestrial Reference Frame will be described,focusing on the survey of local ties at colocation sites where multiplespace geodetic techniques exist. This topic will explore the unique scope ofwork and difficulties faced when measuring between a variety of sensors at thesame observatory. This overview will give the audience a better understanding offield operations at NGS and the role they play in NGS, NOAA, and internationalproducts widely used by many.
NGS's Online Positioning User Service (OPUS) provides free, easy access to theNational Spatial Reference System (NSRS) by allowing users to upload their GPSdata to NGS to be processed. In the past, submitting data to NGS using theFederal Geodetic Control Subcommittee (FGCS) standard titled Input Formats andSpecifications of the National Geodetic Survey (NGS) Data Base (also known asthe "Bluebook") was challenging. Today users can easily submit all thenecessary information for loading into the database using OPUS Projects. Thissession will examine a few surveys in Colorado and discuss the entire process ofsubmitting surveys to NGS including planning, proposal, execution, adjustmentand submission.
NOAAss National Geodetic Survey (NGS) defines, maintains, and provides access tothe National Spatial Reference System (NSRS), which is a common foundation forgeospatial data that serves as the basis for civilian surveying and mapping inthe United States. Changes in technology and a better understanding of thedynamic earth have made it necessary to improve the NSRS to be of better use formodern applications. Currently, NGS is in the process of modernizing the NSRS,updating the existing horizontal datums with a suite of geometric referenceframes and the vertical datums with a gravimetrically-derived geopotentialdatum.
The National Oceanic and Atmospheric Administration's (NOAA) National GeodeticSurvey (NGS) has been providing the positioning infrastructure for the nationsince 1807 when Thomas Jefferson created the Survey of the Coast. Societycontinues to learn more about how dynamic our world is, through improvements intechnology with satellite based positioning, and other new systems ofmeasurement that did not exist when today's National Spatial Reference System(NSRS) was developed. The modernized NSRS will provide a precise, consistent andaccurate positioning infrastructure that is readily and easily accessibleprimarily through Global Navigation Satellite System (GNSS) observations. Thiscourse will discuss the maintenance done for today's NSRS, the NSRSModernization efforts and how it will impact surveying in the near future.
NGS is in the process of modernizing the National Spatial Reference System(NSRS), replacing the existing horizontal and vertical datums with a suite ofterrestrial reference frames and a new geopotential datum. The NSRS provides acommon reference so geospatial data collected at different times by differentpeople can be compared. A set of coordinates does not tell much withoutincluding what those coordinates are referenced to, but by specifyinginformation about the reference system used, the data are much more meaningful.I will discuss the basics of datums and reference frames, including how they arecreated and how they connect at national and global levels.
NOAA's National Geodetic Survey (NGS) defines, maintains, and provides access tothe National Spatial Reference System (NSRS), which is a common foundation forgeospatial data that serves as the basis for civilian surveying and mapping inthe United States. Changes in technology and a better understanding of thedynamic earth have made it necessary to improve the NSRS to be of better use formodern applications. Currently, NGS is in the process of modernizing the NSRS,updating the existing horizontal datums with a suite of geometric referenceframes and the vertical datums with a gravimetrically-derived geopotentialdatum.
NSRS Modernization has, and continues to be a significant undertaking. Inaddition to new paradigms related to datum definitions, it has also required NGSto rethink how we collect, process, store, manipulate, and deliver data. Inthis session, we will review the need, and status of the major projectsassociated with NSRS Modernization.
b37509886e