Fusion of Geodesy and GIS at NOAA s National Geodetic Survey

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2 Fusion of Geodesy and GIS at NOAA s National Geodetic Survey Esri Survey Summit July 6-9, 2013 San Diego, CA Michael Dennis, RLS, PE michael.dennis@noaa.gov

3 The Plan Background NGS Data Explorer New Datasheet shapefile GEOCON transformation tool Using GIS for the national adjustment of 2011 NGS GIS Toolbox Where to next? Note that GIS is used for: Very high accuracy work Wide variety of geodetic visualization and analysis

4 NGS: Who we are is where you are Been around a long time Began as Survey of the Coast in 1807 Renamed US Coast & Geodetic Survey in 1878 Became National Geodetic Survey in 1970 (when NOAA was created) Keepers of the National Spatial Reference System (NSRS) Define, maintain, provide access for US and territories Position, height, scale, gravity, orientation, and how they change with time NSRS composed of many parts, such as: North American Datum of 1983 (and its various realizations) North American Vertical Datum of 1988 Official National Shoreline Products & Services Geodetic control (active and passive) Data, models, and imagery (gravity, geoid, aerial imagery) Tools and services (online and desktop software and services) Standards, specifications, guidelines, and education

5 NGS: We re not quite where you are (yet) The NSRS is the foundation for GIS But we at NGS don t use GIS much ourselves Land Ownership Transportation Surface Waters Boundaries Elevation Aerial Imagery Geodetic NSRS *80*0002JOYNER N W Control NCBA *86* A22Y88NGS A41A *80*0003ROANPORT N W NCBA *86* A21Y88NGS A41A

6 Alaska Pacific (MA11) CONUS Pacific (PA11)

7 NGS Data Explorer New online interactive Datasheet retrieval Uses Google Map interface Allows searches geographically and by control type CORS, GPS, Classical horizontal, Vertical Created from monthly Datasheet shapefiles Selection options will evolve over time Not directly connected to NGS database (yet)

8 NGS Data Explorer

9 New NGS Datasheet shapefile (beta) Shapefiles created monthly All publishable stations (~800,000) Available via anonymous FTP by state at: ftp://ftp.ngs.noaa.gov/dist/beta_products/ds_archive /Shapefiles/ New attributes added to datasheet shapefile Added 27 and removed 6 fields (for total of 56) Renamed 6 fields Increased numerical precision of dec deg lat/lon Updated georeferencing to NAD 83(2011)

10 GEOCON and GEOCON11 (beta) Transformation grids for latest realizations of NAD 83 GEOCON: NAD 83 HARN NAD 83(NSRS2007/CORS96) GEOCON11: NAD 83(NSRS2007/CORS96) NAD 83(2011) Both horizontal AND vertical (i.e., ellipsoid height) 1 arc-minute spatial resolution Include output that indicates quality of transformation Quantified using station within grid cell that is worst match with model Complication: Some states have > 1 HARN realization Beta release only uses Bluebook format as input/output Difficult to use because format not readily available Will provide more flexible input and output soon

11 GEOCON and GEOCON11 (beta)

12 GEOCON and GEOCON11 (beta)

13 GEOCON and GEOCON11 (beta)

14 GEOCON and GEOCON11 (beta)

15 GEOCON and GEOCON11 (beta)

16 GEOCON and GEOCON11 (beta)

17 GEOCON and GEOCON11 (beta)

18 GEOCON and GEOCON11 (beta)

19 Introducing the NGS GIS Toolbox New Geodetic GIS tools Standard NGS ASCII output files used as input Python used to convert to point, line, polygon, and raster features Creates attribute-rich vector features in standard GIS format Used for display and analysis of results Currently consists of 5 Toolsets GPS Tools: Positions, GNSS vectors, error estimates, residuals Created to help perform 2011 national adjustment HTDP: Convert output into point features Leveling Tools: Adjusted elevations, loop misclosures, residuals Created to help adjust large statewide leveling networks NGS Grids: Convert NGS ASCII grids to Esri raster format Used to create rasters of geoid models, geoid errors, deflection of vertical Velocity Vectors: Create velocity and displacement vectors

20 NGS GIS Toolbox (ArcGIS) GPS Tools Positions, GNSS vectors, error estimates, residuals HTDP x Leveling Tools x NGS Grids x Velocity Vectors x

21 GNSS network adjustment results as GIS features provides powerful visualization and analysis capabilities

22 NAD 83(2011) epoch Horizontal accuracy, cm (95% confidence)

23 NAD 83(2011) epoch Vertical accuracy, cm (95% confidence)

24 (7 years) 12,803 vectors (3.0%)

25 (11 (7 years) 82,316 12,803 vectors (19.3%) (3.0%)

26 (15 years) 154,500 vectors (36.2%)

27 (19 years) 227,940 vectors (53.4%)

28 (23 years) 327,154 vectors (76.6%)

29 (29 years) 426,977 vectors (100.0%)

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32 NGS GIS Toolbox (ArcGIS) Leveling Tools Adjusted elevations, loop misclosures, residuals HTDP x Leveling Tools x NGS Grids x Velocity Vectors x

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34 NGS GIS Toolbox (ArcGIS) NGS Grids Convert NGS ASCII grids to Esri raster format HTDP x Leveling Tools x NGS Grids x Velocity Vectors x

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43 The Power of GIS

44 NGS GIS Toolbox (ArcGIS) HTDP and Velocity Vectors Convert output to point features, create velocity vectors HTDP x Leveling Tools x NGS Grids x Velocity Vectors x

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47 NAD 83(2011) coordinate shifts

48 Based on 7 constant transformation parameters published by NGS (7 timedependent parameters ignored), at input time = output time of (so tectonic velocities irrelevant). This is how the transformation is implemented in most commercial geospatial software.

49 Based on 14 transformation parameters published by NGS at input time = output time of (so tectonic velocities irrelevant)

50 Based on 14 transformation parameters published by NGS at input time = output time of (so tectonic velocities irrelevant)

51 Based on 14 transformation parameters published by NGS at input time of output time of (5 years of tectonic movement). This much more complex case is the correct transformation.

52 Based on 7 constant transformation parameters published by NGS (7 timedependent parameters ignored), at input time = output time of (so tectonic velocities irrelevant). This is how the transformation is implemented in most commercial geospatial software.

53 Based on 14 transformation parameters published by NGS at input time of output time of The 5 years of tectonic movement has no effect since only horizontal velocities are modeled

54 NAD 83(2011) to IGS08 at epoch

55 NAD 83(PA11) to IGS08 at epoch

56 NAD 83(2011) to IGS08 at epoch

57 Orthometric height change (meters) NAVD 88 to new vertical datum Estimated as NAVD 88 "zero" (datum) surface minus NGS gravimetric geoid

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59 More information geodesy.noaa.gov

60 Where to next NGS GIS toolbox Release soon as ArcGIS Toolbox Also plan to provide access through web interface Future enhancements Topology, survey intelligence Error ellipses, loop closures, occupations, independent observations Other NGS products and services 2011 national adjustment results in GIS format (release soon) Provide NGS products in in GIS format Creation of new spatially-enabled database Education and outreach Increase internal use of GIS by NGS employees Provide internal and external training in using the tools and data Objective: Fully leverage the power of GIS in geodesy

61 Questions?