PUG List 2009 Geodetics & What s New in projection engine. Melita Kennedy

Transcription

1 PUG List 2009 Geodetics & What s New in projection engine Melita Kennedy

2 249/106: GRIDs, workstation versus ArcGIS coordsys GRIDs use the workstation coordsys format Spatial Analyst uses grids internally Have added 80+ datums to Workstation 9.3 Spheroids must be supported in Workstation DHDN, Amersfoort, LGD2006, KUDAMS, REGVEN, RGF93, Tete, etc. Spatial Analyst is being updated to support other raster formats Rasters are using GDAL at 9.4

3 TINs, workstation vs ArcGIS coordsys TINs use the workstation coordsys format Plan to enhance TINs at 9.4

4 Transformations may not work correctly in ArcMap Exists in 9.2 and 9.3 Fixed in 9.3 SP1 and QFE for 9.2 SP4 Affects personal gdb and ArcSDE layers If transformation not set immediately, any later change is not applied Workaround: Set transformation, remove layer from ArcMap, readd it. Or set transformations within mxt/mxd, then add data.

5 231/86: Cannot edit a geometric network in a projected ArcMap data view Not planned yet Use cases/workflows would be appreciated

6 Datum handling Implement Shell-developed solution Easier UI to set transformations Has defaults based on location Not for 9.3; will review Database version of projection engine Can store areas of use (textual/geometric) accuracies

7 232/87: Datum info not exposed Multiple issues are listed here Datum transformation management tool Supporting info like areas of use and accuracies not currently available When we go to DBMS version of library can add this info GP Project tool doesn t show parameter values: NIM005479

8 202/50: Predefined datum and proj shift params Create Custom Geog Transformation tool Requested Improvements Make the.gtf files true ASCII right now they include binary information so ArcGIS can read/write them (NIM001361) Add save functionality to the New transformation dialog in ArcMap (NIM006269) Env. setting to change location of gtf files Include a description (if we go to a dbms PE version) Ability to set a transformation per layer in ArcMap

9 208/60: IDs for custom coordsys (IMS/SDE) PEOBJEDITHOME Environment variable Uses text files to define coordsys/transformations Performance has been dramatically improved Longer term Switching to an EPSG-like database Plan to allow adding custom definitions

10 Polynomial transformations Polynomial-based transformations: post-9.3; in top 5 issues Actively working on six degree poly used for a datum transformation Issues inverse, valid area Prototyping a solution with an improved TM inverse

11 211/64: Projection on the fly very slow Improving performance occurs at each release A projection hint is used Is the data completely within the projection horizon? If so, no need to intersect More work on the projection hint Rasters: very fast Transverse Mercator is being reworked

12 201/49: Store datum/proj shift info in metadata GP tools now store all messages Still to do: Expose this information in ArcCatalog For other procedures that change coordinate system, also store in the metadata

13 Possible Closures Projection transformation options (ArcIMS) Geodesy Projection on-the-fly ArcPad Dimensioning tools

14 79/23: Projection transformation options Issue ArcIMS: Allow a mapservice to support multiple coordinate systems Not planned for ArcIMS Check out ArcGIS Server. ArcMap Server supports client-supplied datum transformations at 9.3

15 46: Geodesy Issue Feature-level coordinate system support Not planned

16 46: Projection on-the-fly (ArcPad) Issue Project on-the-fly vector data Currently, rasters and GPS tracklog shapefile can be reprojected ESRI would like use cases that require vector data to be reprojected (in large scale field work) None provided yet

17 253/110: dimensioning tools Issue Geodetic dimensioning More information requested Brad Dean/Scott Hills/Dave Stodola, ChevronTexaco Workaround is listed without location Speculation? Dimension in layout mode Use geodesic/great circle distances Dimension polygons with geodetic areas

18 Projection Engine

19 New functionality Loxodromes, great elliptic Including densified line Can create a list of one- or two-step transformations Convergence angle See Calculate Geodesic Angle Tool in ArcToolbox Berghaus Star

20 Vertical coordinate systems Can define on vector data Working on transformations now Supports geoid-based and ellipsoid-based heights Heights/Depths VERTCS["NAVD_1988", VDATUM["North_American_Vertical_Datum_1988"], PARAMETER["Vertical_Shift",0.0], PARAMETER["Direction",1.0], UNIT["Meter",1.0]]

21 Vertical transformation methods Geoid models (geoid/ellipsoid height conversion) EGM96/EGM84/EGM08 bilinear and natural spline versions NGS: GEOID06, GEOID99, etc. Others as time permits if you have geoid models you work with regularly, let us know now Single offset Single offset with slope VERTCON

22 Future vertical transformation methods More geoid models EGG97, NZGeoid05, AusGeoid98, others

23 Vertical CS and transformations Rasters still need to store VCS Currently working on GDAL support Still working on exposing in client software

24 Datatase version Have a dbaseiv prototype Database can be included in pe.dll or external Has to support existing functionality so contains the prj file structure Has textual areas of use and descriptions Can replace the database, or have favorites Can have multiple user-defined databases Can localize display names

25 Summary PUG issues Projection Engine work