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Coordinate Systems in FME 101

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Who is Mercator, and how did he change navigation forever? If you’ve ever had to analyze a map or GPS navigation data, chances are you’ve encountered and even worked with the world of coordinate systems. Coordinate systems are becoming more and more important now that we have historical data that is continually updating and moving through GPS systems. But, not everyone knows why we have coordinate systems, or how to deal with them in a way that will maximize the value of their data.

During this webinar, you’ll learn exactly what coordinate systems are and how you can use FME to transform your coordinate system data in an easy to understand way, accurately represented in the geographical space that it exists within. Our team of Support Specialists will walk you through:

- An overview of coordinate systems
- Why we need datums and projections, and units between coordinate systems
- How FME handles coordinate systems
- A brief summary of the 3 main reprojectors
- Issues with datums and why we are moving towards a time based datum
- Where we are heading with FME on coordinate systems

Don’t miss the opportunity to improve the value you receive from your coordinate system data, ultimately allowing you to streamline your data analysis and maximize your time. See you there!

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Coordinate Systems in FME 101

  1. 1. Coordinate Systems in FME 101 with Dave and Kailin
  2. 2. How to use this deck This deck follows a “Story” structure. It’s set up to draw the audience in and hold their attention. To give your most effective presentation, follow the suggested format and read the tips added to the Speaker Notes section. That being said, make this deck your own! There are TONS of slide options for you to use. You can find them when you add a new slide. →
  3. 3. Meet the Presenters Dave Campanas Senior Strategic Technical Support Specialist Kailin Opaleychuk Technical Support Specialist, FME Desktop
  4. 4. Agenda ● Introduction to FME ● Introduction to coordinate systems, projections, and datums ● History of how FME handles coordinate systems ● Discussion of the 3 main reprojection engines in FME ● The future of coordinate systems in FME
  5. 5. Our Mission To help you maximize the value of your data.
  6. 6. Company Profile Safe Software Years of solving data challenges 25+ 10,000+ Organizations trusting us worldwide Partners supporting our network 150+ 128 Countries with FME customers
  7. 7. FME® Integration Platform Connect. Transform. Automate. FME Desktop FME Server FME Cloud Build & Run Data Workflows Automate Data Workflows (on-premises) Automate Data Workflows (cloud) Get a free trial of FME Desktop and FME Server at safe.com
  8. 8. Connect Data between 450+ systems Extend Capabilities with custom connections, transformers, R & Python Run Workflows locally or publish to FME Server FME Desktop Quickly author repeatable, self-documenting data integration workflows using an intuitive visual interface. No coding required.
  9. 9. Unrivaled Data Support
  10. 10. If you’ve ever had to analyze a map or GPS data, chances are you’ve encountered and even worked with coordinate systems.
  11. 11. But not everyone knows why we have coordinate systems. Or how to deal with them in a way that will maximize the value of their data.
  12. 12. Poll: What is your experience working with spatial data and coordinate systems?
  13. 13. The Basics There are 2 ingredients to consider about Coordinate Systems: ● Projections ● Datums
  14. 14. What is a projection? ● Used to map data or locations on a flat surface, through mathematical algorithms ● A projections goal: accurately model features on 2D plane using linear units (such as feet, meters, etc.) ● Commonly used projections in GIS: ○ Mercator ○ Transverse Mercator ○ Lambert Conformal ○ Lambert Azimuthal Equal Area
  15. 15. Mercator ● Most familiar projection ● Typically used for web mapping ● The farther from the equator, the worse the scale distortions. https://thetruesize.com/ “Mercator with Tissot's Indicatrices of Distortion” by Justin Kunimune is licensed under CC BY-SA 4.0
  16. 16. Transverse Mercator ● Variation of mercator projection ● Good for North/South mapping ● Distortions increase East and West of central meridian Standard Transverse “Spherical Transverse Mercator” by Peter Mercator is licensed under Public Domain “Comparison of Mercator projections.svg” by cmglee, US government, Clindberg, Palosirkka is licensed under CC BY-SA 4.0
  17. 17. Lambert Conformal ● Mid-latitude, East/West dominant data mapping ● Preserves shapes well “Lambert conformal conic projection SW.jpg” by Strebe is licensed under CC BY-SA 3.0 “Conformal Conic with Tissot's Indicatrices of Distortion.svg” by Justin Kunimune is licensed under CC BY-SA 4.0
  18. 18. Local coordinate systems ● BIM, CAD and 3D datasets often have local coordinate systems ● Determine lat/long of reference point ● Create custom Azimuthal Equal Area coordinate system ● Assign to features
  19. 19. Lambert Azimuthal Equal Area ● Very low distortion around local area of origin lat/long ● Can be used anywhere in the world “Lambert azimuthal equal-area projection SW.jpg” by Strebe is licensed under CC BY-SA 3.0 “Lambert azimuthal equal-area with Tissot's Indicatrices of Distortion.svg” by Justin Kunimune is licensed under CC BY-SA 4.0
  20. 20. Datums in GIS ● A Datum: model of the Earth (ellipsoid) that is tied to a particular spot on the Earth ● Different regions use different reference points, and so will have different datums ● More accurate ellipsoid measurements produce new datums
  21. 21. Datums, Datums Everywhere ● Reprojecting data often requires transforming between datums ● Two types of datum transformations ○ Mathematical ■ Three Parameter (Geocentric) ■ Four Parameter ■ Seven Parameter (incl Bursa/Wolf) ■ Ten Parameter (Molodensky-Badekas) ○ Adjustment Grids ■ NTv2 ■ NADCON
  22. 22. Why do we need so many datum transformations? ● Plate tectonics moves datums ○ 2m shift in Australia over last 25 years ● WGS84 tied to geoid, not surface ○ GPS datum doesn’t move Datums, Datums Everywhere
  23. 23. Units ● Meters ● Feet
  24. 24. Working with Coordinate Systems in FME
  25. 25. Demo Overview The Goal What is this demo trying to achieve? The Obstacles What is getting in the way? Why don’t we have the goal already? The Solution How are you going overcome the obstacles to accomplish the goal? (Hint: usually by using FME) The Result The goal was achieved. But why is that so significant? How is life better now?
  26. 26. Simple to use Large library of predefined coordinate systems Easy datum transformations, through WGS84 Direct Grid transformations CSMAP Reprojection Engine
  27. 27. Set the coordinate system on the writer Output data will be automatically reprojected if necessary Implicit Reprojection
  28. 28. Setting the coordinate system on the reader will override coordinate system read from data Use carefully Source Coordinate System Setting
  29. 29. Reproject during the process Working with source data in different coordinate systems - reproject to match Reprojector
  30. 30. We can reproject attributes as well Need to set X and Y pair AttributeReprojector
  31. 31. Some users needed more control over transformations Needed to match ArcGIS/QGIS transformations Choice of reprojection engines Named Reprojectors
  32. 32. WGS84 pivot supplemented by more direct transformations We can choose valid transformation from list CsmapReprojector
  33. 33. Esri reprojection engine included in FME EsriReprojector
  34. 34. Largest library of coordinate systems Can automatically download transformation grids Automatic or manual modes PROJReprojector
  35. 35. Country-specific reprojection engines Limited coordinate systems and range ● Sweden ● United Kingdom ● Switzerland National Reprojectors
  36. 36. Writing to 3D formats with limited precision Measuring distances and areas of lat/long data Calculated or user set origin Local Coordinate Systems
  37. 37. Esri - create in ArcGIS PROJ - use PROJ or WKT in manual mode CSMAP - use online tool Custom Coordinate Systems
  38. 38. ● Vertical Coordinate System support ● Time Dependent Datum Transformations Future Developments
  39. 39. Poll: Which reprojector do you use most often in FME Workbench?
  40. 40. Don’t waste the chance to streamline your data analysis and save time.
  41. 41. Summary Points Coordinate systems support in FME is all about choice: - Simple or Complex - Reprojection Engine - Predefined or Local/Custom
  42. 42. You can maximize the value of your coordinate systems data. You can be more productive and focus on the work that matters when your coordinate systems data is validated, clean, and where it needs to be.
  43. 43. Next Steps Download FME 2021.2 Choose your Engine Start reprojecting Free Trial | Upgrade
  44. 44. Perpetual License Cloud Deployment Licensing Options ● Includes permanent license + annual maintenance ● Designed for smaller deployments ● Unlock enterprise automation without the hassle of hardware ● Flexible pricing options including hourly and annual subscription More info: safe.com/pricing Subscription Licenses ● Subscription program ● Ideal for cross-department deployments
  45. 45. Resources Article: Key Concepts in Coordinate Systems and Mapping Documents: FME Coordinate Systems
  46. 46. Claim Your Community Badge Get community badges for watching webinars! fme.ly/WebinarBadge Today’s Code: LMBCA
  47. 47. November Community Connection FME Community Postcard Exchange ● Open Now: Submit your name and contact information ● Mid-November: Get matched to another community member(s) - or Safer ● Send them a postcard or holiday card ● Receive cards in return from other members http://fme.ly/CardExchange2021
  48. 48. Q&A
  49. 49. Thank you! Download FME 2021.2: Free Trial | Upgrade Connect with us in the FME Community Connect with us for more FME

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