Coordinate Systems in FME 101 - Webinar Slides
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If you’ve ever had to analyze a map or GPS data, chances are you’ve encountered and even worked with coordinate systems. As historical data continually updates through GPS, understanding coordinate systems is increasingly crucial. However, not everyone knows why they exist or how to effectively use them for data-driven insights. During this webinar, you’ll learn exactly what coordinate systems are and how you can use FME to maintain and transform your data’s coordinate systems in an easy-to-digest way, accurately representing the geographical space that it exists within. During this webinar, you will have the chance to: - Enhance Your Understanding: Gain a clear overview of what coordinate systems are and their value - Learn Practical Applications: Why we need datams and projections, plus units between coordinate systems - Maximize with FME: Understand how FME handles coordinate systems, including a brief summary of the 3 main reprojectors - Custom Coordinate Systems: Learn how to work with FME and coordinate systems beyond what is natively supported - Look Ahead: Gain insights into where FME is headed with coordinate systems in the future 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 - Webinar Slides
- 1. Coordinate Systems in FME 101
- 2. Evie Lapalme Technical Support Specialist Safe Software Dan Minney Customer Solutions Specialist Safe Software
- 3. Welcome to Livestorm. A few ways to engage with us during the webinar: Audio issues? Click this for 4 simple troubleshooting steps.
- 4. Agenda 1. Introduction to FME 2. Coordinate Systems, Projections, and Datums 3. Coordinate Systems in FME 4. Reprojection Engines 5. Custom Coordinate Systems 6. Conclusion 7. Resources & Next Steps 8. Q&A Agenda
- 5. One platform, two technologies FME Form FME Flow Data Movement and transformations (“ETL”) workflows are built here. Brings life to FME Form workflows FME Flow Hosted Safe Software managed FME Flow fme.safe.com/platform FME Enterprise Integration Platform Safe & FME
- 6. If you’ve ever had to analyze a map or GPS data, chances are you’ve encountered and even worked with coordinate systems.
- 7. 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.
- 8. Poll: What is your experience working with spatial data and coordinate systems?
- 9. ● There are 2 ingredients to consider about Coordinate Systems: ○ Projections ○ Datums The Basics
- 10. What is a projection? ● Maps data (coordinates) or locations onto a flat surface (i.e. a map) ● The 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
- 11. Mercator ● Most familiar projection ● Typically used for web mapping ● The farther from the equator, the worse the scale distortions.
- 12. 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
- 13. 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
- 14. 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
- 15. 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 ● Unique origin, axes, and scale ● Ex: State Plane Coordinate Systems
- 16. 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 ○ NAD 83 ○ GDA 2020 ● More accurate ellipsoid measurements produce new datums
- 17. 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
- 18. Datums, Datums Everywhere 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
- 19. Units ● Projected Coordinate Systems ○ Meters ○ Feet ● Geographic Coordinate Systems ○ Decimal Degrees
- 21. Implicit Reprojection ● Set the coordinate system on the writer ● Output data will be automatically reprojected if necessary
- 22. Implicit Reprojection ● No coordinate system specified on the reader? ● FME will detect the coordinate system and set it for you
- 23. Source Coordinate System Setting ● Setting the coordinate system on the reader will override coordinate system read from data ● Use with caution
- 25. Reprojection Engines ● Csmap ● Esri ● Proj ● More control ● Match destination application ● Choice of reprojection engines
- 26. Reprojector ● Reproject during the process ● Working with source data in different coordinate systems - reproject to match
- 27. CsmapReprojector ● WGS84 pivot supplemented by more direct transformations ● We can choose valid transformation from list
- 28. Csmap Reprojection Engine ● Simple to use ● Large library of predefined coordinate systems ● Easy datum transformations, through WGS84 ● Direct Grid transformations
- 29. EsriReprojector ● If you are an ArcGIS user, you may prefer to use the EsriReprojector. ● This uses Esri’s reprojection engine, including coordinate system and transformation definitions.
- 30. PROJReprojector ● Largest library of coordinate systems ● Can automatically download transformation grids ● Automatic or manual modes
- 31. National Reprojectors Country-specific reprojection engines Limited coordinate systems and range ● Sweden ● United Kingdom ● Switzerland
- 32. AttributeReprojector ● We can reproject attributes as well ● Need to set X and Y pair
- 33. Local Coordinate Systems ● Writing to 3D formats with limited precision ● Measuring distances and areas of lat/long data ● Calculated or user set origin
- 34. Poll: What reprojection engine do you use most?
- 36. Custom Coordinate Systems ● Esri - create in ArcGIS ● PROJ - use PROJ or WKT in manual mode ● CSMAP - use online tool fme.ly/Coordsys
- 37. Demo 1. Use Web App (online tool) 2. Download Coordinate System 3. Place Coordinate System with Files
- 38. Conclusion
- 39. The Future of Coordinate Systems in FME ● Outdated datums (NAD 83. GDA 94) ● Support for existing & legacy coordinate systems will continue ● New coordinate system & datum support depends on the reprojection engine Source: National Geodetic Survey - “New Datums: Replacing NAVD 88 and NAD 83”
- 40. Summary ● Proj has the most up to date libraries. ● Csmap is most customizable as you are able to use you own custom coordinate systems. ● Choose the reprojection engine and transformer that suits your needs best!
- 41. Resources
- 42. Coordinate System Resources ● Landing Page: Coordinate Systems ● Documentation: Coordinate Systems ● Working with Coordinate Systems in FME Resources
- 43. Get our Ebook Spatial Data for the Enterprise fme.ly/gzc Guided learning experiences at your fingertips academy.safe.com FME Academy Resources Check out how-to’s & demos in the knowledge base support.safe.com Knowledge Base Webinars Upcoming & on-demand webinars safe.com/webinars
- 44. Next Steps
- 45. We’d love to help you get started. Get in touch with us at info@safe.com Experience the FME Accelerator Contact Us A world where data is not just a commodity but a catalyst for real change. fme.safe.com/accelerator Next Steps
- 46. ClaimYour Community Badge & Dive into the new Community! ● Get community badges for watching webinars ● community.safe.com ● Today’s code: YR5GY9 Join the Community today! Next Steps
- 47. Q&A
- 48. ThankYou Recap of Next Steps 1 Join the FME Community 2 Contact us 3 Experience the FME Accelerator Please fill out our webinar survey