Use of Lidar of Data Extraction

Transcript

1. Use of LiDAR in Data Extraction Presented by Dan Allee,

   Philip Burkhart, and Lance Yarema, City of Tyler

2. 1) What is LiDAR? 2) How this project started? 3)

   What are the applications? 4) Closing remarks and questions Scope of the Presentation

3. What is LiDAR?

4. What is LiDAR? LiDAR – Light Detection and Ranging Beams

   of light for gathering data

5. LiDAR can classify • ground • roads • trees •

   buildings, etc. What is LiDAR?

6. An airplane with LiDAR system sends light energy to the

   ground where pulse hits the ground then returns back to sensor. What is LiDAR?

7. The pulses measure how long it takes for light to

   return back to the sensor. This creates the variable distance to the Earth. What is LiDAR?

8. What is LiDAR? LiDAR does not have to use the

   direct nadir, but scans at angles. This is taken into account when calculating the elevation.

9. LiDAR sends160,000 pulses per second creating millions of points of

   elevation data. What is LiDAR?

10. For ground obstruction like tree canopies, the light pulses will

    hit the leaves with multiple returns where it eventually reaches the ground. What is LiDAR?

11. How this project started?

12. How this project started? City of Tyler was interested in

    LiDAR but never pursued due to cost restraints.

13. How this project started? LiDAR would be ideal where field

    data collecting is inaccessible.

14. How this project started? An opportunity arose in 2014 when

    the TCEQ was conducting a dam failure study for lakes and ponds.

15. How this project started? • City of Tyler - $50,000

    (funded by Half Cents Sales Taxes) • State of Texas - $500,000

16. How this project started? Companies that conducted the project. •Fugro

    Geospatial, Inc. – QA/QC •Atkins North America, Inc. - flying • Williams Aerial and Mapping • McKim and Creed

17. What are the applications?

18. ArcGIS Pro and ArcScene used to process, explore and display

    the LiDAR data

19. Downtown Tyler was the focus

20.  Terrain  City Visualization 2 main themes explored:

21. Starting with LiDAR dataset

22. Extract building footprints

23. Create 2-foot contours

24. Create DEM and display in hillshade

25. Overlay hillshade with building footprints

26. Overlay hillshade with imagery

27. Visualizing downtown with LiDAR

28. LiDAR dataset layer in ArcGIS Pro

29. LiDAR dataset layer in ArcGIS ArcMap

30. Comparing LiDAR with imagery

31. LiDAR 3D visualizations of downtown

32. ArcGIS Pro Type here ArcScene

33. LiDAR reveals additional detail

34. Trees around City Hall

35. Oil derrick on top of Austin Bank Building

36. Building profiles

37. Cityscape horizon

38. Closing Remarks LiDAR is a useful tool for terrain and

    surface structure visualization in addition to its initial role in modeling scenarios of hydrological events

39. Questions?

40. None