Use of Lidar of Data Extraction

Presented by Dan Allee, Philip Burkhart, and Lance Yarema - City of Tyler

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?