1. Elevation Workgroup Update
Chris Morse
IGIC Conference 2017
Bloomington, IN
May 8th-10th

2. Elevation Workgroup Meetings
Scheduled on 4th Tuesday of every month
11 a.m. Eastern Time
Attendance is open to all
We want to hear about YOUR projects!
Share the work you do with elevation data with the group
We utilize the IGIC Elevation Workgroup group for updates/meeting changes

3. Elevation Workgroup Mission
Develop plans, standards, and technical implementation guidance for the IndianaMap elevation framework layers
Bring together elevation data stakeholders and users to share information and knowledge for the creation and uses of elevation data

4. Elevation Workgroup 2016 Report
Formed a 3DEP subcommittee to develop a new statewide elevation plan for QL2 Lidar
Conducted outreach for funding of new QL2 acquisitions in Indiana
Assisted the Executive Director of IGIC in preparing 3DEP proposal for 2017 BAA
Developed presentation for ways to use Indiana Imagery & DEMs in QGIS and CAD (presented at the 2017 ISPLS Conference)

5. Elevation Workgroup 2017 Goals
Work with USGS, NRCS, & vendor to oversee the QL2 Lidar Project
Participate in the USGS Elevation-Derived WBD Workgroup
Seek funding for data support and distribution in state and via Open Topography
Work with IDNR to define requirements for building classification & extraction from QL2 data for all counties and seek funding partners

6. Indiana’s Statewide Elevation Data History
1990s: 30m DEMs
7m vertical
2005: 10m DEMs
3m vertical
2013: 1.5m Lidar Derived DEMs
39 cm vertical
2019: 0.7m Lidar Derived DEMs
19 cm vertical

7. Age and Quality of Indiana QL3 Lidar
USGS 0.9 Lidar Specs
Aggregate Nominal Pulse Spacing: 1.5 m
Aggregate Nominal Pulse Density: 0.5 pts/m2
LAS RMSEz (NV): 30 cm
DEM NVA at 95%: < 39.2cm

8. 2016 QL2 Lidar Project
Marion, Hamilton, & Wayne Counties
Funded by counties & USGS
QL2 LAS data with standard classes and DEMs with hydro break lines, similar to data, just at the higher QL2 quality levels
Collected 2016 & 2017
IGIC is performing QA & coordination with counties & USGS

9. QL2 Lidar Project
Interagency Agreement between Indiana NRCS and USGS to support Lidar acquisition via 3DEP
Goals
Statewide coverage of base specs (point density, classifications, accuracy) [met]
New Lidar derived DEMs with standard USGS Lidar Specs for hydro flattening and break lines [met]
Building classification & extraction [pending]

10. QL2 Lidar Project
Proposal submitted to USGS late 2016
USGS selected proposal
NRCS and USGS are funding the proposal
USGS Geospatial Product and Service Contracts handing the project
USGS did an Internal Government Contract Estimate
USGS selected a 3DEP vendor and gave notice to proceed

11. QL2 Lidar Project
Remaining 89 Indiana Counties
NRCS: $6.725 million
USGS: $159k
Same specifications as 2016 data project
Used as elevation base for parts of the new ortho
STPLE Counties: 2017
STPLW Counties: 2018
Carryover: 2019

12. QL2 Specifications USGS 1.2 Lidar Specs
Aggregate Nominal Pulse Spacing: 0.7 m
Aggregate Nominal Pulse Density: 2.0 pts/m2
LAS RMSEz (NV): 10 cm
DEM NVA at 95%: < 19.6cm

13. QL2 Specifications PCS: NAD 1983 Indiana State Plane
DEM Pixel Resolution: 2.5 ft
Product Tiles: Same as Statewide Ortho Project
Hydro Break Lines:
Flatten Waterbodies > 2 ac.
Streams > 100 ft. wide

14. QL2 Specifications LAS Files: LAS Classes:
ASPRS 1.4 format
LAS Classes:
1: Processed, but unclassified
2: Bare Earth
7: Low Noise*
9: Water*
10: Ignored ground (near break lines)*
17: Bridge Decks*
18: High Noise*
(*artifacts of other processing, not complete sets of these classes)

15. Status of 3DEP QL2 Projects
Marion & Hamilton:
Collected ‘16
Pilot data at USGS
Wayne:
Collected ‘17
Vendor processing
Eastern Counties (‘17):
Green: Collected & Processing
Red: Not acquired/redo
Orange: Reviewing for acceptance

16. Buildings Proposal
Separate project idea to classify buildings and extract footprints (funding needed)
Classify building points into ASPRS LAS 1.4, Class 6
Extract building footprints using new Lidar and Ortho Imagery products
Horizontal Accuracy estimated at 5.0 Ft.
Assign estimated min Z for building interface with surrounding ground using buffers to detect nearby LAS points (+/- 0.5m vertical)

17. Buildings Proposal Buildings = structures with roofs
98% of structures > 1000 ft2
95% of structures > 500 ft2
85% of structures > 100 ft2
Collected structures will have calc’d 2D rooftop area +/-5% of actual area
Building polygons will be simplified to eliminate extraneous bends and intrusions smaller than the point density of the lidar, thus maintaining the essential shape, size and positional accuracy of the building.

18. Questions?