Remote Sensing for Statewide Digital Geospatial Database

Transcription

1 Remote Sensing for Statewide Digital Geospatial Database Photogrammetry: Collecting and processing digital aerial imagery. Brenda Browning, C.P.

2 Objective: Collection, processing, and disbursement of digital aerial imagery for use in the Statewide Geospatial Database.

3 What it takes Ground Control Flight Planning Specifications Desired Camera Sensor & Aircraft Personnel IT Hardware/Lines/Server Capacity

4 Ground Control Planning Real world location (vert./hor.) Laying out GPS ground control Use, Targeting & Painting of points GPS/RTK collection of points

5 Ground Control/Targets

6 Aerial Planning Creating flight maps (Lines, AOI s) Altitude & Speed Flight constraints (Weather, leaf off, restricted areas)

7 MissionPro Flight Planning

8 ASPRS Specifications 6 GSD Imagery RGBN 8 bit (16 bit later on) Ground horizontal of 15 cm 6 Ground vertical of 30 cm - 12

9 Leica DMC III on a King Air C90

10 Softwares Inertial Explorer Hexagon Software Suite (8 total) ISAT/Geomedia ArcGIS

11 Technology Needs Cost/availability/logistics of IT needs 10 GB Network Lines Workstation Specs 2 PB Server Space Expected

12 Difficulties SmartNet & C4G locations Weather Leaf off conditions Availability of aircraft

13 So Far. Collected all of Northeast Louisiana, a total of 9 parishes. Baton Rouge City Limits Washington Parish, as well as part of Tangipahoa, and St. Tammany.

14 Flown so far

15 LA I-10 INTERCHANGE

16 RUSTON BEARCATS

17 Prospects Collection of Priority areas for USGS 3DEP program. Collection of all large metropolitan areas at 4 GSD. Delivery of Orthophotos to GIS Mapping Section for use on the DOTD Database. 20% of state on reoccurring yearly basis.

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19 Moving DOTD into the Digital Age with the Collection of Lidar Data 2018 Louisiana Transportation Conference Kurt Johnson Lidar Remote Sensing Clay Cranfield, Todd Doise, Chris Pennington, Craig Allen, Bertin Evina-ze, Corey Chatelain, Jeremy Coffey & John Barham

20 Why Collect Lidar?.to provide QL1 geospatial data for: The Statewide Topographic Mapping Program DOTD Operations Statewide Improve GIS analyses both currency and accuracy QL 1 > 8.0 pls/m 2 QL 2 > 2.0 pls/m 2 USGS spec. for 3DEP

21 High-level Overview of DOTD s Collection Program What is Lidar Collection Area and Approach Examples of early results

22 What is LiDAR? It s and Acronym Li D AR Light Detection And Ranging Similar to. Ra D A R Radio Detection And Ranging

23 LiDAR Characteristics: An Active Sensor has it s own energy source i.e. night or day Uses Laser Technology as it s light source certain wavelengths can penetrate water for Bathymetric applications Emits Rapid Pulses of Light Ranging Time for a light pulse to travel to an object and then be bounced back that calculated time value equals distance Typically down to centimeter level.

24 LiDAR is a surveying method that measures distance to a target by illuminating the target with pulsed laser light and measuring the reflected pulses with a sensor. Differences in times of the laser returns and wavelengths can then be used to make a digital 3-D representation of the target area.

25 LiDAR Collection Approach and Organization

26 DOTD Collection Area

27 Other Collection Activities DOTD NRCS / USGS Amite River Watershed HUC Existing QL 2

28 Block Grid Organization

29 Quarter Block Division = 500 sq miles/quarter block All Total More Than 4000 sq Miles

30 Combined Survey Pts for Quarter Block 16-NE Base Station, NVA, VVA, GCP Points

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33 Beechcraft King Air Twin Turbo Prop

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35 Flight Plan Development

36 Developed Flight Plan

37 Operator Flight Console

38 On board Operating the Leica ALS 80 Lidar Equipment

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41 Raw Data Examples from Our First Collection

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47 Sequence Example: Photo Raw Classified DEM

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52 Examples Comparing Resolution:

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56 Thank You for Your Attention Wednesday 11:00 12:00 Session 78: Statewide Topographic Mapping Program Questions?