PRESENTED BY: MARCUS GLASS
High Density LiDAR&
Photogrammetric Point Clouds
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDAR
What is “High Density”
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDAR
How to we achieve high point densities?
1. Points per meter……low & slow 2. Double Coverage
3. System Specifications 4.Multiple Returns or Full Wave Form
3Di | GeoTerra Mapping Group
12 to 20 points per square meter!
HIGH DENSITY LIDAR
What do we do with so many points?
Superior vegetation penetration
Object identification (manual and automated processing)
Detection of small linear objects
3D City Modeling / Mapping
Improved vegetation analysis
Electrical transmission - existing
Integration with Ground Based LiDAR
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDARRail Corridor
Sheep
Grape Vines
HIGH DENSITY LIDAR
Rail Corridor
Rail Line
Overhead Transmission
12 to 14 Pointsper meter
HIGH DENSITY LIDARRail Corridor
HIGH DENSITY LIDARRail Corridor
14 points per meter
ITD Road Corridor
West of
Twin FallsIdaho
HIGH DENSITY LIDAR
HIGH DENSITY LIDARRoad Corridor
HIGH DENSITY LIDARRoad Corridor
HIGH DENSITY LIDARRoad Corridor
Transmission Lines
12 to 14 points per meter
HIGH DENSITY LIDARRoad Corridor TIN
HIGH DENSITY LIDARTransmission Corridor
HIGH DENSITY LIDARTransmission Corridor
HIGH DENSITY LIDARTransmission Corridor
Bare Earth – Transmission Classified
All Returns – Transmission Classfied
HIGH DENSITY LIDAR
Transmission Corridor“Classified LAS Data Set”
40 points per meter
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDAR
Transmission Corridor“Classified by Height”
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDARTransmission Corridor – Line SAG
Visible & Measurable Line SagEWEB, Eugene, Oregon
Height Classified LiDAR26 to 30 PPMUrban Corridor
3Di | GeoTerra Mapping Group
Height Classified LiDAR Points with Intensity Image Date26 to 30 PPMUrban Corridor
3Di | GeoTerra Mapping Group
Classified LiDAR Points with Intensity Image Date26 to 30 PPMUrban Corridor
HIGH DENSITY LIDAR
TransmissionCorridor
Copper Lines
HIGH DENSITY LIDAR
TransmissionCorridor
Copper Lines
LiDAR Return Density
INTENSITY IMAGES
12
HIGH DENSITY LIDAR
Floodplain Mapping with LiDARColorized Points - DSM
Manastash, Washington
12 to 14 points per meter
3Di | GeoTerra Mapping Group
HIGH DENSITY LIDAR
Vegetation
Identification&
Management
PHOTOGRAMMETRIC DTM3Di | GeoTerra Mapping Group
TIN – TRIANGULAR IRREGULAR SURFACE
3D SURFACE
PHOTOGRAMMETRIC
AUTOMATED POINT CLOUD GENERATION
1 meter grid blocks
Pixel Resolution = 0.5’Autocorrelated Grid at 36 points per meter LiDAR 32 to 36 points per meter
3Di | GeoTerra Mapping Group
1 Foot Pixel
AUTOMATED POINT CLOUD GENERATION – 1 FOOT PIXEL IMAGERY – 9 PTS. / METER
AUTOMATED POINT CLOUD GENERATION – 1 FOOT PIXEL IMAGERY – 9 PTS. / METER
SHADED RELIEF MAP
3Di | GeoTerra Mapping Group
AUTOMATED POINT CLOUD GENERATION – 1 FOOT PIXEL IMAGERY – 9 PTS. / METER
3D VIEW – DRAPING ORTHO TO DEM
3Di | GeoTerra Mapping Group
Full Return
AUTOMATED POINT CLOUD GENERATION
Classified Vegetation - Ground
Classified Vegetation – Bare Earth
AUTOMATED POINT CLOUD GENERATION
DSM – Digital Surface Model / Colorized Points Full Point Cloud
3Di | GeoTerra Mapping Group
FULL POINT DENSITY – CLASSIFIED POINTS (36 PPM)
AUTOMATED POINT CLOUD GENERATION
First Return Filtered
Final Ground
0.5’ Grid Density36-40 points/meter
3Di | GeoTerra Mapping Group
AUTOMATED POINT CLOUD GENERATION5’ Grid Spacing
Half-foot Grid Spacing Two-foot Contours
Marcus Glass, CP
3Di, Inc.
Eugene & Portland, OR and
Boise, Idaho
Direct - 503.577.2613
3Di | GeoTerra Mapping Group
![Point Density Evaluation of Airborne LiDAR Datasets · variable mission costs [Saylam, 09]. The expected point density of LiDAR scanning is mainly dependent on mission plan parameters](https://cdn.vdocuments.net/doc/165x107/5ae190957f8b9a097a8bd8ad/point-density-evaluation-of-airborne-lidar-mission-costs-saylam-09-the-expected.jpg)
