GIS Data Catalog

RTK Ground Check Points for 2016 King County/Puget Sound Lidar Consortium Lidar Project

View in GIS Open Data

Learn how to use GIS Open Data 🗺

Use this Data

Links

How to use in ArcGIS Pro

Sharing Status Public

Summary

Provide support for high resolution terrain elevation data from the PSLC King County Lidar dataset

Description

RTK ground check points are used to assess the vertical accuracy of the LiDAR data.

Data was processed in reference to NAD83 (CORS96), however the horizontal datum for this dataset is defined as NAD83 (HARN) as the difference is generally small and allows for greater ease of use with data in different datums.

The vertical datum is NAVD88, Geoid 03, and the data is projected in Washington State Plane North.

Units are in US Survey Feet.

Quantum Spatial collected the Lidar data from 02/24/16 through 5/25/2017.

Layer information

Layer Name lidar_2016_groundcheck_point
Subject Category Survey
Title RTK Ground Check Points for 2016 King County/Puget Sound Lidar Consortium Lidar Project
Feature Count 217
Feature Type Point
Next Update None planned
Spatial reference EPSG:2926
Control ID 2600
Place Keywords Pacific NW, King County, WA, Washington State
Theme Keywords Survey, Lidar, RTK, Realtime Kinetic, Ground Check Point, GCP
Supplemental Information

http://www5.kingcounty.gov/sdc/addl_doc/KingCounty2016LidarProjectDocumentation.htm

Table Preview

Attribute information

OBJECTID

From Esri

 Description

Internal feature number.

Domain

Sequential unique whole numbers that are automatically generated.
X

From Quantum Spatial

 Description

Easting

Domain

Easting of the check point in Washington State Plane North, US Survey Feet

Y

From Quantum Spatial

 Description

Northing

Domain

Easting of the check point in Washington State Plane North, US Survey Feet

Z

From Quantum Spatial

 Description

Elevation

Domain

Elevation of the check point, NAVD88, Geoid 03
Shape

From Esri

 Description

Feature geometry.

Domain

Coordinates defining the features.

Contact information

Maintained by KCGIS Center
Primary KCGIS Center

giscenter@kingcounty.gov

Terms of Use

License Terms of use and copyright

Summary

Provide support for high resolution terrain elevation data from the PSLC King County Lidar dataset

Description

RTK ground check points are used to assess the vertical accuracy of the LiDAR data.

Data was processed in reference to NAD83 (CORS96), however the horizontal datum for this dataset is defined as NAD83 (HARN) as the difference is generally small and allows for greater ease of use with data in different datums.

The vertical datum is NAVD88, Geoid 03, and the data is projected in Washington State Plane North.

Units are in US Survey Feet.

Quantum Spatial collected the Lidar data from 02/24/16 through 5/25/2017.

Contact information

Maintained by KCGIS Center
Primary KCGIS Center

giscenter@kingcounty.gov

Terms of use and copyright

License Terms of use and copyright

Change history

3/28/2017

Acquisition.

Quantum Spatial collected the PSLC King County Delivery LiDAR data between 02/24/16 and 05/25/17.

The survey used a Leica ALS80 laser system mounted in a Cessna Caravan 208B.

Data was collected using a multi pulse flight plan.

Near nadir scan angles were used to increase penetration of vegetation to ground surfaces.

Ground level GPS and aircraft IMU were collected during the flight.

Leica ALS80 Instrument Parameters (03/08/2016, 03/11/2016, 03/19/2016): Beam diameter: 26 cm, Pulse rate: 400 kHz, Maximum returns: 4, Speed: 145 knots, Overlap: 63 %, Laser power: 93.7 %, Field of view (FOV): 40°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 874 m, AGL: 1200 m, Average pulse density: 8 ppms Leica ALS80 Instrument Parameters (02/24/2016 - 03/05/2016, 03/18/2016, 03/28/2016): Beam diameter: 35 cm, Pulse rate: 340 kHz, Maximum returns: 4, Speed: 145 knots, Overlap: 63 %, Laser power: 93.7 %, Field of view (FOV): 30°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 857 m, AGL: 1600 m, Average pulse density: 8 ppms .