Tasman LiDAR Index Tiles (2020-2022)
This layer contains the Index Tiles for LiDAR data for the Tasman District captured between 2020 and 2022.
- The DEM is available as layer [Tasman LiDAR 1m DEM (2020-2022)]( https://data.linz.govt.nz/layer/107704 )
- The DSM is available as layer [Tasman LiDAR 1m DSM (2020-2022)]( https://data.linz.govt.nz/layer/107836 )
- The LAS point cloud and vendor project reports are available from [OpenTopography]( https://portal.opentopography.org/datasets?loc=New%20Zealand )
LiDAR was captured for Tasman District Council by ASL Ltd between 28 January 2020 and 30 January 2022. The dataset was generated by ASL and their subcontractors. Data management and distribution is by Toitū Te Whenua Land Information New Zealand.
Data comprises:
- DEM: tif or asc tiles in NZTM2000 projection, tiledinto a 1:1,000 tile layout
- DSM: tif or asc tiles in NZTM2000 projection, tiled into a 1:1,000 tile layout
- Point cloud: las tiles in NZTM2000 projection, tiled into a 1:1,000 tile layout
Pulse density specification is at a minimum of 4 pulses/square metre.
Vertical Accuracy Specification is +/- 0.2m (95%)
Horizontal Accuracy Specification is +/- 1.0m (95%)
Vertical datum is NZVD2016.
Simple
Identification info
- Date (Creation)
- 2020-01-28
- Status
- Completed
- Point of contact
-
Role Organisation Electronic mail address Point of contact Toitū Te Whenua Land Information New Zealand
- Spatial representation type
- Vector
Spatial resolution
Equivalent scale
- Denominator
- 1000
- Topic category
-
- Elevation
Extent
- Geographic identifier
-
nzl
- Title
-
ANZMet Lite Country codelist
- Date (Publication)
- 2009-03-31
- Edition
-
Version 1.0
- Edition date
- 2009-03-31
- Citation identifier
- http://asdd.ga.gov.au/asdd/profileinfo/anzlic-country.xml#Country
- Cited responsible party
-
Role Organisation Electronic mail address Custodian ANZLIC the Spatial Information Council
Extent
))
- Maintenance and update frequency
- Not planned
Resource format
- Title
-
*.xml
- Date
- Edition
-
Unknown
- ANZLIC Jurisdictions
-
-
New Zealand
-
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
-
Copyright of this work is owned by Tasman District Council
© Tasman District Council
- Use constraints
- Copyright
Resource constraints
- Use limitation
-
Released by Toitū Te Whenua Land Information New Zealand under Creative Commons Attribution 4.0 New Zealand (CC BY 4.0) with:
Following Attribution:
"Sourced from the LINZ Data Service and licensed by Tasman District Council, for re-use under CC BY 4.0."
For details see: https://www.linz.govt.nz/data/licensing-and-using-data/attributing-elevation-or-aerial-imagery-data
- Use constraints
- License
- Language
- English
- Character encoding
- UTF8
Resource lineage
- Statement
-
Data Acquisition:
Airborne Laser Scanner (ALS) data was acquired from a fixed wing aircraft between 2020 and 2022 using Aerial Surveys Optech Galaxy PRIME LiDAR system.
Survey Specification:
Scanner: Optech Galaxy PRIME
Flying Height: 2,925 m AMGL
Scan Angle: ±52.0 degrees
Scan Frequency: 45 Hz
Pulse Rate: 400 kHz
Swath Overlap: 55%
Swath Points Per M2: 4
Data Processing:
The LiDAR sensor positioning and orientation (POS) was determined using the collected GPS/IMU datasets and Applanix POSPac software.
Base Station Positions: PP-RTX
The POS data was combined with the LiDAR range files and used to generate LIDAR point clouds in NZTM and ellipsoidal heights. This process was undertaken using Optech LMS LiDAR processing software. The data was checked for completeness of coverage. The relative fit of data in the overlap between strips was also checked.
The height accuracy of the ground classified LiDAR points was checked using open land cover survey check site data collected by Sounds Surveying Ltd. This was done by calculating height differences statistics between a TIN of the LiDAR ground points and the checkpoints. The standard deviation statistic is 0.047-0.048 m; a RMS of 0.047-0.048 m and the average difference is -0.02-0.00 m. LiDAR is relative to the control check points.
The positional accuracy of the LiDAR data has been checked by overlaying Sounds Surveying Ltd surveyed data over the LiDAR data displayed coded by intensity. The data was found to fit well in position.
The point cloud data was then classified with TerraSolid LiDAR processing software into ground and above ground returns using automated routines tailored to the project land cover and terrain.
All product deliverables supplied in terms of NZTM map projection and NZVD2016 vertical datum.
Classification of the point cloud follows the classification scheme below:
1 - Unclassified
2 - Ground
3 - Low Vegetation
4 - Medium Vegetation
5 - High Vegetation
6 - Buildings
7 - Low Noise
9 - Water
18 - High Noise
Lakes and large rivers were hydroflattened in the Bare Earth Digital Elevation Model.
The deliverables to LINZ were:
1m gridded bare earth digital elevation model (DEM)
1m gridded digital surface model (DSM)
Classified point cloud
- Hierarchy level
- Dataset
- Other
-
dataset
Reference System Information
- Reference system identifier
- 2193
Metadata constraints
- Use limitation
-
Copyright of this work is owned by Toitū Te Whenua Land Information New Zealand
© LINZ
- Use constraints
- Copyright
Metadata constraints
- Use limitation
-
Released by Toitū Te Whenua Land Information New Zealand under Creative Commons Attribution 4.0 International (CC BY 4.0) with:
Following Attribution:
"Sourced from the LINZ Data Service and licensed for reuse under CC BY 4.0"
For details see https://www.linz.govt.nz/data/licensing-and-using-data/attributing-linz-data
- Use constraints
- License
Metadata
- Metadata identifier
- e4c02699-6384-e477-4d0c-f47f328db0c7
- Language
- English
- Character encoding
- UTF8
- Contact
-
Role Organisation Electronic mail address Point of contact Toitū Te Whenua Land Information New Zealand
Type of resource
- Resource type
- Dataset
- Name
-
dataset
- Date info (Revision)
- 2023-03-03
Metadata standard
- Title
-
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
- Edition
-
1.1