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Stewart Island / Rakiura - Oban LiDAR Index Tiles (2021)

This layer contains the index tiles for LiDAR data for Stewart Island / Rakiura and includes Oban and the surrounding area captured in 2021.


- The DEM is available as layer [Stewart Island / Rakiura - Oban LiDAR 1m DEM (2021)]( https://data.linz.govt.nz/layer/107474/ )


- The DSM is available as layer [Stewart Island / Rakiura - Oban LiDAR 1m DSM (2021)]( https://data.linz.govt.nz/layer/107475/ )


- The LAS point cloud and vendor project reports are available from [OpenTopography]( https://portal.opentopography.org/datasets?loc=New%20Zealand )


LiDAR was captured for Environment Southland by ASL Ltd on 3 September 2021. 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)
2021-09-03
Status
Completed
Point of contact
Role Organisation Electronic mail address
Point of contact

Toitū Te Whenua Land Information New Zealand

customersupport@linz.govt.nz

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

N
S
E
W


Maintenance and update frequency
Not planned

Resource format

Title

*.xml

Date
Edition

Unknown

ANZLIC Jurisdictions
  • New Zealand

Resource constraints

Use limitation

Copyright in this work is owned by Environment Southland

© Environment Southland

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 Environment Southland, 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

Resource constraints

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/107476-stewart-island-rakiura-oban-lidar-index-tiles-2021/

Resource lineage

Statement

Data Acquisition:


Airborne Laser Scanner (ALS) data was acquired from a fixed wing aircraft on 3 September 2021, using ASL's Optech Galaxy Prime LiDAR system.


Survey Specification:


- Scanner: Optech Galaxy Prime

- Flying height: 2850 m AMGL

- Scan angle: 25 degrees

- Pulse rate: 400 kHz

- Swath overlap: 30%

- Swath points per M^2: 4.17 pts per sq m.


Data Processing:


The LiDAR sensor positioning and orientation (POS) was determined using the collected GPS/IMU datasets and Applanix POSPac software.


Base Station Positions: PPRTX


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 0.02m; a RMS of0.02m and the average difference is 0m. LiDAR is relative to the control check points.


The positional accuracy of the LiDAR data has been checked by overlaying Sounds Surveying Ltdsurveyed 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 a sparse triangular irregular network (TIN) from the supplied LiDAR points and then classified according to required classes by using automatic iterative process followed by manual correction.Terrascan’s inbuilt macros with different parameters were used to classify low points, ground points, buildings, temporary features and finally vegetation.


All product deliverables supplied in terms of NZTM map projection and NZVD2016 vertical datum.


Classification of the point cloud followed the classifications 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


The Digital Elevation (DEM) was derived using a point to TIN and TIN to Raster process, using a Natural Neighbour interpolation. Hydro flattening was performed as per part 7 of PGF version New Zealand National Aerial Lidar Base Specification Jan 2020.


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
e77efcab-5bc5-9226-cd8e-04cbea7fb26d

Language
English
Character encoding
UTF8
Contact
Role Organisation Electronic mail address
Point of contact

Toitū Te Whenua Land Information New Zealand

customersupport@linz.govt.nz

Type of resource

Resource type
Dataset
Name

dataset

Date info (Revision)
2022-05-09

Metadata standard

Title

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Edition

1.1

 
 

Spatial extent

N
S
E
W


Keywords

ANZLIC Jurisdictions
New Zealand

Provided by

Access to the catalogue
Read here the full details and access to the data.


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