Canterbury - Christchurch and Selwyn LiDAR Index Tiles (2015)
This layer contains the index tiles for LiDAR data from the Christchurch and Selwyn areas captured in 2015.
The DEM is available as layer [Canterbury - Christchurch and Selwyn LiDAR 1m DEM (2015)]( http://data.linz.govt.nz/layer/3587 ).
The DSM is available as layer [Canterbury - Christchurch and Selwyn LiDAR 1m DSM (2015)]( http://data.linz.govt.nz/layer/3588 ).
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 Canterbury Regional Council by AAM between 5 October and 7 November 2015. The datasets were generated by AAM and their subcontractors. The survey area includes Christchurch City and parts of the Selwyn district. Data management and distribution is by Toitū Te Whenua Land Information New Zealand.
Data comprises:
•DEM: tif or asc tiles in NZTM2000 projection, tiled into 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
Planned pulse density is 4 pulses/square metre.
Vertical accuracy specification is +/- 0.20m (95%).
Horizontal accuracy specification is +/- 1.00m (95%).
Vertical datum is NZVD2016.
Simple
Identification info
- Date (Creation)
- 2015-11-07
- Date (Publication)
- 2017-03
- Status
- Completed
- Point of contact
-
Role Organisation Electronic mail address Point of contact Toitū Te Whenua Land Information New Zealand
- Spatial representation type
- Grid
Spatial resolution
Equivalent scale
- Denominator
- 1000
- Topic category
-
- Elevation
- Imagery base maps earth cover
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
Extent
))
Resource format
- Title
-
*.xml
- Date
- Edition
-
Unknown
- ANZLIC Jurisdictions
-
-
New Zealand
-
- ANZLIC Search Words
-
-
LAND-Topography
-
LAND-Cover
-
Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Access constraints
- Copyright
Resource constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Access constraints
- License
Resource constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Use constraints
- Copyright
Resource constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- 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 in October and November 2015, using AAM's Riegl LMS-Q1560 and Leica ALS60 LiDAR systems.
Survey Specification:
Selwyn:
Device Name Q1560
Half Scan Angle 29 degrees
Laser Pulse Rate 800 kHz
Overlap Percentage 20%
Average Point Spacing 3.1 pts/m2
Laser Footprint 0.47m
Christchurch:
Device Name: ALS60
Half Scan Angle: 12.5 degrees
Laser Pulse Rate: 145 kHz
Overlap Percentage: 20%
Minimum Point Density: 4 pts/m2
Laser Return Types: 1st, 2nd, 3rd and last
Laser Intensity All returns
File Format: ESRI ASCII Grid, ESRI Shapefile, LAS 1.2
Horizontal Datum: NZGD2000
Vertical Datum: NZVD2016
Map Projection: NZTM
Vertical Accuracy Specification: ±0.10m Standard Error (68% confidence level or 1 sigma)
Horizontal Accuracy Specification: ±0.50m Standard Error (68% confidence level or 1 sigma)
Data processing:
Laser strikes were classified into ground and non-ground points using a single algorithm across
the project area. Manual checking and editing of the data classification further improved the
quality of the terrain model.
Further Processing: ArcGIS 10.1 Terrain and Surface Grids were derived using the Natural
Neighbor interpolation. This method uses the closest triangles and applies weights to the
proportionate areas from the grid cell centroid to interpolate the value. It uses known elevation
data, it does not make any predictions regarding the surface and accurately depicts existing
troughs and peaks in the data and supports irregular point spacing, which suits the nature
LiDAR data.
GPS base station support was sourced from Global Surveys CORS
operating in Christchurch. The ground check points were field surveyed by Sounds Surveying
Limited, these allowed an independent assessment of the accuracy of the ALS data..
All product deliverables were initially supplied in terms of NZTM and Lyttelton 1937 height datum.
Classification of the point cloud followed the classification scheme below:
0 - Created, never classified
1 - Unclassified
2 - Ground
7 - Low/high points
9 - Water
Re-processing:
In 2016 the data was reprocessed by AAM for LINZ relative to the NZVD2016 vertical datum, and supplied as 1:1000 nominal scale (2500 720m high x 480m wide subtiles per full NZ Topo50 sheet). Lakes and 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
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Access constraints
- Copyright
Metadata constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Access constraints
- License
Metadata constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Use constraints
- Copyright
Metadata constraints
- Use limitation
-
Released under Creative Commons Attribution 4.0 International
Creative Commons Attribution 4.0 International
Link: http://data.linz.govt.nz/license/attribution-4-0-international/
Attribution Required for Copies:
"Copyright in this work is owned by Environment Canterbury Regional Council"
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Environment Canterbury Regional Council"
- Use constraints
- License
Metadata
- Metadata identifier
- 1a517148-ed39-7d72-4991-f9028da8a374
- 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)
- 2017-03-21
Metadata standard
- Title
-
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
- Edition
-
1.1