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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

customersupport@linz.govt.nz

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

N
S
E
W


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

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/53578-canterbury-christchurch-and-selwyn-lidar-index-tiles-2015/

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

customersupport@linz.govt.nz

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

 
 

Spatial extent

N
S
E
W


Keywords

ANZLIC Jurisdictions
New Zealand
ANZLIC Search Words
LAND-Cover LAND-Topography

Provided by

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


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