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Northland 0.1m Urban Aerial Photos Index Tiles (2014-15)

Index Tiles ONLY, for actual orthophotos see layer [Northland 0.1m Urban Aerial Photos (2014-15)]( http://data.linz.govt.nz/layer/3399 )


Orthophotography in the Northland Region taken in the flying season (summer period) 2014 - 2015. Coverage is of urban areas with the Far North district, The Kaipara district, and Whanagei City council areas.


Imagery was captured for the ‘Northland Aerial Imagery Consortium (NAIC)’ by Aerial Surveys Ltd, Unit A1, 8 Saturn Place, Albany,0632, New Zealand.


Data comprises:

•6,550 ortho-rectified RGB GeoTIFF images in NZTM projection, tiled into the LINZ Standard 1:500 tile layout

•Tile layout in NZTM projection containing relevant information.


The supplied imagery is in terms of New Zealand Transverse Mercator (NZTM) map projection. The products are tiled into NZTopo50 1:500 tiles. Please refer to the supplied tile layout shape file for specific details, naming conventions, etc.


Imagery supplied as 10cm pixel resolution (0.1m GSD), 3-band (RGB) uncompressed GeoTIFF. The final spatial accuracy is ±0.15m @ 95% confidence level in clear open spaces (2 sigma) over area of interest.

Simple

Identification info

Date (Creation)
2015
Status
Completed
Point of contact
Role Organisation Electronic mail address
Point of contact

LINZ - Land Information New Zealand

info@linz.govt.nz

Spatial representation type
Grid

Spatial resolution

Equivalent scale

Denominator
1000
Topic category
  • Imagery base maps earth cover

Extent

N
S
E
W


Resource format

Title

*.xml

Date
Edition

Unknown

Resource constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Access constraints
Copyright

Resource constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Access constraints
License

Resource constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Use constraints
Copyright

Resource constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Use constraints
License

Resource constraints

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/53394-northland-01m-urban-aerial-photos-index-tiles-2014-15/

Resource lineage

Statement

Data Acquisition:

The aerial photography for this project was captured within the 2014/15 flying season (September

2014 – April 2015) on 10, 25, 26 October 2014, 09, 10, 11 November 2014, 04 January 2015, 03, 04 May 2015.


All photography was captured using Vexcel's digital UCLp and UCE cameras with flying height of UCLp 3829ft and UCE 6312ft.


Data Processing:

All aspects of the data processing from imagery processing to DTM creation and ortho production

and product deliverables was undertaken in-house by Aerial Surveys and Cyient staff.


Map Projection:

All spatial data for this project provided in terms of New Zealand Transverse Mercator (NZTM) map

projection. The datum is New Zealand Geodetic Datum 2000. The height datum is orthometric One

Tree Point 1946 (sea level).


Image Processing and Aerial Triangulation:

All imagery has gone through QA checks ensuring there is no cloud cover and cloud shadow. During

aerial acquisition the aircraft on-board GPS navigation data and ground base station data collected

and post processed. Imagery processed to level 3 and checked for colour correctness/radiometry and

even tonal balance across each project area. The aerial triangulation brings together the GPS data

and imagery using a two part process which stitches the imagery together using tie point matching

for the relative orientation phase and observing ground control points for the absolute orientation

phase. LINZ control, 8th order horizontal and 4th order vertical and other existing control from Aerial

Surveys control data base were used to strengthen the block adjustment or as independent checks on position during final QA of the ortho imagery. A final report is generated to check RMSE values are

within specification.


DTM Creation:

The DTM creation for the urban areas was collected from stereo imagery using photogrammetric

techniques, largely automated pixel matching and auto-correlation process that creates mass points

of the terrain surface with further manual editing to remove points on water bodies and extensive

breaklines added around water bodies and along all ridges, valleys and areas of steep terrain change,

such as kerbs, retaining walls, drains. In areas of dense vegetation form lines are collected. The final

DTM took the form of breaklines and mass points. A Triangulated Irregular Network (TIN) was then

created and used for the ortho-rectification process.

DTM Accuracy: ±0.2m @ 95% confidence level in clear open areas (2 sigma)


RGB and Ortho Rectification Process: Ortho rectification is the process of removing (from the image) the effects of camera tip/tilt and displacement caused by terrain relief. During this process each frame is 'draped' over the terrain model and the photograph then becomes 'scaled' and 'levelled' in terms of true ground coordinates. The generation of seamlines between frames follow natural physical features such as ridges, valleys, roads and rivers. The seamlines are used for the final ortho mosaic that stitches the imagery together using feather mosaicking techniques. The ortho imagery is then extracted aligned to LINZ 1:500 sheet tile layout.

Hierarchy level
Dataset
Other

dataset

Reference System Information

Reference system identifier
2193

Metadata constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Access constraints
Copyright

Metadata constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Access constraints
License

Metadata constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Use constraints
Copyright

Metadata constraints

Use limitation

Released under Creative Commons By

Creative Commons Attribution 3.0 New Zealand

Link: http://data.linz.govt.nz/license/attribution-3-0-new-zealand/


Attribution Required for Copies:

"Copyright in this work is owned by Northland Aerial Imagery Consortium (NAIC)."


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Northland Aerial Imagery Consortium (NAIC)"

Use constraints
License

Metadata

Metadata identifier
f0ba9896-1cfc-c4ef-c304-8ca47ff6c212

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

LINZ - Land Information New Zealand

info@linz.govt.nz

Type of resource

Resource type
Dataset
Name

dataset

Date info (Revision)
2016-05-16

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



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