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

Index Tiles ONLY, for actual orthophotos see layer [Wairoa 0.1m Urban Aerial Photos (2014-15)]( http://data.linz.govt.nz/layer/3400 )


Orthophotography in the Wairoa district taken in the flying season (summer period) 2014 - 2015. Coverage is of urban areas with the Wairoa District Council area.


Imagery was captured for the ‘Wairoa District Council’ by Aerial Surveys Ltd, Unit A1, 8 Saturn Place, Albany,0632, New Zealand.


Data comprises:

•514 ortho-rectified RGB GeoTIFF images in NZTM projection, tiled into the LINZ Standard 1:1,000 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 1:1,000 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 ±0.2m @ 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

Classification
Unclassified

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

Use constraints
License
Language
English
Character encoding
UTF8

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/53393-wairoa-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 22 December 2014 and 5 January 2015.


All photography was captured using Vexcel's digital UCLp camera and flown at 3850ft (1173m) flying height.


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 or 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

Napier 1962 (sea level). The products are tiled into NZTopo50 map sheet tiles as noted below.


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, 9th order horizontal and 3rd 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 digital terrain model used for this project was derived from LiDAR DTM data flown in 2003. The

DTM was then updated in any areas of change. Outside the existing data 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 breaklines added around water bodies

and along all ridges, valleys and areas of steep terrain change, such 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 orthorectification

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 aligned to LINZ 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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

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 Wairoa District Council"


Attribution Required for Derivative works:

"Copyright in the underlying dataset from which this work has been derived is owned by Wairoa District Council"

Use constraints
License

Metadata

Metadata identifier
7eab48b6-482a-ec08-ca82-3c8d6fe0e804

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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