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Northland 0.4m Rural Aerial Photos (2014-16)

Orthophotography in the Northland Region taken in the flying season (summer period) 2014 - 2016. Coverage is of all areas areas within the Far North district, The Kaipara district, Whanagei City, Northland Regional 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:

•2,465 ortho-rectified RGB GeoTIFF images in NZTM projection, tiled into the LINZ Standard 1:5,000 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 1:5,000 tiles. Please refer to the supplied tile layout shape file for specific details, naming conventions, etc.


Imagery supplied as 40cm pixel resolution (0.4m GSD), 3-band (RGB) uncompressed GeoTIFF. The final spatial accuracy is +/-0.6m @ 67% confidence level in clear open spaces


Index tiles for this dataset are available as layer [Northland 0.4m Rural Aerial Photos Index Tiles (2014-16)]( http://data.linz.govt.nz/layer/88094 )

Simple

Identification info

Date (Creation)
2016
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
5000
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 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 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 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 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 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 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 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 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
Language
English
Character encoding
UTF8

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/88131-northland-04m-rural-aerial-photos-2014-2016/

Resource lineage

Statement

Data Acquisition:

The aerial photography for this project was captured within the 2014/15/16 flying seasons between

November 2014 and July 2016.


All photography was captured using Vexcel's digital cameras and flown at:

-0.3m GSD with the UCE: 18,934ft (5,771m) flying height Camera Lens: 100mm

-0.4m GSD with the UCLp: 15,398ft (4,693m) flying height Camera Lens: 70mm


Sun Angle

Minimum of +35 degrees


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.


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 1964 (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 rural 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 minimal

breaklines collected to ensure gross errors were corrected and the DTM generally reflects the terrain

surface. The final DTM took the form of mass points only with minimal breaklines, suitable for the

ortho rectification process.

DTM-ortho Accuracy: ±0.8m @ 68% confidence level in clear open areas (1 sigma)


RGB and RGBI 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 1:5,000

sheet tile layout.

The ortho imagery was processed to RGBI to ensure a consistent dataset is maintained for the RGB

and RGBI ortho tiles including the same seamlines. Minimal colour adjustment was undertaken in the

RGB, generally over water areas and along coastal foreshore for colour matching and to minimise

glare.


Peripheral Imagery

Because the flight planning incorporates capture of an area larger than the target this creates

additional imagery that can be ortho rectified and supplied. The peripheral ortho imagery in essence

is the supply to full image extents., but can include partial tiles. The peripheral image tiles contain

pixels with null value (the area where there is no imagery). The null value areas have been assigned a

pixel value of 255 in the Geotiff for all three bands. The null value can then be treated as transparent

within a GIS environment.


DTM Source: Outside client's area of interest auto correlated DTM points were generated from the

stereo imagery and used to hold the ortho imagery in place.

Peripheral Ortho Spatial Accuracy: ±0.4m @ 1 sigma

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 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 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 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 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 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 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 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
2fca5fe8-cc09-786d-2648-2c2cfe1b8991

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)
2017-09-12

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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