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This dataset was first added to LINZ Data Service on 20 Sep 2017.
a1d2fd75-e159-9142-deee-00570ab11d19
eng
utf8
dataset
dataset
Toitū Te Whenua Land Information New Zealand
National Imagery Manager
04 4600110
155 The Terrace
Wellington
6145
New Zealand
customersupport@linz.govt.nz
pointOfContact
2017-09-12
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
1.1
2193
Hamilton 0.1m Urban Aerial Photos (2016-17)
Orthophotography over Hamilton City taken in the flying season (summer period) 2016 -17.
Imagery was captured for the ‘Hamilton City Council’ by Aerial Surveys Ltd, Unit A1, 8 Saturn Place, Albany,0632, New Zealand.
Data comprises:
•492 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 ±0.2 m @ 95% confidence level in clear open spaces.
Index tiles for this dataset are available as layer [Hamilton 0.1m Urban Aerial Photos Index Tiles (2016-17)](http://data.linz.govt.nz/layer/88100)
completed
Toitū Te Whenua Land Information New Zealand
National Imagery Manager
04 4600110
155 The Terrace
Wellington
6145
New Zealand
customersupport@linz.govt.nz
pointOfContact
*.xml
Unknown
unclassified
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 Hamilton City Council."
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
copyright
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
license
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
copyright
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
license
grid
1000
eng
utf8
imageryBaseMapsEarthCover
https://data.linz.govt.nz/layer/88132-hamilton-01m-urban-aerial-photos-2016-2017/
dataset
dataset
Data Acquisition:
The aerial photography for this project was captured within the 2014/15 flying season (September
2014 – April 2015) on the following date:
20 March 2015.
All photography was captured using Vexcel's digital UCLp camera and flown at:
0.10m GSD: 3850ft (1173m) flying height
Camera Lens: 70mm
Sun Angle
Minimum of +40 degrees
Urban Building Displacement Specification
Urban 0.10m GSD imagery – using the UCLp camera and by flying with 60% forward overlap and
with 30% sidelap (standard stereo coverage), maximum 1.1m building lean per 3m height within the
image model area.
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 staff.
Map Projection
All spatial data for this project provided in terms of New Zealand Transverse Mercator 2000 map
projection (NZTM2000) . The datum is New Zealand Geodetic Datum 2000 (NZGD2000). The height
datum is orthometric Auckland 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. A final report is generated to check RMSE values are within specification.
DTM Source:
The digital terrain model used for this project was derived from 2008 and 2010 LiDAR
DTM data. Outside the existing data we have collected a new DTM from the stereo imagery. The
DTM data is merged together seamlessly and accuracy is checked to meet the ortho imagery
specification.
RGB Ortho Specification
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
1:1000 sheet tile layout.
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
copyright
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
license
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
copyright
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 Hamilton City Council."
Attribution Required for Derivative works:
"Copyright in the underlying dataset from which this work has been derived is owned by Hamilton City Council."
license