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Nelson 0.5m Rural Aerial Photos Index Tiles (2008 - 2009)

Index Tiles ONLY, for actual orthophotos see layer [Nelson 0.5m Rural Aerial Photos (2008 - 2009)]( http://data.linz.govt.nz/layer/1777 )


Orthophotography for the Nelson region taken in the flying season (summer period) of 2008-2009. Coverage encompassed the entire Nelson City councils area.


Imagery was captured for the ‘Nelson City Council’ by NZ Aerial Mapping Ltd, 208 Warren Street, PO Box 6, Hastings 4156, New Zealand


Data has subsequently been provided to LINZ and this comprises:

• 80 x 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 50cm pixel resolution (0.5m GSD), 3-band (RGB) uncompressed GeoTIFF. The final spatial accuracy is +/-3.0m (@ 90% confidence).

Simple

Identification info

Date (Creation)
2009
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
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 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 NZ Aerial Mapping Limited, and is used under licence by Land Information New Zealand."

Attribution Required for


Derivative works

"Copyright in the underlying dataset from which this work has been derived is owned by NZ Aerial Mapping Limited, and is used under licence by Land Information New Zealand.”

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 NZ Aerial Mapping Limited, and is used under licence by Land Information New Zealand."


Attribution Required for


Derivative works

"Copyright in the underlying dataset from which this work has been derived is owned by NZ Aerial Mapping Limited, and is used under licence by Land Information New Zealand.”

Use constraints
Copyright

Resource constraints

Use limitation

Released under Creative Commons By.

Use constraints
License
Language
English
Character encoding
UTF8

Distribution Information

OnLine resource

https://data.linz.govt.nz/layer/51897-nelson-05m-rural-aerial-photos-index-tiles-2008-2009/

Resource lineage

Statement

Data Acquisition:

The NZAM numbers pertaining to this photographic survey is Sn50790P.

Digital imagery was collected in Jan 2009 using NZ Aerial Mapping’s Microsoft UCX & UCXp large-format digital cameras. The imagery was collected flying between 18,000’ – 22,000’ above mean ground, using 60% forward & 30% minimum overlaps. Collected imagery was cloud-free, sun angle of not less than 35-degrees.


Data Processing:

Image Processing was undertaken following QA of the flown photography. Initial check’s included ensuring there is was no evidence of cloud, cloud-shadow, smoke, haze or other issues which may cause problems during downstream processing. Imagery was then converted from ‘Level O’ (readable only in the proprietary image software) into ‘Level 3’ - raw, uncorrected RGB imagery. Aerial Triangulation (AT) followed. This process relates one frame to the next, then one run to the next until a continuous ‘parallax-free’ block of photography is created. Introduction at this point of the surveyed ground control helps ‘tie’ the block of photography to true ground coordinates from which mapping then commences.

NZAM use UltraMap v2.3 & ORIMA software for the image processing & AT components. ~26 x photo-identifiable detail points have been surveyed, post-photography, via Vince Belgrave of Sounds Surveying Ltd, Picton. Trigs and other existing control from previous projects were used to strengthen the block adjustment or as independent checks on position during final QA of the

orthos.

DTM creation was undertaken by NZAM’s Indian-based subcontractors – Genesys International Corporation once AT was complete. Each pair of overlapping photographs was viewed in a stereo environment and a terrain model created for that portion of the earth’s surface. Pixel matching & auto-correlation techniques were used - as they are a quick & efficient method of achieving the desired result. Manual checks by stereo compilation staff were done to ensure gross errors were corrected & the DTM accurately reflected the terrain surface. Final DTM’s took the form of breaklines (along ridges, valleys & sharp terrain changes) and masspoints (individual xyz points) to infill & add density to the ground model. A Triangulated Irregular Network (TIN) was then created & used for the ortho-rectification process. Ortho-rectification is the process of removing (from the image) the effects of camera tip / tilt & displacement caused by terrain relief. During this process each frame is ‘draped’ over the terrain model, the photograph then becomes ‘scaled’ & ‘levelled’ and in terms of true ground coordinates. Mosaic lines between frames were created, edited (normally along physical features such as roads, rivers, ridges or similar geographical features) & used during the final ‘stitching’ of frames together. Tiling was then done into the agreed tile layout & rectified imagery output in the appropriate formats.

Hierarchy level
Dataset
Other

dataset

Reference System Information

Reference system identifier
2193

Metadata constraints

Use limitation

Copyright 2014 Crown copyright (c)


Land Information New Zealand and the New Zealand Government.

All rights reserved.

Use constraints
Copyright

Metadata constraints

Use limitation

Released under Creative Commons By.

Use constraints
License

Metadata

Metadata identifier
317d622e-4611-3723-f0bc-ee1c2d82392a

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)
2014-04-16

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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