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Standard Orthorectified Imagery


Metadata
File Identifier: {C1A0CA59-6554-465C-9119-787D32E5A1BA}
Metadata Language: eng
Character Set: utf8
Resource Type: Dataset
Responsible Party:
Individual Name: withheld
Organisation Name: Land and Property Information
Position Name: Manager, Spatial Data Services
Role: Point Of Contact
Contact Info:
Delivery Point: 346 Panorama Ave
City: Bathurst
Administrative Area: NSW
Postal Code: 2795
Country: Australia
E-Mail Address: sds.services@lpi.nsw.gov.au
Metadata Date: 2011-05-30
Metadata Standard Name: NSW Metadata Profile
Metadata Standard Version: 1.1
Data Identification
Abstract: This data series is a collection of mosaics covering the state's standard 1:100,000 scale map areas, which are approximately 50km by 50km in size. It was created by ortho-rectifying, colour matching and joining overlapping image strips captured with multiple flight lines over the project area using a Leica ADS40 or ADS80 airborne digital sensor. This product can be ordered as a 3band RGB or 4band BGRN [limited availability] image mosaic using the Blue, Green, and Red. This product has a ground sampling distance (GSD) of 50cm. The aerial imagery used for the creation of this product was flown between the dates shown in the “Additional Extent – Temporal” field of this metadata statement. The mosaic was created on the date shown in the “Date of Creation” field of this metadata statement. The mosaic is supplied as an Enhanced Compressed Wavelet (.ecw) file which is approximately 10 gigabytes in size.
Purpose: This product has been produced to identify visible features and terrain for Local Government and Land and Property Information (LPI)’s standard mapping programs. This product is also used on a whole of government basis as a visible record of the landscape at a given point in time, allowing for comparative analysis to be carried out over different epochs.
Language: eng
Status: completed
Citation:
Title: Standard Orthorectified Imagery
Date:
Date: 2013-03-07
Date Type: Creation Date
Date:
Date: 2013-03-07
Date Type: Revision Date
Date:
Date: 2013-03-07
Date Type:
Point Of Contact:
Individual Name: Manager, Spatial Data Services
Organisation Name: Land and Property Information
Position Name: Manager, Spatial Data Services
Role: Point Of Contact
Contact Info:
Voice:
Fax:
Delivery Point: 346 Panorama Ave
City: Bathurst
Administrative Area: NSW
Postal Code: 2795
Country: Australia
E-Mail Address: sds.services@lpi.nsw.gov.au
Resolution: 50cm
Topic Category: Imagery and Base Maps
Keyword Collection:
Keyword: LAND-Topography
Keyword: LAND-Cover
Keyword: PHOTOGRAPHY-AND-IMAGERY
Keyword: PHOTOGRAPHY-AND-IMAGERY-Aerial
Keyword: PHOTOGRAPHY-AND-IMAGERY-Remote-Sensing
Associated Thesaurus: ANZLIC Search Words
Temporal Extent:
Instant Date: 2007-01-01
Spatial Extent:
West Bounding Longitude: 140
East Bounding Longitude: 154
North Bounding Latitude: -28
South Bounding Latitude: -38
Legal Constraints:
Use Constraints: Copyright
Use Limitation: Unless stated in the licence, the Data as described by this metadata statement, and copyright in the Data, always remains the property of the Crown in right of New South Wales as managed by Land and Property Information (LPI).
Legal Constraints:
Use Constraints: License
Use Limitation: Acquisition of this data is subject to the customer entering into Products and Services Reciprocal Exchange Licence or a Users Licence for LPI’s Digital Data Files (short Version) with the LPI.
Legal Constraints:
Use Constraints: Intellectual Property Rights
Use Limitation: LPI creates and manages intellectual property (IP) for this data for the Crown in right of NSW. LPI has the right to licence the use of this IP for an appropriate fee. Shared IP rights may reside in the data and in this circumstance specific terms and conditions will be included in the data licence.
Legal Constraints:
Use Constraints:
Use Limitation: Unless otherwise stated in the licence;The Data is licensed for the Licensee’s ordinary business use only, excluding any commercial exploitation. Hard copies may be produced from the Data for the Licensee’s own use, but not for resale, either in combination with other data or not, without the prior written consent of the Licensor.This licence is granted on the express undertaking that the Data or any part of the Data will not be copied, lent, resold, altered, decompiled, disassembled or otherwise disposed of without the written permission of the Licensor.The Data may not be copied (except to create backup copies for the Licensee’s exclusive use), or manipulated in any way with the intention of reconstituting them so that they can be used in any software package, other than that of the Licensee. The copyright notices appearing on the Data may not be removed or obscured, and must be displayed on any backup copies created by the Licensee.
Security Constraints:
Classification: unclassified
Distribution
Transfer Options:
URL: http://maps.six.nsw.gov.au
Function:
Distributor:
Distributor Format:
Format Name: ecw
Format Version: Varies
Specification: BandType:RGB,Compression Ratio:5 or 10
Distributor Contact:
Individual Name: Withheld
Organisation Name: Land and Property Information
Position Name: Account Manager
Role: Distributor
Contact Info:
Voice:
Fax:
Delivery Point: 346 Panorama Ave
City: Bathurst
Administrative Area: NSW
Postal Code: 2795
Country: Australia
E-Mail Address: sds.imagery@lpi.nsw.gov.au
Quality
Scope: Series
Lineage: LPI’s imagery has been captured using an ADS sensor (ADS40 or ADS80 as specified in each mosaic) and created using a documented process. The imagery capture program initially started in 2007 with ADS40 sensor. The sensor was upgraded to ADS80 in 2012. Depending on the processing and surface model used, positional accuracy of each image varies. The capture date, flight line information of each image can be found in respective individual metadata. The image capture, processing and delivery are consistent with well accepted digital image processing techniques (Leica Geosystems, 2009; 2010);1) A flight plan is created over the applicable mapping area, ensuring that the correct ground sampling distance (GSD) and run overlaps are maintained. The project area is then flown using the flight plan. 2) Raw imagery from the flight is downloaded from the sensor’s mass memory unit along with related global navigation satellite system (GNSS) data and inertial measurement unit (IMU) data. The downloaded raw image strips are geo-referenced using the associated GNSS and IMU data as well as base station or precise point positioning data. This geo-referenced imagery is referred to as level 0 imagery. 3) As the imagery data is captured at 12bits/band (4096 brightness values per band) and processed to 8bits/band (256 brightness values per band), a colour profile is created for the imagery by stretching and balancing the colour values to visually match the colours of features on the ground. This colour profile is then used in the subsequent processing levels of imagery for the project area. 4) Aerial triangulation software is used to run an automatic point measuring process. This process finds common image points on overlapping image strips. These points, along with surveyed control points and virtual photo centres (orientation fixes), are used by the aerial triangulation process to self-calibrate the sensor and improve the geo-referencing accuracy of the image strips. 5) Ortho-rectified imagery (referred to as level 2 imagery) is created by rectifying the image strips to a digital surface model of the project area. Colour difference between overlapping image strips are autocorrected to balance the colours across the entire project area. 6) The image strips of adjacent flight-lines are joined together at seam-lines along zones of similar contrast and colour and “feathering” is used to minimise any differences. As such, neighbouring pixels along these joins will have been captured at different times, which should be taken into account if this product is used for temporal analysis. To establish the location of these joins, a seam-line dataset is available for this mosaic upon request. 7) The image strips are joined and extracted into map partition modules. At this stage, the modules are Geo-TIFF files containing coordinate information, which is also stored in accompanying ERS files. These modules are combined and compressed into an .ecw file. A target compression ratio of 10:1 or 5:1 is used to create the ECW file with negligible pixel level change. LPI digital information is stored and processed within data centres certified to the ISO/IEC 27001 standard for Information Security Management in accordance with the Privacy and Personal Information Protection Act 1998, the Privacy Code of Practice (General) 2003, the Privacy and Personal Information Protection Regulation 2005 and the State Records Act 1998.
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