Data Identification

Abstract:

The rapid response image covers the mapsheet area of Hawkesbury-Nepean Floods Eastern Sector. It has been produced as part of Spatial Services Emergency Response Imagery Program. The image was created by ortho-rectifying and mosaicing data from flight lines over the project area using a Leica ADS80 airborne digital sensor. An ECW product is created as a Standard Colour (RGB) Orthorectifed Mosaic file as well as a Near-Infrared(NIR), Red, Green Orthorectifed Mosaic file and has a spatial resolution of 25 cm. The file size depends on the project area, compression ratio and the number of bands that exist in the image. The image was captured on 24 March 2021.

Purpose:

This product has been produced to identify visible features and terrain for emergency management. 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.

Notes:

• All mosaics are spatially correct to GDA2020 and projected as GDA2020 MGA Zone 56 regardless of what is stated in any software or auxiliary file(s).
• Spatial Services is aware that some of these files will display the projection as WGS84 or "Extended Datum". This is due to the processing methodology Spatial Services must use with current software to produce GDA2020. Spatial Services is working to resolve this issue.
• As a rapid response product, this dataset meets the standards and accuracy specifications outlined in 'Imagery Products Data Specification and Description @ December 2016' for this type product.
• All auxiliary files must be maintained with the image files at all times.

Data file name:

Hawkesbury-Nepean_Floods_Eastern_Sector_2021_03_25cm.ecw (depricated), Hawkesbury-Nepean_Floods_Eastern_Sector_2021_03_25cm_v2.ecw, Hawkesbury-Nepean_Floods_Eastern_Sector_2021_03_25cm_v2_NRG.ecw

Key words:

Land-Topography,Land Cover, Photography and Imagery, Photography and Imagery-Aerial,Photography and Imagery-Remote-Sensing

Topic Category:

location, imageryBaseMapsEarthCover

Spatial Extent

West Bounding Longitude: 150.83148451915883

East Bounding Longitude: 151.13034629778213

South Bounding Latitude: -33.90963580635417

North Bounding Latitude: -33.219719690429365

Spatial Reference

EPSG Code: 7856

Horizontal Datum: Geocentric Datum of Australia (GDA) 2020

MGA Zone: 56

No control was used in the production of this rapid response product.

Project Temporal Extent (for tile extent see Data Quality)

Data Capture Start Date:24 March 2021

Data Capture End Date: 24 March 2021

Distribution Information

Data Format: ECW (Enhanced Compressed Wavelet)

Data Quality

Capture
Acquisition Start Date:	24 March 2021
Acquisition End Date:	24 March 2021
Flying Height (AGL):	8000ft
Number of Project Flight Lines:	15

Product
Horizontal Datum:	Geocentric Datum of Australia (GDA) 2020
Projection:	Map Grid of Australia (MGA), Zone 56
Description of Aerotriangulation Process Used:	N/A
Spatial Accuracy Horizontal:	N/A
Resolution:	25cm
Surface Model:	Semi-Global Match DTM
Calibration certification (Manufacturer/Cert. Company):	Issued by Leica Geosystems
Limitations of the Data:	Accuracy specifications (95% CI) meet ICSM Guidelines for Digital Elevation data
Distribution Format:	ECW (Enhanced Compressed Wavelet)
Product Type:	Standard Colour Orthorectified Mosaic 3 Band False Orthorectified Mosaic
Bands:	R,G,B NIR,R,G
Compression Rate:	5 :1 for ECW
Bits per pixel:	8
Processing/Derivation Lineage:	As per Spatial Services Product Specification

Sensor
Device Name:	Leica ADS80
Camera Head:	SH82
Type:	Flood
Dynamic Range:	12 bit
Resolution A/D Converter:	16 bit
Data Channel:	16 bit
Focal length:	62.7mm
Data Compression Factor:	~2.5x and ~3.6x
Radiometric Resolution of compressed data:	10 bit and 12 bit
Data Normalization modes:	Non-linear
Recording Interval Per Line (sensor per line):	>= 1msec
Spectral Range:	Panchromatic, R, G, B, NIR
Panchromatic:	465-495 λ (nm)
Blue:	435-495 λ (nm)
Green:	530-580 λ (nm)
Red:	610-660 λ (nm)
Near Infra-Red:	840-900 λ (nm)
Field of View:	64 degrees across track ( swath angle)
f-number:	4
Registration Accuracy:	1 µm
Lens Design:	Maintains position and width of all filter edges over the whole Field of View. Thermic and pressure compensation for high accuracy

Flightlines
+- Leaflet | Esri

Data linage
Flight line information can be provided as a shape file using the internal project id m3802. The Leica ADS80 is equipped with a SH82 sensor head with a field of view (swath angle) of 64° and multiple linear CCD’s of 12 000 pixels each, enabling the capture of 5 spectral bands of information. These bands are; panchromatic having spectral wavelength between 465-495 λ (nm), blue (B) having a spectral wavelength between 435-495 λ (nm), green (G) having a spectral wavelength between 530-580 λ (nm), red (R) having a spectral wavelength between 610-660 λ (nm), and near-infrared (NIR) having a spectral wavelength between 840-900 λ (nm).This product has been created using a documented process which is consistent with well accepted digital image processing techniques ( Leica GeoSystems ADS80 User Manual 2010). This process includes the following steps: 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. 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. 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. 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. For this rapid response imagery, no surveyed control is used in the aerotriangulation process. 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. The surface models used varies between imagery and include Leica auto correlated surface models, edited or unedited LPI DTMs, or LiDAR DEM.The colour difference between overlapping image strips are autocorrected to balance the colours across the entire project area. Colour balancing is not completed for rapid response products. 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. For rapid response emergency imagery, seamlines may be straight, automatic or slightly improved to remove artefacts such as cloud as much as possible. ) 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. Not available for rapid response products A target compression ratio of 5 is used to create the ECW file with negligible pixel level change. The actual compression ratio may vary according to the file size, platform and software used. NSW Government 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. REFERENCES: Leica Geosystems (2009). Leica ADS40 Ground Processing Software GPro User Manual (Version 3.3.3 (English) ed.). International Organisation for Standardisation (ISO) (2005). ISO/IEC 27001:2005 Information technology -- Security techniques -- Information security management systems -- Requirements (Vol. ISO/IEC 27001:2005).Privacy and Personal Information Protection Act (1998). Privacy Code of Practice (General)(2003). Privacy and Personal Information Protection Regulation 2005 (2005). State Records Act No 17(1998). Leica GeoSystems ADS80 User Manual (2010).

Data Usage Policy

Licence: Access and Licenses are managed by Spatial Services, a unit of Department Customer Service. Spatial Services creates and manages intellectual property (IP) for the Crown in right of New South Wales. Acquisition of this data is subject to the customer entering into an appropriate Creative Commons license agreement. To the extent that Creative Commons licensing applies, all data and other material produced by Spatial Services constitutes Crown copyright. Spatial Services has applied the Creative Commons Attribution 4.0 Australia Licence. Spatial Services asserts the right to be attributed as author of the original material in the following manner:© Department Customer Service. Additional terms for the use of Spatial Services material include that any derived products which are created will be required to clearly mark the date that any extractions from the Spatial Services Spatial Database occurred. All Intellectual Property (IP) which is owned by Spatial Services should only be loaded on any external cloud platforms if Spatial Services' Intellectual Property (IP) remains unchanged, maintained and preserved.
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 Spatial Services.

Copyright: 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 Spatial Services.

Intellectual Property: Spatial Services creates and manages intellectual property (IP) for this data for the Crown in right of NSW. Spatial Services 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.

Other Restrictions: 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.

Contact Us

Organisation Name: Spatial Services, a unit of Department of Customer Service

Organisation Address: 346 Panorama Ave, Bathurst, NSW 2795

Email: ss-sds@customerservice.nsw.gov.au

Website: https://six.nsw.gov.au/
www.spatial.nsw.gov.au

Phone: 02 6332 8287