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Metadata\u00a0

\u00a0

Content Title\u00a0

Historical Imagery Viewer

Content Type\u00a0

Web Application

Description\u00a0

An app associated with the Historic Imagery Map V2 is created for the Search, Discovery and Display of historical imagery in NSW.

Initial Publication Date\u00a0

26/05/2020

Data Currency\u00a0

23/10/2023

Data Update Frequency\u00a0

Other\u00a0

Content Source\u00a0

Other

File Type\u00a0

Map Feature Service\u00a0

Attribution\u00a0

\u00a0

Data Theme, Classification or Relationship to other Datasets\u00a0

\u00a0

Accuracy\u00a0

\u00a0

Spatial Reference System (dataset)\u00a0

GDA94\u00a0

Spatial Reference System (web service)\u00a0

EPSG:4326\u00a0

WGS84 Equivalent To\u00a0

GDA94\u00a0

Spatial Extent\u00a0

\u00a0

Content Lineage\u00a0

\u00a0

Data Classification\u00a0

Unclassified

Data Access Policy\u00a0

Open

Data Quality\u00a0

\u00a0

Terms and Conditions\u00a0

Creative Common

Standard and Specification\u00a0

\u00a0

Data Custodian\u00a0

Spatial Services | NSW Department of Customer Service

Point of Contact\u00a0

DCS Spatial Services Customer Hub

Data Aggregator\u00a0

DCS Spatial Services

Data Distributor\u00a0

DCS Spatial Services

Additional Supporting Information\u00a0

Historical Aerial Photography (1930 to 2005)

Current and historic imagery form an important part of the NSW Foundation Spatial Data Framework and provide a valuable resource which is widely accessed by government and the broader community on a daily basis. As the completeness of this data base continues, its market demand also increases across a broad range of applications.

The Historical Air Photo Enhancement program (HAPE) not only allows the capability to search, discover and use source imagery, but also provides the delivery and viewing of enhanced historic rectified imagery mosaics. This new development means the community at large can now access and utilise spatially accurate historic imagery data directly in a wide range for GIS Mapping applications.\u00a0However, the horizontal accuracy of the imagery is dependent upon the resolution (GSD) of the image:

  • Horizontal accuracy of +/-2.5 x GSD (meters) at 95% confidence level on bare open ground using RMSE x 1.73.


There are two products accessible on the Historical Imagery Viewer:


Historical Aerial Photo Images (HAP)

These are standard 600dpi unprocessed frames as JPG\u2019s

Spatial Services has a huge repository of digitised Historical Aerial Photography.\u00a0 The collection has been acquired over a number of years from 1930 through to 2005. The imagery was\u00a0originally\u00a0captured using a variety of cameras including the Wild RC-5, RC-10 and Leica RC-30 cameras with a variety of lenses with focal lengths of 88mm, 153mm and 304mm.\u00a0 Images were captured in monochrome\u00a0or\u00a0colour during this period\u00a0at a range of\u00a0scales ranging from 1:10 000 to 1:80 000.\u00a0

Images have been digitised from either the aerial film negatives or hard copy prints up 2000dpi resolution depending on the scanned medium.

Historical Aerial Photo Enhancement Product (HAPE)

This is a Orthorectified product created from the Historical Aerial Photo Collection. A complete 100k coverage of individual photo frames was required for each project area for standard program capture. The Ortho rectification of individual photo frames with 60% forward overlap, that lie within and intersecting the relevant 100k map sheet.\u00a0

Spatial Services create the HAPE mosaics with a new process utilising Augmented Reality Modelling Software.

This is an automated process using an Augmented Reality Modelling Software to produce a 3D models of an area from simple photographs.

The Hybrid processing in this software enables the creation of reality meshes using Spatial Services archive of historical Air Photos, the image overlap and the photo centre points derived from the original Key Diagrams and flight reports.

From the Historical Aerial Photos and the \u201cessential information\u201d from the Key Diagrams we are able to create a 3d mosaic of the photo frames that we can flatten to a 2D ortho photo mosaic.

All images are loaded into the reality modelling engines where they go through a triangulation process with context capture using the X and Y coordinates of the photo centre and the Z coordinate created from the Flying height and other essential information.

Once this has been done the system identifies thousands of tie points and creates the 3D photo Mesh. Once the photo mesh has been created it can be flattened into an Ortho Photo mosaic.

TRIM Number\u00a0

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