Metadata
Content Title Historical Imagery ViewerContent Type Web ApplicationDescription 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 26/05/2020Data Currency 23/10/2023Data Update Frequency Other Content Source OtherFile Type Map Feature Service Attribution Data Theme, Classification or Relationship to other Datasets Accuracy Spatial Reference System (dataset) GDA94 Spatial Reference System (web service) EPSG:4326 WGS84 Equivalent To GDA94 Spatial Extent Content Lineage Data Classification UnclassifiedData Access Policy OpenData Quality Terms and Conditions Creative CommonStandard and Specification Data Custodian Spatial Services | NSW Department of Customer ServicePoint of Contact DCS Spatial Services Customer HubData Aggregator DCS Spatial ServicesData Distributor DCS Spatial ServicesAdditional Supporting Information 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. However, 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’sSpatial Services has a huge repository of digitised Historical Aerial Photography. The collection has been acquired over a number of years from 1930 through to 2005. The imagery was originally captured 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. Images were captured in monochrome or colour during this period at a range of scales ranging from 1:10 000 to 1:80 000. 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. 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 “essential information” 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
