Camera Calibration
Client requires camera calibration information and focal length for aerial photography
Camera calibration and focal length reports are available for historical photos and can be supplied for free if you are only after one or two. To identify the photo, please send us the Film and Frame number.
If you require a large number of reports then a cost would be involved for the time taken to collate and scan the information.
Can I make corrections to the images?
Currently, all corrections to the imagery need to be completed in-house. In the future, we may investigate crowdsourcing for image alignment corrections.
The coordinates are displaying incorrectly
The aerial photographs are displayed using centroid coordinates digitised off Flight Key Diagrams. The scale of these diagrams was around 1:500,000. At this scale 1mm is 500 metres. If a person digitising the centroid is out by 2mm than the coordinate is out by 1 kilometre. Then one must consider how accurately the diagram was set up on the digitising tablet and the control points added.
As well as these variables, one has to consider that the centroids were essentially produced to provide a means to locate the photos.
The provision of these centroid values to users was customer driven, ie "why can't we have the coordinates so we can put them our GIS software?" If they are not orthorectified images, they will not be suitable for overlaying other spatial datasets correctly. The customer has the option to rubber sheet the images, but these also won't be suitable because of the camera distortions, variations in terrain height and orientation of the airplane at the time of exposure.
How do I report misaligned imagery?
Imagery that is misaligned up to a couple of hundred meters is considered within tolerance. If you find any imagery that requires rotating or is profoundly mislocated, please provide us with the run name, film number and frame number/s.
Film references and symbols
The table below explains what the film reference/symbols mean
Symbol | Meaning |
1A, 1B, 3W, 3E | Re‐flys or part runs |
ET, WT, CT | Tie Runs |
Obl, LOB, SEA | Oblique photography, Left Oblique, View towards Sea |
QAP, DIG | Departments and Authorities under the control of the Queensland Government. The only negatives held in storage by the department and to which Crown Copyright applies. |
CAB/CABC/CABG | Films flown for and retained by AUSLIG. |
SVY, MAP | Films flown for and retained by the RAAF. |
SO, SOC | Films flown for and retained by AUSLIG. |
BCC | Films flown for and retained by the Brisbane City Council. |
Imagery Quality
The image preview displays as black frames
While the preview images are black, the image is fine when downloaded.
The downloaded image displays with foggy lines through it
The foggy lines could be caused by glare from the dials on the side of the frame or a deterioration of the film. It is likely that they would have occurred at the time of capture.
Imagery Sources
Are all images of Queensland available?
QImagery displays images where the department is the custodian. The Commonwealth Government (Geoscience Australia) are custodians of the Commonwealth aerial film photography (SVY ,CAB, RAAF, MAP prefixes) and have an access pathway already established through a company in Melbourne that are able to provide high/low resolution scans from the original film. For more information visit their website: https://www.ga.gov.au/scientific-topics/earth-obs/accessing-satellite-imagery/aerial-photography
Add Comment