Available Imagery

Owned by Lauren Ravizzotti
31, Aug, 2022
1 min read

Coverage

QImagery contains Historical Aerial Photography captured since the 1930's and the QSat 2017 240cm Planet Q3 satellite imagery. As the aerial film digitisation project progresses, images will be updated as available.

Quality

Historical Aerial Photography available through QImagery under open licencing is down sampled to 400dpi to enhance ease of access (bandwidth) at a minor loss of imagery quality. The resolution varies according to the flying height of the aircraft for a particular project.

The Quality statement for the QSat 2017 240cm Planet Q3 satellite imagery can viewed on the Queensland Spatial Catalogue (QSpatial) at http://qldspatial.information.qld.gov.au/catalogue/custom/search.page?q=title:%22Queensland%20Satellite%20Data%20-%20QSat_2017_240cm_Planet_Q3%22

Locational Accuracy

  1. The Historical Aerial Photography images viewable in the QImagery web application have been geo-located via an algorithm that rotates and scales each photograph to approximate size, based on the recorded geographical position of the photograph’s centroid (central point).

  2. The centroids may have been digitised direct from key diagrams that may have been incorrectly produced in the first instance, or hand-drawn to varying levels of accuracy. On occasion this could result in photographs being displayed in QImagery out of position, or rotated and scaled incorrectly.

  3. In addition, each raw photographic image contains distortions, particularly around the edges, which is a common artefact of camera lenses and the photographic process.

  4. The Department intends to progress rectification of the Historical Aerial Photography which, through a rigorous geometric rectification process, will enable the accurate overlay of other spatial datasets.

  5. The Department welcomes feedback on corrections to the location and incorrect display of Historical Aerial Photography in QImagery.

  6. The positional accuracy of the QSat 2017 240cm Planet Q3 satellite imagery can viewed on the Queensland Spatial Catalogue (QSpatial) at http://qldspatial.information.qld.gov.au/catalogue/custom/search.page?q=title:%22Queensland%20Satellite%20Data%20-%20QSat_2017_240cm_Planet_Q3%22