The LIST State Aerial Photo Basemap is a mosaic of aerial photographs geometrically corrected (âorthorectifiedâ) such that the scale is uniform. To get a state-wide coverage, photos with varying quality and at numerous different points in time are stitched together. Where available, the best quality photography is used, meaning that older, more accurate imagery may be used in preference to more recent, less accurate and poorer quality imagery.

Orthophotos were originally created from lower resolution scanned photographic prints using mapdata from the 1:25000 map series as control for position and height. Subsequent updating has occurred in many of the more populous areas of the state, however the less inhabited regions of Tasmania may not have been updated. As newer and better resolution imagery becomes available the existing orthoimagery is replaced and the basemap updated.

Position Accuracy: Varies according to imagery age and source. It can be obtained from the State Aerial Photo Index. Attribute Accuracy: The State Ortho Basemap is intended for use as a background for map data. Consistency: The orthoimagery creating the State Orthophoto Basemap is sourced from varying projects and over a wide timeline. Objects that cross adjoining imagery sets may not match and there may be a degree of colour and tonal variation throughout the coverage. Completeness: The entire state is covered by orthoimagery. Updating of the orthoimagery is ongoing and is dependent on availability of new aerial imagery.