Processing and correction of aerial and satellite images
SIRS has a department for processing aerial and satellite images. Its services range from selecting and acquiring raw data from various national or international providers – all image types, at medium, high or very high resolutions, on paper or digitally, optical or radar – to supplying orthorectified images, radiometrically corrected and mosaiced.
SIRS can also handle non-metric aerial photographs as well as old aerial photosets whose images are in a poor condition and lack camera or viewpoint parameters.
To be usable, an aerial photo or satellite image must include internal and external orientation information so that the geometric viewpoint conditions can be recreated mathematically. In the orthorectification process, a Digital Terrain Map (DTM) is used to correct each image pixel by removing deformations caused by the relief.
These image processes and corrections allow our clients to superimpose new information layers on their reference data: unused archival background images, historical data in order to undertake a diachronic territorial study, newly acquired satellite data, etc.