Description
This is a black and white orthophoto taken from frames of the aerial flight ‘ALIFOTO 1975’. In order to produce this product, approximately 11,000 frames of the aerial flight ‘ALIFOTO 1975’ were scanned in black/white with an average scale of 1:15,000. The starting material is arranged in rolls of negative on gloss. The entire project area was divided into blocks and aerial triangulation was performed on each individual block, to facilitate calculations and to allow more control; accurate results. The division into blocks took into account the topography of the terrain, the analogue flight plan and, above all, the belonging of the frames to the same roll, to ensure uniformity; the transition from scanning to triangulation, without interruptions or seams, and the subdivision of the final orthorectified product. All negatives were scanned using a photogrammetric scanner with geometric accuracy of +-2microm and high radiometric performance with a dynamic range of 12bit and density range of 3.4D or greater. The scan was performed with a real optical resolution of 1200dpi, resulting in a digital image pixel size of about 30cm. The individual scans were saved in 8-bit TIFF format. The orthorectification operation was carried out using as a digital model of the land the Lombardy Region DTM with 20m sampling pitch.
Resources
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https://www.cartografia.servizirl.it/arcgis2/rest/services/BaseMap/ortofoto1975/ImageServer/WMTS?REQUEST=GetCapabilities&service=WMTS |
Tags
- mappe-e-foto-aeree-storiche
- ortofoto-1975
- cartografia-di-base-e-ortofoto
- eu
- alifoto