engleski

Spatial and radiometric quality of the mosaic of images acquired by airborne digital VNIR matrix camera and TIR line scanner

The analogue aerial photo cameras are using the panchromatic, color visible, color infrared film and dominate in wide area photogrammetric data acquisition but also digital cameras became available on the market. Digital airborne sensors offer new technical and opperational opportunities although require new approaches, knowledge, education and training. While very suitable and efficient in use the digital airborne sensors bring new problems that should be solved for best quality of their products. In this paper we consider the quality of spatial and radiometric features of the mosaic of images acquired by two digital airborne sensors that have different modes of image formation and work at different wavelenghts. The first sensor is the digital matrix (staring) camera, for three visible channels (V: 0.4–0.5 μm, 0.5-0.6 μm, 0.6-0.7 μm), for near infrared channel (NIR: 0.7-1.0 μm) and the second sensor is the longwave thermal infrared (TIR: 8-14 μm) parallel scan camera. Although for TIR wavelengths exist matrix cameras they have rather limited resolution (320x240 pixels) and the parallel scan cameras are in intensive use due to better resolution. The both sensors are in intensive operational use in Croatia, and this was the motif for this analysis. We analyse spatial and radiometric quality of the mosaic of high resolution VNIR images (1392x1040 pixels) and of TIR images (600x400 pixels). If compared to VNIR images, TIR images have spatial distorsions due to parallel scanning mode. For the case study was selected the scene that has small number of objects that could be used for registration of TIR images onto VNIR images. The work is part of the research conducted in the scientific project ARC funded by European Commission.

mosaic; geocoding; digital parallel scan camera; digital matrix camera; geometric deviation; radiometry deviation

Rad je kao predavanje prezentiran na skupu "Geoinformation for practice" u organizaciji International Society for Photogrammetry and Remote Sensing (ISPRS), održanom od 15.-18.10.2003. ; Zagreb, Hrvatska