MIVIS image geocoding experience on merging position attitude system data and public domain GPS stream (ASI-GeoDAF)

G. Avanzi, A. Palombo, S. Pignatti


The use of airborne scanners involves geo-referencing problems, which are difficult because of the need to know
the exact platform position and attitude for each scan line. The errors of the onboard navigation system are normally
corrected using ground control point on the image. This post-processing correction procedure is too long
in case of multiple flight campaigns, and besides it implies the need to have available 1:10000 orthophotoimages
or maps in digital format. To optimize the above procedure a new method to correct MIVIS navigational
data in the post-processing phase has been implemented. The procedure takes into consideration the GPS stream
in Rinex format of common knowledge and findable on the web, acquired at the ground stations of the Geodetic
Data Archiving Facilities provided by ASI. The application of this correction entails the assumption that the
environmental variables affecting both onboard and geodetic GPS equally affect the position measurements. The
airborne data correction was carried out merging the two data sets (onboard and ground station GPS) to achieve
a more precise aircraft trajectory. The present study compares the geo-coded images obtained by means of the
two post-processing methods.


MIVIS;geocoding;geometric correction;GPS

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DOI: https://doi.org/10.4401/ag-3143
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X