DSM and Orthoimages from QuickBird and Ikonos Data using Rational Polynomial Functions
Lehner, Manfred and Müller, Rupert and Reinartz, Peter (2005) DSM and Orthoimages from QuickBird and Ikonos Data using Rational Polynomial Functions. In: High Resolution Earth Imaging for Geospatial Information, Vol. XXXVI, . High Resolution Earth Imaging for Geospatial Information, Hannover, 17.-20. Mai 2005. ISBN ISSN No. 1682-1777.
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The rigorous approach for the derivation of digital surface models (DSM) and orthoimages from satellite and airborne scanner imagery via full modelling of the imaging process requires the knowledge of exterior and interior orientation of the camera. For IKONOS and QuickBird this basic data is not (fully) available to the user. Instead, rational polynomial functions (RPF) in standard form are provided as a substitute for describing the relationship between image and object space. To be able to derive DSM and orthoimages for this type of data even in the absence of appropriate ground control, software based on RPF has been developed. The software allows a lot of datums and projections for input and output data. This is important for worldwide application e.g. in case of catastrophes. The paper shows that a RPF is very near to linear in the object space variables longitude, latitude and height. This explains a large convergence radius and a rapid convergence in case of forward intersection. Residuals in image space from forward intersection are small and nearly constant in case of the GEO IKONOS-2 images tested. Large (also nearly constant) residuals in case of the QuickBird stereo pair can be used for a relative correction of the RPF either using residuals from verticality constraints with manually measured top/foot tie point pairs of large buildings or from forward intersection of a set of excellent tie points from matching. These corrected RPF can then be used to create a self-consistent set of DSM and orthoimages. The DSM derived from the high resolution data via RPF processing have been compared to best DSM available which was in most cases a C-Band SRTM model. Estimated mapping accuracy was found to correspond with the promises of the image provider in the case of available ground control.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||DSM and Orthoimages from QuickBird and Ikonos Data using Rational Polynomial Functions|
|Journal or Publication Title:||High Resolution Earth Imaging for Geospatial Information|
|ISBN:||ISSN No. 1682-1777|
|Keywords:||rational polynomial functions, orthoimages, digital surface models, QUICKBIRD, IKONOS|
|Event Title:||High Resolution Earth Imaging for Geospatial Information, Hannover, 17.-20. Mai 2005|
|Organizer:||ISPRS Working Groups I/5 und IV/3|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||Cornelia Roehl|
|Deposited On:||09 Oct 2005|
|Last Modified:||14 Jan 2010 19:55|
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