Abstract
Analogue aerial-photopraphs external orientation reconstruction based on geoportal data For acquisition of source data for geoinformation analyses is necessary to do some field works. This way of data acquisition is time-consuming. In this case, photogrammetric and remote sensed methods can be more effective choice. Especially orthophotomap extracting is more effective process in creation of geodata. It is good foundation for further analysis and nice extension of existing geographical information systems. Despite fast growth of photogrammetry there are plenty of analogue, archival airphotos which can be used for geoinformation analysis. They are quiet up to date and scanned in very high resolution which means they can be used for really reliable analysis. The problem is very important because many of analogue, archival air photos do not contain photogrammetric warp. The aim of this paper is expression of applicability of geoportal webpage, which is part of INSPIRE directive, that can be used for external orientation reconstruction when there is no other georeference data.
Highlights
Information about external orientation of aerial photographs is collected automatically using digital aerial cameras during their acquisition
The spatial resolution of the images was decreased by author to determine the influence of spatial resolution on the quality of the orthophotomap when georeference data is obtained from geoportal. gov.pl webpage
For the quality of orthophotomap evaluation in respect of point location precision, depending on the aerial photographs spatial resolution, the net of 9 points was inflicted on final orthophotomap
Summary
Information about external orientation of aerial photographs is collected automatically using digital aerial cameras during their acquisition. If photos do not contain photogrammetric warp it is necessary to collect reference data which is needed to reconstruct external orientation using ground control points (Konecny 2001). Knowledge about external orientation is necessary for determining location of camera during data acquisition (Kurczyński 2006). It means that it is indispensable to collect reference data to reconstruct external orientation of aerial photographs. In this case, using data from national geoportal to reconstruct external orientation can be very significant. The main task of photogrammetry is to deliver information about topographical objects without physical contact with them (Konecny 2001). If the photogrammetric method has to be supplemented by field works, its competitiveness is getting lower
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