1,721,002 research outputs found
Metric quality evaluation of satellite high resolution images in urban areas
No full textThe recent acquisition of high resolution satellite images leads one to consider and evaluate their potential metric accuracy in order to point out if they can successfully be used for photogrammetric applications. This study shows some results referred to the planimetric accuracy obtained by orthocorrection of IKONOS 2 panchromatic images acquired on urban areas. The procedures have been carried on using the OrthoEngine7 satellite module available within the software PCI
Sustainable approach of the “fast mapping” technique for developing countries and areas recently affected by war events
No full textThe availability of high resolution satellite images (HRSI) is introducing a new challenge in the mapping environment. Imagery coming from high resolution satellites such as QuickBird, Ikonos, Eros-A1 or the new Orbview-3, seem to become in the next years a powerful tool to derive topographic maps, comprehending medium and large scales as well. Many researches on this topic have stated the usefulness of HRSI to yield cartography in those countries where the production based on traditional methods (aerial photogrammetry) cannot be really afforded, particularly for developing countries and areas recently affected by war events. Obviously, the cartographic products that might be obtained using satellites data are different with respect to traditional 3Dnumerical maps. Moreover, the pixel size of current sensors seems to allow map production up to 1:10,000 scale.
In this paper the authors propose a new cartographic product, called “Fast Mapping” (FM), completely derived from spaceborne sensors and discuss about the accuracy that can be obtained by this technique. The FM is based on planimetric digital maps, derived from the geometric correction of HRSI using Digital Terrain Models (DTMs) and integrated by a set of vector layers acquired by palm GPS receivers. The peculiarity of this kind of maps is the approach to data collection, which is performed by low-cost and fast techniques. In addition, the transfer process of these technologies from researchers to local operators is really sustainable. A description of the technique is given and some case studies are presented
Developing Contries and Areas Affected by War Events
No full textThe availability of high resolution satellite images (HRSI) is introducing a new challenge in the mapping
environment. Imagery coming from high resolution satellites such as QuickBird, Ikonos, Eros-Al or the new
Orbview-3, is likely to become in the next years a powerful tool to derive topographic maps as well as a
comprehending medium at large scales. Many researches on this topic have stated the usefulness of HRSI LO
yield cartography in those countries where the production based on traditional methods (aerial photogrammetry)
cannot be afforded, particularly for developing countries and areas recently affected by war events. Obviously,
the cartographic products that might be obtained using satellites data are different with respect to traditional 30-
numerical maps. Moreover, the pixel size of the current sensors seems to allow map production up to 1:10,000 scale. In this paper the authors propose a new cartographic product, called "Fast Mapping" (FM), completely derived
from spaceborne sensors and discuss the accuracy that can be obtained by this technique. The FM is based on
planimetric digital maps, derived from the geometri c correction of HRSI using Digital Terrain Models (OTMs)
and integrated by a set of vector layers acquired by palm GPS receivers. The peculiarity of this kind of maps is
the approach to data collection, which is performed by 10w-cOSI and fasi techniques. In addition, the transfer
process of these technologies from researchers LO local operators is reaJly sustainable. A description of the
technique is gi ven and some case studies are presented
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