137 research outputs found
3D cloud products for weather prediction and climate modelling
In this paper, the possibilities of satellite-based and
ground-based stereoscopy of clouds are examined,
with the objective to derive cloud top and cloud base
heights and motion. These parameters are very important for a better description of clouds for nowcasting
and numerical weather prediction models. For the satellite part, images of ATSR2 (on ERS-2) and MISR
(on EOS Terra) are used. As stereo image pairs from
polar-orbiting satellites are never perfectly synchronous
(time delay of some seconds between the image
reeeption from the different viewing angles), the height
error of the cloud top heights, introduced by the
along-track motion component, is corrected with the
cloud top winds extracted from Meteosat-6 and -7.
For MISR, with nine viewing angles, this height correction is not needed when at least three images from
non-symmetric cameras are used; then, it is possible
to directly separate the along-track parallax (due to
cloud height) from the along-track wind contribution
(due to cloud motion). Our new ground-based imager
System was operated in eoineidence with an overpass
of ERS-2 in October 1999. The ground measurements
proved to be an interesting technique to validate satellite-based cloud top height and motion of vertically
thin clouds and to additionally detect more detailed
cloud features, which is particularly important for aecurate
noweasting in mountainous terrain
Airborne photogrammetry and lidar for DSM extraction and 3D change detection over an urban area â a comparative study
CLASSIFICAĂĂO DE NUVEM DE PONTOS LASER UTILIZANDO O CONCEITO DE ANĂLISE DE COMPONENTES PRINCIPAIS E O FATOR DE NĂO AMBIGUIDADE
Assessing biomass based on canopy height profiles using airborne laser scanning data in eucalypt plantations
Photogrammetric error sources and impacts on modeling and surveying in construction engineering applications
Use of DTMs/DSMs and Orthoimages to Support Building Extraction
The acquisition of 3D models of buildings and other man-made objects is currently an is-sue of high importance to many users of geoinformation, including planners, geogra-phers, architects, etc. Aerial imagery has proven to be a valuable data source for these models. The project AMOBE1, a joint research effort between the photogrammetry an
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