Accuracy assessment of a global digital elevation model (DEM) is an important and challenging task primarily because of the difficulties and costs associated with securing a reliable and representative reference dataset. In this article, we report on the vertical accuracy assessment of the WorldDEMTM, the latest global DEM using the synthetic aperture radar interferometry (InSAR) method, based ...

In the analysis of terrestrial laser scanning (TLS) data the digital terrain model (DTM) is one of important elements. To evaluate the DTM or to find the DTM by way of optimization it is necessary to formulate the measure of DTM quality. Three parameterized measures are proposed and tested against a comparative model for a series of TLS data. The measure equal to the number of points inside a l...

E-Learning beginnt, von der euphorischen Phase in die alltägliche Praxis überzugehen. Hierfür sind Kriterien zur Nutzung der neuen Medien zu präzisieren und in Veranstaltungseinheiten einzufügen. Solche Bedingungen und Forderungen aus dem Projekt SIMBA werden in diesem Artikel vorgestellt, wobei als Zielgruppe Studentinnen der Informatik gewählt wurden. Die konkrete Umsetzung wird anhand eines ...

The presents study was aimed to create new methods for extraction and analysis of land elevation contour lines, automatic extraction of water bodies (river basins and lakes), from the digital elevation models (DEM) of a test area. And extraction of villages which are fell under critical water scarcity regions for agriculture and drinking water with respect to their elevation data and available ...

by overlaying altimetric and vector data ! Frédéric Rousseaux ! Institut Géographique National France COGIT laboratory, 2-4 avenue Pasteur, 94165 SAINT-MANDE Cedex, France Tel : +33143980000 poste 7583 ; Fax : +33143988171 E-mail : [email protected] ; Website : recherche.ign.fr !!

Given that public transportation networks are often worse in rural areas than in urban areas, rural residents who do not drive can find it difficult to access health-promoting goods, services, and resources related to masticatory ability. Moreover, geographical location, assessed by elevation, could modify this association. The aim of this study was to test whether the association between acces...

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A new digital elevation model (DEM) is presented for accurate surface representation in photogrammetric processing of stereo ground-based imagery. This model is named the continuative variable resolution DEM (cvrDEM). In contrast to traditional grid-based DEMs that have only one fixed resolution, this new model can provide resolutions that vary depending on the range represented in the groundba...

Hibernation is a key life history feature that can impact many other crucial aspects of a species' biology, such as its survival and reproduction. I examined the timing of hibernation and reproduction in the federally endangered New Mexico meadow jumping mouse (Zapus hudsonius luteus), which occurs across a broad range of latitudes and elevations in the American Southwest. Data from museum spec...