15 The geodiversity of Crete is quantified in this study, based on the classification of 16 geomorphometric, geological and climatic factors. A number of geomorphometric variables, 17 extracted from the ASTER Global Digital Elevation Model (ASTER G-DEM) in conjunction 18 with geological and climatic information, are evaluated through various algorithms incorporated 19 into Geographical Informat...

Variation in the computation of slope from digital elevation data can result in significantly different slope values and can, in turn, lead to widely varying estimates of environmental phenomena such as soil erosion that are highly dependent on slope. Ten methods of computing slope from distributed elevation data, utilizing capabilities inherent in five different geographic information systems ...

Flooding is one of the most devastating natural disasters occurring annually in the Philippines. A call for a solution for this malady is very challenging as well as crucial to be addressed. Mapping flood hazard is an effective tool in determining the extent and depth of floods associated with hazard level in specified areas that need to be prioritized during flood occurrences. Precedent to the...

There is a need to automate terrain feature mapping so that to make the process more objective and less time consuming by using proper feature extraction techniques. The objective of this study was the use of object-oriented image analysis methods for the automatic extraction of alluvial fan terrain units. The study area was located in the Death Valley, Nevada, USA. The data used included an AS...

TAPES-G is a grid-based terrain analysis program that computes slope, aspect, upslope contributing area, profile and plan curvature and several other topographic attributes for each cell of a square-grid digital elevation model (DEM). These topographic attributes can be used to represent key physical processes in a form simple enough to allow modeling at catchment and larger scales. The program...

This paper presents a method for co-registration of Chang’E-1 lunar orbiter stereo images and laser altimeter (LAM) data for 3D mapping of lunar surface. First, a digital elevation model (DEM) is automatically generated from the three-line CCD stereo images based on rigorous pushbroom sensor model and multi-level image matching. The DEM is then registered to LAM data through surface matching wi...

The ASF Science division has released the world's first free end-to-end interferometric digital elevation model (DEM) generation system. This software, which processes from raw signal data through to a map-projected, ground-range 20m DEM, is completely automated. Preliminary comparison with differential gobal positioning system (GPS) indicates that over a 100km swath, horizontal position errors...