introduction: gully erosion is an important type of soil erosion in iran and ardebil province (moghimi and salami, 2011; khatibi, 2006). increasing the cross section of gullies is an indicator for gully developing (deng et al, 2015). topography and soil properties are two important factors in gully developing in various regions of worldwide (poesena et al, 2003). despite the importance of soil ...

The problem of differential terrain illumination on satellite imagery has been investigated for at least 20 years and has not been solved satisfactorily. Most past research has been conducted on Landsat imagery where the look angle is nadir. There is no research on topographic correction of IKONOS imagery, which has a higher spatial resolution. The high spatial resolution of IKONOS imagery requ...

Ocean simulations are in part determined by topographic waves with speeds and spatial scales dependent on bottom slope. By their very nature, discrete z-level ocean models have problems accurately representing bottom topography when slopes are less than the grid cell aspect ratio Dz/Dx. In such regions, the dispersion relation for topographic waves is inaccurate. However, bottom topography can ...

[1] Hillslope sediment transport models express the sediment flux at a point as a function of some topographic attributes of the system, such as slope, curvature, soil thickness, etc., at that point only (referred here as “local” transport models) or at an appropriately defined vicinity of that point (referred here as “nonlocal” transport models). Typically, topographic attributes are computed ...

Traditional pixel-based image classification approaches have some limitations with the use of very high spatial resolution imagery. In recent years, object-based image analysis (OBIA) approaches has emerged with an attempt to overcome those limitations inherited to the conventional pixel-based approaches. When using OBIA approach, it is known that the quality of segmentation directly affect cla...