EDITOR’S NOTE Geopersia is published biannually by the College of Science, University of Tehran, Iran. The College of Science published “Journal of Science”, which covered all fields of basic science, from 1968 to 2010. It was then decided that the College’s journals should be more specialized, and hence publication of Geopersia was launched. Geopersia aims to publish peer-reviewed original...

We introduce the successive Hitting Set model, where the set system is not given in advance but a set generator produces the sets that contain a specific element from the universe on demand. Despite incomplete knowledge about the set system, we show that several approximation algorithms for the conventional Hitting Set problem can be adopted to perform well in this model. We describe, and exper...

We study a geometric hitting set problem involving unirectional rays and curves in the plane. We show that this problem is hard to approximate within a logarithmic factor even when the curves are convex polygonal x-monotone chains. Additionally, it is hard to approximate within a factor of 76 even when the curves are line segments with bounded slopes. Lastly, we demonstrate that the problem is ...

Urban land cover/use changes like urbanization and urban sprawl have been impacting the urban ecosystems significantly therefore determination of urban land cover/use changes is an important task to understand trends and status of urban ecosystems, to support urban planning and to aid decision-making for urban-based projects. High resolution satellite images could be used to accurately, periodi...

Polarimetric synthetic aperture radar remote sensing extracts the information about target using decomposition models to separate polarimetric into single-bounce (contributed by smooth surfaces), double-bounce urban structure), and volume (mainly due vegetation cover) scattering components. The penetration capacity of electromagnetic wave surface increases with decrease in its frequency. This s...

Functional integration is the compatibility between the structure, culture and competence of an organization and its computer systems, specifically the availability of data and functionality and the consistency of user interfaces. Many people use more than one computer program in their work, and they experience problems relating to functional integration. Various solutions can be considered for...

Functional integration is the compatibility between the structure, culture and competence of an organization and its computer systems, specifically the availability of data and functionality and the consistency of user interfaces. Many people use more than one computer program in their work, and they experience problems relating to functional integration. Various solutions can be considered for...

Classification from Synthetic aperture radar(SAR) is known to be difficult because of the speckle and variation in scattering coefficient with incidence angle, especially for high resolution airborne SAR. In western China, most areas are cloud cover perennially, which hinders acquisition of optical images. Airborne SAR data will be a good choice for big scale mapping purpose. To make effective ...

Recently, changes in society have brought about the rediscovery of continuous cover forestry (CCF) as a forest management approach that helps to create multifunctional forests. However, practice CCF is only used relatively small area world, and its development potential unclear. We studied owners practising act niche experimenters provide clear-cutting-oriented Estonian with experience for spec...

The delineation of shifting cultivation landscapes using remote sensing in mountainous regions is challenging. On the one hand, there are difficulties related to the distinction of forest and fallow forest classes as occurring in a shifting cultivation landscape in mountainous regions. On the other hand, the dynamic nature of the shifting cultivation system poses problems to the delineation of ...