علمی - پژوهشی
Speckle reduction in SAR images based on an adaptive filtering in the frequency domain

Hamid Jannati; Mohammad Javad Valadan Zoej

Volume 12, Issue 2 , August 2020, Pages 1-18

https://doi.org/10.52547/gisj.12.2.1

Abstract
  Speckle in Synthetic aperture radar images makes grainy effects, because of the coherent imaging system which cause some difficulties in object-oriented processes, like segmentation or classification. Therefore, a lot of methods have been developed for speckle reduction purpose. These methods can be ...  Read More

علمی - پژوهشی
The Impact of Urban Growth and Development Trend on Ecological Network Structure with Resilience and Landscape Approach (Case study of Hamedan)

maryam omidpour; Romina Sayahnia; Y Rezaei

Volume 12, Issue 2 , August 2020, Pages 19-32

https://doi.org/10.52547/gisj.12.2.19

Abstract
  Urban development is an inevitable subject due to the increasing population growth in cities. The city consists of open and living systems and a combination of socio-ecological systems. On the one hand, the hurried process of urban growth resulted in the land use change. Subsequently, this manner will ...  Read More

علمی - پژوهشی
Adoption of IoT technology to estimate evapotranspiration from satellite imagery

Soheil Radiom; hossein Aghighi; Hamid Salehi Shahrabi

Volume 12, Issue 2 , August 2020, Pages 33-44

https://doi.org/10.29252/gisj.12.2.33

Abstract
  Evapotranspiration is one of the most important components of energy and water balance. The most important way to get real large-scale evapotranspiration is to utilize satellite imagery and remote sensing. Implementation of evapotranspiration calculation algorithms such as SEBAL demands calculation of ...  Read More

علمی - پژوهشی
Extraction of vegetation from Landsat satellite images using rationalized Haar wavelet algorithm

Kazem Aliabadi; omid baghani

Volume 12, Issue 2 , August 2020, Pages 45-56

https://doi.org/10.52547/gisj.12.2.45

Abstract
  This study aims to provide a computational-approximate algorithm based on Rationalized Haar (RH) to estimate the vegetation of the Landsat image using reflecting this phenomenon in the near-infrared band. This band is in the RGB color combination and located in the R section.This algorithm, using Digital ...  Read More

علمی - پژوهشی
A Novel Method for Forest Height Estimation Using PolInSAR Data

Amir Aghabalaei; Hamid Ebadi; Yasser Maghsoudi

Volume 12, Issue 2 , August 2020, Pages 57-72

https://doi.org/10.52547/gisj.12.2.57

Abstract
  Monitoring the earth and its biosphere is an essential task in any scale to achieve a sustainable development. Therefore, forests, as an invaluable natural resource, have an important role to control the climate changes and the carbon cycle. For this reason, biomass and consequently forest height have ...  Read More

علمی - پژوهشی
Evaluation of Anzali Wetland Depth Changes Using Satellite Images and Meteorological Data over Thirty Years

Saba Kharyaband; S Attarchi

Volume 12, Issue 2 , August 2020, Pages 73-82

https://doi.org/10.52547/gisj.12.2.73

Abstract
  In recent decades in Iran, due to the effect of climate change and population growth, the extent and depth of water in wetlands have been largely decreased. Therefore, it is worth finding the main reasons of the changes and if possible to reduce the rate of changes. Great advances in remote sensing technology ...  Read More

علمی - پژوهشی
The combination of attraction model and genetic algorithm to predict stream networks

M Shaygan; M Mokarram

Volume 12, Issue 2 , August 2020, Pages 83-94

https://doi.org/10.52547/gisj.12.2.83

Abstract
  The aim of this study was to use the attraction model to increase the spatial resolution of the Digital Elevation Model (DEM) and to use the genetic algorithm to predict stream network in the future and compare its results with stream of extraction of DEM with resolution of 30 m. In the quadrant neighborhood, ...  Read More