List of Articles Bojnurd

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  1 - Comparison of unmanned aerial vehicle (UAV) RGB imagery and point clouds in crown area estimation of individual trees within pine (Pinus eldarica) man-made forests
  Ali Hosingholizade Yousef Erfanifard Seyed Kazem Alavipanah Homan Latifi Yaser Jouybari Moghaddam
  10.30495/girs.2023.689615
  Application of unmanned aerial vehicles (UAVs) is widespread in measurement of quantitative characteristics of single trees such as crown area. However, the efficiency of different types of data collected by UAVs are less compared. Therefore, the aim of this study was c More

  Application of unmanned aerial vehicles (UAVs) is widespread in measurement of quantitative characteristics of single trees such as crown area. However, the efficiency of different types of data collected by UAVs are less compared. Therefore, the aim of this study was comparison of UAV RGB imagery and point clouds in crown area estimation of individual pine trees within a man-made forest in Pardisan Park, Northern Khorasan province, Iran. Both datatypes were analyzed by similar segmentation method (Multiresolution segmentation on the RGB images and Marker-Controlled Watershed algorithm in the point clouds) to estimate crown area of 324 sample pine trees. The results showed that the crown area measured on the point clouds had higher accuracy and precision compared to RGB imager (Spearman correlation of 0.95 and 0.81, coefficient of determination of 0.97 and 0.59, p-value of 0.97 and 0.001, respectively). Additionally, crown area of pine trees with large crown (> 18 m2) delineated on the point clouds showed the highest accuracy in comparison to trees with small and medium crowns. In general, it was concluded that segmentation of UAV point clouds was more efficient than RGB imagery segmentation in quantification of crown area of pine trees within the study area. Manuscript profile
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  2 - The feasibility of high-rise construction in in Bojnurd
  Hassan Parsipour
  Absatract:The pace of urbanization in the world especially in developing countries in the recent decades has caused urban environment instability challenges. One of the problems is horizontal and immethodical expansion that has caused traffic, more use of energy, more e More

  Absatract:The pace of urbanization in the world especially in developing countries in the recent decades has caused urban environment instability challenges. One of the problems is horizontal and immethodical expansion that has caused traffic, more use of energy, more environmental pollution and social isolation. If urban management is trying to control and reduce the urban problems to present urban expansion models, then it should reconsider urban planning methods and create efficient models in urban environments.This essay is aimed to present modern and efficient methods of urban structures by clarifying the infill development model and urban high-rise construction method and is also trying to answer the question that: " Can high-rise construction be an acceptable method of urban endogenous development in Bojnurd as a medium-sized city? " by conducting library and field studies and a practical research method.Bojnourd is a medium-sized city in the northeast of the country.The city has an area of more than 3,000 hectares and a population of about 250,000. The results show that Bojnurd expansion has faced urban sprawl over the past 20 years and about 70 hectares have been added to the city area while the available area of the city has the endogenous development potential and standard compact construction; and checking the population compaction, land value and urban pathways capacity and the questionnaire outcomes done by urban managers show that in some peripheral areas of the city, there is the potential of high-rise construction up to 6 floors in order to prevent the immethodical city expansion. Manuscript profile