Arvin Fakhri

K.N.Toosi University of Technology | KNTU · Faculty of Geodesy and Geomatics Engineering

Generating and evaluating three-dimensional (3D) models of unmanned aerial vehicles (UAVs) in forest environments often pose challenges due to the low contrast texture features of trees, especially in presence of sparse trees cover. Producing an accurate 3D model often involves testing a range of scenarios and processing settings that leads to the...

A Novel Method for Evaluating UAV-derived 3D Forest Models by Tree Features

Pollarding oak trees is a traditional silvopastoral technique practiced across wide areas of the northern Zagros mountains, a unique and vast semi-arid forest area with a strong cultural and ecological significance. So far, the effects of pollarding on tree structure in terms of DBH (diameter at breast height)~H (height) relationships within the ty...

Crack detection on roads’ surfaces is an important issue in pavement management, as it provides an indication of the quality of the road and its deterioration over time. Pavement cracks are one of the most common types of damage observed on roads, and they can be seen visually. Despite the fact that it does not provide immediate resolution to the i...

The necessity of continuously monitoring the agricultural products in terms of their health has enforced the development of rapid, low-cost, and non-destructive monitoring solutions. Heavy metal contamination of the plants is known as a source of health threats that are made by their proximities with pollutant soil, water, and air. In this paper, a...

Detailed maps and road maps have broad and vital applications in military, urban design, crisis management, and accidents. Today, on the one hand, with the development of remote sensing sciences, the use of aerial and satellite images has expanded, and on the other hand, new advances in the processing of these images have led to improved analysis r...

Vegetation cover maps across ecologically-fragile and particularly arid and semi-arid forest ecosystems are prerequisites for their monitoring and management. Direct and field-based measurements of vegetation cover pose serious challenges due to high costs and inaccessibility in harsh terrains, whereas multispectral remote sensing offers objective,...

جنگل‌ها نقش اساسی در حفاظت از منابع آب و خاک ایفا می کنند و خدمات اکوسیستمی متعددی را ارائه می دهد. به همین دلیل باید پایش مستمر در جنگل‌ها انجام شود. کمی سازی ساختار جنگلی از جمله اقدامات مهم در این راستا است. در این تحقیق، ما چارچوبی مبتنی بر فتوگرامتری پهپاد، جهت اندازه‌گیری متغیرهای ساختاری مهم ارتفاع (H) و سطح تاج (A) درختان در سرتاسر جنگل‌های...

Semi-arid tree covers, in both high and coppice growth forms, play an essential role in protecting water and soil resources and provides multiple ecosystem services across fragile ecosystems. Thus, they require continuous inventories. Quantification of forest structure in these tree covers provides important measures for their management and biodiv...

In recent years, the use of UAV-based photogrammetry has been very popular due to its many benefits and low cost and it has been used in various applications. Low-strength lenses are commonly used in the construction of cameras used in drones, which causes various errors in the imaging process. Errors related to the camera geometry affect the extra...

In mountainous areas with sparse woody vegetation, tree cover is among the most crucial indicators for landscape conservation and ecosystem stability. It is thus essential to be continuously monitored, which is yet seriously hurdled by harsh topography and inaccessibility. Field-based methods are time consuming and costly and are thus particularly...

Over the past decades, non-metric cameras have been utilized in functions with less accuracy requirement or even in precise works with the progress of photogrammetric cameras developed technology. One of the reasons to use these kinds of cameras is due very much to their lower costs in comparison with the metric ones. Since we have always error in...

Crack is one of the main problems of roads that can reduce the quality of the road or put it in danger in terms of safety. These cracks are needed to be identified first in order to be investigated and followed up. So detecting cracks is one of the most important parts of the road maintenance procedures, which has been considered in recent years. O...

There are a wide range of modern waste disposal systems and the costs of operating them greatly vary. The type of waste disposal system to be used is selected based on the nature of the operation, process and needs of the local community. In Iran, mixed municipal waste with significant contamination and humidity is prevalent. As a result, the most...