Recent Advances in UAV-Based Structure-from-Motion Photogrammetry for Aboveground Biomass and Carbon Storage Estimations in Forestry

Gülci, Sercan; Akay, Abdullah E.; Arıcak, Burak; Sarıyıldız, Temel

doi:10.1007/978-981-19-4200-6_20

Cited by 3 publications

(1 citation statement)

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“…The third stage involved semi-automatic processing by means of Agisoft PhotoScan Professional, during which the images were converted into a DSM and digital orthophoto layer with geographic coordinates. In recent literature, the DSM generated for a predominantly woody area is frequently described as a canopy height model (CHM), with the latter being of interest mainly in ecological and biometric studies [60][61][62][63][64]. Given that the methodology employed in converting the raw data into cartographic materials is based on regular, visible-spectrum images (and not LIDAR-type points, which would have generated pre-classified layers, eliminating the need for further corrections), a correction stage was applied to the DSM, in order to remove the arborescent vegetation located on the slope located to the left of the dam breach, which would have generated errors in calculating the area of the breach section and the volume of material removed, as a result of the 1991 flood.…”

Section: Methodsmentioning

confidence: 99%

A Low-Cost, UAV-Based, Methodological Approach for Morphometric Analysis of Belci Lake Dam Breach, Romania

Enea

Iosub

Stoleriu

2023

Water

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The greatest challenges encountered in geospatial studies are related to the availability, accuracy, relevance and cost of the data used. The main mapping techniques currently employed are based on digital data, which are used to create digital elevation models (DEMs). The aim of the present study is to devise and apply methodologies for the generation and validation of high-resolution mapping materials, usable both for local, large-scale analyses, and for the calculation of certain morphometric parameters based on structure from motion (SFM) techniques, applied to images acquired by means of a drone at low cost. As a case study, the ruins of the Belci dam, located in Romania, were analysed, where, with the help of a drone, GIS measurements were performed on the arborescent vegetation of the study area, and a digital terrain model (DTM) of the dam was generated. The costs of such a methodological endeavour are low, which allows for the repetition of the steps involved in devising the maps necessary for such studies on a weekly, seasonal, or annual basis, or after extreme events (floods, landslides etc.). The cartographic materials created in the present study allowed us to calculate the active section of the left earthfill dike of the Belci dam, as well as the volume of material removed by the flood of 1991.

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