Factors Influencing the Accuracy of Shallow Snow Depth Measured Using UAV-Based Photogrammetry
نویسندگان
چکیده
Factors influencing the accuracy of UAV-photogrammetry-based snow depth distribution maps were investigated. First, UAV-based surveys performed on 0.04 km2 snow-covered study site in South Korea for 37 times over period 13 days under 16 prescribed conditions composed various photographing times, flight altitudes, and photograph overlap ratios. Then, multi-temporal Digital Surface Models (DSMs) area covered with shallow obtained using digital photogrammetric techniques. Next, created by subtracting snow-free DSM from DSMs area. these UAV-Photogrammetry-based compared to situ measurements at 21 locations. The each quantified terms bias (median residuals, QΔD) precision (the Normalized Median Absolute Deviation, NMAD). Lastly, factors performance metrics results are as follows: (1) QΔD NMAD eight optimal condition (50 m altitude 80% ratio) ranged −2.30 cm 5.90 1.78 4.89 cm, respectively. best survey case had NMAD; (2) Lower UAV greater lower QΔD; (3) Greater number Ground Control Points (GCPs) lowers (4) Spatial configuration GCP coordinates influenced map; (5) tie-points leads higher accuracy; (6) Smooth fresh cover did not provide many tie-points, either resulting a significant error or making entire photogrammetry process impossible.
منابع مشابه
Estimating the Rut Depth by UAV Photogrammetry
The rut formation during forest operations is an undesirable phenomenon. A methodology is being proposed to measure the rut depth distribution of a logging site by photogrammetric point clouds produced by unmanned aerial vehicles (UAV). The methodology includes five processing steps that aim at reducing the noise from the surrounding trees and undergrowth for identifying the trails. A canopy he...
متن کاملA Simple and Empirical Refraction Correction Method for UAV-Based Shallow-Water Photogrammetry
The aerial photogrammetry of shallow water bottoms has the potential to be an efficient high-resolution survey technique for shallow water topography, thanks to the advent of convenient UAV and automatic image processing techniques Structure-from-Motion (SfM) and Multi-View Stereo (MVS)). However, it suffers from the systematic overestimation of the bottom elevation, due to the light refraction...
متن کاملTropical Peatland Burn Depth and Combustion Heterogeneity Assessed Using UAV Photogrammetry and Airborne LiDAR
متن کامل
factor influencing the adoption of internet banking
دوره مشترک کارشناسی ارشد بازاریابی و تجارت الکترونیک دانشگاه تربیت مدرس_ دانشگاه تکنولوژی lule? چکیده پایان نامه عوامل موثر بر پذیرش اینترنت بانک توسط مشتریان پیشرفت فناوری اطلاعات و ارتباطات و به طور خاص رشد اینترنت جهت تراکنش های معاملات بازرگانی، تاثیر بسیار عمیقی در صنعت بانکداری داشته است.این در حالی ست که نفوذ بانکداری اینترنتی در کشورهای در حال توسعه بسیار کندتر از نفوذ آن ...
15 صفحه اولUav Photogrammetry: Block Triangulation Comparisons
UAVs systems represent a flexible technology able to collect a big amount of high resolution information, both for metric and interpretation uses. In the frame of experimental tests carried out at Dept. ICA of Politecnico di Milano to validate vector-sensor systems and to assess metric accuracies of images acquired by UAVs, a block of photos taken by a fixed wing system is triangulated with sev...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Remote Sensing
سال: 2021
ISSN: ['2315-4632', '2315-4675']
DOI: https://doi.org/10.3390/rs13040828