Browsing by Subject "accuracy"

Now showing 1 - 11 of 11

Access status: Open Access ,
Assessing the accuracy of land-based mobile laser scanning data
(2012) Poręba, Martyna; Goulette, François
The quality of collected point cloud is an important matter to make possible their effective use. However, studies concerning the qualification of data obtained from mobile laser scanners are not numerous. For purposes of point clouds analysis, it is possible to define several criteria which provide information about their quality. A synthetic overview of the state of knowledge regarding accuracy assessment is presented in this paper. Afterwards, a methodology adapted to mobile mapping systems evaluation is proposed. The study was aimed to validate received data in terms of accuracy, rather than assess the individual components of the system. The evaluation was conducted in two ways. In the first one, it was achieved through integration with other data sources such as high resolution point clouds from static terrestrial laser scanning as a reference. As a result, an average distanceof 0.185 m in relation to the reference cloud was obtained. On the other hand, a classical Total Station survey of points on building fasade was made. Afterwards, length of various combinations of sections were compared with corresponding sections in mobile point cloud. Finally, assumptions made for both methodologies, their limitations and the experimental results obtained are briefly discussed.
Access status: Open Access ,
Assessing the shallow water habitat mapping extracted from high-resolution satellite image with multi classification algorithms
(Wydawnictwa AGH, 2023) Nandika, Muhammad Rizki; Ulfa, Azura; Ibrahim, Andi; Purwanto, Anang Dwi
Remote sensing technology is reliable in identifying the distribution of seabed cover yet there are still challenges in retrieving the data collection of shallow water habitats than with other objects on land. Classification algorithms based on remote sensing technology have been developed for application to map benthic habitats, such as Maximum Likelihood, Minimum Distance, and Support Vector Machine. This study focuses on examining those three classification algorithms to retrieve information on the benthic habitat in Pari Island, Jakarta using visual interpretation data for classification, and data field measurements for accuracy testing. This study used five classes of benthic objects, namely sand, sand-seagrass, rubble, seagrass, and coral. The results show how the proposed approach in this study provides an overall good classification of marine habitat with an accuracy produced 63.89-81.95%. The Support Vector Machine algorithm produced the highest accuracy rate of about 81.95%. The Support Vector Machine algorithm at a very high spatial resolution is considered to be capable of identifying, monitoring, and performing the rapid assessment of benthic habitat objects.
Access status: Restricted ,
Badanie dokładności pomiarów bezreflektorowych oraz wykorzystanie naziemnego skaningu laserowego do pomiaru kształtu osi obiektu wieżowego
(Data obrony: 2014-09-26) Zarzycki, Mateusz; Zięcina, Joanna
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Restricted ,
Badanie dokładności pomiarów bezreflektorowych oraz wykorzystanie naziemnego skaningu laserowego do pomiaru kształtu osi obiektu wieżowego
(Data obrony: 2014-09-26) Zięcina, Joanna; Zarzycki, Mateusz
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Comparison of the effectiveness of automatic targeting, using systems of ATR type, with manual targeting, based on full test procedure ISO 17123-3
(2010) Owerko, Tomasz; Kuras, Przemysław; Szafarczyk, Anna
The subject of the article is to compare the accuracy of targeting implemented in two manners manual and automatic. The study was conducted based on international standard ISO 17123-3 for two theodolites equipped with the automatic target recognition system. The paper discusses surveying procedure - a full testing procedure, which allows to determine the actual accuracy of the tested instruments. The obtained values are the basis for conducting statistical tests that allow to verify the presented hypothesis.
Access status: Open Access ,
Determination the accuracy of TELPOD SVP 45 resistive sensors as tools for measuring the relative displacement of points
(2012) Ćwiąkała, Paweł; Owerko, Tomasz
Modern measurement technologies allow us to simplify the carrying out of surveys, especially specialist ones. Resistive sensors may prove to be useful during measurements of deformations and strains of structures. These tools allow for the surveying of changes in section lengths and the spacing of expansion gaps. The article will discuss the sensor calibration procedure. In addition, a statistical analysis of the test measurement results of eight sensors of this type will be discussed.
Access status: Open Access ,
Evaluation of Post-Processing Kinematic (PPK) Accuracy in Urban Area in Turgutlu, Manisa, Türkiye
(Wydawnictwa AGH, 2025) Pırtı, Atınç; Yücel, Mehmet Ali
In recent years, global navigation satellite systems (GNSSs) have emerged as a prominent technology for geolocation applications and services in urban settings. Urban environments should also be classified under difficult situations. Densely populated metropolitan areas such as urban centers obstruct the receipt of GNSS signals; these obstacles often result in the congestion of line-of-sight (LOS) signals and give rise to the receipt of diffracted or reflected echoes (often known as the multipath phenomenon). PPK (post-processing kinematic) is a GNSS data-processing method that achieves high-accuracy positioning by correcting errors in raw positioning data. Post-processing is widely used in applications that require precise geospatial information, such as surveying, mapping, and UAV operations. This research aims to evaluate the accuracy of the PPK application method in urban areas. For this aim, surveys were carried out in Turgutlu’s province of Manisa on July 15, 2020, in Türkiye. The analysis compared the PPK surveys’ results with those that were obtained from static surveys. PPK is very effective in difficult situations, but we were likely to encounter certain accuracy problems. Nevertheless, it is worth noting that achieving urban surveys with an accuracy from ±1 cm to ±2 cm may not always be feasible due to the challenging circumstances that might result in more-significant inaccuracies from ±10 cm to ±100 cm for both the horizontal and vertical components.
Access status: Restricted ,
Optymalizacja pomiaru kątów poziomych w zależności od warunków atmosferycznych
(Data obrony: 2015-01-20) Gawenda, Gabriela
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Satellite-Based Urban Heat Island Study: A Prisma-Based Systematic Literature Review
(Wydawnictwa AGH, 2025) Darmawan, Soni; Hernawati, Rika; Rahmani, Shafa
Over the years, urban heat island (UHI) has emerged as a significant contributor to global warming, thereby necessitating considerable attention. Currently, satellite technology is a basic tool for the future – particularly, for its effective and efficient urban analysis. Thus, this study aims to assess the progress of existing satellite-based UHI studies by reviewing scientific publications that were released between 1972 and early 2024. Moreover, we observed that 1991 was a pivotal year, marking the integration of satellite technologies into the development of UHI monitoring and identification systems based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, this review methodology examines the UHI phenomenon by focusing on its characteristics based on sensors, algorithms, and accuracy. The results of the systematic review revealed that Landsat and MODIS were the most-deployed sensors for UHI identification and monitoring, while the land surface temperature (LST) indicator and normalized difference vegetation index (NDVI) were the most-deployed algorithms. Regarding accuracy, the integration of satellite sensors and algorithms into UHI studies provides a promising range of accuracies. The review found that the future of satellite-based UHI monitoring is promising, with technological advancements driving the development of effective techniques such as data fusion, gap filling, machine learning (ML), and deep learning. Additionally, Google Earth Engine (GEE) is a cloud-based platform for performing large-scale geospatial analyses, which facilitates the assessments of local, regional, and global-scale UHIs. Finally, the other review findings for future directions indicated that future satellite-based UHI studies will prioritize six crucial points: enhancing data resolution, integrating satellite data with ground-based sensors, artificial intelligence, and ML, climate change modeling, and a global study of UHIs and their impacts.
Access status: Open Access ,
Some generalized method for constructing nonseparable compactly supported wavelets in L2(R2)
(2013) Banaś, Wojciech
In this paper we show the construction of nonseparable compactly supported bi-variate wavelets. We deal with the dilation matrix $A = \tiny{\left[\begin{matrix}0 & 2 \cr 1 & 0 \cr \end{matrix} \right]}$ and some three-row coefficient mask, that is a scaling function that satisfies a dilation equation with scaling coefficients which can be contained in the set $\{c_{n}\}_{n \in\mathcal{S}},$ where $\mathcal{S}=S_{1} \times \{0,1,2\},$ $S_{1} \subset \mathbb{N},$ $\sharp S_{1} \lt \infty.$
Access status: Open Access ,
The assessment of the influence of cadastral parcel boundary points location errors on the accuracy of analytical determination of their surface area
(2016) Benduch, Piotr
Działka stanowi obiekt wiodący ewidencji gruntów i budynków. Jej nadrzędnym atrybutem przestrzennym są granice określające zasięg prawa własności. Pochodną granic jest pole powierzchni działki, które zgodnie z przepisami obliczane jest na podstawie współrzędnych punktów granicznych. Bazując na wyprowadzonych wzorach oraz na materiałach pozyskanych z ośrodków dokumentacji geodezyjnej i kartograficznej, przeanalizowano podstawowe czynniki wpływające na wartość błędu średniego pola powierzchni działki. Wyniki badań jednoznacznie potwierdziły, że błędy położenia punktów granicznych w sposób istotny wpływają na obniżenie dokładności analitycznego wyznaczenia pola powierzchni. Ważną rolę w tym aspekcie odgrywa także geometria działki, która jest ściśle powiązana z liczbą punktów załamania granic. W praktyce na ostateczną wartość błędu średniego pola powierzchni wpływają wszystkie z rozpatrywanych czynników. Ich sumaryczne oddziaływanie może powodować bardzo negatywne skutki w wielu dziedzinach związanych z gospodarką nieruchomościami. Świadczy to o tym, że dane o granicach działek powinny być pozyskiwane z najwyższą dokładnością, zwłaszcza na terenach zurbanizowanych. Spełnienie tego postulatu przyczyni się do istotnej poprawy szeroko pojętego funkcjonowania ewidencji gruntów i budynków.