scholarly journals In-Field Estimation of Orange Number and Size by 3D Laser Scanning

Agronomy ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 885 ◽  
Author(s):  
Valeriano Méndez ◽  
Antonio Pérez-Romero ◽  
Rubén Sola-Guirado ◽  
Antonio Miranda-Fuentes ◽  
Francisco Manzano-Agugliaro ◽  
...  

The estimation of fruit load of an orchard prior to harvest is useful for planning harvest logistics and trading decisions. The manual fruit counting and the determination of the harvesting capacity of the field results are expensive and time-consuming. The automatic counting of fruits and their geometry characterization with 3D LiDAR models can be an interesting alternative. Field research has been conducted in the province of Cordoba (Southern Spain) on 24 ‘Salustiana’ variety orange trees—Citrus sinensis (L.) Osbeck—(12 were pruned and 12 unpruned). Harvest size and the number of each fruit were registered. Likewise, the unitary weight of the fruits and their diameter were determined (N = 160). The orange trees were also modelled with 3D LiDAR with colour capture for their subsequent segmentation and fruit detection by using a K-means algorithm. In the case of pruned trees, a significant regression was obtained between the real and modelled fruit number (R2 = 0.63, p = 0.01). The opposite case occurred in the unpruned ones (p = 0.18) due to a leaf occlusion problem. The mean diameters proportioned by the algorithm (72.15 ± 22.62 mm) did not present significant differences (p = 0.35) with the ones measured on fruits (72.68 ± 5.728 mm). Even though the use of 3D LiDAR scans is time-consuming, the harvest size estimation obtained in this research is very accurate.

2021 ◽  
Vol 11 (9) ◽  
pp. 3938
Author(s):  
Shusheng Bi ◽  
Chang Yuan ◽  
Chang Liu ◽  
Jun Cheng ◽  
Wei Wang ◽  
...  

By moving a commercial 2D LiDAR, 3D maps of the environment can be built, based on the data of a 2D LiDAR and its movements. Compared to a commercial 3D LiDAR, a moving 2D LiDAR is more economical. A series of problems need to be solved in order for a moving 2D LiDAR to perform better, among them, improving accuracy and real-time performance. In order to solve these problems, estimating the movements of a 2D LiDAR, and identifying and removing moving objects in the environment, are issues that should be studied. More specifically, calibrating the installation error between the 2D LiDAR and the moving unit, the movement estimation of the moving unit, and identifying moving objects at low scanning frequencies, are involved. As actual applications are mostly dynamic, and in these applications, a moving 2D LiDAR moves between multiple moving objects, we believe that, for a moving 2D LiDAR, how to accurately construct 3D maps in dynamic environments will be an important future research topic. Moreover, how to deal with moving objects in a dynamic environment via a moving 2D LiDAR has not been solved by previous research.


Author(s):  
N. U. Mohd Aminuddin ◽  
Z. Majid ◽  
N. Ahmad Fuad ◽  
A. Aspuri ◽  
M. F. Mohd Salleh ◽  
...  

Abstract. In recent years, there has been little adoption of geospatial technology applications towards the archaeological excavation project in Malaysia which yields increasing amount of data on historical assets. Those data however been processed and managed via conventional method of paper form- based and less associated spatial data which is actually can be necessary to improve the finding method of potential archaeological sites. This paper presents the application of Geographical Information System (GIS) towards the archaeology data management by adopting geodatabase for storing archaeology information and visualizing the archaeological monuments via method of 3D Terrestrial Laser Scanning (TLS). The research area is located within the Bujang Valley Archaeological Museum, Merbok, Kedah which known to locate most of the ancient relics that being preserved over time. The TLS method is used to scan the interior and exterior structures of the monuments due to its capability in representing 3D visualization digitally from point cloud data and close to the accuracy of the actual structure. In addition, the geodatabase can provide the organization a better medium to create large-scale databases for organizing, analyzing and sharing the products of the field research with other users. The GIS capability to capture, integrate, store, edit, analyze and display geospatial data can really help the effort in preserving the archaeological information from lost over time.


Sensors ◽  
2014 ◽  
Vol 14 (9) ◽  
pp. 16672-16691 ◽  
Author(s):  
Qingquan Li ◽  
Liang Zhang ◽  
Qingzhou Mao ◽  
Qin Zou ◽  
Pin Zhang ◽  
...  

Science ◽  
2018 ◽  
Vol 361 (6409) ◽  
pp. eaau0137 ◽  
Author(s):  
Marcello A. Canuto ◽  
Francisco Estrada-Belli ◽  
Thomas G. Garrison ◽  
Stephen D. Houston ◽  
Mary Jane Acuña ◽  
...  

Lowland Maya civilization flourished in the tropical region of the Yucatan peninsula and environs for more than 2500 years (~1000 BCE to 1500 CE). Known for its sophistication in writing, art, architecture, astronomy, and mathematics, Maya civilization still poses questions about the nature of its cities and surrounding populations because of its location in an inaccessible forest. In 2016, an aerial lidar survey across 2144 square kilometers of northern Guatemala mapped natural terrain and archaeological features over several distinct areas. We present results from these data, revealing interconnected urban settlement and landscapes with extensive infrastructural development. Studied through a joint international effort of interdisciplinary teams sharing protocols, this lidar survey compels a reevaluation of Maya demography, agriculture, and political economy and suggests future avenues of field research.


2021 ◽  
Vol 6 (1-2) ◽  
pp. 159-176
Author(s):  
Filip Prekop ◽  
Petr Krištuf

This paper presents a new hillfort site which is situated on top of „Čerťák“ Hill (651 m n. m.), Sovolusky municipality, Karlovy Vary district. It has been identified with the help of a digital terrain model based on Airborne Laser Scanning (LiDAR). Two separate lines of stone ramparts have been confirmed on top of the Čerťák Hill, formed by a significant right bank meander in the upper course of the river Střela. The inner area reaches 1.4 ha and the external enclosed area spreads to 2.3 ha. Subsequent field research yielded a collection of more than 500 pottery fragments from the Late Hallstatt period. The dispersion of finds shows relatively intensive settlement. The paper also discusses other sites in the surrounding region which date to the same period. The Hallstatt settlement seems to have been a structurally connected complex in the presented area.


1983 ◽  
Vol 2 (1) ◽  
pp. 3-19 ◽  
Author(s):  
James N. Schubert

Students of biopolitics and others are concerned with the relevance and contribution of this emergent subfield to the traditional or “normal” problems of more established areas in the discipline of political science (Hines, 1982; Blank, 1982). My article addresses this issue by illustrating how ethological methods of inquiry can be applied in research on collective political decision making in small groups. (Watts, 1981). Rather than presenting a final methodology and set of findings fait accompli, my primary purpose is heuristic and developmental-that is, to contribute to critical discussion, awareness, and application of alternative field research methods in political science.


2017 ◽  
Vol 8 (2) ◽  
pp. 477-480 ◽  
Author(s):  
A. F. Colaço ◽  
R. G. Trevisan ◽  
J. P. Molin ◽  
J. R. Rosell-Polo ◽  
A. Escolà

LiDAR (Light detection and ranging) technology is an alternative to current manual methods of canopy geometry estimations in orange trees. The objective of this work was to compare different types of canopy volume estimations of orange trees, some inspired on manual methods and others based on a LiDAR sensor. A point cloud was generated for 25 individual trees using a laser scanning system. The convex-hull and the alpha-shape surface reconstruction algorithms were tested. LiDAR derived models are able to represent orange trees more accurately than traditional methods. However, results differ significantly from the current manual method. In addition, different 3D modeling algorithms resulted in different canopy volume estimations. Therefore, a new standard method should be developed and established.


2017 ◽  
Vol 10 (2) ◽  
pp. 96-106
Author(s):  
Łukasz Zbucki ◽  
Maciej Jędrusik

AbstractSubject and purpose of work: The purpose of the study is to present the perspectives of geotourism development in the porphyry quarry Gorce I, which is situated in the Wałbrzyskie mountains. Currently the exploitation of this quarry is suspended. Materials and methods: This work was written after studying the literature on this subject and conducting field research, during which terrestrial laser scanning (TLS) was used, among others. The material gathered during field research was used, among other things, to create a 3D model of the Gorce I quarry. Results: The research and analyses conducted in the porphyry quarry Gorce I allowed for designating a geotourist trail where information boards were placed. Conclusions: The research conducted in the Gorce I quarry confirms the possibility of utilizing this excavation pit for geotourism purposes.


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