scholarly journals Estimation of aboveground biomass using aerial photogrammetry from unmanned aerial vehicle in teak (Tectona grandis) plantation in Thailand

2020 ◽  
Vol 21 (6) ◽  
Author(s):  
SASIWIMOL RINNAMANG ◽  
KAMPANART SIRIRUEANG ◽  
SORAVIS SUPAVETCH ◽  
PONTHEP MEUNPONG
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aboveground Biomass ◽  
Tree Height ◽  
Tectona Grandis ◽  
Aerial Images ◽  
P Value ◽  
Total Biomass ◽  
Aerial Photogrammetry ◽  
Aerial Vehicles ◽  
Ground Truthing

Abstract. Rinnamang S, Sirirueang K, Supavetch S, Meunpong P. 2020. Estimation of aboveground biomass using aerial photogrammetry from unmanned aerial vehicles in teak (Tectona grandis) plantation in Thailand. Biodiversitas 21: 2369-2376. Thailand is one of the best teak planting locations in the world. Teak is one of the most species planting and a significant source of high-value timber in Thailand. For plantation management, biomass is one of the important factors while determining the production of a plantation and also for sustainable forest management. Unmanned Aerial Vehicles (UAV) have the ability to produce 3D RGB digital images which can be used to study the plantation characteristics. This study aimed to use aerial images and photogrammetry techniques derived from unmanned aerial vehicles (UAV) to estimate teak biomass in Thong Pha Phum plantation, Kanchanaburi Province, Thailand. We conducted our study on 15-and 36-year-old teak stands, and compared the tree dimension between data obtained from field measurement and that from aerial images and photogrammetry techniques. In the 15-year-old stand, the average tree height estimated from the UAV and ground-truthing were 12.34 and 13.06 m, respectively. In the 36-year-old stand, the average tree height from the UAV and ground-truthing were 28.87 and 29.39 m, respectively. We found that in both stands, the difference between data generated from the UAV and ground-truthing data was not significant (p-value = 0.07 and 0.306, respectively). There was also a strong correspondence between tree height estimated from the UAV and that measured on the ground which is indicated by the high R2 (i.e. 0.70 and 0.64 for the 15-and 36-year-old stands, respectively). Using UAV generated data, the total biomass of 15-and 36-year-old stands was estimated to be around 42.07 t ha-1 and 67.13 t ha-1, respectively. The overall results suggest that UAV can be used as an effective tool to survey and monitor stand’s productivity in teak plantation.

scholarly journals Evaluation of Unmanned Aerial Vehicles (UAV) as a Tool to Predict Biomass and Carbon of Tectona grandis in Silvopastoral Systems (SPS) in Costa Rica

Drones ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 47
Author(s):  
Javier Hernández-Cole ◽  
Edgar Ortiz-Malavassi ◽  
Roger Moya ◽  
Olmán Murillo
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aboveground Biomass ◽  
Field Data ◽  
Tectona Grandis ◽  
Average Diameter ◽  
Silvopastoral Systems ◽  
Silvopastoral System ◽  
Crown Diameter ◽  
Breast Height ◽  
Aerial Vehicles

The main objective of this research was to evaluate the use of unmanned aerial vehicles (UAVs) in estimating the aboveground biomass and carbon, and the dasometric characteristics at three different spacings (2.5 m × 1.0 m, 2.5 m × 2.0 m and 2.5 m × 3.0 m) in a silvopastoral system (SPS) for the biomass production of Tectona grandis. A total of 90 trees were sampled, 63 of which were used to perform a dasometric evaluation (vertical and horizontal) in a spacing test in an SPS, and the rest to evaluate the use of UAVs in estimating the aboveground biomass in the spacing test. The results showed significant differences in average diameter at breast height (dbh) between spacings, and in aboveground biomass per tree. The amount of aboveground biomass and carbon per hectare increases at smaller spacings, but the differences were not statistically significant. A logarithmic model was prepared to estimate the dbh based on the crown diameter from the data collected taken in the field, since estimating this variable by means of UAVs is difficult. Significant differences were found in the aboveground biomass estimated using the field data compared to UAV data. The estimation of the crown diameter of the selected trees, hindered by the canopy closure in the SPS, was not adequate, which could influence the amount of aboveground biomass estimated using UAV data.

Automatic detection of potential mosquito breeding sites from aerial images acquired by unmanned aerial vehicles

2021 ◽  
Vol 90 ◽  
pp. 101692
Author(s):  
Daniel Trevisan Bravo ◽  
Gustavo Araujo Lima ◽  
Wonder Alexandre Luz Alves ◽  
Vitor Pessoa Colombo ◽  
Luc Djogbénou ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Automatic Detection ◽  
Aerial Images ◽  
Breeding Sites ◽  
Aerial Vehicles ◽  
Mosquito Breeding

A New Quasi-Steady In-Ground Effect Model for Rotorcraft Unmanned Aerial Vehicles

2019 ◽  
Author(s):  
Xiang He ◽  
Kam K. Leang
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Ground Plane ◽  
Ground Effect ◽  
P Value ◽  
Model Parameters ◽  
Blade Element Theory ◽  
Aerial Vehicles ◽  
Effect Model ◽  
3D Printed ◽  
Induced Velocity

Abstract This paper introduces a new quasi-steady in-ground effect model for rotorcraft unmanned aerial vehicles to predict the aerodynamic behavior when the vehicle’s rotors approach ground plane. The model assumes that the compression of the outflow due to the presence of ground plane induces a change in the induced velocity that can drastically affect the thrust and power output. The new empirical model describes the change in thrust as a function of the distance to an obstacle for a rotor in hover condition. Using blade element theory and the method of image, the model parameters are described in terms of the rotor pitch angle and solidity. Experiments with off-the-shelf, fixed-pitch propellers and 3D-printed variable pitch propellers are carried out to validate the model. Experimental results suggest good agreement with 9.5% root-mean-square error (RMSE) and 97% p-value of statistic significance.

scholarly journals POST-FIRE FORESTRY RECOVERY MONITORING USING HIGH-RESOLUTION MULTISPECTRAL IMAGERY FROM UNMANNED AERIAL VEHICLES

2019 ◽  
Vol XLII-3/W8 ◽  
pp. 301-305 ◽  
Author(s):  
L. Pádua ◽  
T. Adão ◽  
N. Guimarães ◽  
A. Sousa ◽  
E. Peres ◽  
...  
Keyword(s):  
High Resolution ◽  
Unmanned Aerial Vehicles ◽  
Tree Height ◽  
Ground Truth ◽  
Cost Effective ◽  
Forest Disturbances ◽  
Ground Truth Data ◽  
High Resolution Data ◽  
Aerial Vehicles ◽  
Fire Scenarios

<p><strong>Abstract.</strong> In recent years unmanned aerial vehicles (UAVs) have been used in several applications and research studies related to environmental monitoring. The works performed have demonstrated the suitability of UAVs to be employed in different scenarios, taking advantage of its capacity to acquire high-resolution data from different sensing payloads, in a timely and flexible manner. In forestry ecosystems, UAVs can be used with accuracies comparable with traditional methods to retrieve different forest properties, to monitor forest disturbances and to support disaster monitoring in fire and post-fire scenarios. In this study an area recently affected by a wildfire was surveyed using two UAVs to acquire multi-spectral data and RGB imagery at different resolutions. By analysing the surveyed area, it was possible to detect trees, that were able to survive to the fire. By comparing the ground-truth data and the measurements estimated from the UAV-imagery, it was found a positive correlation between burned height and a high correlation for tree height. The mean NDVI value was extracted used to create a three classes map. Higher NDVI values were mostly located in trees that survived that were not/barely affected by the fire. The results achieved by this study reiterate the effectiveness of UAVs to be used as a timely, efficient and cost-effective data acquisition tool, helping for forestry management planning and for monitoring forest rehabilitation in post-fire scenarios.</p>

Methodology in the use of UAV ( Unmanned Aerial Vehicles ) by Assetto del Territorio sector of Liguria Region.

2020 ◽  
Author(s):  
Davide Schenone ◽  
Bottero Daniele ◽  
Mariano Strippoli
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Spare Parts ◽  
Ease Of Use ◽  
Consumer Market ◽  
Aerial Photogrammetry ◽  
Maximum Resolution ◽  
Aerial Vehicles ◽  
Medium Resolution ◽  
Two Sectors ◽  
Terrestrial Photogrammetry

&lt;p&gt;Title: Methodology in the use of UAV ( Unmanned Aerial Vehicles ) by Assetto del Territorio sector of Liguria Region.&lt;/p&gt;&lt;p&gt;Authors:&amp;#160;Davide&amp;#160;Schenone&amp;#160;, Daniele Bottero, Mariano Strippoli.&lt;/p&gt;&lt;p&gt;Liguria&amp;#160;Region&amp;#160;has recently equipped itself with a UAV (&amp;#160;Unmanned&amp;#160;Aerial&amp;#160;Vehicles&amp;#160;) system, consisting of a DJI&amp;#160;Phantom&amp;#160; 4 pro, the choice fell on this type of equipment as it guarantees a good quality for photographic shooting combined with an ease of use deriving from the fact of being designed for a consumer market, in fact this model mounts advanced anti-collision systems on board which make it safe to use even in closed places or near tall trees, the latter being a frequent situation in the use carried out by regional technicians.&lt;/p&gt;&lt;p&gt;In addition, maintenance is facilitated as spare parts (essentially batteries and propellers) can be found easily on the main online sites, given the widespread use of the model.&lt;/p&gt;&lt;p&gt;The use of the drone by the Assetto del Territorio consists mainly of two sectors, terrestrial photogrammetry and aerial photogrammetry.&lt;/p&gt;&lt;p&gt;The intervention scenarios are essentially of two types, survey of existing situations, for example, delimitation of landslides that may or may not have evolved, or the survey of post-disaster situations, both hydraulic and&amp;#160;gravitational&amp;#160;, it is also possible monitor the evolution of phenomena through&amp;#160;multitemporal&amp;#160;recovery&amp;#160;.&lt;/p&gt;&lt;p&gt;The terrestrial photogrammetry it is so far little used by the Region and regarding&amp;#160; the capture of perspective images of buildings, cliffs useful for the relief&amp;#160;geomechanical&amp;#160;to evaluate rock mass, paleoseismic trenches (for upthrow of fault) etc.&lt;/p&gt;&lt;p&gt;As for&amp;#160;the method of data acquisition (images), and the preparation of the flight plan, the DJI GS PRO software for iOS operating systems is used, this software allows to&amp;#160;automatically&amp;#160;set&amp;#160;the flight parameters, simply by drawing on a map the polygon of the area to be surveyed and the flight height, it is also possible to adapt the orientation of the strips to the polygon of the survey.&lt;/p&gt;&lt;p&gt;However, this software does not require the use of a&amp;#160;DTM&amp;#160;, which takes into account the elevation of the terrain, so in case of relief of slope portions inclined taken the take off from the highest point since the calculation of the frames overlap is carried out assuming&amp;#160;that&amp;#160;the ground&amp;#160;is&amp;#160;flat&amp;#160;, if it were not so taking off for example in the lower part it could happen that for purely geometric issues in the top part the overlapping of the frames&amp;#160;is&amp;#160;insufficient to arrive at a correct processing via software.&lt;/p&gt;&lt;p&gt;As regards the processing of immage&amp;#160;in order to produce a cloud, depending on the cases of the DTM points and l '&amp;#160;orthophotos&amp;#160;the software is normally used&amp;#160;Metashape&amp;#160;by&amp;#160;Agisoft&amp;#160;, the&amp;#160;workflow&amp;#160;typically used is this:&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;ul&gt;Adding photos&lt;/ul&gt;&lt;ul&gt;Alignment of photos - maximum resolution&lt;/ul&gt;&lt;ul&gt;Point&amp;#160;cloud&amp;#160;creation&amp;#160;- medium resolution&lt;/ul&gt;&lt;ul&gt;DEM creation&lt;/ul&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;

scholarly journals Graphic Applications of Unmanned Aerial Vehicles (UAVs) in the Study of Industrial Heritage Assets

2020 ◽  
Vol 10 (24) ◽  
pp. 8821
Author(s):  
Sergio Martín-Béjar ◽  
Juan Claver ◽  
Miguel A. Sebastián ◽  
Lorenzo Sevilla
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Sugar Cane ◽  
Irrigation Water ◽  
Aerial Images ◽  
Indirect Measurements ◽  
Industrial Heritage ◽  
Aerial Vehicles ◽  
Wide Range ◽  
Water Pond ◽  
Conventional Systems

As a typology of cultural heritage, a wide range of singularities must to be taken into account when analysing industrial heritage assets. Graphical resources have been usually employed in heritage assets research. Nowadays, Unmanned Aerial Vehicles (UAVs) offer the possibility to obtain images of complex and difficult access areas that cannot be observed on the ground. Furthermore, aerial images allow to analyse heritage assets as a whole. Therefore, in this work, different photographs and videos has been carried out in the San Joaquin sugar cane factory and in the Aguila aqueduct, located in Nerja (Spain). These images have been used to analyse both assets as a set. Different indirect measurements on the factory chimney and irrigation water pond were taken. A Strengths, Weaknesses, Opportunities, and Threats (SWOT) about the use of UAV graphic applications in heritage assets was developed. Finally, the possibilities of conventional photograph technologies and UAV application were compared. Using UAVs allows more image acquisition possibilities than conventional systems. However, both technologies can be complemented and applied together when analysing heritage assets.

scholarly journals Photogrammetric Acquisitions in Diverse Archaeological Contexts Using Drones: Background of the Ager Mellariensis Project (North of Córdoba-Spain)

Drones ◽  
2020 ◽  
Vol 4 (3) ◽  
pp. 47 ◽  
Author(s):  
Massimo Gasparini ◽  
Juan Carlos Moreno-Escribano ◽  
Antonio Monterroso-Checa
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Technological Innovation ◽  
User Experience ◽  
Archaeological Sites ◽  
Publicly Funded ◽  
End User ◽  
Aerial Photogrammetry ◽  
Aerial Vehicles ◽  
Scientific Fields ◽  
Funded Research Project

Unmanned aerial vehicles (UAVs) and aerial photogrammetry have greatly contributed to expanding research in scientific fields that employ geomatics techniques. Archaeology is one of the sciences that has advanced most as a result of this technological innovation. The geographic products obtained by UAV photogrammetric surveys can detect anomalies corresponding to ancient settlements and aid in designing future archaeological interventions. These acquisitions also offer attractive scientific dissemination products. We present five archaeological sites from different ages located in the Guadiato Valley of Córdoba, Spain, where a series of photogrammetric images were acquired for purposes of both research and dissemination. Acquisitions were designed based on the accessibility of the sites and on the end-user experience. The results present several photogrammetric products for use in research, and the mandatory dissemination of the results of a publicly-funded research project.

The nested k-means method: A new approach for detecting lost persons in aerial images acquired by unmanned aerial vehicles

2017 ◽  
Vol 34 (8) ◽  
pp. 1395-1406 ◽  
Author(s):  
Tomasz Niedzielski ◽  
Mirosława Jurecka ◽  
Magdalena Stec ◽  
Małgorzata Wieczorek ◽  
Bartłomiej Miziński
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aerial Images ◽  
New Approach ◽  
Aerial Vehicles

scholarly journals Using Unmanned Aerial Vehicles (UAV) for mornitoring the construction progress of Ho Chi Minh City urban railway project

2015 ◽  
Vol 18 (2) ◽  
pp. 104-112
Author(s):  
Nhat Huu Nguyen ◽  
Tam Minh Dao ◽  
Trung Van Le ◽  
Chon Trung Le
Keyword(s):  
High Resolution ◽  
Unmanned Aerial Vehicles ◽  
Aerial Images ◽  
3D Objects ◽  
Ground Control Points ◽  
Aerial Vehicles ◽  
High Resolution Imagery ◽  
Gis Data ◽  
High Flexibility ◽  
Railway Construction Project

This paper describes a new approach for monitoring the construction progress of the Urban Railway Construction Project “Metro line1 - Ben Thanh - Suoi Tien” by using Unmanned Aerial Vehicles (UAV) to capture high resolution imagery at different stages of the project. The advantage of the AscTec Falcon 8 systems lies in their high flexibility and efficiency in capturing the surface of an area from a low flight altitude. In addition, further information such as orthoimages, elevation models and 3D objects can easily be processed by Pix4Dmapper software. The Ground Control Points (GCPs) and GIS data were used to compare the achieved accuracy of UAV method. This study shows the feasibility of using an UAV system for acquiring the high resolution aerial images and the new opportunities for managing construction progress over time.

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