scholarly journals Rapid Estimation of Citrus Tree Damage from Hurricanes in Florida Using an Ultrasonic Tree Measurement System

2006 ◽  
Vol 16 (2) ◽  
pp. 339-344 ◽  
Author(s):  
Q.U. Zaman ◽  
A.W. Schumann ◽  
H.K. Hostler
Keyword(s):  
Tree Canopy ◽  
Medium Size ◽  
Volume Loss ◽  
Tall Grass ◽  
Tree Damage ◽  
Citrus Groves ◽  
Canopy Volume ◽  
Before And After ◽  
Ground Truthing ◽  
Partial Tree

Many citrus groves in Florida were affected by hurricanes in Summer 2004. A commercial 42-acre `Valencia' sweet orange (Citrus sinensis) grove of 2980 trees was routinely scanned with an automated ultrasonic system to measure and map tree canopy volumes. We estimated tree damage by comparing canopy volumes measured before and after the hurricanes of 2004. Ultrasonically sensed tree canopy volume was mapped and the relative tree canopy volume loss percentage (TCVL%) for each tree was calculated and classified into six categories [≤0 (no damage), 1% to 24%, 25% to 49%, 50% to 74%, 75% to 99%, and 100%]. Authenticity of the ultrasonically sensed missing trees was established by ground truthing or matching visually observed and georeferenced missing tree locations with ultrasonically sensed missing trees in the grove. Ninety-one trees were found missing during ground inspections after hurricanes and they exactly matched with ultrasonically sensed missing tree locations throughout the grove. All of the missing trees were in TCVL% categories 5 and 6 (≥75% damage). Some canopy volume was still detected with ultrasonics at the missing tree locations because of the presence of tall grass, weeds, or branches of large adjacent trees. More than 50% of trees in the grove were damaged (completely or partially) and generally larger trees (>100 m3) were damaged more by the hurricanes than small or medium size trees in each tree canopy volume loss category. The automated ultrasonic system could be used to rapidly identify missing trees (completely damaged) and to estimate partial tree canopy volume loss after hurricanes.

scholarly journals New tools for old problems — comparing drone- and field-based assessments of a problematic plant species

2021 ◽  
Vol 193 (2) ◽  
Author(s):  
Jens Oldeland ◽  
Rasmus Revermann ◽  
Jona Luther-Mosebach ◽  
Tillmann Buttschardt ◽  
Jan R. K. Lehmann
Keyword(s):  
Image Analysis ◽  
Plant Species ◽  
Just In Time ◽  
Post Processing ◽  
Tall Grass ◽  
Field Surveys ◽  
Distribution Maps ◽  
Object Based Image Analysis ◽  
Object Based ◽  
Before And After

AbstractPlant species that negatively affect their environment by encroachment require constant management and monitoring through field surveys. Drones have been suggested to support field surveyors allowing more accurate mapping with just-in-time aerial imagery. Furthermore, object-based image analysis tools could increase the accuracy of species maps. However, only few studies compare species distribution maps resulting from traditional field surveys and object-based image analysis using drone imagery. We acquired drone imagery for a saltmarsh area (18 ha) on the Hallig Nordstrandischmoor (Germany) with patches of Elymus athericus, a tall grass which encroaches higher parts of saltmarshes. A field survey was conducted afterwards using the drone orthoimagery as a baseline. We used object-based image analysis (OBIA) to segment CIR imagery into polygons which were classified into eight land cover classes. Finally, we compared polygons of the field-based and OBIA-based maps visually and for location, area, and overlap before and after post-processing. OBIA-based classification yielded good results (kappa = 0.937) and agreed in general with the field-based maps (field = 6.29 ha, drone = 6.22 ha with E. athericus dominance). Post-processing revealed 0.31 ha of misclassified polygons, which were often related to water runnels or shadows, leaving 5.91 ha of E. athericus cover. Overlap of both polygon maps was only 70% resulting from many small patches identified where E. athericus was absent. In sum, drones can greatly support field surveys in monitoring of plant species by allowing for accurate species maps and just-in-time captured very-high-resolution imagery.

scholarly journals Phenotyping Architecture Traits of Tree Species Using Remote Sensing Techniques

2021 ◽  
Vol 64 (5) ◽  
pp. 1611-1624
Author(s):  
Worasit Sangjan ◽  
Sindhuja Sankaran
Keyword(s):  
Remote Sensing ◽  
Structure From Motion ◽  
Tree Species ◽  
Tree Height ◽  
Tree Canopy ◽  
System Structure ◽  
List Type ◽  
Canopy Architecture ◽  
Chemical Application ◽  
Canopy Volume

HighlightsTree canopy architecture traits are associated with its productivity and management.Understanding these traits is important for both precision agriculture and phenomics applications.Remote sensing platforms (satellite, UAV, etc.) and multiple approaches (SfM, LiDAR) have been used to assess these traits.3D reconstruction of tree canopies allows the measurement of tree height, crown area, and canopy volume.Abstract. Tree canopy architecture is associated with light use efficiency and thus productivity. Given the modern training systems in orchard tree fruit systems, modification of tree architecture is becoming important for easier management of crops (e.g., pruning, thinning, chemical application, harvesting, etc.) while maintaining fruit quality and quantity. Similarly, in forest environments, architecture can influence the competitiveness and balance between tree species in the ecosystem. This article reviews the literature related to sensing approaches used for assessing architecture traits and the factors that influence such evaluation processes. Digital imagery integrated with structure from motion analysis and both terrestrial and aerial light detection and ranging (LiDAR) systems have been commonly used. In addition, satellite imagery and other techniques have been explored. Some of the major findings and some critical considerations for such measurement methods are summarized here. Keywords: Canopy volume, LiDAR system, Structure from motion, Tree height, UAV.

scholarly journals Cashew Growth and Canopy Dynamics as Influenced by Manuring in a Guinea Savanna Agro-Ecology of Nigeria

2020 ◽  
pp. 80-88
Author(s):  
Beatrice Abanum Nduka ◽  
Olorunfemi Sunday Ojo Akanbi ◽  
Idrisu Mohammed ◽  
Seun Adewale Adeosun ◽  
Osasogie Ugioro ◽  
...  
Keyword(s):  
Block Design ◽  
Organic Fertilizer ◽  
Chemical Properties ◽  
Soil Nutrient ◽  
Ground Cover ◽  
Canopy Development ◽  
Canopy Volume ◽  
Before And After ◽  
Soil Status ◽  
Physical And Chemical

A two-year experiment was conducted to study the response of manuring on growth and canopy development on three-year-old Cashew trees. The experiment was laid in a randomized complete block design, with three replications. Soil characteristics including the chemical and physical properties were analyzed before and after the experiments. Fecti-plus organic pelletized fertilizer was applied at different rates of 0,750.6 and 1,501.2 kg/ha-1 respectively around the circumference of the tree. Before the application, the fertilizer sample was also analyzed. Data collected were plant height, stem girth, canopy dynamics which includes: Canopy diameter, canopy radius, canopy spread (North-South and East-West directions), canopy volume, canopy ground cover and percentage ground cover. The results from the pre soil sample show a relatively low status but were significantly enhanced after the application of the pelletized organic fertilizer (Ferti-plus). The soil nutrient composition of Oc, Om, N, K, Na, Ca and Mg+ was significantly highest in the plots having 1,501.2 kg/ha-1 treatments. Generally, there was a significant increase in the soil nutrient with the addition of pelletized fertilizer in respective of the rate of application. Also the results on the canopy dynamic in terms of canopy volume, spread and diameter revealed better development with the use of 1501.2 kg/ha-1 pelletized fertilizer and significantly different to 750.6 kg/ha-1 and those in the no-manure (control)plots. Meanwhile, the use of pelletized organic fertilizer gave superior growth and canopy development. It also influenced the growth of the Cashew plants, as well as the physical and chemical properties of the soil status.

scholarly journals Seismic and mechanical studies of the artificially triggered rockfall at Mount Néron (French Alps, December 2011)

2014 ◽  
Vol 14 (12) ◽  
pp. 3175-3193 ◽  
Author(s):  
P. Bottelin ◽  
D. Jongmans ◽  
D. Daudon ◽  
A. Mathy ◽  
A. Helmstetter ◽  
...  
Keyword(s):  
Low Frequency ◽  
Free Fall ◽  
Seismic Signal ◽  
Medium Size ◽  
Seismic Arrays ◽  
French Alps ◽  
Before And After ◽  
Remote Sensing Techniques ◽  
Two Phases ◽  
Element Technique

Abstract. The eastern limestone cliff of Mount Néron (French Alps) was the theater for two medium-size rockfalls between summer and winter 2011. On 14 August 2011, a ~2000 m3 rock compartment detached from the cliff, fell 100 m below and propagated down the slope. Although most of the fallen rocks deposited on the upper part of the slope, some blocks of about 15 m in size were stopped by a ditch and an earthen barrier after a run-out of 800 m. An unstable overhanging ~2600 m3 compartment remained attached to the cliff and was blasted on 13 December 2011. During this artificially triggered event, 7 blocks reached the same ditch, with volumes ranging from 0.8 to 12 m3. A semi-permanent seismic array located about 2.5 km from the site recorded the two events, providing a unique opportunity to understand and to compare the seismic phases generated during natural and artificially triggered rockfalls. Both events have signal duration of ~100 s with comparable maximum amplitudes recorded at large distances (computed local magnitude of 1.14 and 1.05, respectively), most of the energy lying below 20 Hz. Remote sensing techniques (photogrammetry and lidar) were employed before and after the provoked rockfall, allowing the volume and fracturing to be characterized. This event was filmed by two video cameras, and the generated ground motions were recorded using two temporary 3C seismic sensors and three seismic arrays deployed at the slope toe. Videos and seismogram processing provided estimates of the propagation velocity during the successive rockfall phases, which ranges from 12 to 30 m s−1. The main seismic phases were obtained from combined video and seismic signal analyses. The two most energetic phases are related to the ground impact of fallen material after free fall, and to individual rock block impacts into the ditch and the earthen barrier. These two phases are characterized by similar low-frequency content but show very different particle motions. The discrete element technique allowed reproducing the key features of the rockfall dynamics, yielding propagation velocities compatible with experimental observations.

Special Issue on 2nd Japan-France Congress on Mechatronics

1995 ◽  
Vol 7 (3) ◽  
pp. 195-195
Author(s):  
Seiji Hata ◽  
Keyword(s):  
Current Status ◽  
Medium Size ◽  
Japan Society ◽  
Special Issue ◽  
Precision Engineering ◽  
Ordinary Life ◽  
The Past ◽  
Poster Sessions ◽  
The World ◽  
Before And After

Following the I st congress in Besancon in 1992, the 2nd Japan-France Congress on Mechatronics was held at Takamatsu City in Japan from November 1 to 3, 1994. The congress was co-sponsored by Kagawa University, the Japan Society for Precision Engineering, and l'Institut des Microtechniques de Franche-Comte. A total of 282 persons participated in the congress, 49 from France, 209 from Japan, and 24 from other countries including China, U.S., Turkey, Korea, and Switzerland. Researchers and engineers from a total of 15 countries participated in the congress. The congress continues to become more international and exciting. There are six sessions at the congress. The session names and the number of the papers belonging to each are as follows: (1) Mechatronics, 33 papers; (2) Robotics, 53 papers; (3) Sensors, 26 papers; (4) Vision, 33 papers; (5) Microelectro Mechanical Systems, 20 papers; and (6) CIM & Systems, 21 papers. The total number of papers 186. Additionally, three keynote speakers discussed the current status and future of the mechatronics technologies. The papers were presented at the oral sessions and the poster sessions. In this special issue, 11 papers from these fields are presented to describe the current technological status in Japan. Takamatsu is charming old city near Osaka. The congress was held at the exhibition center in Intelligent Park in Takamatsu, which was newly developed as the technological center of the area. The congress was held at such a location so that participants from abroad could gain a feel for ordinary life in Japan. In addition to the congress, there were two technical tours before and after the congress. The technical tour to the industries in Takamatsu showed the vivid medium size manufacturers in Japan. It is the another viewpoint contrary to the huge companies of Japan. During the congress, there were warm and friendly technological interactions between Japan and Europe. This should be further encouraged, and more countries should be included in the congress. The 3rd French-Japanese Congress on Mechatronics will be held at Besancon, France in 1996. It will also be the first European-Asia Congress. I hope that many researchers and engineers from all over the world, will participate in the congress and that the warm and friendly atmosphere of the past congress is provided at the next congress.

Growth and yield of clonal guavas in south-eastern Queensland

1986 ◽  
Vol 26 (5) ◽  
pp. 619
Author(s):  
KR Chapman ◽  
B Paxton ◽  
DH Maggs
Keyword(s):  
Fruit Size ◽  
Tree Height ◽  
Tree Canopy ◽  
Tree Size ◽  
Growth And Yield ◽  
Marketable Yield ◽  
Cross Sectional ◽  
South Eastern ◽  
Canopy Volume ◽  
Highly Correlated

Five processing guava clones (GA6- 1, GA7- 12, GA8-30, GA9-35, GA11-56) were tested over 3 cropping years at Nambour, in coastal south-eastern Queensland. Mean marketable yield for the first crop at 2 years of age was 45 kg/tree or 36.23 t/ha at a density of 805 trees/ha. GA11-56, the most acceptable clone for processing, also gave the highest marketable yields of 627, 71.65 and 72.53 t/ha for the first 3 crops. Yield per unit cross sectional area of trunk was a more simple and useful index of yield efficiency than more complex parameters including a fruitfulness index and multiple regressions with yield of north-south canopy spread, number of primary branches and combinations of these and trunk girth. Similarly, trunk - - girth provided at least as good an estimate of tree size as the vigour index. Tree dimension measurements which included east-west canopy spread, north-south canopy spread, tree height, stem height, number of primary branches, crown height, crown radius, tree canopy volume, canopy surface area and an index of crown weight provided no consistent indication of tree size. They were not highly correlated with either accumulated or final yield of the guava. The GA11-56 clone because of its yield, fruit size and other desirable processing characteristics was the only clone that could be recommended for commercial plantings.

Laser, ultrasonic and manual measurements of citrus tree canopy volume

2001 ◽  
Author(s):  
S. D. Tumbo ◽  
M. Salyani ◽  
J. D. Whitney ◽  
T. A. Wheaton ◽  
W. M. Miller
Keyword(s):  
Tree Canopy ◽  
Citrus Tree ◽  
Laser Ultrasonic ◽  
Canopy Volume

scholarly journals Indicator Crop Bioassays to Define Citrus Productivity in Sandy Soils

HortScience ◽  
2010 ◽  
Vol 45 (12) ◽  
pp. 1859-1865 ◽  
Author(s):  
Kirandeep K. Mann ◽  
Arnold W. Schumann ◽  
Thomas A. Obreza ◽  
Jerry B. Sartain
Keyword(s):  
Root Zone ◽  
Digital Camera ◽  
Soil Samples ◽  
Shoot Length ◽  
Tree Canopy ◽  
Nutrient Concentrations ◽  
Citrus Grove ◽  
Canopy Volume ◽  
Weed Cover ◽  
Citrus Production

Citrus production in Florida is commonly affected by a high degree of spatial variability of soils. Therefore, this study developed rapid indicator crop bioassays to evaluate the relationships between indicator crops and citrus production at various soil depths. A citrus grove was divided into five productivity zones based on existing tree canopy volume using GIS software (“very poor,” “poor,” “medium,” “good,” and “very good”). Visual ratings of percentage cover were collected from each zone using a 1-m2 quadrant. Six random soil samples were collected between the tree rows from each productivity zone at four depths (0 to 15, 15 to 30, 30 to 45, and 45 to 60 cm). Greenhouse bioassay experiments used sorghum and radish crops grown in soil sampled from four depths. Overhead photographs of potted radish plants were captured periodically with a SLR digital camera to calculate leaf area by image processing. Shoot weights, shoot length, root weights, and leaf nutrient concentrations were measured at harvest (56 and 21 days after germination for sorghum and radish, respectively). Germination, shoot length, and shoot weight of sorghum and radish were significantly affected by the productivity zone. Sorghum (0 to 30 cm), radish (0 to 45 and 0 to 60 cm) and weed cover were strongly correlated (r ≈0.50 to 0.60***) with citrus yield and canopy volume at the lower two depths. The strong relationships (r > 0.50***) of sorghum and radish shoot weights and weed cover with soil properties at greater depths demonstrated the important role of cumulative root zone depth of 60 cm in differentiating citrus productivity. These results revealed that citrus production in poor areas of the grove was limited by the shallow depth of productive soil, and citrus productivity could be successfully mapped using indicator crop bioassays with soil samples taken at multiple depths.

scholarly journals Testing the Stability of Drug Resistance on Cryopreserved, Gene-Engineered Human Induced Pluripotent Stem Cells

2021 ◽  
Vol 14 (9) ◽  
pp. 919
Author(s):  
Dilaware Khan ◽  
Ann-Christin Nickel ◽  
Sebastian Jeising ◽  
Constanze Uhlmann ◽  
Sajjad Muhammad ◽  
...  
Keyword(s):  
Stem Cells ◽  
Drug Development ◽  
Induced Pluripotent Stem Cells ◽  
Pluripotent Stem Cells ◽  
Medium Size ◽  
Long Term Storage ◽  
Before And After ◽  
In Vitro Pharmacology ◽  
Induced Pluripotent

Human induced pluripotent stem cells (hiPSCs) have emerged as a powerful tool for in vitro modelling of diseases with broad application in drug development or toxicology testing. These assays usually require large quantities of hiPSC, which can entail long-term storage via cryopreservation of the same cell charges. However, it is essential that cryopreservation does not oppose durable changes on the cells. In this project, we characterize one parameter of functionality of one that is well established in the field, in a different research context, an applied hiPSC line (iPS11), namely their resistance to a medium size library of chemo interventions (>160 drugs). We demonstrate that cells, before and after cryopreservation, do not change their relative overall drug response phenotypes, as defined by identification of the top 20 interventions causing dose-dependent reduction of cell growth. Importantly, also frozen cells that are exogenously enforced for stable overexpression of oncogenes myelocytomatosis (cMYC) or tumor protein 53 mutation (TP53R175H), respectively, are not changed in their relative top 20 drugs response compared to their non-frozen counterparts. Taken together, our results support iPSCs as a reliable in vitro platform for in vitro pharmacology, further raising hopes that this technology supports biomarker-associated drug development. Given the general debate on ethical and economic problems associated with the reproducibly crisis in biomedicine, our results may be of interest to a wider audience beyond stem cell research.

scholarly journals Ultrastructural analysis of the surface of stainless steel endodontic instruments before and after use

2014 ◽  
Vol 61 (4) ◽  
pp. 175-182
Author(s):  
Jelena Popovic ◽  
Jovanka Gasic ◽  
Slavoljub Zivkovic ◽  
Aleksandar Mitic ◽  
Marija Nikolic ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Manufacturing Process ◽  
Surface Defects ◽  
Sem Analysis ◽  
Medium Size ◽  
Clinical Preparation ◽  
Before And After ◽  
Maxillary Premolars ◽  
Single Use ◽  
Clinical Conditions

Introduction. Although many studies have reported various advantages of nickel-titanium endodontic instruments, the use of stainless steel endodontic files still presents a standard in everyday practice. The aim of this study was to evaluate ultrastructure of the surface of stainless steel endodontic instruments before and after their use. Material and Methods. Fourteen sets of non-used stainless steel endodontic reamers and files were included in the study. Each set of instruments was used one, three or six times in simulated clinical conditions on extracted maxillary premolars. After their use the instruments were subjected to cleaning and sterilization procedures. Ultrastructure of the surface of instruments was observed under scanning electron microscope (SEM). Surface analysis was performed based on the number of uses and size of instruments. The following characteristics were analyzed: defects of instrument flutes, defects of cutting edges and instrument deformations. Results. SEM analysis showed defects on the surface of non-used instruments as a result of the manufacturing process. Surface defects, defects of cutting edges as well as flutes deformations were observed after a single use and were more often noticed in small sized instruments. After three uses, flutes deformations were observed in all small sized instruments and some of the medium size. After six uses all groups of instruments showed defects of cutting edges. Conclusion. Non-used stainless steel endodontic instruments showed surface defects created by the manufacturing process. Defects of cutting edges and flutes can be observed after a single use. To minimize complications and mistakes during clinical preparation it is recommended to limit the number of instrument uses.

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