RADIOCARBON AND DENDROCHRONOLOGY APPLIED IN A LEGAL DISPUTE: A CASE FROM COLOMBIA

Radiocarbon ◽  
2020 ◽  
pp. 1-9
Author(s):  
Jorge I del Valle ◽  
Jorge A Giraldo
Keyword(s):  
Power Line ◽  
Growth Rings ◽  
Teak Plantation ◽  
Bomb Radiocarbon ◽  
One Year ◽  
Power Line Corridor

ABSTRACT In 2015 a dispute arose between an electricity company (EC) and smallholder of a teak plantation when the EC felled 80 trees (without consent of the owner) in a linear transect under a rural power-line-corridor (PLC), fragmenting the teak stand in two portions. The EC stated that there were no planted trees in the area when the PLC was established in 2008. The owner asserted he planted the stand in 2006 so in 2008 the company should have seen the planted trees. We used the bomb radiocarbon (14C) signal of three felled trees and dendrochronological dating of five trees, three felled by the EC and two felled by us in 2016, to do this study to determine the age. We found that the first growth rings were dated to 2005 both in the trees felled by the EC in 2015 and felled by us in 2016, one year before that reported by the owner (2006). This year corresponds to the wood present in the cuttings during the stand’s planting year. These facts are in agreement with the owner’s testimony. The plantation was 10 years old in 2015.

UAV Low Altitude Photogrammetry for Power Line Inspection

2016 ◽  
Author(s):  
Yong Zhang ◽  
Xiuxiao Yuan ◽  
Yi Fang ◽  
Shiyu Chen
Keyword(s):  
Transmission Lines ◽  
Three Dimensional ◽  
Digital Camera ◽  
Point Clouds ◽  
Power Line ◽  
Epipolar Line ◽  
3D Point Clouds ◽  
Low Altitude ◽  
Power Line Corridor ◽  
Safety Inspections

When the distance between an obstacle and a power line is less than the discharge distance, a discharge arc can be generated, resulting in interruption of power supplies. Therefore, regular safety inspections are necessary to ensure safe operations of power grids. Tall vegetation and buildings are the key factors threatening the safe operation of extra high voltage transmission lines within a power line corridor. Manual or LiDAR based-inspections are time consuming and expensive. To make safety inspections more efficient and flexible, a low-altitude unmanned aerial vehicle remote-sensing platform equipped with optical digital camera was used to inspect power line corridors. We propose a semi-patch matching algorithm based on epipolar constraints using both correlation coefficient and the shape of its curve to extract three dimensional (3D) point clouds for a power line corridor. Virtual photography was used to transform the power line direction from approximately parallel to the epipolar line to approximately perpendicular to epipolar line to improve power line measurement accuracy. The distance between the power lines and the 3D point cloud is taken as a criterion for locating obstacles within the power line corridor automatically. Experimental results show that our proposed method is a reliable, cost effective and applicable way for practical power line inspection, and can locate obstacles within the power line corridor with measurement accuracies better than ±0.5 m.

Air temperatures in a power line corridor over 10 years following afforestation with Eucalyptus globulus

2010 ◽  
Vol 103 (3-4) ◽  
pp. 281-290
Author(s):  
J. A. Rodríguez-Suárez ◽  
B. Soto ◽  
R. Perez ◽  
F. Diaz-Fierros
Keyword(s):  
Eucalyptus Globulus ◽  
Power Line ◽  
Air Temperatures ◽  
Power Line Corridor

SIZES, DISTRIBUTIONS, AND NUMBERS OF VERTICAL RESIN DUCTS IN LODGEPOLE PINE

1966 ◽  
Vol 44 (4) ◽  
pp. 519-525 ◽  
Author(s):  
R. W. Reid ◽  
J. A. Watson
Keyword(s):  
Radial Growth ◽  
Photographic Method ◽  
Direct Relation ◽  
Growth Rings ◽  
Resin Ducts ◽  
Resin Duct ◽  
Large Numbers ◽  
Summer Temperatures ◽  
One Year ◽  
Pinns Contorta

Methods are described for easy detection of vertical resin ducts in Pinns contorta Dougl. var. latifolia Engelm. Also a photographic method for determining the area and circumference of growth rings is described. The time of vertical resin duct formation was the same in both slow- and fast-growing trees. Vertical ducts seldom occurred in radial alignment in consecutive years. The diameters of vertical ducts varied from 60 to 105 μ and were least near the pith; lengths ranged from 3.8 to 43.2 cm in a 75-year-old tree and 1.2 to 12.0 cm in a 30-year-old tree. Wide variations occurred in the abundance of vertical ducts between years. Their presence in large numbers in one year appeared to influence their abundance in the following year. The fluctuations in number occurred simultaneously in all trees examined. Radial growth was not associated with these fluctuations. There was circumstantial evidence for a direct relation between high summer temperatures, large cone crops, and large numbers of vertical ducts.

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