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Articles 181 - 184 of 184
Full-Text Articles in Life Sciences
A Comparison Of Two Open Source Lidar Surface Classification Algorithms, Wade T. Tinkham, Hongyu Huang, Alistair M. S. Smith, Rupesh Shrestha, Michael J. Falkowski, Andrew T. Hudak, Et Al.
A Comparison Of Two Open Source Lidar Surface Classification Algorithms, Wade T. Tinkham, Hongyu Huang, Alistair M. S. Smith, Rupesh Shrestha, Michael J. Falkowski, Andrew T. Hudak, Et Al.
Michigan Tech Publications
With the progression of LiDAR (Light Detection and Ranging) towards a mainstream resource management tool, it has become necessary to understand how best to process and analyze the data. While most ground surface identification algorithms remain proprietary and have high purchase costs; a few are openly available, free to use, and are supported by published results. Two of the latter are the multiscale curvature classification and the Boise Center Aerospace Laboratory LiDAR (BCAL) algorithms. This study investigated the accuracy of these two algorithms (and a combination of the two) to create a digital terrain model from a raw LiDAR point …
Maintenance Of Genetic Diversity In Cordia Africana Lam., A Declining Forest Tree Species In Ethiopia, Abayneh Derero, Oliver Gailing, Reiner Finkeldey
Maintenance Of Genetic Diversity In Cordia Africana Lam., A Declining Forest Tree Species In Ethiopia, Abayneh Derero, Oliver Gailing, Reiner Finkeldey
Michigan Tech Publications
We assessed genetic variation in a total of 22 populations of the tree species Cordia africana Lam. in Ethiopia and analyzed the country-wide impact of population history, forest disturbance and alteration of land use on extant intraspecific diversity. Amplified Fragment Length Polymorphisms (AFLPs) and chloroplast microsatellite markers were investigated. The analyses of the AFLP data revealed high diversity in all investigated populations: the percentage of polymorphic loci (PPL) ranged from 62.2% to 92.2% and Nei's gene diversity from 0.220 to 0.320 within the populations. The mean PPL and the mean diversity within populations were 85.7% and 0.287, respectively. The analysis …
Transferability Of Simple Sequence Repeat (Ssr) Markers Developed In Litchi Chinensis To Blighia Sapida (Sapindaceae), Marius R.M. Ekué, Oliver Gailing, Reiner Finkeldey
Transferability Of Simple Sequence Repeat (Ssr) Markers Developed In Litchi Chinensis To Blighia Sapida (Sapindaceae), Marius R.M. Ekué, Oliver Gailing, Reiner Finkeldey
Michigan Tech Publications
Ackee (Blighia sapida, Sapindaceae) is a multipurpose fruit tree species of high economic importance, native to the Guinean forests of West Africa, and belongs to the same family as that of lychee (Litchi chinensis). In this study, a set of 12 primer pairs for simple sequence repeats (SSRs) previously developed for lychee has been evaluated for polymorphism in 16 ackee trees from different populations. Seven primer pairs have been found to be transferable, and four have revealed polymorphisms. However, the average number of alleles per locus has dropped from 4.9 for lychee to 3.7 for ackee. Characterization of the four …
A Method For Digital Color Analysis Of Spalted Wood Using Scion Image Software, Sara Robinson, Peter Laks, Ethan J. Turnquist
A Method For Digital Color Analysis Of Spalted Wood Using Scion Image Software, Sara Robinson, Peter Laks, Ethan J. Turnquist
Michigan Tech Publications
Color analysis of spalted wood surfaces requires a non-subjective, repeatable method for determining percent of pigmentation on the wood surface. Previously published methods used human visual perception with a square grid overlay to determine the percent of surface pigmentation. Our new method uses Scion Image©, a graphical software program used for grayscale and color analysis, to separate fungal pigments from the wood background. These human interface processes render the wood block into HSV (hue, saturation, value, within the RGB color space), allowing subtle and drastic color changes to be visualized, selected and analyzed by the software. Analysis with Scion Image© …