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Waas, Glonass, And Gps Accuracy, Yanli Zhang, Daniel Unger, I-Kuai Hung, David Kulhavy
Waas, Glonass, And Gps Accuracy, Yanli Zhang, Daniel Unger, I-Kuai Hung, David Kulhavy
Faculty Publications
No abstract provided.
Evaluating Gps Effectiveness For Natural Resource Professionals: Integrating Undergraduate Students In The Decision-Making Process, Daniel Unger, I-Kuai Hung, Yanli Zhang, David Kulhavy
Evaluating Gps Effectiveness For Natural Resource Professionals: Integrating Undergraduate Students In The Decision-Making Process, Daniel Unger, I-Kuai Hung, Yanli Zhang, David Kulhavy
Faculty Publications
Undergraduate students pursuing a Bachelor of Science in Forestry (BSF) degree at Stephen F. Austin State University (SFA) attend an intensive 6-week residential hands-on instruction in applied field methods. For students pursuing the BSF degree knowing the exact location of a forestland is crucial to the understanding and proper management of any related natural resource. The intensive 6-week instruction includes teaching how to use the Global Positioning System (GPS) to accurately record the spatial location of an earth’s surface feature. After receiving hands-on instructions during the summer of 2014, students were taken to the field to collect real-world locations. Students …
A Test Of The Mean Distance Method For Forest Regeneration Assessment, Daniel Unger, Jeremy P. Stovall, Brian P. Oswald, David Kulhavy, I-Kuai Hung
A Test Of The Mean Distance Method For Forest Regeneration Assessment, Daniel Unger, Jeremy P. Stovall, Brian P. Oswald, David Kulhavy, I-Kuai Hung
Faculty Publications
A new distance-based estimator for forest regeneration assessment, the mean distance method, was developed by combining ideas and techniques from the wandering quarter method, T-square sampling and the random pairs method. The performance of the mean distance method was compared to conventional 4.05 square meter plot sampling through simulation analysis on 405 square meter blocks of a field surveyed clumped distribution and a computer generated random distribution at different levels of density of 100, 50 and 25%. The mean distance method accurately estimated density on the random populations but the mean distance method estimates were more variable than those of …
Quantifying Natural Resources Using Field-Based Instruction And Hands-On Applications, Daniel Unger, David Kulhavy, I-Kuai Hung, Yanli Zhang
Quantifying Natural Resources Using Field-Based Instruction And Hands-On Applications, Daniel Unger, David Kulhavy, I-Kuai Hung, Yanli Zhang
Faculty Publications
Undergraduate students pursuing a Bachelor of Science in Forestry (BSF) degree at Stephen F. Austin State University (SFA) attend an intensive 6-week residential hands-on instruction in applied field methods. For students pursuing the BSF degree knowing the exact location, length, or area of a forestland is crucial to the understanding and proper management of any related natural resource. The intensive 6-week instruction includes teaching how to use the Global Positioning System (GPS) to accurately record the true spatial location of an earth’s surface feature. After receiving hands-on instructions during the summer of 2013, students were taken to the field to …
Using Google Earth For Forest Management, Yanli Zhang, Jeremy P. Stovall
Using Google Earth For Forest Management, Yanli Zhang, Jeremy P. Stovall
Faculty Publications
No abstract provided.
Measuring Tree Height Using Pictometry Hyperspatial Imagery, Daniel Unger, David Kulhavy, Matthew A. Wade, I-Kuai Hung
Measuring Tree Height Using Pictometry Hyperspatial Imagery, Daniel Unger, David Kulhavy, Matthew A. Wade, I-Kuai Hung
Faculty Publications
Trees within Nacogdoches, Texas were measured for height using Pictometry hyperspatial imagery at 4 inch spatial resolution. Trees measured included baldcypress located on LaNana Creek as part of a hybrid analysis study. Baldcypress, Taxodiumdistichum, was planted along La Nana Creek, Nacogdoches, Texas, for erosion control and as a test bank for growth of the species genotypes. Each tree was located with GPS and entered into the GIS data base in the Arthur Temple College of Forestry and Agriculture, Stephen F. Austin State University. Actual tree height, measured using a height pole in 0.1 inch increments, was compared to …
Instream Woody Debris And Riparian Forest Characteristics In The Sabine River, Texas, Matthew W. Mcbroom, Michael Ringer, Yanli Zhang
Instream Woody Debris And Riparian Forest Characteristics In The Sabine River, Texas, Matthew W. Mcbroom, Michael Ringer, Yanli Zhang
Faculty Publications
We examined instream large woody debris (LWD) dynamics on the Sabine River, TX. All wood >10 cm in diameter and >2 m long was measured on four river meanders (meander wavelengths) below the dam on Toledo Bend Reservoir. We determined LWD species, degree of decay, bank orientation, jam association, and stage contact. We also measured riparian vegetation characteristics on each meander. LWD volumes were significantly greater at the site immediately below Toledo Bend Dam, due to the relatively steeper channel gradient and higher rates of channel erosion. Based on mass balance estimates, between 11 and 21% of total annual recruitment …