Shih P.T.-Y.,National Chiao Tung University |
Arumugam D.,Woolpert Inc. |
Shyue S.-W.,National Sun Yat - sen University
Sea Technology | Year: 2011
The article outlines the data acquisition, processing and validation of the Taiwan's Ministry of the Interior-supported project. The project utilized an airborne bathymetric lidar to map the Dongsha Atoll and a portion of the Penghu Islands off the western coast of Taiwan in the Taiwan Strait. The HawkEye II system arrived in Taiwan in August 2010. The team conducted a calibration flight at beginning and the end of the survey. The test flights and calibration verification were all carried out at Penghu. The first part of data calibration is the internal calibration of the HawkEye II, which is carried out in the manufacturer's laboratory. Penghu has four GPS base stations: CIME, WIAN, HUSI and JIBE. They are all enhanced GPS tracking stations owned by National Land Surveying and Mapping Center, Ministry of Interior, Taiwan.
Fox G.A.,Oklahoma State University |
Matlock E.M.,Oklahoma State University |
Guzman J.A.,Oklahoma State University |
Sahoo D.,Woolpert Inc. |
Stunkel K.B.,Oklahoma State University
Journal of Environmental Quality | Year: 2011
Vegetative filter strips (VFS) are commonly used best management practices for removing contaminants from runoff. Additional research is warranted to determine their efficiency and the most appropriate metrics for predicting fecal bacteria reductions. The objective of this research was to determine VFS effectiveness in removing Escherichia coli from runoffrelative to inflow rate, infiltration capacity, and flow concentration. This research also investigated the presence of E. coli in runofffrom clean water runon after diluted manure runon events. A laboratory-scale VFS soil box (200 cm long, 100 cm wide, 7.5% slope) was packed with a sandy loam soil. Ten constant-flow VFS experiments were conducted with and without vegetation (8-10 cm ryegrass [Lolium perenne L.]) at low (20-40 cm 3 s -1), medium (40-60 cm 3 s -1), and high (85-120 cm 3s -1) flow rates and for a full (100 cm) or concentrated (40 cm) VFS flow width to simulate a channelizing flow condition. Two runon events were investigated for each experimental condition: (i) diluted liquid swine manure runon and (ii) clean water runon 48 h afterward. Escherichia coli was used as an indicator of fecal contamination and was quantified by the most probable number (MPN) technique. No E. coli concentration reductions were observed based on peak outflow concentrations, and only small concentration reductions were observed based on outflow event mean concentrations. The E. coli mass reductions ranged from 22 to 71% and were strongly correlated to infiltration or runoffreduction (R 2 = 0.88), which was dependent on the degree of flow concentration. Little to no effect of sedimentation on E. coli transport was observed, hypothesized to be due to minimum E. coli attachment to sediment particles because the bacteria originated from manure sources. Th erefore, the design of VFS for bacteria removal should be based on the infiltration capacity in the VFS and should prevent concentrated flow, which limits total infiltration. The E. coli event mean concentrations in clean water runon experiments were between 10 and 100 MPN per 100 mL; therefore, under these conditions, VFS served as a source of residual E. coli from previous runon events. © 2011 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.
Russomanno D.J.,University of Memphis |
Tritenko Y.,Woolpert Incorporated
Sensors | Year: 2010
A prototype Geographic Information System (GIS) framework has been developed to map, manage, and monitor sensors with respect to other geographic features, including land base and in-plant features. The GIS framework supports geographic placement and subsequent discovery, query, and tasking of sensors in a network-centric environment using Web services. The framework couples the GIS feature placement logic of sensors with an extensible ontology which captures the capabilities, properties, protocols, integrity constraints, and other parameters of interest for a large variety of sensor types. The approach is significant in that custom, GIS-based interfaces can be rapidly developed via the integration of sensors and sensor networks into applications without having detailed knowledge of the sensors' underlying device drivers by leveraging service-oriented computing infrastructure within the GIS framework. © 2010 by the authors; licensee MDPI, Basel, Switzerland.
Medeiros S.C.,University of Central Florida |
Ali T.,American University of Sharjah |
Ali T.,University of Central Florida |
Hagen S.C.,University of Central Florida |
Raiford J.P.,Woolpert Inc
Photogrammetric Engineering and Remote Sensing | Year: 2011
This applications paper presents the methods used to create a seamless topobathy digital terrain model (DTM) at 50-foot resolution intended to support hurricane storm surge modeling in Tampa Bay, Florida. Lidar, bathymetry, and various breakline data were integrated using the Terrain Data Set structure in ArcGIS®. The use of the Terrain Data Set structure allowed for embedding large data sets (such as lidar points) and archiving them after DTM creation while maintaining topographic analysis capabilities. The bathymetric data, natively referenced to Mean Sea Level (MSL), were converted to North American Vertical Datum of 1988 (NAVD88) using an inverse distance weighted average offset from the three nearest NOAA tidal benchmark stations; results of this conversion were within 6.1 centimeters of those produced by NOAA VDatum software in a quality control test area. This methodology can therefore be used in coastal regions of other countries. © 2011 American Society for Photogrammetry and Remote Sensing.
Gluckman J.,Woolpert Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016
Processing data from high-altitude, airborne lidar instruments that employ single-photon sensitive, arrayed detectors poses several challenges. Arrayed detectors produce large volumes of data; single-photon sensitive detectors produce high levels of noise; and high-altitude operation makes accurate geolocation difficult to achieve. To address these challenges, a unique and highly automated processing chain for high-altitude, single-photon, airborne lidar mapping instruments has been developed. The processing chain includes algorithms for coincidence processing, noise reduction, self-calibration, data registration, and geolocation accuracy enhancement. Common to all single-photon sensitive systems is a high level of background photon noise. A key step in the processing chain is a fast and accurate algorithm for density estimation, which is used to separate the lidar signal from the background photon noise, permitting the use of a wide-range gate and daytime operation. Additional filtering algorithms are used to remove or reduce other sources of system and detector noise. An optimization algorithm that leverages the conical scan pattern of the instrument is used to improve geolocation and to self-calibrate the system. © 2016 SPIE.
Borah D.K.,Woolpert Inc.
Hydrological Processes | Year: 2011
Currently, many watershed models are available that have various complexities, strengths, and weaknesses. The basic mathematical foundations of these mathematical models are often overlooked due to high demands on convenient applications with graphical user interfaces. Although this and other factors are important while selecting a model, the mathematical foundation should also be taken into account, as performance or efficiency and accuracy of a model depend on its simplicity or complexity. A comprehensive review of 14 storm event watershed models was conducted. Hydrologic procedures (rainfall excess, flow routing, and subsurface flow) of the models are presented and compiled. Among the procedures, flow routing has the most influence on model performances (speed and accuracy). Overland and channel flow routing procedures using different flow-governing equations, having various approximations and solved by different methods, are compared based on their relative levels of physical bases, complexities, and expected accuracies in simulating the dynamics of water flow. Models using more mathematical terms in the flow-governing equations are more physically based and expected to be more accurate than models using approximations, however, are more complex due to more intensive but approximate numerical schemes (inefficient). Models using approximate equations with analytical solutions may provide a balance between complexity and accuracy. The review and comparisons are useful to modellers, water resources managers, and researchers in understanding the basic foundations of the models and making informed selections for practical applications or further developments. Other factors such as data intensiveness, user friendliness, and resource requirements are also important considerations. © 2011 John Wiley & Sons, Ltd.
Woolpert Inc. | Date: 2011-04-05
Computer software program for modeling the hydrology and erosivity of a land development site and the sediment transfer and trapping efficiency of specific management practices.
Woolpert Inc. | Date: 2011-02-22
computer software program for modeling the hydrology and water quality associated with developed land sites and the pollutant transfer and trapping efficiency of specific management practices, excluding goods and services related to sampling atmospheric air in order to detect contamination.
Woolpert Inc. | Date: 2011-01-11
computer software program for modeling the hydrology and water quality associated with developed and undeveloped land sites and the pollutant transfer and trapping efficiency of specific management practices.
Woolpert Inc. | Date: 2014-08-25
airborne imaging system and software to produce orthomosaics. aerial photography services, aerial imagery collection services, aerial orthophotography services.