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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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    <item>
      <title>Complete Coverage Route Planning for Pesticide-Spraying UAV Considering Varying Wind</title>
      <link>https://trid.trb.org/View/2685951</link>
      <description><![CDATA[This paper considers deploying a multi-rotor Unmanned Aerial Vehicle (UAV) for spraying pesticides precisely and evenly, for completely covering a bounded crop field. Due to varying wind, the multi-rotor UAV can spray inaccurate amount of pesticides on wrong areas, which leads to unwanted pollution of nature. To resolve this problem, this paper addresses a Complete Coverage Route (CCR) planning approach to spray pesticides precisely and evenly on a bounded crop field, considering the effect of wind explicitly. Considering the wind effect, we plan the multi-rotor UAV’s CCR so that there exists no holes in pesticide coverage of a cluttered bounded crop field which may contain conservative area (ex: non-target vegetation or clean pond). The multi-rotor UAV can fly above conservative areas, but we need to avoid spraying pesticide over conservative areas. To the best of our knowledge, our research is novel in proposing how to plan the multi-rotor UAV’s CCR under varying wind, so that the UAV can spray pesticides inside the cluttered bounded crop field precisely and evenly.]]></description>
      <pubDate>Thu, 20 Aug 2026 09:55:20 GMT</pubDate>
      <guid>https://trid.trb.org/View/2685951</guid>
    </item>
    <item>
      <title>IoT-Based Unmanned Aerial Vehicle (UAV) for Smart Farming</title>
      <link>https://trid.trb.org/View/2581842</link>
      <description><![CDATA[Smart farming is utilizing the unmanned aerial vehicles (UAVs) and Internet of Things (IoT) paradigm to achieve the goal of sustainable agriculture. These “smart farms” are made to be maintained by vehicles and connected devices. The combination of several IoT technologies offers huge possibilities for automated processes that require minimal supervision. The suggested method is more reliable and accurate than current systems in tracking the soil’s contents and the safety of the crops because it employs a variety of sensors, including PIR, pH, and capacitance dielectric soil moisture sensors. It also discusses the use of UAV technology in smart agriculture by looking at how UAVs are used in a variety of conditions, such as irrigation, fertilization, weed control, crop monitoring, and field-level phenotyping.]]></description>
      <pubDate>Mon, 27 Apr 2026 15:01:26 GMT</pubDate>
      <guid>https://trid.trb.org/View/2581842</guid>
    </item>
    <item>
      <title>Enhancing Ant Colony Optimization with Genetic Algorithm and 3-Opt for Multiple Drone Spraying Path Planning in Precision Agriculture</title>
      <link>https://trid.trb.org/View/2686143</link>
      <description><![CDATA[Efficient and environmentally responsible pesticide application is a major challenge in precision agriculture. Excessive pesticide use in conventional farming increases costs, harms the environment, and poses health risks. Recent advancements in unmanned aerial vehicles (UAVs) or drones have enabled targeted spraying, yet optimizing multiple-drone route planning and task allocation remains complex due to dynamic field conditions and limited drone capacity. To address this gap, this study proposes a hybrid optimization approach that integrates Ant Colony Optimization (ACO), Genetic Algorithm (GA), and 3Opt to generate efficient flight routes for multiple sprayer drones based on plant health levels. In this framework, ACO assigns drones to target points, GA automatically tunes key ACO parameters, and 3Opt enhances route efficiency through local optimization. Experimental results show that GA effectively automates the tuning of four key ACO parameters and that drone capacity significantly affects route length. The integration of GA, ACO and 3Opt further reduces total route length, achieving up to 13.6% improvement in efficiency compared to traditional ACO. These findings demonstrate the potential of the proposed method to enhance route efficiency, reduce energy consumption, shorter mission completion time and offers a practical solution for improving the performance and sustainability of multiple-drone spraying operations.]]></description>
      <pubDate>Wed, 15 Apr 2026 10:30:18 GMT</pubDate>
      <guid>https://trid.trb.org/View/2686143</guid>
    </item>
    <item>
      <title>Weather Radar Augmented Positioning (WRAP) Technology for Aerial Vehicles</title>
      <link>https://trid.trb.org/View/2675937</link>
      <description><![CDATA[Problem Statement: As the modern transportation
navigation systems increasingly rely on Global Positioning System/Global Navigation Satellite System (GPS/GNSS) signals, the potential transportation safety risks also
increase significantly should there be intruptions in
transmitting or receiving GPS/GNSS signals in the
events such as strong solar wind activities,
unintentional interferences, or intentional jamming.
To mitigate these transportation safety risks, several
alternative positioning technologies are being
actively developed. These technologies include using
ground-base GPS/GNSS pseudolites and using signal
of opportunities (SOP) transmitted from cellular
towers and LEO communication satellites. However,
the deployment of ground-based GPS/GNSS
pseudolites are still very limited and facing several regulation hurdles over potentially causing
interferences and human RF exposure risks. The coverage of cellular signals are still lacking in rural
or remote areas, and not available at higher altitude above the ground level (AGL), and using LEO
satellite signals for navigation are more complex and expensive. This project will explore the
utilization of the radar signals transmitted from the existing NEXRAD WSR-88D Weather Radar
Network for navigating aerial vehicles. These signals are within the designated 2700-3000 MHz
frequency band with 25 MHz bandwidth. The two key advantage of these SOP signals are strong
signal strength and wide coverage of almost entire US.
Objectives: The main research objectives of this project include demonstrating the feasibility of
using the strong ubiquatus weather radar signals for aerial vehicle navigation needs, defining the
key system hardware and software requirements, and identifying performance limitations.
Scope: This 12-month research effort will include (1) characterizing the NEXRAD signal strengths
and waveforms, (2) investigating distributed receiving antenna strategy, (3) developing positioning
algorithms, and (4) analyzing the positions accuracy and limitations.]]></description>
      <pubDate>Mon, 02 Mar 2026 15:37:07 GMT</pubDate>
      <guid>https://trid.trb.org/View/2675937</guid>
    </item>
    <item>
      <title>Synchronized truck and drone routing under disastrous conditions (case study: urban thoroughfares disinfection)</title>
      <link>https://trid.trb.org/View/2193106</link>
      <description><![CDATA[Spraying unmanned aerial vehicles (UAVs) are widely utilized in the agricultural sector for various field operations including irrigation as well as fertilizing and pesticides applications. In this paper, we explore the application of spraying UAVs to neutralize environmental contamination or infections in crises such as outbreak of epidemics. Given the limitations of current UAV technologies and their operational constraints in urban areas, such crisis management operations are carried out in collaboration with ground vehicles. Consequently, a novel mixed-integer linear programming (MILP) model is proposed to facilitate the collaboration of ground vehicles with UAVs. A hybrid heuristic algorithm consisting of simulated annealing and tabu search is also developed to solve the large-size instances efficiently. Finally, the applicability of the model and its solution approach are validated using real-world data.]]></description>
      <pubDate>Thu, 27 Jul 2023 09:28:23 GMT</pubDate>
      <guid>https://trid.trb.org/View/2193106</guid>
    </item>
    <item>
      <title>Comparison of Aerial Application vs. Ground Application</title>
      <link>https://trid.trb.org/View/1695190</link>
      <description><![CDATA[This work is focused on the analysis of efficiency of aerial and ground applications of chemicals for agricultural purposes. The laws of the European Union, as well as people’s awareness, determine the exact opposite of the aerial application. The aerial application is “heading for extinction” because of its inefficiency and inaccuracy. The next thing the authors would like to point out and compare is the application of crop spraying and the applications of solid material. The focus of the work is mainly based on the price calculation resulting from damaging the crops by the wheels and the lower parts of the tractor.]]></description>
      <pubDate>Mon, 27 Apr 2020 14:39:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/1695190</guid>
    </item>
    <item>
      <title>Quantitative Analysis of Low Pressure-Driven Spray Mass Distribution and Liquid Entrainment for SCR Application through a Mechanical Patternator</title>
      <link>https://trid.trb.org/View/1462404</link>
      <description><![CDATA[The application of liquid aqueous Urea Solution (AUS) as reductant in SCR exhaust after-treatment systems is now a commonly accepted industry standard. Unfortunately, less acceptable are the associated difficulties caused by incomplete decomposition of the liquid, resulting in solid deposits which accumulate in the exhaust pipe downstream of the dosing components. The correct prediction of the spray pattern and, therefore, the spray impact on the walls is a key feature for the system optimization. A mechanical patternator, designed on the basis of CFD performance assessment, involving a Lagrangian representation of the dispersed liquid fully coupled with a 3D Eulerian description of the carrier phase, has been built and used to measure the spray mass distribution. The effect of the droplets generated from the interaction among spray, probes and contingent liquid film is taken into account in the geometrical definition of the shape and the position of the patternator, as well as the flow field modification. The whole simulation process is carried out with the open source finite volume platform OpenFOAM®. The investigation of the effect of a wide range of thermal and kinematic cross flow conditions on the behavior of a multi-hole pressure-driven injector for SCR applications has been performed in an engineless test bench at the Empa laboratories. Major focus is put on the evaluation of the complete spray footprint, which is collected with high spatial resolution to generate a reliable map of the conditions, aiming at avoiding the formation of permanent liquid film, which is undeniably the basis of solid deposit formation. A detailed parametric analysis of the liquid entrainment and of the impact location is reported to provide a concise description of the spray behavior.       ]]></description>
      <pubDate>Sat, 09 Jun 2018 11:44:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/1462404</guid>
    </item>
    <item>
      <title>Comparing Different Rejuvenator Addition Locations in Asphalt Plant Based on Mechanical and Chemical Properties of Binder</title>
      <link>https://trid.trb.org/View/1494357</link>
      <description><![CDATA[Rejuvenators have the potential to restore the reclaimed asphalt pavement (RAP) binder for another service period. Due to ever increasing asphalt recycling rates, appropriate use of rejuvenators is becoming more important. Homogeneous distribution of rejuvenator and good diffusion into RAP film are critical. Rejuvenator addition also has to be safe to the employees and environment. Unfortunately these full scale processes are difficult to replicate and thus optimize in the laboratory. This study lists ten potential rejuvenator addition locations. A full scale in–plant experiment was carried out to compare two of the most promising of them: spraying of rejuvenator on cold reclaimed asphalt on the feeding belt before heating versus addition of rejuvenator to hot reclaimed asphalt in mixer. Reclaimed asphalt samples were collected at various places in the production line to evaluate the effect of rejuvenator addition location on softening point, penetration, rheology, and chemical composition of extracted binder. The study revealed that binder mechanical performance and chemical aging are similar regardless of rejuvenator addition location. A potential benefit of early rejuvenator addition is that it provides longer residing time of rejuvenator on the binder and thus potentially may allow higher binder activation and better blending of RAP binder with rejuvenator and virgin binder. This would have to be evaluated through mixture tests and will be carried out as the next stage of the research.]]></description>
      <pubDate>Sun, 21 Jan 2018 17:53:31 GMT</pubDate>
      <guid>https://trid.trb.org/View/1494357</guid>
    </item>
    <item>
      <title>Aerial Application of Herding Agents to Advance In-Situ Burning for Oil Spill Response in the Arctic: a Pilot Study</title>
      <link>https://trid.trb.org/View/1487973</link>
      <description><![CDATA[In-situ burning (ISB) aided by herding agents is a promising tool for oil spill response in Arctic waters. An advantageous aspect of the herder mediated ISB approach is that the application of herders as well as the subsequent ignition of the slick could potentially be carried out from aerial platforms. This could obviate the need for personnel to conduct operations on the surface near the burn, as well as reduce the response time required to mobilize the spill response equipment, especially in difficult Arctic conditions. In the last decade, several laboratory and field-scale tests have been conducted to prove the efficacy of herding agent mediated ISB operations, sometimes achieving burn efficiencies > 90%. However, there have been no reports of aerial herder application followed by ignition. The objectives of this work were to evaluate a proof-of-concept level application of aerial herders and igniters for ISB operations in the Arctic, and to investigate the associated operational and technical challenges. This paper presents results from a series of field experiments performed in a custom-built test basin 50 km northeast of Fairbanks, Alaska, in April 2015. A helicopter was employed to first apply herding agents (Siltech OP-40 or ThickSlick 6535) to Alaska North Slope crude oil slicks in simulated drift ice conditions, and then ignite the herded slicks using a heli-torch. Burn efficiency (BE) for the confined field scale in-situ burn tests ranged from 59% to 94% using the gravimetric approach and 73% to 84% using the conservative aerial imagery approaches to evaluate the herder action. The moderately high BE values observed in the field-scale light ice-cover (~ 10%) conditions, establish the effectiveness and promise of aerial application of herders to assist ISB in the Arctic. This is a first account of successful aerial application of herders for ISB in the Arctic or elsewhere, and furthers the development of better tools for oil spill response in Arctic waters and beyond.]]></description>
      <pubDate>Wed, 27 Dec 2017 10:24:23 GMT</pubDate>
      <guid>https://trid.trb.org/View/1487973</guid>
    </item>
    <item>
      <title>Rapid Orthophoto Development System</title>
      <link>https://trid.trb.org/View/1264716</link>
      <description><![CDATA[The DMC system procured in the project represented state-of-the-art, large-format digital aerial camera systems at the start of project. DMC is based on the frame camera model, and to achieve large ground coverage with high spatial resolution, the output image is formed from four independent images acquired by four cameras. DMC procured for OCMS was carefully tested to assess its performance level. From test flights by ODOT, three different blocks were selected, representing different flying condition and flight geometry. Five methods were used for the performance evaluation, including two methods where self-calibration was also introduced. The analysis of the results confirmed that the DMC meets the manufacturer’s specification. To maintain consistent performance in normal operations, periodical calibration flights and the use of ground controls as check points is highly recommended. In addition to further support QA/QC, the use of automated aerial triangulation is also suggested. The main product of the ODOT Office of Mapping and CADD Services is orthophoto, which is widely used in many applications at ODOT and other State offices. Since ODOT primarily acquires data over the transportation network, the orthophoto production has some specific needs, such as dealing with bridges and occlusions, besides the general tasks of the orthoimage workflow. In this project, an innovative method was developed to support the orthoimage generation at bridges. The concept is built around the development of a precise bridge model, which is formed from the DMC imagery and LiDAR data. In addition, a true orthophoto generation process was implemented. The initial versions of both software tools installed at Office of CADD and Mapping Services for testing provided valuable feedback for algorithmic refinements.]]></description>
      <pubDate>Tue, 15 Oct 2013 09:46:34 GMT</pubDate>
      <guid>https://trid.trb.org/View/1264716</guid>
    </item>
    <item>
      <title>Creation of a Committed Johnsongrass Area and Implementation Study</title>
      <link>https://trid.trb.org/View/1218749</link>
      <description><![CDATA[This project was to develop a committed roadside Johnson grass research area with controlled mowing and date of spraying adjacent to US 63 from I-74 south to JCT US 36 and to continue studies of a cold-adapted Johnson grass ecotype identified in the Northern-most tier counties in Indiana (IN) in an area adjacent to IN 23 between South Bend and New Liberty, IN. The cold-adapted Johnson grass provides a further threat of encroachment of roadside-established Johnson grass onto adjacent cropland of considerable potential economic consequence. Completed was a 3-year study with Roundup alone and in combination with Outrider either as a tank mix or sequentially with Roundup followed after several weeks by Outrider or Outrider followed after several weeks by Roundup comparing different rates, dates of application and stages of development. Roundup alone or in sequence several weeks following Outrider was without effect on Johnson grass regrowth. A small benefit from 0.4 lb/A Roundup 3 to 6 weeks post Outrider was insufficient to justify the additional cost and offered no benefit over post Outrider mowing at the same stage. Correlations were with stage of growth with Johnson grass 24 to 30 in. tall, 33-36 in. tall and 40-42 in. tall without seed heads, seed heads forming in the boot, early anthesis (flowering), late flowering or with seed heads formed and 50-60 in. tall and spray date. Fall 2006 marked initiation of the final implementation of the project. Outrider alone at a rate of 0.5 oz/100 gal plus a detergent at 0.12% of the total spray mixture spot sprayed to the point of runoff is to be recommended. Best results are expected with regrowth following mowing although about >90% control can be expected from midseason to late spraying of mature Johnson grass. Evaluated in 2007 and 2008 was the optimum regrowth stage to treat and the response to mowing following spraying. Johnson grass can be mowed very soon after spraying (next day or late same day) without loss of treatment effectiveness. In laboratory studies, a candidate Outrider binding protein was identified and cloned.]]></description>
      <pubDate>Thu, 15 Nov 2012 14:01:45 GMT</pubDate>
      <guid>https://trid.trb.org/View/1218749</guid>
    </item>
    <item>
      <title>Roots : from crop duster to airline, the origins of Delta Air Lines to World War II</title>
      <link>https://trid.trb.org/View/1222268</link>
      <description><![CDATA[]]></description>
      <pubDate>Wed, 07 Nov 2012 14:43:57 GMT</pubDate>
      <guid>https://trid.trb.org/View/1222268</guid>
    </item>
    <item>
      <title>Creating stable and healthy roadsides</title>
      <link>https://trid.trb.org/View/1141790</link>
      <description><![CDATA[Right-of-way grasses can be kept weed-free and beautiful by appropriately selecting herbicides and knowing how to use them, as this article details. The effects of herbicides are explained, foliar spraying tips are included, and application rates and calibration are discussed.]]></description>
      <pubDate>Wed, 27 Jun 2012 16:34:21 GMT</pubDate>
      <guid>https://trid.trb.org/View/1141790</guid>
    </item>
    <item>
      <title>Agricultural Aircraft Operations on Municipal Airports: A Guidebook for Municipal Airport Managers</title>
      <link>https://trid.trb.org/View/1125521</link>
      <description><![CDATA[The guidelines contained in this guidebook were originally put together by the Minnesota Agricultural Aircraft Association (MAAA) and the Minnesota Council of Airports (MCOA) in 1995, with input from the Minnesota Department of Transportation (Mn/DOT)–Office of Aeronautics and the Minnesota Department of Agriculture (MDA). Issues surrounding the introduction of the storm water permit program, transient operations, and other regulations forced many airport managers to take a closer look at agricultural aircraft operations and evaluate their benefits and liabilities. This guidebook was developed to address their questions and concerns. Today, agricultural aircraft operations remain a viable and important activity routinely conducted at Minnesota’s airports. The issues previously raised are still relevant, and airport owners and operators are seeking to develop sustainable practices that ensure safe and environmentally responsible operations. In addition, many new resources are available from a variety of public agencies. The Airport Technical Assistance Program (AirTAP) was asked to review the existing document and revise and update information as needed. Input was again solicited from the MAAA, MDA, MCOA, and Mn/DOT as well as the Minnesota Pollution Control Agency (MPCA) and the Federal Aviation Administration (FAA)–Minneapolis Airports District Office. The intent of the publication is to provide airport managers with a better understanding of agricultural aircraft operations and recommended practices for dealing with agricultural spraying operations.]]></description>
      <pubDate>Wed, 28 Dec 2011 08:00:17 GMT</pubDate>
      <guid>https://trid.trb.org/View/1125521</guid>
    </item>
    <item>
      <title>Chasing Ehren</title>
      <link>https://trid.trb.org/View/918283</link>
      <description><![CDATA[Subtitle: Now you see him, now you don't.]]></description>
      <pubDate>Wed, 26 May 2010 15:59:39 GMT</pubDate>
      <guid>https://trid.trb.org/View/918283</guid>
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