Hartwig Hochmair | University of Florida (original) (raw)
Papers by Hartwig Hochmair
Lecture Notes in Geoinformation and Cartography, 2000
ABSTRACT
Proceedings of the 15th annual ACM international symposium on Advances in geographic information systems - GIS '07, 2007
ABSTRACT
Http Dx Doi Org 10 1603 Ec09428, Aug 1, 2010
Marine vessels have been implicated in the anthropogenic dispersal of invasive termites for the p... more Marine vessels have been implicated in the anthropogenic dispersal of invasive termites for the past 500 yr. It has long been suspected that two invasive termites, the Formosan subterranean termite, Coptotermes formosanus Shiraki, and Coptotermes gestroi (Wasmann) (Isoptera: Rhinotermitidae), were introduced to and dispersed throughout South Florida by sailboats and yachts. We compared the distances between 190 terrestrial point records for Formosan subterranean termite, 177 records for C. gestroi, and random locations with the nearest marine dockage by using spatial analysis. Results show that the median distance to nearest docks associated with C. gestroi is significantly smaller than for the random points. Results also reveal that the median distance to nearest docks associated with Formosan subterranean termite is significantly smaller than for the random points. These results support the hypothesis that C. gestroi and Formosan subterranean termite are significantly closer to potential infested boat locations, i.e., marine docks, than random points in these urban areas. The results of our study suggest yet another source of aggregation in the context of exotic species, namely, hubs for pleasure boating.
Transportation Research Record: Journal of the Transportation Research Board, 2015
ABSTRACT Finding a scenic route between two locations is a common trip planning task, in particul... more ABSTRACT Finding a scenic route between two locations is a common trip planning task, in particular for tourists and recreational travelers. For the automated computation of a scenic route in a trip planning system it is necessary to understand which attributes of a route and its surroundings are associated with attractive scenery. One way to answer this question is to use a route choice model framework which requires a choice set of realistic paths for traveling a scenic route. This study proposes a constrained enumeration type algorithm for computing scenic alternatives using a branch-and-bound approach and a labeling algorithm in combination with link elimination to generate a scenic route choice set. These algorithms use Volunteered Geographic Information (VGI), more specifically shared geotagged photos from Panoramio, to generate path alternatives. The results show that the proposed branch-and-bound algorithm replicates observed travel behavior better than the traditional deterministic minimum-cost based algorithms in terms of overlap and consistency. The proposed branch-and-bound method results also in routes along which the average number of scenic clusters is almost identical to that found along observed scenic routes, which outperforms all other evaluated algorithms in this aspect as well.
Transportation Research Record Journal of the Transportation Research Board, Feb 3, 2015
ABSTRACT
Transportation Research Record: Journal of the Transportation Research Board, 2014
ABSTRACT
The Professional Geographer, Feb 10, 2011
The least-angle strategy is a common wayfinding method that can be applied in unknown environment... more The least-angle strategy is a common wayfinding method that can be applied in unknown environments if the target direction is known. The strategy is based on the navigator's heuristic to select the street segment at an intersection which is most in line with the target direction. To use this strategy, the navigator needs to know the angles between the target direction and the street segments leading out from the intersection. If the direct view to the target is blocked and the target vector cannot be perceived, the target direction that is needed for the decision process is based on the agent's believed position and orientation (estimated through path integration). The agent's believed position and target direction are distorted by human errors in estimation of distances and directions, mainly affecting the path integration process. In this paper we examine how human estimation errors of distance and rotation influence the decision behavior in the wayfinding process in an unknown street environment. To demonstrate the geometrical consequences for a specific test case, we use a simulated software agent which navigates in a simulated street environment.
Lecture Notes in Geoinformation and Cartography, 2000
Although most of today’s navigation systems are used for guidance of cars, recent progress in mob... more Although most of today’s navigation systems are used for guidance of cars, recent progress in mobile computing made it possible for research and industry to develop various prototypes of indoor-navigation systems in combination with PDAs. Independent of the presentation mode of route instructions, it is desirable that such real-time route guidance system automatically delivers the correct piece of information to the user at the right time. This requires that the PDA knows the user’s position and orientation, which is not always available due to technical limitations of indoor sensing and positioning techniques, and potential signal dropouts. Using a desktop usability study, this chapter extends previous work on route instructions with mobile devices. The study explores the preferred modes of interaction between user and PDA in case of diluted position and orientation accuracies.
Florida Entomologist, Jan 7, 2014
The ability to manage geospatial data has made Geographic Information Systems (GIS) an important ... more The ability to manage geospatial data has made Geographic Information Systems (GIS) an important tool for a wide range of applications over the past decades, including management of natural resources, analysis of wildlife movement, ecological niche modeling, or land records management. This paper illustrates, using invasive termite species as examples, how GIS can assist in identifying their potential sources of infestations and model their spread in urban South Florida. The first case study shows that the Formosan subterranean termite, Coptotermes formosanus Shiraki, and the Asian subterranean termite, Coptotermes gestroi (Wasmann) (Isoptera: Rhinotermitidae), were introduced into and dispersed across South Florida by sailboats and yachts. The second case study shows an agent-based model to simulate the natural spread of Nasutitermes corniger (Motschulsky) (Isoptera: Termitidae) in Dania Beach, Florida. This paper provides an overview of basic functionalities in GIS and demonstrates how they can be customized for advanced modeling and simulation.
Over the last years, electronic route planners have become a common decision support tool especia... more Over the last years, electronic route planners have become a common decision support tool especially for car drivers. Through the ongoing development of Location Based Service (LBS), electronic route planners are expected to be more frequently used by cyclists and pedestrians in the near future, too. For a user friendly design of route planners, the number of route selection criteria among which the user can choose is one of the key aspects. This paper describes and analyses observed route choice behavior of cyclists in urban environments and assesses the number of criteria the navigator considers for selecting the best route. In a desktop experiment, the testing subjects stated their preferred route among four given route suggestions on a paper map. The stated preferences were compared to the ranking found by self explicated preference analysis. The results show that the decision behavior of most users can be explained through a compensatory decision rule. We conclude that the user interface of a route planning support tool should provide the functionality to allow a navigator for stating his preferences for several route selection criteria, and not only for one single criterion.
ABSTRACT The purpose of electronic route planners is to provide the optimal route to the user. Th... more ABSTRACT The purpose of electronic route planners is to provide the optimal route to the user. The optimal route is defined over a set of evaluation criteria considered by the user. Requesting user input on all possible route selection criteria within the route finding process would overcrowd ,the user interface of the route planner, especially when several transportation modes are
Due to numerous benefits of bicycling as a means of transportation, planning and policy efforts a... more Due to numerous benefits of bicycling as a means of transportation, planning and policy efforts at all levels of governments aim to increase levels of bicycling. In order to decide where to best invest tax payer's money in bicycle facilities, many cities and regional planning agencies base their decisions on bike counts at the present. However, in areas of poor bicycle infrastructure, this tends to lead to negative feedback loops in policy making and planning, as fewer bicycle counts also means less investment. This paper presents a new GIS- and network-based method that identifies on which network portions an improvement of bicycle facilities can create most additional bicycle demand. These network portions may also be segments of currently low bicycle use.
There are many strategies for wayfinding strategies in the physical world and the World Wide Web ... more There are many strategies for wayfinding strategies in the physical world and the World Wide Web (WWW). The decision processes of these strategies use various cues from the environment, such as topologic relations, information from other navigators, images of places, semantics of objects, and metric information. This paper discusses how the representation of the goal and the environment in the agent's cognitive map influence the decision criteria applied during the wayfinding process. We give a classification of decision situations that use one or several attributes as input, and look at the role of the user's preferences for decisionmaking. Two wayfinding simulations demonstrate the combination of goaldependent criteria and preferences both for the physical world and the WWW.
Lecture Notes in Computer Science, 2005
ABSTRACT
Journal of economic entomology, 2015
The Formosan subterranean termite, Coptotermes formosanus Shiraki, is a pest of major economic co... more The Formosan subterranean termite, Coptotermes formosanus Shiraki, is a pest of major economic concern. This termite is particularly known for its tendency to establish populations in nonendemic areas via maritime vessels as well as human-aided transport of infested materials. The natural spread of this species after new introductions occurs in part by dispersal flights originating from mature colonies. Dispersal flight activity is also the primary variable for the evaluation of area-wide management programs. Few studies exist describing the dynamics and distribution of a typical dispersal flight for this species. The present study used data collected by mark-recapture of C. formosanus alates over 12 individual evenings of dispersal flights in the New Orleans French Quarter. In this study, we found that for one selected flight dispersal location, which was not affected by a high density of trap locations nearby, alates flew on average 621 m from their parent colony. A new record of ...
Lecture Notes in Geoinformation and Cartography, 2000
ABSTRACT
Proceedings of the 15th annual ACM international symposium on Advances in geographic information systems - GIS '07, 2007
ABSTRACT
Http Dx Doi Org 10 1603 Ec09428, Aug 1, 2010
Marine vessels have been implicated in the anthropogenic dispersal of invasive termites for the p... more Marine vessels have been implicated in the anthropogenic dispersal of invasive termites for the past 500 yr. It has long been suspected that two invasive termites, the Formosan subterranean termite, Coptotermes formosanus Shiraki, and Coptotermes gestroi (Wasmann) (Isoptera: Rhinotermitidae), were introduced to and dispersed throughout South Florida by sailboats and yachts. We compared the distances between 190 terrestrial point records for Formosan subterranean termite, 177 records for C. gestroi, and random locations with the nearest marine dockage by using spatial analysis. Results show that the median distance to nearest docks associated with C. gestroi is significantly smaller than for the random points. Results also reveal that the median distance to nearest docks associated with Formosan subterranean termite is significantly smaller than for the random points. These results support the hypothesis that C. gestroi and Formosan subterranean termite are significantly closer to potential infested boat locations, i.e., marine docks, than random points in these urban areas. The results of our study suggest yet another source of aggregation in the context of exotic species, namely, hubs for pleasure boating.
Transportation Research Record: Journal of the Transportation Research Board, 2015
ABSTRACT Finding a scenic route between two locations is a common trip planning task, in particul... more ABSTRACT Finding a scenic route between two locations is a common trip planning task, in particular for tourists and recreational travelers. For the automated computation of a scenic route in a trip planning system it is necessary to understand which attributes of a route and its surroundings are associated with attractive scenery. One way to answer this question is to use a route choice model framework which requires a choice set of realistic paths for traveling a scenic route. This study proposes a constrained enumeration type algorithm for computing scenic alternatives using a branch-and-bound approach and a labeling algorithm in combination with link elimination to generate a scenic route choice set. These algorithms use Volunteered Geographic Information (VGI), more specifically shared geotagged photos from Panoramio, to generate path alternatives. The results show that the proposed branch-and-bound algorithm replicates observed travel behavior better than the traditional deterministic minimum-cost based algorithms in terms of overlap and consistency. The proposed branch-and-bound method results also in routes along which the average number of scenic clusters is almost identical to that found along observed scenic routes, which outperforms all other evaluated algorithms in this aspect as well.
Transportation Research Record Journal of the Transportation Research Board, Feb 3, 2015
ABSTRACT
Transportation Research Record: Journal of the Transportation Research Board, 2014
ABSTRACT
The Professional Geographer, Feb 10, 2011
The least-angle strategy is a common wayfinding method that can be applied in unknown environment... more The least-angle strategy is a common wayfinding method that can be applied in unknown environments if the target direction is known. The strategy is based on the navigator's heuristic to select the street segment at an intersection which is most in line with the target direction. To use this strategy, the navigator needs to know the angles between the target direction and the street segments leading out from the intersection. If the direct view to the target is blocked and the target vector cannot be perceived, the target direction that is needed for the decision process is based on the agent's believed position and orientation (estimated through path integration). The agent's believed position and target direction are distorted by human errors in estimation of distances and directions, mainly affecting the path integration process. In this paper we examine how human estimation errors of distance and rotation influence the decision behavior in the wayfinding process in an unknown street environment. To demonstrate the geometrical consequences for a specific test case, we use a simulated software agent which navigates in a simulated street environment.
Lecture Notes in Geoinformation and Cartography, 2000
Although most of today’s navigation systems are used for guidance of cars, recent progress in mob... more Although most of today’s navigation systems are used for guidance of cars, recent progress in mobile computing made it possible for research and industry to develop various prototypes of indoor-navigation systems in combination with PDAs. Independent of the presentation mode of route instructions, it is desirable that such real-time route guidance system automatically delivers the correct piece of information to the user at the right time. This requires that the PDA knows the user’s position and orientation, which is not always available due to technical limitations of indoor sensing and positioning techniques, and potential signal dropouts. Using a desktop usability study, this chapter extends previous work on route instructions with mobile devices. The study explores the preferred modes of interaction between user and PDA in case of diluted position and orientation accuracies.
Florida Entomologist, Jan 7, 2014
The ability to manage geospatial data has made Geographic Information Systems (GIS) an important ... more The ability to manage geospatial data has made Geographic Information Systems (GIS) an important tool for a wide range of applications over the past decades, including management of natural resources, analysis of wildlife movement, ecological niche modeling, or land records management. This paper illustrates, using invasive termite species as examples, how GIS can assist in identifying their potential sources of infestations and model their spread in urban South Florida. The first case study shows that the Formosan subterranean termite, Coptotermes formosanus Shiraki, and the Asian subterranean termite, Coptotermes gestroi (Wasmann) (Isoptera: Rhinotermitidae), were introduced into and dispersed across South Florida by sailboats and yachts. The second case study shows an agent-based model to simulate the natural spread of Nasutitermes corniger (Motschulsky) (Isoptera: Termitidae) in Dania Beach, Florida. This paper provides an overview of basic functionalities in GIS and demonstrates how they can be customized for advanced modeling and simulation.
Over the last years, electronic route planners have become a common decision support tool especia... more Over the last years, electronic route planners have become a common decision support tool especially for car drivers. Through the ongoing development of Location Based Service (LBS), electronic route planners are expected to be more frequently used by cyclists and pedestrians in the near future, too. For a user friendly design of route planners, the number of route selection criteria among which the user can choose is one of the key aspects. This paper describes and analyses observed route choice behavior of cyclists in urban environments and assesses the number of criteria the navigator considers for selecting the best route. In a desktop experiment, the testing subjects stated their preferred route among four given route suggestions on a paper map. The stated preferences were compared to the ranking found by self explicated preference analysis. The results show that the decision behavior of most users can be explained through a compensatory decision rule. We conclude that the user interface of a route planning support tool should provide the functionality to allow a navigator for stating his preferences for several route selection criteria, and not only for one single criterion.
ABSTRACT The purpose of electronic route planners is to provide the optimal route to the user. Th... more ABSTRACT The purpose of electronic route planners is to provide the optimal route to the user. The optimal route is defined over a set of evaluation criteria considered by the user. Requesting user input on all possible route selection criteria within the route finding process would overcrowd ,the user interface of the route planner, especially when several transportation modes are
Due to numerous benefits of bicycling as a means of transportation, planning and policy efforts a... more Due to numerous benefits of bicycling as a means of transportation, planning and policy efforts at all levels of governments aim to increase levels of bicycling. In order to decide where to best invest tax payer's money in bicycle facilities, many cities and regional planning agencies base their decisions on bike counts at the present. However, in areas of poor bicycle infrastructure, this tends to lead to negative feedback loops in policy making and planning, as fewer bicycle counts also means less investment. This paper presents a new GIS- and network-based method that identifies on which network portions an improvement of bicycle facilities can create most additional bicycle demand. These network portions may also be segments of currently low bicycle use.
There are many strategies for wayfinding strategies in the physical world and the World Wide Web ... more There are many strategies for wayfinding strategies in the physical world and the World Wide Web (WWW). The decision processes of these strategies use various cues from the environment, such as topologic relations, information from other navigators, images of places, semantics of objects, and metric information. This paper discusses how the representation of the goal and the environment in the agent's cognitive map influence the decision criteria applied during the wayfinding process. We give a classification of decision situations that use one or several attributes as input, and look at the role of the user's preferences for decisionmaking. Two wayfinding simulations demonstrate the combination of goaldependent criteria and preferences both for the physical world and the WWW.
Lecture Notes in Computer Science, 2005
ABSTRACT
Journal of economic entomology, 2015
The Formosan subterranean termite, Coptotermes formosanus Shiraki, is a pest of major economic co... more The Formosan subterranean termite, Coptotermes formosanus Shiraki, is a pest of major economic concern. This termite is particularly known for its tendency to establish populations in nonendemic areas via maritime vessels as well as human-aided transport of infested materials. The natural spread of this species after new introductions occurs in part by dispersal flights originating from mature colonies. Dispersal flight activity is also the primary variable for the evaluation of area-wide management programs. Few studies exist describing the dynamics and distribution of a typical dispersal flight for this species. The present study used data collected by mark-recapture of C. formosanus alates over 12 individual evenings of dispersal flights in the New Orleans French Quarter. In this study, we found that for one selected flight dispersal location, which was not affected by a high density of trap locations nearby, alates flew on average 621 m from their parent colony. A new record of ...