Hartwig Hochmair

Hartwig Hochmair
University of Florida | UF · Ft. Lauderdale Research & Education Center

PhD

About

85
Publications
15,468
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,607
Citations
Introduction
Skills and Expertise

Publications

Publications (85)
Conference Paper
Full-text available
The COVID-19 pandemic has caused substantial socioeconomic disruptions and affected travel behaviour at various geographic scales. Public parks were some of the few recreational spaces that people could visit while adhering to the COVID-19 mitigation measures such as social distancing, travel restrictions, or curfews. This study draws data from pro...
Article
Full-text available
This study mapped and analyzed urban tree canopy change between 2014 and 2019 within the Urban Development Boundary of Miami-Dade County, Florida. The goal was to identify local areas of tree canopy gain or loss over this 5-year period. The comparison is based on land cover maps delineated from WorldView-2 satellite data applying a random forest cl...
Article
Full-text available
Data from GPS-based fitness tracker apps have become a prominent source for studying cycling behavior. This type of crowd-sourced data provides larger datasets than were previously attainable by travel surveys and cyclist counts, which allows for the comparison of trip characteristics between geographic regions and the study of temporal trends in b...
Article
Full-text available
Urban systems involve a multitude of closely intertwined components, which are more measurable than before due to new sensors, data collection, and spatio-temporal analysis methods. Turning these data into knowledge to facilitate planning efforts in addressing current challengesnof urban complex systems requires advanced interdisciplinary analysis...
Article
Full-text available
Sea Level Rise (SLR) and storm surges are a threat to coastal communities in South Florida. Residents face the increased frequency of tidal flooding and associated economic losses. This paper presents a web-based SLR impact assessment tool that was developed for the City of Coral Gables, Florida. The tool is able to dynamically visualize the inunda...
Article
Full-text available
SafeGraph is a commercial provider of massive Point of Interest (POI) data, including visitation patterns in North America. Although the data source does not share specific travel trajectories, the data available includes daily and monthly POI visitation numbers for over 160 categories, as well as information about where visitors come from and whic...
Article
Full-text available
User-generated map data is increasingly used by the technology industry for background mapping, navigation and beyond. An example is the integration of OpenStreetMap (OSM) data in widely-used smartphone and web applications, such as Pokémon GO (PGO), a popular augmented reality smartphone game. As a result of OSM's increased popularity, the worldwi...
Article
Full-text available
Social media services generate enormous amounts of spatiotemporal data that can be used to characterize and analyze user activities and social behavior. Although crowd-sourced data have the advantage of comprehensive spatial and temporal coverage compared to data collected in more traditional ways, the different social media platforms target differ...
Conference Paper
Full-text available
Numerous online trip planners, such as Google Maps and MapQuest, offer trip recommendations for cycling among other transportation modes. Whereas these platforms are widely used, little is known about the routing criteria embedded into their routing algorithms, and, more specifically, how recommended trips differ from routes travelled by cyclists....
Conference Paper
Full-text available
Spatio-temporal information attached to social media posts allows analysts to study human activity and travel behavior. This study analyzes contribution patterns to the Flickr, Snapchat, and Twitter platforms in over 100 state parks in Central and Northern Florida. The first part of the study correlates monthly visitor count data with the number of...
Chapter
Full-text available
Geo-social media users tend to use different services simultaneously. Whereas significant research attention was put into analyzing contribution patterns to individual social-media platforms, it is less known how the same individual user uses different services. This pilot study analyzes the spatial behavior of users in multiple geo-social media se...
Conference Paper
Full-text available
Snapchat is a widely popular social-media platform among young people. In an update in February 2018, a web-based version of Snap Map was released. Besides using Snapchat for peer-to-peer chatting, users can submit photos and short videos to this feature. Snap Map was found to be useful for the dissemination of breaking news (e.g. protests) and the...
Article
Full-text available
This paper presents the results of a study that explored if and how an OpenStreetMap (OSM) data import task can contribute to OSM community growth. Different outreach techniques were used to introduce a building import task to three targeted OSM user groups. First, existing OSM members were contacted and asked to join the data import project. Secon...
Article
Full-text available
Over the past few years, analysts have begun to materialize the “Citizen as Sensors” principle by analyzing human movements, trends and opinions, as well as the occurrence of events from tweets. This study aims to use geo-tagged tweets to identify and visualize refugee migration patterns from the Middle East and Northern Africa to Europe during the...
Article
Full-text available
In 2016, Niantic Labs released Pokémon Go, an augmented reality smartphone game that attracted millions of users worldwide. This game allows users to " catch " Pokémons through their mobile cameras in different geographic locations that often correspond to prominent places. This paper analyzes the distribution of PokéStops, Pokémon gyms, and spawnp...
Chapter
Full-text available
An increasing number of crowdsourced geo-data repositories and their services allows volunteer mappers to utilize information from various data sources when contributing data to a crowd-sourced mapping platform. This study explores to which extent OpenStreetMap (OSM) contributors use the crowdsourced street level photo service Mapillary to derive m...
Article
Full-text available
Twitter and Instagram are social networking services that allow users to share images. To some extent, both platforms provide means for the user to annotate images with geographic location information. Using a selection of images shared through these two platforms, this study compares the photographer’s position, which is manually estimated from th...
Article
Full-text available
Ad hoc shared ride trip planning (SRTP) utilizes mobile devices, geo-sensors and wireless networks to match on-the-fly individual travel demand with transport supply. It represents one of many alternatives to single occupancy vehicle use. This paper outlines a SRTP approach via a two-phase algorithm based on user preferences in a time-dependent rou...
Chapter
Full-text available
Mapillary, founded in early 2014, is a Web 2.0 application that allows voluntary users to contribute street level photographs from all over the world. This paper analyses the growth in uploaded data and contributor numbers over time, and assesses data completeness by comparing Mapillary with Google Street View and OpenStreetMap data for selected ci...
Article
Full-text available
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 par...
Article
Mobility hubs are major transit access points and an integrated part of multi-modal transportation planning efforts. For the implementation of bicycle infrastructure improvements around mobility hubs a better understanding of bicycle access distances is needed. Using responses from on-board travel surveys in three U.S. metropolitan areas, this stud...
Article
Drones, also known as unmanned aerial vehicles, are nowadays frequently used to supplement traditional airborne data collection methods such as aerial photography and satellite imagery. Dronestagram, launched in July 2013, is one of the first Web 2.0 projects that share georeferenced drone pictures, providing a valuable source of VGI image data. Th...
Conference Paper
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 qu...
Article
Modern technologies in the public transportation sector offer a variety of opportunities to advance solutions for every-day use, such as trip planning. Oftentimes, buses and metro lines do not adhere to their schedules, e.g. due to traffic congestion or overcrowding. In such cases, realtime information on the transit system may be used to find fast...
Article
The needs of people with disabilities are addressed by the United Natioas (UN) Convention on the Rights of Persons with Disabilities, whose intent is that people with disabilities participate equally in societal activities as people without disabilities. The research reported here followed the aim of the UN convention through the development of a g...
Article
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 identify which attributes of a route and its surroundings are associated with attractive scenery. This study uses a route cho...
Article
Full-text available
The type of data an individual contributor adds to OpenStreetMap (OSM) varies by region. The local knowledge of a data contributor allows for the collection and editing of detailed features such as small trails, park benches or fire hydrants, as well as adding attribute information that can only be accessed locally. As opposed to this, satellite im...
Article
Spatially-explicit simulation models can help state and local regulatory agencies to predict both the rate and direction of the spread of an invasive species from a set of surveyed locations. Such models can be used to develop successful early detection, quarantine, or eradication plans based on the predicted areas of infestation. Individual-based...
Article
Full-text available
Predicting the potential habitat of species under both current and future climate change scenarios is crucial for monitoring invasive species and understanding a species' response to different environmental conditions. Frequently, the only data available on a species is the location of its occurrence (presence-only data). Using occurrence records o...
Article
Full-text available
This article assesses the completeness of bicycle trail and on-street lane features in OpenStreetMap (OSM). Comparing OSM cycling features with reference data from local planning agencies for selected US Urbanized Areas shows that OSM bicycle trails tend to be more completely mapped than bicycle lanes. Manual evaluation of mapped cycling features i...
Article
Full-text available
This research analyses the influence of street network structure on household travel patterns, as measured by activity spaces. The analysis uses street network and travel survey data from the Minneapolis - St. Paul (Twin Cities) and Miami - Ft. Lauderdale (South Florida) metropolitan areas. Various measures of street network structure are used to q...
Article
Full-text available
Populations of the arboreal termite, Nasutitermes corniger, discovered in Dania Beach, Florida in 2001 were surveyed and treated for eradication, beginning in 2003. Most N. corniger nest locations were cryptic and some nests contained over 1 million termites. Field efficacy of fipronil (Termidor® SC) and imidacloprid (Premise® 2) were compared in i...
Article
Full-text available
This paper presents a summary of the Action and Interaction in Volunteered Geographic Information international workshop which was held as a one day pre-conference workshop to the 16th Annual Association of Geographic Information Laboratories in Europe conference in Leuven, Belgium in May 2013. This paper summarises the important outcomes of worksh...
Conference Paper
This paper presents a method to extract traversed scenic routes from Volunteered Geographic Information (VGI) data sources. We used the footprints of images posted on Panoramio and Flickr, as well as websites where users uploaded tracks of traversed scenic routes. The state of California has been chosen as the test region. We discuss pros and cons...
Article
Full-text available
The purpose of this research is to test the systematic variation in the perception of travel time among travelers and relate the variation to the underlying street network structure. Travel survey data from the Twin Cities metropolitan area (which includes the cities of Minneapolis and St. Paul) is used for the analysis. Travelers are classified in...
Article
Flickr and Panoramio are fast-growing photo-sharing services that contain millions of geotagged images contributed by Web users from all over the world. This study analyses the positional accuracy of 1433 images for 45 areas in four selected world regions by comparing the geotagged position of photos to the manually corrected camera position based...
Article
Full-text available
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 examp...
Article
Full-text available
Invasive termites are destructive insect pests that cause billions of dollars in property damage every year. Termite species can be transported overseas by maritime vessels. However, only if the climatic conditions are suitable will the introduced species flourish. Models predicting the areas of infestation following initial introduction of an inva...
Article
Full-text available
The assessment of OpenStreetMap (OSM) data quality has become an interdisciplinary research area over the recent years. The question of whether the OSM road network should be updated through periodic data imports from public domain data, or whether the currency of OSM data should rather rely on more traditional data collection efforts by active con...
Article
Ubiquitous mobile devices, such as smartphones, led to an increased popularity of pedestrian-related routing applications over the past few years. Because pedestrians typically aim to minimize their walking distance, especially in nonrecreational and multimodal trips, pedestrian routing systems will be fully used only if they can find the correct s...
Article
Purpose: The purpose of this study was to identify the association of environmental, managerial, and sociodemographic variables with hiker volume on the Florida National Scenic Trail. Design: Monthly hiker count data from 43 count stations along the Florida National Scenic Trail were used. For each station the characteristics of the built and na...
Article
The analysis and forecasting of extreme climatic events has become increasingly relevant to plan effective financial and food-related interventions in third-world countries. Natural disasters and climate change, both large and small scale, have a great impact on non-industrialized populations who rely exclusively on activities such as crop producti...
Article
Full-text available
This research aims to identify the role of network architecture in influencing individual travel behavior using travel survey data from Minneapolis-Saint Paul and Florida (Fort Lauderdale and Miami). Various measures of network structure, compiled from existing sources, are used to quantify roadway networks, and to capture the arrangement and conne...
Article
Availability of a transit service is a key factor in a traveler's choice of transportation mode. Transit service is a realistic option only if the service is available at or near locations when a person plans to travel. Whereas various measures exist for transit availability such as service frequency, the focus of this study was on the spatial aspe...
Article
Full-text available
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 Florid...
Article
This research analyzes the influence of network structure on household spatial patterns, as measured by activity spaces. The analysis uses street network and travel survey data from the Twin Cities and South Florida to compile measures of network structure. Statistical regression models test the relationship between network structure and travel. Th...
Article
Web 2.0 provides a continuously growing source of volunteered geospatial information through numerous interactive Web applications. It complements geographic information that can be extracted from traditional sources, such as Earth imagery. This paper analyses for a sample of scenic routes whether footprints of geotagged photos posted on Web 2.0 ar...
Article
Based on a user study in the Internet, this research analyses how map design and annotated network information in public transportation maps affect utilized proxy criteria when planning the fastest route in an intra-urban transportation network. Further, it is examined whether annotated network information on schematic maps affects the map reader i...
Article
Full-text available
The objective of this research is to identify the role of network architecture in influencing individual travel behavior using travel survey data from two urban areas in Florida: Fort Lauderdale and Miami. Various measures of network structure, compiled from existing sources, are used to quantify roadway networks, capture the arrangement and connec...
Article
To promote the use of bicycle transportation mode in times of increasing urban traffic congestion, Broward County Metropolitan Planning Organization funded the development of a Web-based trip planner for cyclists. This presentation demonstrates the integration of the ArcGIS Server 9.3 environment with the ArcGIS JavaScript Extension for Google Maps...
Article
Due to countless benefits of cycling as a means of transportation, planning and policy efforts at all levels of governments aim to increase levels of walking and bicycling. Investment in bicycle facilities to improve the Bicycle Level of Service (LOS) is an important ingredient in the mix of governmental initiatives to increase the number of cyclis...
Article
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...
Article
Full-text available
Regionalization has been found to impact human route planning, both when the planning is based on a previously learned environment encoded in memory and when maps are used. This paper presents an experiment in a virtual desktop environment and examines how the length of the path in the start region or goal region impacts ad-hoc route choice, i.e.,...
Chapter
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...
Conference Paper
The purpose of multi-modal route planners is to provide the user with the optimal route between trip start and destination, where the route may utilize several transportation modes including public transportation. The optimal route is defined over a set of evaluation criteria considered by the user during the route selection process. Especially in...
Article
Typically, a route planner application returns one single best route that is visualized on top of a digital map on the output medium, such as a computer screen, GPS device, or PDA, together with a route description. For intuitive route planning we suggest including a pre-computation of various feasible routes as part of the interactive route select...
Conference Paper
Route planners request user input about preferred route characteristics in order to provide the user with the optimal route. Although navigators have a general idea about what constitutes the optimal route, this may be difficult to express in the search interface. Further, the relative importance of route selection criteria for a user often depends...
Article
People use spatial metaphors when they talk about activities on the World Wide Web, such as navigating the Web, reaching one's goal, visiting a Web site, or moving back to a previous Web page. These expressions are mappings from the physical world to an application domain. We analyze why Web users conceptualize clicking on a sequence of Web links a...
Chapter
Query expansion describes the automated process of supplementing a user’s search with additional terms or geographic locations to make it more appropriate for the user’s needs. Such process relies on the system’s knowledge about the relation between geographic terms and places. Geodata repositories host spatial data, which can be queried over their...
Conference Paper
This paper analyses reported difficulties in spatial data retrieval from Internet portals, based on results from an empirical survey. The analysis reveals the problems which cause user dissatisfaction and failure in the search process for spatial data sets. These problems are addressed in a new data search architecture. Within the architecture, the...
Conference Paper
According to choice models in economics, consumer choice can be modeled as a two-stage process, starting with the choice of feasible alternatives, called the screening process, followed by compensatory evaluation of the re- maining alternatives. Although spatial decision support systems used in various application areas support the screening proces...
Article
In this paper the wayfinding criterion always to ‘proceed in the direction of the target’, which is the core of the <?tf=“t906”>least-angle <?tf=“t905”>strategy, is examined. Although human route-selection behavior is much more complex than this, results of empirical studies presented in the literature suggest that preference for most direct direct...
Chapter
Route planners are tools that support the navigator in selecting the best route between two locations. Solving a route choice problem involves sorting and ranking of alternatives according to underlying evaluation criteria and decision rules. Using an appropriate classification of route selection criteria in the user interface is an important ingre...
Conference Paper
This paper presents results from a desktop experiment in which the participants' route selection behavior in an unknown street network is investi- gated. The participants were presented with a series of intersections in a virtual urban desktop environment in field view. Given the task to reach a distant way- finding target that could be seen in the...
Article
Full-text available
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...
Conference Paper
Full-text available
In the physical world, decision making in common navigation strategies is based on a mental map which includes a mental representation of geometric features such as distances and directions between places. We propose that decision making in the web is also based on a mental map. Contrary to the physical world navigation, the mental map used for web...
Article
Full-text available
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 represe...
Article
BIOGRAPHY Research and teaching assistant at the Department of Geoinformation since March 1999, Master's degree in Geodesy, Research interests: Human's mental behavior in a navigation process, search strategies in the real world and webspace, functionality of user interface design ABSTRACT Navigating through an unknown environment is a common task...
Article
This paper proposes a real world navigation method called 'least angle' navigation. During the navigation, the agent acquires the required information merely through perception of the environment. Estimation errors of perceived angles, directions, and distances can occur. We analyze the consequences of estimation errors for the wayfinding process....
Article
Full-text available
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...
Article
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 whe...
Article
Full-text available
In GIS Web applications on an intranet, sharing data among multiple users is a critical component for an effective working environment. However, little attention is given to securing the data from unauthorized access or restricting sensitive information on a need-to-see basis. This research investigates methods in an ArcSDE environment to achieve d...