This page has only limited features, please log in for full access.
Even though different applications based on Geographic Information Systems (GIS) provide different features and functions, they all share a set of common concepts (e.g., spatial data types, operations, services), a common architecture, and a common set of technologies. Furthermore, common structures appear repeatedly in different GIS, although they have to be specialized in specific application domains. Multilevel modeling is an approach to model-driven engineering (MDE) in which the number of metamodel levels is not fixed. This approach aims at solving the limitations of a two-level metamodeling approach, which forces the designer to include all the metamodel elements at the same level. In this paper, we address the application of multilevel modeling to the domain of GIS, and we evaluate its potential benefits. Although we do not present a complete set of models, we present four representative scenarios supported by example models. One of them is based on the standards defined by ISO TC/211 and the Open Geospatial Consortium. The other three are based on the EU INSPIRE Directive (territory administration, spatial networks, and facility management). These scenarios show that multilevel modeling can provide more benefits to GIS modeling than a two-level metamodeling approach.
Suilen H. Alvarado; Alejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira; Angeles S. Places. Multilevel modeling of geographic information systems based on international standards. Software and Systems Modeling 2021, 1 -44.
AMA StyleSuilen H. Alvarado, Alejandro Cortiñas, Miguel R. Luaces, Oscar Pedreira, Angeles S. Places. Multilevel modeling of geographic information systems based on international standards. Software and Systems Modeling. 2021; ():1-44.
Chicago/Turabian StyleSuilen H. Alvarado; Alejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira; Angeles S. Places. 2021. "Multilevel modeling of geographic information systems based on international standards." Software and Systems Modeling , no. : 1-44.
Providing citizens with the ability to move around in an accessible way is a requirement for all cities today. However, modeling city infrastructures so that accessible routes can be computed is a challenge because it involves collecting information from multiple, large-scale and heterogeneous data sources. In this paper, we propose and validate the architecture of an information system that creates an accessibility data model for cities by ingesting data from different types of sources and provides an application that can be used by people with different abilities to compute accessible routes. The article describes the processes that allow building a network of pedestrian infrastructures from the OpenStreetMap information (i.e., sidewalks and pedestrian crossings), improving the network with information extracted obtained from mobile-sensed LiDAR data (i.e., ramps, steps, and pedestrian crossings), detecting obstacles using volunteered information collected from the hardware sensors of the mobile devices of the citizens (i.e., ramps and steps), and detecting accessibility problems with software sensors in social networks (i.e., Twitter). The information system is validated through its application in a case study in the city of Vigo (Spain).
Miguel R. Luaces; Jesús A. Fisteus; Luis Sánchez-Fernández; Mario Munoz-Organero; Jesús Balado; Lucía Díaz-Vilariño; Henrique Lorenzo. Accessible Routes Integrating Data from Multiple Sources. ISPRS International Journal of Geo-Information 2020, 10, 7 .
AMA StyleMiguel R. Luaces, Jesús A. Fisteus, Luis Sánchez-Fernández, Mario Munoz-Organero, Jesús Balado, Lucía Díaz-Vilariño, Henrique Lorenzo. Accessible Routes Integrating Data from Multiple Sources. ISPRS International Journal of Geo-Information. 2020; 10 (1):7.
Chicago/Turabian StyleMiguel R. Luaces; Jesús A. Fisteus; Luis Sánchez-Fernández; Mario Munoz-Organero; Jesús Balado; Lucía Díaz-Vilariño; Henrique Lorenzo. 2020. "Accessible Routes Integrating Data from Multiple Sources." ISPRS International Journal of Geo-Information 10, no. 1: 7.
The authors wish to make the following corrections to this paper
Daniel Garcia-Gonzalez; Daniel Rivero; Enrique Fernandez-Blanco; Miguel R. Luaces. Correction: Garcia-Gonzalez, D.; Rivero, D.; Fernandez-Blanco, E.; Luaces, M.R. A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors. Sensors 2020, 20, 2200. Sensors 2020, 20, 4650 .
AMA StyleDaniel Garcia-Gonzalez, Daniel Rivero, Enrique Fernandez-Blanco, Miguel R. Luaces. Correction: Garcia-Gonzalez, D.; Rivero, D.; Fernandez-Blanco, E.; Luaces, M.R. A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors. Sensors 2020, 20, 2200. Sensors. 2020; 20 (16):4650.
Chicago/Turabian StyleDaniel Garcia-Gonzalez; Daniel Rivero; Enrique Fernandez-Blanco; Miguel R. Luaces. 2020. "Correction: Garcia-Gonzalez, D.; Rivero, D.; Fernandez-Blanco, E.; Luaces, M.R. A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors. Sensors 2020, 20, 2200." Sensors 20, no. 16: 4650.
In recent years, human activity recognition has become a hot topic inside the scientific community. The reason to be under the spotlight is its direct application in multiple domains, like healthcare or fitness. Additionally, the current worldwide use of smartphones makes it particularly easy to get this kind of data from people in a non-intrusive and cheaper way, without the need for other wearables. In this paper, we introduce our orientation-independent, placement-independent and subject-independent human activity recognition dataset. The information in this dataset is the measurements from the accelerometer, gyroscope, magnetometer, and GPS of the smartphone. Additionally, each measure is associated with one of the four possible registered activities: inactive, active, walking and driving. This work also proposes asupport vector machine (SVM) model to perform some preliminary experiments on the dataset. Considering that this dataset was taken from smartphones in their actual use, unlike other datasets, the development of a good model on such data is an open problem and a challenge for researchers. By doing so, we would be able to close the gap between the model and a real-life application.
Daniel Garcia-Gonzalez; Daniel Rivero; Enrique Fernandez-Blanco; Miguel R. Luaces. A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors. Sensors 2020, 20, 2200 .
AMA StyleDaniel Garcia-Gonzalez, Daniel Rivero, Enrique Fernandez-Blanco, Miguel R. Luaces. A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors. Sensors. 2020; 20 (8):2200.
Chicago/Turabian StyleDaniel Garcia-Gonzalez; Daniel Rivero; Enrique Fernandez-Blanco; Miguel R. Luaces. 2020. "A Public Domain Dataset for Real-Life Human Activity Recognition Using Smartphone Sensors." Sensors 20, no. 8: 2200.
In the last years, software engineering researchers have defined sustainability as a quality requirement of software, but not enough effort has been devoted to develop new methods/techniques to support the analysis and assessment of software sustainability. In this study, we present the Sustainability Assessment Framework (SAF) that consists of two instruments: the software sustainability–quality model, and the architectural decision map. Then, we use participatory and technical action research in close collaboration with the software industry to validate the SAF regarding its applicability in specific cases. The unit of analysis of our study is a family of software products (Geographic Information System- and Mobile-based Workforce Management Systems) that aim to address sustainability goals (e.g., efficient collection of dead animals to mitigate social and environmental sustainability risks). The results show that the sustainability–quality model integrated with the architectural decision maps can be used to identify sustainability–quality requirements as design concerns because most of its quality attributes (QAs) have been either addressed in the software project or acknowledged as relevant (i.e., creating awareness on the relevance of the multidimensional sustainability nature of certain QAs). Moreover, the action–research method has been helpful to enrich the sustainability–quality model, by identifying missing QAs (e.g., regulation compliance, data privacy). Finally, the architectural decision maps have been found as useful to guide software architects/designers in their decision-making process.
Nelly Condori-Fernandez; Patricia Lago; Miguel R. Luaces; Ángeles S. Places. An Action Research for Improving the Sustainability Assessment Framework Instruments. Sustainability 2020, 12, 1682 .
AMA StyleNelly Condori-Fernandez, Patricia Lago, Miguel R. Luaces, Ángeles S. Places. An Action Research for Improving the Sustainability Assessment Framework Instruments. Sustainability. 2020; 12 (4):1682.
Chicago/Turabian StyleNelly Condori-Fernandez; Patricia Lago; Miguel R. Luaces; Ángeles S. Places. 2020. "An Action Research for Improving the Sustainability Assessment Framework Instruments." Sustainability 12, no. 4: 1682.
Web applications development involves managing a high diversity of files and resources like code, pages or style sheets, implemented in different languages. To deal with the automatic generation of custom-made configurations of web applications, industry usually adopts annotation-based approaches despite the majority of studies encourage the use of composition-based approaches to implement Software Product Lines. Recent work tries to combine both approaches to get the complementary benefits. However, technological companies are reticent to adopt new development paradigms such as feature-oriented programming or aspect-oriented programming. Moreover, it is extremely difficult, or even impossible, to apply these programming models to web applications, mainly because of their multilingual nature, since their development involves multiple types of source code (Java, Groovy, JavaScript), templates (HTML, Markdown, XML), style sheet files (CSS and its variants, such as SCSS), and other files (JSON, YML, shell scripts). We propose to use the Common Variability Language as a composition-based approach and integrate annotations to manage fine grained variability of a Software Product Line for web applications. In this paper, we (i) show that existing composition and annotation-based approaches, including some well-known combinations, are not appropriate to model and implement the variability of web applications; and (ii) present a combined approach that effectively integrates annotations into a composition-based approach for web applications. We implement our approach and show its applicability with an industrial real-world system.
José Miguel Horcas Aguilera; Alejandro Cortiñas; Lidia Fuentes; Miguel R. Luaces. Integrating the Common Variability Language with Multilanguage Annotations for Web Engineering. 2020, 1 .
AMA StyleJosé Miguel Horcas Aguilera, Alejandro Cortiñas, Lidia Fuentes, Miguel R. Luaces. Integrating the Common Variability Language with Multilanguage Annotations for Web Engineering. . 2020; ():1.
Chicago/Turabian StyleJosé Miguel Horcas Aguilera; Alejandro Cortiñas; Lidia Fuentes; Miguel R. Luaces. 2020. "Integrating the Common Variability Language with Multilanguage Annotations for Web Engineering." , no. : 1.
LiDAR devices obtain a 3D representation of a space. Due to the large size of the resulting datasets, there already exist storage methods that use compression and present some properties that resemble those of compact data structures. Specifically, LAZ format allows accesses to a given datum or portion of the data without having to decompress the whole dataset and provides indexation of the stored data. However, LAZ format still has some drawbacks that need to be addressed. In this work, we propose a new compact data structure for the representation of a cloud of LiDAR points that supports efficient queries, providing indexing capabilities that are superior to those of the LAZ format.
Susana Ladra; Miguel R. Luaces; José R. Paramá; Fernando Silva-Coira. Space- and Time-Efficient Storage of LiDAR Point Clouds. Transactions on Petri Nets and Other Models of Concurrency XV 2019, 513 -527.
AMA StyleSusana Ladra, Miguel R. Luaces, José R. Paramá, Fernando Silva-Coira. Space- and Time-Efficient Storage of LiDAR Point Clouds. Transactions on Petri Nets and Other Models of Concurrency XV. 2019; ():513-527.
Chicago/Turabian StyleSusana Ladra; Miguel R. Luaces; José R. Paramá; Fernando Silva-Coira. 2019. "Space- and Time-Efficient Storage of LiDAR Point Clouds." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 513-527.
Lately, many companies are using Mobile Workforce Management technologies combined with information collected by sensors from mobile devices in order to improve their business processes. Even for small companies, the information that needs to be handled grows at a high rate, and most of the data collected have a geographic dimension. Being able to visualize this data in real-time within a map viewer is a very important deal for these companies. In this paper we focus on this topic, presenting a case study on visualizing large spatial datasets. Particularly, since most of the Mobile Workforce Management software is web-based, we propose a solution suitable for this environment.
Alejandro Cortiñas; Miguel R. Luaces; Tirso V. Rodeiro. A Case Study on Visualizing Large Spatial Datasets in a Web-Based Map Viewer. Privacy Enhancing Technologies 2018, 296 -303.
AMA StyleAlejandro Cortiñas, Miguel R. Luaces, Tirso V. Rodeiro. A Case Study on Visualizing Large Spatial Datasets in a Web-Based Map Viewer. Privacy Enhancing Technologies. 2018; ():296-303.
Chicago/Turabian StyleAlejandro Cortiñas; Miguel R. Luaces; Tirso V. Rodeiro. 2018. "A Case Study on Visualizing Large Spatial Datasets in a Web-Based Map Viewer." Privacy Enhancing Technologies , no. : 296-303.
In this paper we present the architecture of a system to store, query and visualize on the web large datasets of geographic information. The architecture includes a component to simulate a large number of drivers that report their position on a regular basis, an ingestion component that is generic and can acommodate three different storage technologies, a query component that aggregates the results in order to reduce the query time and the data transfered, and a web-based map viewer. In addition, we define an evaluation methodology to be used to benchmark and compare different alternatives for some components of the system, and we validate the architecture with experiments using a dataset of 40 million locations of drivers.
Alejandro Cortiñas; Miguel R. Luaces; Tirso V. Rodeiro. Storing and Clustering Large Spatial Datasets Using Big Data Technologies. Privacy Enhancing Technologies 2018, 15 -24.
AMA StyleAlejandro Cortiñas, Miguel R. Luaces, Tirso V. Rodeiro. Storing and Clustering Large Spatial Datasets Using Big Data Technologies. Privacy Enhancing Technologies. 2018; ():15-24.
Chicago/Turabian StyleAlejandro Cortiñas; Miguel R. Luaces; Tirso V. Rodeiro. 2018. "Storing and Clustering Large Spatial Datasets Using Big Data Technologies." Privacy Enhancing Technologies , no. : 15-24.
This demo shows the automatic generation of different web-based geographic information systems using a tool based on software product lines engineering. These systems are variant regarding the data domain they can manage and the functionalities they provide. Although the products are different, the set of assets that implement the GIS-related functionalities is the same. These assets are assembled together by our tool depending on the particular requirements of each products. In the demo, we show the behaviour of both the tool generating the products and the products themselves.
Alejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira; Ángeles S. Places. Generation of Web-Based GIS Applications Through the Reuse of Software Artefacts. Privacy Enhancing Technologies 2018, 11 -14.
AMA StyleAlejandro Cortiñas, Miguel R. Luaces, Oscar Pedreira, Ángeles S. Places. Generation of Web-Based GIS Applications Through the Reuse of Software Artefacts. Privacy Enhancing Technologies. 2018; ():11-14.
Chicago/Turabian StyleAlejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira; Ángeles S. Places. 2018. "Generation of Web-Based GIS Applications Through the Reuse of Software Artefacts." Privacy Enhancing Technologies , no. : 11-14.
Nieves R. Brisaboa; Alejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira. Creating Web-Based GIS Applications Using Automatic Code Generation Techniques. Transactions on Petri Nets and Other Models of Concurrency XV 2017, 19 -34.
AMA StyleNieves R. Brisaboa, Alejandro Cortiñas, Miguel R. Luaces, Oscar Pedreira. Creating Web-Based GIS Applications Using Automatic Code Generation Techniques. Transactions on Petri Nets and Other Models of Concurrency XV. 2017; ():19-34.
Chicago/Turabian StyleNieves R. Brisaboa; Alejandro Cortiñas; Miguel R. Luaces; Oscar Pedreira. 2017. "Creating Web-Based GIS Applications Using Automatic Code Generation Techniques." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 19-34.
Nieves R. Brisaboa; Miguel R. Luaces; Cristina Martínez Pérez; Ángeles S. Places. Semantic Trajectories in Mobile Workforce Management Applications. Transactions on Petri Nets and Other Models of Concurrency XV 2017, 100 -115.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, Cristina Martínez Pérez, Ángeles S. Places. Semantic Trajectories in Mobile Workforce Management Applications. Transactions on Petri Nets and Other Models of Concurrency XV. 2017; ():100-115.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; Cristina Martínez Pérez; Ángeles S. Places. 2017. "Semantic Trajectories in Mobile Workforce Management Applications." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 100-115.
In the last years there has been a continuous growth in functionality of geographic information systems (GIS) resulting in many different software artifacts. Even though each GIS is used in different areas with different objectives, they all share many features and requirements and therefore it is possible to apply techniques based on intensive software reuse, such as software product line engineering (SPLE). Although there has been much research on software product line engineering in the last years, the definition of a software product line for the domain of geographic information systems has not been undertaken. In this work we identify the requirements and functionalities of a generic product for a web-based geographic information system, grouping them into commonalities that allow us to reuse many software artifacts, and variabilities that allow use to configure different products. Then, we define the functional and technological architecture of a software product line that uses current technologies for web-based application development. Finally, we design a tool to configure and assemble the components to generate the possible products. The resulting platform is flexible enough to adapt each product to the specific needs of each customer.
Nieves R. Brisaboa; Alejandro Cortiñas; Miguel R. Luaces; Matias Pol’La. A Reusable Software Architecture for Geographic Information Systems Based on Software Product Line Engineering. Transactions on Petri Nets and Other Models of Concurrency XV 2015, 320 -331.
AMA StyleNieves R. Brisaboa, Alejandro Cortiñas, Miguel R. Luaces, Matias Pol’La. A Reusable Software Architecture for Geographic Information Systems Based on Software Product Line Engineering. Transactions on Petri Nets and Other Models of Concurrency XV. 2015; ():320-331.
Chicago/Turabian StyleNieves R. Brisaboa; Alejandro Cortiñas; Miguel R. Luaces; Matias Pol’La. 2015. "A Reusable Software Architecture for Geographic Information Systems Based on Software Product Line Engineering." Transactions on Petri Nets and Other Models of Concurrency XV , no. : 320-331.
Building a digital library of antique documents involves not only technical implementation issues, but also aspects related to the digitization of large collections of documents. Antique documents are usually delicate and need to be handled with care. Also, a poor state of preservation and the use of unrecognizable font types make automatic text recognition more difficult, hence requiring a further human revision to perform text corrections. This makes the participation of experts in the digitization process mandatory and, therefore, costly. In this paper, we present a framework for managing the workflow of the digitization of large collections of antique documents. We describe the digitization process, and a tool supporting all of its phases and tasks. We also present a case study in which we describe how the workflow management system was applied to the digitization of more than 10,000 documents from journals of the 19th century. In addition, we describe the resulting digital library, focusing on the most important technological issues.
Ángeles S. Places; Antonio Fariña; Miguel R. Luaces; Óscar Pedreira; Diego Seco. A workflow management system to feed digital libraries: proposal and case study. Multimedia Tools and Applications 2014, 75, 3843 -3877.
AMA StyleÁngeles S. Places, Antonio Fariña, Miguel R. Luaces, Óscar Pedreira, Diego Seco. A workflow management system to feed digital libraries: proposal and case study. Multimedia Tools and Applications. 2014; 75 (7):3843-3877.
Chicago/Turabian StyleÁngeles S. Places; Antonio Fariña; Miguel R. Luaces; Óscar Pedreira; Diego Seco. 2014. "A workflow management system to feed digital libraries: proposal and case study." Multimedia Tools and Applications 75, no. 7: 3843-3877.
The increasing use of geographic search engines manifests the interest of Internet users in geo-located resources and, in general, in geographic information. This has emphasized the importance of the development of efficient indexes over large geographic databases. The most common simplification of geographic objects used for indexing purposes is a two-dimensional rectangle. Furthermore, one of the primitive operations that must be supported by every geographic index structure is the orthogonal range query, which retrieves all the geographic objects that have at least one point in common with a rectangular query region. In this work, we study several space-efficient representations of rectangle datasets that can be used in the development of geographic indexes supporting orthogonal range queries.
Nieves R. Brisaboa; Miguel R. Luaces; Gonzalo Navarro; Diego Seco. Space-efficient representations of rectangle datasets supporting orthogonal range querying. Information Systems 2013, 38, 635 -655.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, Gonzalo Navarro, Diego Seco. Space-efficient representations of rectangle datasets supporting orthogonal range querying. Information Systems. 2013; 38 (5):635-655.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; Gonzalo Navarro; Diego Seco. 2013. "Space-efficient representations of rectangle datasets supporting orthogonal range querying." Information Systems 38, no. 5: 635-655.
In the last decade, the availability of on-line resources, and also the number of users accessing those resources, has grown exponentially. The information retrieval process, which aims at the improvement of the access to such resources, has been the focus of interest of many researchers. The presence of geographic data in these repositories of information is surprisingly high (for example, note that most of the web pages about business contain information about the locations of their offices). In order to properly manage this geographic data, the information retrieval process has been extended using architectures, data structures, and other techniques developed by the GIS community. This has meant the beginning of a new research field called Geographic Information Retrieval. In this chapter, the authors present a study of the state-of-the-art of this new field, and they also highlight the main open problems that will concentrate efforts during the next years.
Nieves R. Brisaboa; Miguel R. Luaces; Diego Seco. New Discovery Methodologies in GIS. Geographic Information Systems 2013, 358 -376.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, Diego Seco. New Discovery Methodologies in GIS. Geographic Information Systems. 2013; ():358-376.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; Diego Seco. 2013. "New Discovery Methodologies in GIS." Geographic Information Systems , no. : 358-376.
Consistency measures provide an indication on how much a dataset satisfies a set of integrity constraints, which is useful for comparing, integrating and cleaning datasets. This work presents the notion of consistency measures and provides an evaluation of the cognitive adequacy of these measures. It evaluates the impact on the consistency measures of different parameters (overlapping size, external distance, internal distance, crossing length, and touching length) and the relative size of geometries involved in a conflict. While a human-subject testing supports our hypotheses with respect to the parameters, it rejects the significance of the relative size of geometries as a component of the consistency measures.
Nieves R. Brisaboa; Miguel R. Luaces; M. Andrea Rodríguez. Cognitive Adequacy of Topological Consistency Measures. Computer Vision 2011, 6999, 241 -250.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, M. Andrea Rodríguez. Cognitive Adequacy of Topological Consistency Measures. Computer Vision. 2011; 6999 ():241-250.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; M. Andrea Rodríguez. 2011. "Cognitive Adequacy of Topological Consistency Measures." Computer Vision 6999, no. : 241-250.
For software process improvement – SPI – there are few small organizations using models that guide the management and deployment of their improvement initiatives. This is largely because a lot of these models do not consider the special characteristics of small businesses, nor the appropriate strategies for deploying an SPI initiative in this type of organization. It should also be noted that the models which direct improvement implementation for small settings do not present an explicit process with which to organize and guide the internal work of the employees involved in the implementation of the improvement opportunities. In this paper we propose a lightweight process, which takes into account appropriate strategies for this type of organization. Our proposal, known as a “Lightweight process to incorporate improvements”, uses the philosophy of the Scrum agile method, aiming to give detailed guidelines for supporting the management and performance of the incorporation of improvement opportunities within processes and their putting into practice in small companies. We have applied the proposed process in two small companies by means of the case study research method, and from the initial results, we have observed that it is indeed suitable for small businesses.
Francisco J. Pino; Oscar Pedreira; Félix García; Miguel Rodríguez Luaces; Mario Piattini. Using Scrum to guide the execution of software process improvement in small organizations. Journal of Systems and Software 2010, 83, 1662 -1677.
AMA StyleFrancisco J. Pino, Oscar Pedreira, Félix García, Miguel Rodríguez Luaces, Mario Piattini. Using Scrum to guide the execution of software process improvement in small organizations. Journal of Systems and Software. 2010; 83 (10):1662-1677.
Chicago/Turabian StyleFrancisco J. Pino; Oscar Pedreira; Félix García; Miguel Rodríguez Luaces; Mario Piattini. 2010. "Using Scrum to guide the execution of software process improvement in small organizations." Journal of Systems and Software 83, no. 10: 1662-1677.
Both Geographic Information Systems and Information Retrieval have been very active research fields in the last decades. Lately, a new research field called Geographic Information Retrieval has appeared from the intersection of these two fields. The main goal of this field is to define index structures and techniques to efficiently store and retrieve documents using both the text and the geographic references contained within the text. We present in this paper two contributions to this research field. First, we propose a new index structure that combines an inverted index and a spatial index based on an ontology of geographic space. This structure improves the query capabilities of other proposals. Then, we describe the architecture of a system for geographic information retrieval that defines a workflow for the extraction of the geographic references in documents. The architecture also uses the index structure that we propose to solve pure spatial and textual queries as well as hybrid queries that combine both a textual and a spatial component. Furthermore, query expansion can be performed on geographic references because the index structure is based in an ontology.
Nieves R. Brisaboa; Miguel R. Luaces; Ángeles S. Places; Diego Seco. Exploiting geographic references of documents in a geographical information retrieval system using an ontology-based index. GeoInformatica 2010, 14, 307 -331.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, Ángeles S. Places, Diego Seco. Exploiting geographic references of documents in a geographical information retrieval system using an ontology-based index. GeoInformatica. 2010; 14 (3):307-331.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; Ángeles S. Places; Diego Seco. 2010. "Exploiting geographic references of documents in a geographical information retrieval system using an ontology-based index." GeoInformatica 14, no. 3: 307-331.
Searching in metric spaces is a very active field since it offers methods for indexing and searching by similarity in collections of unstructured data. These methods select some objects of the collection as reference objects to build the indexes. It has been shown that the way the references are selected affects the search performance, and several algorithms for good reference selection have been proposed. Most of them assume the space to have a reasonably regular distribution. However, in some spaces the objects are grouped in small dense clusters that can make these methods perform worse than a random selection. In this paper, we propose a new method able to detect these situations and adapt the structure of the index to them. Our experimental evaluation shows that our proposal is more efficient than previous approaches when using the same amount of memory.
Nieves R. Brisaboa; Miguel R. Luaces; Oscar Pedreira; Ángeles S. Places; Diego Seco. Indexing Dense Nested Metric Spaces for Efficient Similarity Search. Transactions on Petri Nets and Other Models of Concurrency XV 2010, 5947, 98 -109.
AMA StyleNieves R. Brisaboa, Miguel R. Luaces, Oscar Pedreira, Ángeles S. Places, Diego Seco. Indexing Dense Nested Metric Spaces for Efficient Similarity Search. Transactions on Petri Nets and Other Models of Concurrency XV. 2010; 5947 ():98-109.
Chicago/Turabian StyleNieves R. Brisaboa; Miguel R. Luaces; Oscar Pedreira; Ángeles S. Places; Diego Seco. 2010. "Indexing Dense Nested Metric Spaces for Efficient Similarity Search." Transactions on Petri Nets and Other Models of Concurrency XV 5947, no. : 98-109.