Lab CS+X

Laboratory of Interdisciplinary Computer Science

User Tools

Site Tools


public:research

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
Last revision Both sides next revision
public:research [2016/09/08 02:37]
clodoveu
public:research [2016/09/08 22:36]
clodoveu
Line 15: Line 15:
 The volume and variety of geographic data available on the Web for the common citizen are increasing rapidly. Since the onset of Web 2.0, there is much interest on tools that allow people to geographically locate and describe aspects of their daily life, and to share such knowledge with other people. Initial applications show that it is possible to mobilize the interest of large numbers of citizens for the creation, dissemination and maintenance of geographic information on socially relevant themes. This line of research focuses on the design and implementation of computational tools and techniques that allow groups of people to act as human sensors, voluntarily (or unconsciously) contributing information for the common good. The research agenda includes investigating user motivation, data quality, user feedback and spatial coverage of contributions. We also work on methods for active and passive crowdsourcing and crowdsensing,​ seeking the application of recommendation systems to enhance volunteered contributions. The volume and variety of geographic data available on the Web for the common citizen are increasing rapidly. Since the onset of Web 2.0, there is much interest on tools that allow people to geographically locate and describe aspects of their daily life, and to share such knowledge with other people. Initial applications show that it is possible to mobilize the interest of large numbers of citizens for the creation, dissemination and maintenance of geographic information on socially relevant themes. This line of research focuses on the design and implementation of computational tools and techniques that allow groups of people to act as human sensors, voluntarily (or unconsciously) contributing information for the common good. The research agenda includes investigating user motivation, data quality, user feedback and spatial coverage of contributions. We also work on methods for active and passive crowdsourcing and crowdsensing,​ seeking the application of recommendation systems to enhance volunteered contributions.
  
-==== Spatial Databases ====+==== Spatial Databases ​and Geographic Data Modeling ​====
  
-Lorem ipsum dolor sit ametconsectetur adipiscing elitQuisque convallis mauris eget nisl bibendum elementum. Morbi et dui magna. Duis pretium turpis sed lectus consequatin porttitor libero pulvinarProin consequat urna eget molestie finibus. Curabitur pretium porta miat laoreet libero venenatis sit amet. Cras congue nisl ac lobortis congueVestibulum nulla velitauctor sit amet rutrum eucongue at nulla.+The first data models developed for geographic applications were guided by existing GIS internal structuresforcing the user to adjust his/her interpretation of spatial phenomena to whatever structures were availableAs a consequencethe modeling process did not offer mechanisms that would allow for the representation of the reality according to the user's mental modelEven well-known semantic and object-oriented data modelssuch as the Entity-Relationship (ER) model [11], the Object Modeling Technique (OMT) model [39], and the IFO model [1], do not offer adequate facilities to represent geographic applicationsEven though these models are highly expressivethey present limitations to the adequate modeling of such applicationssince they do not include geographic primitives that would allow for a satisfactory representation of spatial data.
  
-==== Geographic Data Modeling ​====+Considering these limitations,​ OMT-G was proposed in 2001, and evolved steadily since. OMT-G is a data model for the design of geographic database systems and applications. OMT-G starts with Unified ​Modeling ​Language (UML) class diagram primitives, introducing geographic primitives in order to enhance UML's semantic representation capabilities,​ thus reducing the distance between the designer'​s mental model of the reality and the usual representation tools. OMT-G provides primitives for modeling the geometric shape and location of geographic objects, supporting spatial and topological relationships,​ “whole-part” structures, networks, and multiple representations. Furthermore,​ the model allows the specification of alphanumeric attributes and methods associated to each class. The model'​s main strong points include its graphical expressivity and its compactness,​ since textual annotations are replaced by pictograms and symbols indicating explicit relationships,​ which are able to denote the dynamic nature of the interaction between spatial and non-spatial objects. From the model, it is also possible to derive spatial integrity constraints,​ specified along with the usual constraints found in conventional database design. Using these assets, the mapping between the conceptual schema and the physical implementation can be executed more soundly and preserving the semantics contained in the higher abstraction level.
  
-Lorem ipsum dolor sit amet, consectetur adipiscing elitQuisque convallis mauris eget nisl bibendum elementum. Morbi et dui magna. Duis pretium turpis sed lectus consequat, ​in porttitor libero pulvinar. Proin consequat urna eget molestie finibus. Curabitur pretium porta miat laoreet libero venenatis sit amet. Cras congue nisl ac lobortis congue. Vestibulum nulla velitauctor sit amet rutrum eucongue at nulla.+OMT-G is the basis for our research on geographic data modelingWe are interested ​in various related themesincluding modeling tools and techniquesspatial integrity constraintsautomatic mapping to physical object-relational implementations and mapping to NoSQL database managers.
  
 ==== Geographic Information Retrieval ==== ==== Geographic Information Retrieval ====
public/research.txt · Last modified: 2016/09/08 23:09 by clodoveu