Dalia E Varanka, PhD
Dr. Varanka, Research Physical Scientist, leads the Geospatial Semantics and Ontology project of the Center of Excellence for Geospatial Information Science.
Dr. Varanka was a research assistant at The Field Museum of Natural History and later at The Newberry Library in Chicago. She started her Federal career at the U.S. Bureau of Land Management in 1993 and has been a Research Grade Evaluation (RGE) scientist since 1998 with the USGS National Geospatial Program. Dr. Varanka taught Geospatial Ontology and Semantics at Johns Hopkins University and is Chair of the Commission on Geospatial Semantics of the International Cartographic Association.
Science and Products
Filter Total Items: 41
The map as knowledge base
This paper examines the concept and implementation of a map as a knowledge base. A map as a knowledge base means that the visual map is not only the descriptive compilation of data and design principles, but also involves a compilation of semantic propositions and logical predicates that create a body of knowledge organized as a map. The digital product of a map as knowledge base can be interprete
Authors
Dalia E. Varanka, E. Lynn Usery
A linked GeoData map for enabling information access
OverviewThe Geospatial Semantic Web (GSW) is an emerging technology that uses the Internet for more effective knowledge engineering and information extraction. Among the aims of the GSW are to structure the semantic specifications of data to reduce ambiguity and to link those data more efficiently. The data are stored as triples, the basic data unit in graph databases, which are similar to the vec
Authors
Logan J. Powell, Dalia E. Varanka
Mapping interactive geospatial linked data
No abstract available.
Authors
William (Contractor) Baumer, Logan J. Powell, Dalia E. Varanka
Book review: Mapping gendered routes and spaces in the early modern world
This book encapsulates and extends many seminal ideas presented at the eighth “Attending to Early Modern Women” conference held at the University of Wisconsin–Milwaukee in June 2012. Merry Wiesner-Hanks has done a masterful job editing these papers within a central theme of the interaction of spatial domains with gender-based phenomena. The fifteen chapters of this book are organized into four sec
Authors
Dalia E. Varanka
Adapting the U.S. National Hydrography Dataset to linked open data
A controlled vocabulary for the National Hydrography Dataset (NHD) of the United States was developed as Linked Open Data (LOD). The vocabulary has two main parts: a glossary and a set of triples reflecting the NHD data model as it is organized in geographic information systems (GIS). The glossary consists of a feature type label and a comment consisting of a definition that is linked to a hydrogr
Authors
Dalia E. Varanka, E. Lynn Usery, David M. Mattli
A case study of data integration for aquatic resources using semantic web technologies
Use cases, information modeling, and linked data techniques are Semantic Web technologies used to develop a prototype system that integrates scientific observations from four independent USGS and cooperator data systems. The techniques were tested with a use case goal of creating a data set for use in exploring potential relationships among freshwater fish populations and environmental factors. Th
Authors
Janice M. Gordon, Nina Chkhenkeli, David L. Govoni, Frances L. Lightsom, Andrea C. Ostroff, Peter N. Schweitzer, Phethala Thongsavanh, Dalia E. Varanka, Stephan Zednik
Complex Topographic Feature Ontology Patterns
Semantic ontologies are examined as effective data models for the representation of complex topographic feature types. Complex feature types are viewed as integrated relations between basic features for a basic purpose. In the context of topographic science, such component assemblages are supported by resource systems and found on the local landscape. Ontologies are organized within six thematic m
Authors
Dalia E. Varanka, Thomas J. Jerris
An applied ontology for semantics associated with surface water land cover
No abstract available.
Authors
Dalia E. Varanka, E. Lynn Usery
Spatial Relation Predicates in Topographic Feature Semantics
Topographic data are designed and widely used for base maps of diverse applications, yet the power of these information sources largely relies on the interpretive skills of map readers and relational database expert users once the data are in map or geographic information system (GIS) form. Advances in geospatial semantic technology offer data model alternatives for explicating concepts and articu
Authors
Dalia E. Varanka, Holly K. Caro
Introduction to geospatial semantics and technology workshop handbook
The workshop is a tutorial on introductory geospatial semantics with hands-on exercises using standard Web browsers. The workshop is divided into two sections, general semantics on the Web and specific examples of geospatial semantics using data from The National Map of the U.S. Geological Survey and the Open Ontology Repository. The general semantics section includes information and access to pub
Authors
Dalia E. Varanka
The use of U.S. Geological Survey digital geospatial data products for science research
The development of geographic information system (GIS) transformed the practice of geographic science research. The availability of low-cost, reliable data by the U.S. Geological Survey (USGS) supported the advance of GIS in the early stages of the transition to digital technology. To estimate the extent of the scientific use of USGS digital geospatial data products, a search of science literature
Authors
Dalia E. Varanka, Carol Deering, Holly Caro
Design and development of linked data from the National Map
The development of linked data on the World-Wide Web provides the opportunity for the U.S. Geological Survey (USGS) to supply its extensive volumes of geospatial data, information, and knowledge in a machine interpretable form and reach users and applications that heretofore have been unavailable. To pilot a process to take advantage of this opportunity, the USGS is developing an ontology for The
Authors
E. Lynn Usery, Dalia E. Varanka
Science and Products
Filter Total Items: 41
The map as knowledge base
This paper examines the concept and implementation of a map as a knowledge base. A map as a knowledge base means that the visual map is not only the descriptive compilation of data and design principles, but also involves a compilation of semantic propositions and logical predicates that create a body of knowledge organized as a map. The digital product of a map as knowledge base can be interprete
Authors
Dalia E. Varanka, E. Lynn Usery
A linked GeoData map for enabling information access
OverviewThe Geospatial Semantic Web (GSW) is an emerging technology that uses the Internet for more effective knowledge engineering and information extraction. Among the aims of the GSW are to structure the semantic specifications of data to reduce ambiguity and to link those data more efficiently. The data are stored as triples, the basic data unit in graph databases, which are similar to the vec
Authors
Logan J. Powell, Dalia E. Varanka
Mapping interactive geospatial linked data
No abstract available.
Authors
William (Contractor) Baumer, Logan J. Powell, Dalia E. Varanka
Book review: Mapping gendered routes and spaces in the early modern world
This book encapsulates and extends many seminal ideas presented at the eighth “Attending to Early Modern Women” conference held at the University of Wisconsin–Milwaukee in June 2012. Merry Wiesner-Hanks has done a masterful job editing these papers within a central theme of the interaction of spatial domains with gender-based phenomena. The fifteen chapters of this book are organized into four sec
Authors
Dalia E. Varanka
Adapting the U.S. National Hydrography Dataset to linked open data
A controlled vocabulary for the National Hydrography Dataset (NHD) of the United States was developed as Linked Open Data (LOD). The vocabulary has two main parts: a glossary and a set of triples reflecting the NHD data model as it is organized in geographic information systems (GIS). The glossary consists of a feature type label and a comment consisting of a definition that is linked to a hydrogr
Authors
Dalia E. Varanka, E. Lynn Usery, David M. Mattli
A case study of data integration for aquatic resources using semantic web technologies
Use cases, information modeling, and linked data techniques are Semantic Web technologies used to develop a prototype system that integrates scientific observations from four independent USGS and cooperator data systems. The techniques were tested with a use case goal of creating a data set for use in exploring potential relationships among freshwater fish populations and environmental factors. Th
Authors
Janice M. Gordon, Nina Chkhenkeli, David L. Govoni, Frances L. Lightsom, Andrea C. Ostroff, Peter N. Schweitzer, Phethala Thongsavanh, Dalia E. Varanka, Stephan Zednik
Complex Topographic Feature Ontology Patterns
Semantic ontologies are examined as effective data models for the representation of complex topographic feature types. Complex feature types are viewed as integrated relations between basic features for a basic purpose. In the context of topographic science, such component assemblages are supported by resource systems and found on the local landscape. Ontologies are organized within six thematic m
Authors
Dalia E. Varanka, Thomas J. Jerris
An applied ontology for semantics associated with surface water land cover
No abstract available.
Authors
Dalia E. Varanka, E. Lynn Usery
Spatial Relation Predicates in Topographic Feature Semantics
Topographic data are designed and widely used for base maps of diverse applications, yet the power of these information sources largely relies on the interpretive skills of map readers and relational database expert users once the data are in map or geographic information system (GIS) form. Advances in geospatial semantic technology offer data model alternatives for explicating concepts and articu
Authors
Dalia E. Varanka, Holly K. Caro
Introduction to geospatial semantics and technology workshop handbook
The workshop is a tutorial on introductory geospatial semantics with hands-on exercises using standard Web browsers. The workshop is divided into two sections, general semantics on the Web and specific examples of geospatial semantics using data from The National Map of the U.S. Geological Survey and the Open Ontology Repository. The general semantics section includes information and access to pub
Authors
Dalia E. Varanka
The use of U.S. Geological Survey digital geospatial data products for science research
The development of geographic information system (GIS) transformed the practice of geographic science research. The availability of low-cost, reliable data by the U.S. Geological Survey (USGS) supported the advance of GIS in the early stages of the transition to digital technology. To estimate the extent of the scientific use of USGS digital geospatial data products, a search of science literature
Authors
Dalia E. Varanka, Carol Deering, Holly Caro
Design and development of linked data from the National Map
The development of linked data on the World-Wide Web provides the opportunity for the U.S. Geological Survey (USGS) to supply its extensive volumes of geospatial data, information, and knowledge in a machine interpretable form and reach users and applications that heretofore have been unavailable. To pilot a process to take advantage of this opportunity, the USGS is developing an ontology for The
Authors
E. Lynn Usery, Dalia E. Varanka