In this paper, novel geospatial services are presented which are able to process on the server-si... more In this paper, novel geospatial services are presented which are able to process on the server-side numerous remote sensing data based on big data frameworks like Hadoop and Rasdaman. The developed system itself features several software modules that orchestrate the different image processing algorithms responsible for the production of consistent value-added maps like canopy greenness and leaf area index. Through distributed multitemporal analysis, the entire crop growth cycle can be continuously monitored through the analysis of time-series observations. These observations cover multiple crop growth cycles, offering invaluable information by linking weather statistical data with the start, the end and the duration of each growth cycle enabling critical decisions by direct comparison with the current crop growth state.
Wageningen Academic Publishers eBooks, Jun 22, 2015
Towards increasing the impact of remote sensing on agronomic management, there is a current need ... more Towards increasing the impact of remote sensing on agronomic management, there is a current need for effective and near-real time processing of earth observation data, which are being delivered with unprecedented coverage, volume and frequency. To this end, a geospatial tool, named RemoteAgri, has been designed and developed for the efficient handling and online, on the server-side, analysis of remote sensing data for precision agriculture applications. In its current version, the developed services which have been implemented through web coverage processing service queries, are addressing important tasks like the calculation of standard vegetation indices, vegetation detection, canopy greenness estimation and land surface temperature mapping. Maps based on multitemporal satellite data, with up to 35 cm spatial resolution, can support rational and comprehensive decisions for precise crop and irrigation management.
This presentation provides an overview of the breadth of quality geospatial open source applicati... more This presentation provides an overview of the breadth of quality geospatial open source applications, which are available for the full range of geospatial use cases, including storage, publishing, viewing, analysis and manipulation of data.The presentation is based upon documentation from OSGeoLive, which is a self-contained DVD, USB thumb drive and Virtual Machine, based on Lubuntu GNU/Linux. ÊIt includes over 50 of the best geospatial, open source applications, pre-configured with data, project overviews and quick-starts, translated into multiple languages. It is an excellent tool for demonstrating Geospatial Open Source, using in tutorials and workshops, or providing to potential new users.This presentation is very useful for anyone wishing to gain a high level understanding of the breadth of Geospatial Open Source available, and is often presented at the start of spatial conferences to help attendees select targeted presentations later in the conference.
OGC and OSGeo have a long history of cooperation, since many years we work together through a Mem... more OGC and OSGeo have a long history of cooperation, since many years we work together through a Memorandum of Understanding, which amongst other aspects provides OSGeo to a certain extend access to the OGC standards development process. The cooperation is meant to bring in requirements, ideas and expertise from the OSGeo community to the OGC programs and processes and provides the OSGeo community with an insight into the current developments of open standards. This presentation gives an insight into the development of xyz software (PyCSW?) and the implementation of the abc standard (CSW?) into the software. How does the standards development work in the OGC? What are the perceived benefits of participating in the Standards Program and why does it matter for open source software developers to contribute to the standards development.
OSGeoLive is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, ... more OSGeoLive is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything. It is composed entirely of free software, allowing it to be freely distributed, duplicated and passed around. It provides pre-configured applications for a range of geospatial use cases, including storage, publishing, viewing, analysis and manipulation of data. It also contains sample datasets and documentation. OSGeoLive is an OSGeo project used in several workshops at FOSS4Gs around the world. OSGeoLive 13.0 will be released at the end of July 2019 ready for FOSS4G 2019. Still working on the improvements initiated for OSGeoLive 12.0, it will embedded latest stable version of a vast choice of Open Source Geospatial software. The work on the geodata science with Python and R stacks have also been continued. Documentation is also a big building area and we made a proposal to Google Season...
This presentation will discuss the implementation of the CSW endpoint using pycsw within the Data... more This presentation will discuss the implementation of the CSW endpoint using pycsw within the Data.gov infrastructure (architecture/enhancements/testing/deployment) and CKAN, which powers Data.gov.CSW (Catalogue Service for the Web) is an OGC (Open Geospatial Consortium) specification that defines common interfaces to discover, browse, and query metadata about data, services, and other potential resources.Data.gov provides access to its catalog via the CSW standard for both first-order and all metadata for harvested data, services and applications. Data may be referenced from federal, state, local, tribal, academic, commercial, or non-profit organizations. The first-order CSW endpoint provides collection level filtering of all metadata records. The all metadata CSW endpoint provides all levels of metadata at varying levels of granularity.Any client supporting CSW (desktop, GIS, web application, client library, etc.) can integrate the Data.gov CSW endpoints.
Bulletin of the Geological Society of Greece, 2017
This paper concerns the study of the seafloor through digital seabed elevation models, using obje... more This paper concerns the study of the seafloor through digital seabed elevation models, using object based image analysis methods. The goal of this research was the automated extraction of geomorphological features from the seabed in regions presenting intense volcanic activity. The study area is located around the submarine volcano of the Kolοumbo (in the submarine area northeast of the Santorini island, Greece). For this purpose, a Digital Elevation Model (DEM) of the seabed with a spatial resolution of 50m was used. Derivatives of the DEM, such us Slope, Topographic Position Index (TPI) and Terrain Ruggedness Index (TRI) were created in the open source software "QGIS 2.4". The implementation of the object based image analysis approach was performed in eCognition 8.7 software. Nine segmentation and classification levels were created in order to produce the final level segmentation "level 5", where the final geomorphological features were classified. The results ...
In this paper, novel geospatial services are presented which are able to process on the server-si... more In this paper, novel geospatial services are presented which are able to process on the server-side numerous remote sensing data based on big data frameworks like Hadoop and Rasdaman. The developed system itself features several software modules that orchestrate the different image processing algorithms responsible for the production of consistent value-added maps like canopy greenness and leaf area index. Through distributed multitemporal analysis, the entire crop growth cycle can be continuously monitored through the analysis of time-series observations. These observations cover multiple crop growth cycles, offering invaluable information by linking weather statistical data with the start, the end and the duration of each growth cycle enabling critical decisions by direct comparison with the current crop growth state.
Towards increasing the impact of remote sensing on agronomic management, there is a current need ... more Towards increasing the impact of remote sensing on agronomic management, there is a current need for effective and near-real time processing of earth observation data, which are being delivered with unprecedented coverage, volume and frequency. To this end, a geospatial tool, named RemoteAgri, has been designed and developed for the efficient handling and online, on the server-side, analysis of remote sensing data for precision agriculture applications. In its current version, the developed services which have been implemented through web coverage processing service queries, are addressing important tasks like the calculation of standard vegetation indices, vegetation detection, canopy greenness estimation and land surface temperature mapping. Maps based on multitemporal satellite data, with up to 35 cm spatial resolution, can support rational and comprehensive decisions for precise crop and irrigation management.
Abstract The aim of this paper was to investigate the development of a fuzzy knowledge base withi... more Abstract The aim of this paper was to investigate the development of a fuzzy knowledge base within an object based image analysis (OBIA) system for automatic change detection of buildings. A multitemporal analysis of very high resolution satellite data (QuickBird and IKONOS) was performed. Two case studies for the Keratea suburb of Athens, Greece were selected. For each dataset, primitive image objects were created through multi-resolution segmentation, in five hierarchical levels, following a mixed top-down strategy established by a trial-and-error procedure. Subsequently each object was assigned by fuzzy classification to one of the classes representing the land cover/use categories of each level. The aim of the classification procedure was to separate the image objects into buildings and not buildings, extract the changes occurring between the two dates, and perform qualitative and quantitative evaluation.
Abstract: The Mediterranean region is facing severe problems of drought and water shortage. Espec... more Abstract: The Mediterranean region is facing severe problems of drought and water shortage. Especially islands and coastal areas are highly vulnerable to water scarcity. For this reason, this study aimed to devise a comprehensive strategic and operational plan to ...
… of ASPRS 2006 Annual Conference, Reno …, 2006
The objective of this research was the development of a generic image segmentation algorithm, as ... more The objective of this research was the development of a generic image segmentation algorithm, as a low level processing part of an integrated object-oriented image analysis system. The implemented algorithm is called Mseg and can be described as a region ...
There is a need to automate terrain feature mapping so that to make the process more objective an... more There is a need to automate terrain feature mapping so that to make the process more objective and less time consuming by using proper feature extraction techniques. The objective of this study was the use of object-oriented image analysis methods for the automatic extraction ...
GeoNode is an open source framework designed to build geospatial content management systems (GeoC... more GeoNode is an open source framework designed to build geospatial content management systems (GeoCMS) and spatial data infrastructure (SDI) nodes. Its development was initiated by the Global Facility for Disaster Reduction and Recovery (GFDRR) in 2009 and adopted by a large number of organizations in the following years. Using an open source stack based on mature and robust frameworks and software like Django, OpenLayers, PostGIS, GeoServer and pycsw, an organization can build on top of GeoNode its SDI or geospatial open data portal. GeoNode provides a large number of user friendly capabilities, broad interoperability using Open Geospatial Consortium (OGC) standards, and a powerful authentication/authorization mechanism. Supported by a vast, diverse and global open source community, GeoNode is an official project of the Open Source Geospatial Foundation (OSGeo).
In this paper, novel geospatial services are presented which are able to process on the server-si... more In this paper, novel geospatial services are presented which are able to process on the server-side numerous remote sensing data based on big data frameworks like Hadoop and Rasdaman. The developed system itself features several software modules that orchestrate the different image processing algorithms responsible for the production of consistent value-added maps like canopy greenness and leaf area index. Through distributed multitemporal analysis, the entire crop growth cycle can be continuously monitored through the analysis of time-series observations. These observations cover multiple crop growth cycles, offering invaluable information by linking weather statistical data with the start, the end and the duration of each growth cycle enabling critical decisions by direct comparison with the current crop growth state.
Wageningen Academic Publishers eBooks, Jun 22, 2015
Towards increasing the impact of remote sensing on agronomic management, there is a current need ... more Towards increasing the impact of remote sensing on agronomic management, there is a current need for effective and near-real time processing of earth observation data, which are being delivered with unprecedented coverage, volume and frequency. To this end, a geospatial tool, named RemoteAgri, has been designed and developed for the efficient handling and online, on the server-side, analysis of remote sensing data for precision agriculture applications. In its current version, the developed services which have been implemented through web coverage processing service queries, are addressing important tasks like the calculation of standard vegetation indices, vegetation detection, canopy greenness estimation and land surface temperature mapping. Maps based on multitemporal satellite data, with up to 35 cm spatial resolution, can support rational and comprehensive decisions for precise crop and irrigation management.
This presentation provides an overview of the breadth of quality geospatial open source applicati... more This presentation provides an overview of the breadth of quality geospatial open source applications, which are available for the full range of geospatial use cases, including storage, publishing, viewing, analysis and manipulation of data.The presentation is based upon documentation from OSGeoLive, which is a self-contained DVD, USB thumb drive and Virtual Machine, based on Lubuntu GNU/Linux. ÊIt includes over 50 of the best geospatial, open source applications, pre-configured with data, project overviews and quick-starts, translated into multiple languages. It is an excellent tool for demonstrating Geospatial Open Source, using in tutorials and workshops, or providing to potential new users.This presentation is very useful for anyone wishing to gain a high level understanding of the breadth of Geospatial Open Source available, and is often presented at the start of spatial conferences to help attendees select targeted presentations later in the conference.
OGC and OSGeo have a long history of cooperation, since many years we work together through a Mem... more OGC and OSGeo have a long history of cooperation, since many years we work together through a Memorandum of Understanding, which amongst other aspects provides OSGeo to a certain extend access to the OGC standards development process. The cooperation is meant to bring in requirements, ideas and expertise from the OSGeo community to the OGC programs and processes and provides the OSGeo community with an insight into the current developments of open standards. This presentation gives an insight into the development of xyz software (PyCSW?) and the implementation of the abc standard (CSW?) into the software. How does the standards development work in the OGC? What are the perceived benefits of participating in the Standards Program and why does it matter for open source software developers to contribute to the standards development.
OSGeoLive is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, ... more OSGeoLive is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything. It is composed entirely of free software, allowing it to be freely distributed, duplicated and passed around. It provides pre-configured applications for a range of geospatial use cases, including storage, publishing, viewing, analysis and manipulation of data. It also contains sample datasets and documentation. OSGeoLive is an OSGeo project used in several workshops at FOSS4Gs around the world. OSGeoLive 13.0 will be released at the end of July 2019 ready for FOSS4G 2019. Still working on the improvements initiated for OSGeoLive 12.0, it will embedded latest stable version of a vast choice of Open Source Geospatial software. The work on the geodata science with Python and R stacks have also been continued. Documentation is also a big building area and we made a proposal to Google Season...
This presentation will discuss the implementation of the CSW endpoint using pycsw within the Data... more This presentation will discuss the implementation of the CSW endpoint using pycsw within the Data.gov infrastructure (architecture/enhancements/testing/deployment) and CKAN, which powers Data.gov.CSW (Catalogue Service for the Web) is an OGC (Open Geospatial Consortium) specification that defines common interfaces to discover, browse, and query metadata about data, services, and other potential resources.Data.gov provides access to its catalog via the CSW standard for both first-order and all metadata for harvested data, services and applications. Data may be referenced from federal, state, local, tribal, academic, commercial, or non-profit organizations. The first-order CSW endpoint provides collection level filtering of all metadata records. The all metadata CSW endpoint provides all levels of metadata at varying levels of granularity.Any client supporting CSW (desktop, GIS, web application, client library, etc.) can integrate the Data.gov CSW endpoints.
Bulletin of the Geological Society of Greece, 2017
This paper concerns the study of the seafloor through digital seabed elevation models, using obje... more This paper concerns the study of the seafloor through digital seabed elevation models, using object based image analysis methods. The goal of this research was the automated extraction of geomorphological features from the seabed in regions presenting intense volcanic activity. The study area is located around the submarine volcano of the Kolοumbo (in the submarine area northeast of the Santorini island, Greece). For this purpose, a Digital Elevation Model (DEM) of the seabed with a spatial resolution of 50m was used. Derivatives of the DEM, such us Slope, Topographic Position Index (TPI) and Terrain Ruggedness Index (TRI) were created in the open source software "QGIS 2.4". The implementation of the object based image analysis approach was performed in eCognition 8.7 software. Nine segmentation and classification levels were created in order to produce the final level segmentation "level 5", where the final geomorphological features were classified. The results ...
In this paper, novel geospatial services are presented which are able to process on the server-si... more In this paper, novel geospatial services are presented which are able to process on the server-side numerous remote sensing data based on big data frameworks like Hadoop and Rasdaman. The developed system itself features several software modules that orchestrate the different image processing algorithms responsible for the production of consistent value-added maps like canopy greenness and leaf area index. Through distributed multitemporal analysis, the entire crop growth cycle can be continuously monitored through the analysis of time-series observations. These observations cover multiple crop growth cycles, offering invaluable information by linking weather statistical data with the start, the end and the duration of each growth cycle enabling critical decisions by direct comparison with the current crop growth state.
Towards increasing the impact of remote sensing on agronomic management, there is a current need ... more Towards increasing the impact of remote sensing on agronomic management, there is a current need for effective and near-real time processing of earth observation data, which are being delivered with unprecedented coverage, volume and frequency. To this end, a geospatial tool, named RemoteAgri, has been designed and developed for the efficient handling and online, on the server-side, analysis of remote sensing data for precision agriculture applications. In its current version, the developed services which have been implemented through web coverage processing service queries, are addressing important tasks like the calculation of standard vegetation indices, vegetation detection, canopy greenness estimation and land surface temperature mapping. Maps based on multitemporal satellite data, with up to 35 cm spatial resolution, can support rational and comprehensive decisions for precise crop and irrigation management.
Abstract The aim of this paper was to investigate the development of a fuzzy knowledge base withi... more Abstract The aim of this paper was to investigate the development of a fuzzy knowledge base within an object based image analysis (OBIA) system for automatic change detection of buildings. A multitemporal analysis of very high resolution satellite data (QuickBird and IKONOS) was performed. Two case studies for the Keratea suburb of Athens, Greece were selected. For each dataset, primitive image objects were created through multi-resolution segmentation, in five hierarchical levels, following a mixed top-down strategy established by a trial-and-error procedure. Subsequently each object was assigned by fuzzy classification to one of the classes representing the land cover/use categories of each level. The aim of the classification procedure was to separate the image objects into buildings and not buildings, extract the changes occurring between the two dates, and perform qualitative and quantitative evaluation.
Abstract: The Mediterranean region is facing severe problems of drought and water shortage. Espec... more Abstract: The Mediterranean region is facing severe problems of drought and water shortage. Especially islands and coastal areas are highly vulnerable to water scarcity. For this reason, this study aimed to devise a comprehensive strategic and operational plan to ...
… of ASPRS 2006 Annual Conference, Reno …, 2006
The objective of this research was the development of a generic image segmentation algorithm, as ... more The objective of this research was the development of a generic image segmentation algorithm, as a low level processing part of an integrated object-oriented image analysis system. The implemented algorithm is called Mseg and can be described as a region ...
There is a need to automate terrain feature mapping so that to make the process more objective an... more There is a need to automate terrain feature mapping so that to make the process more objective and less time consuming by using proper feature extraction techniques. The objective of this study was the use of object-oriented image analysis methods for the automatic extraction ...
GeoNode is an open source framework designed to build geospatial content management systems (GeoC... more GeoNode is an open source framework designed to build geospatial content management systems (GeoCMS) and spatial data infrastructure (SDI) nodes. Its development was initiated by the Global Facility for Disaster Reduction and Recovery (GFDRR) in 2009 and adopted by a large number of organizations in the following years. Using an open source stack based on mature and robust frameworks and software like Django, OpenLayers, PostGIS, GeoServer and pycsw, an organization can build on top of GeoNode its SDI or geospatial open data portal. GeoNode provides a large number of user friendly capabilities, broad interoperability using Open Geospatial Consortium (OGC) standards, and a powerful authentication/authorization mechanism. Supported by a vast, diverse and global open source community, GeoNode is an official project of the Open Source Geospatial Foundation (OSGeo).
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Papers by Angelos Tzotsos