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Combining expropriating processes and geographic information systems (GIS) remains a key issue for land management and property system. This demonstration examines the development of a web GIS application as part of a Land Management and Property System that helps an internal bureucracy of Public Power S.A — Hellas (www.dei.gr).
The development of the system was based on open source software tools such as UMN MapServer for map publishing, PostgreSQL and PostGIS for the data management and HTML, PHP and JavaScript as programming languages. In addition, background processes are used in an innovative manner to handle the time consuming and computational costly procedures of the application. Furthermore, a web map service was created to provide maps to other clients such as the Google Maps API v3 that is used as part of the user interface. The output of the application includes maps in vector and raster format, grid files that can be used in a variety desktop GIS software. Furthermore, the system can be easily customized by the final user.

www.evmolpos.gr, www.evmolpos.com, www.vimeo.com/evmolpos

Two months before…

Different innovative systems have been developed and tested in order to prevent a Landslide in lignite open pit mining, in an inexpensive way, with high-resolution images. In this project, one of the most promising acquisition techniques is represented by the use of Unmanned Aerial Vehicles (UAVs) equipped with a high resolution digital camera.
The project deals with the acquisition and processing of low-height aerial imagery acquired by UAVs, in order to provide large-scale mapping to support the field work in lignite open pit mining landslide.
Two months after this work a huge landslide occurred on September 14. There were no fatalities. Geological engineer says this was the largest landslide for all open mining activities in Greece.

To be continued…

Structure from motion (SfM) refers to the process of estimating three-dimensional structures from two-dimensional image sequences which may be coupled with local motion signals. It is studied in the fields of computer vision and digital photogrammetry.
To find correspondence between images, features such as corner points need to be tracked from one image to the next. The feature trajectories over time are then used to reconstruct their 3D positions and the camera’s motion.

www.evmolpos.gr, www.evmolpos.com, www.vimeo.com/evmolpos

Structure ftom motion - Part I …

Structure from motion (SfM) refers to the process of estimating three-dimensional structures from two-dimensional image sequences which may be coupled with local motion signals. It is studied in the fields of computer vision and digital photogrammetry.
To find correspondence between images, features such as corner points need to be tracked from one image to the next. The feature trajectories over time are then used to reconstruct their 3D positions and the camera’s motion.

www.evmolpos.gr, www.evmolpos.com, www.vimeo.com/evmolpos

Newborn Butterflies

UAV (Unmanned Aerial Vehicle) systems became relevant for applications in precision farming, digital photogrammetry, stock piling and in infrastructure maintenance. The advantages of a photogrammetric system on-board of an Unmanned Aerial Vehicle are mostly low cost and flexible and therefore a suitable alternative solution compared to other mobile mapping systems.

With an orthophoto and a DEM derived from aerial images in a scale of 1:5000, a flight planning was build up. The determined flying positions were implemented in the flight control system. Thus, the Uav is able to fly to predefined pathpoints automatically. Tests in Central Macedonia – Greece and the flights in Skydra showed that using the built-in GPS/INS and stabilization units of the flight control system, predefined positions could be reached exactly to acquire the images.

www.evmolpos.com, www.evmolpos.gr, www.vimeo.com/evmolpos

Δόμηση Γεωγραφικού Πληροφοριακού Συστήματος [GIS] και ανάπτυξη εφαρμογών Διαχείρισης ακίνητης περιουσίας στο Λιγνιτικό Κέντρο Μεγαλόπολης [ΛΚΜ] και στο Λιγνιτικό Κέντρο Αλιβερίου.

Ένα Γεωγραφικό Πληροφοριακό Σύστημα αναπτύχθηκε για την υποστήριξη της εσωτερικής γραφειοκρατίας και τη διαχείριση των εταιρικών πόρων (Erp-Gis) στη ΔΕΗ Α.Ε. Το Erp-Gis αφορά το Λιγνιτικό Κέντρο Μεγαλόπολης (ΛΚΜ) και το Λιγνιτικό Κέντρο Αλιβερίου Το σύστημα συνίσταται από υποσυστήματα-εφαρμογές για την επεξεργασία, διαχείριση και οπτικοποίηση των δεδομένων και επικουρικά τη βελτιστοποίηση των διαδικασιών.

Λειτουργικά τα τρία υποσυστήματα είναι: Eταιρικοί πόροι, Μελέτες – Έργα, Απαλλοτριώσεις.
Ένα πλαίσιο διεπαφής (GUI) χρήστη - συστήματος δομήθηκε με λογισμικό ανοιχτού κώδικα και καθιστά το σύστημα Erp-Gis προσβάσιμο από το εταιρικό intranet σε περιβάλλον Web. O εξουσιοδοτημένος χρήστης έχει πρόσβαση στο σύστημα και δύναται να επιτύχει διάδραση, σε παραμέτρους και χωρικά δεδομένα (spatial editing) με επιπλέον δυνατότητα την παραγωγή χαρτών σε Web Τemplate. www.evmolpos.gr, www.evmolpos.com, vimeo.com/evmolpos

Federal, regional, state, county, and local planning agencies have realized the power of enterprise GIS to identify problems, respond to them efficiently, and share the results with the public.
Aeichoros is a web-GIS based application system for the town planners, engineers, bureaucrats and commissioners that is used to automate the day-to-day functioning of all departments and ward offices of Municipal Corporation. Through a web browser any authorized user of corporation will be able to get a visual display of all day-to-day queries, maps and maintenance reports from an open source implementation.

www.evmolpos.gr, www.evmolpos.com, www.vimeo.com/evmolpos

Regional focal mechanisms in the Aegean area determinded by waveform modeling and their Tectonic implication

Focal mechanism parameters of earthquakes with magnitude Mw>5.0 and shallow focal depth (h <40 Km) from Greece and its surroundings have been estimated using the technique of far-field body waveform modeling. We inverted P- and SH- waveforms recorded at stations of the Global Seismograph Network (GSN), with epicentral distances 30o<Δ<90o, using a point source approximation. First motion polarities of P- waveforms recorded at lower epicentral distances were complementary used in order to better constrain the focal mechanisms.

The analysis of these data, combined with the fault plane solutions of 107 earthquakes taken from the literature, can be summarized as follows:

·        Low angle thrust faults dipping to the NE dominate along the coasts of Albania and NW Greece.

·        The southwestern part of the Hellenic arc is characterized by low angle thrust faulting, in some cases combined with a significant strike slip motion, and reverse faults as well.

·         The fault plane solutions of 6 earthquakes (Mw>5.4) that occurred in western Peloponnese show strike-slip motion along nearly vertical fault planes.

·        The widespread strike-slip motion observed in the northern Aegean Sea, which is due to the splay of the North Anatolian Fault into several strands as it enters the Aegean, extends to the south up to the N38o parallel.

·        East-west extension dominates along a narrow zone following the Dinarides-Hellenides mountain belt up to the Rhodes Island in the eastern Hellenic Arc, while continental Greece and southwestern Turkey are characterized by normal faulting along ~E-W trending planes.

(Source: evmolpos.gr)

Τhe Cephalonia Transform Fault and its extension to western Lefkada island (Greece)

The central area of the Ionian Islands is dominated by the existence of a major tectonic structure called the Cephalonia Transform Fault (CTF). Its main part (Cephalonia segment) has been identified by previous work based on the spatial distribution of earthquake foci, fault plane solutions of strong earthquakes, active tectonics, structural studies and geodetic measurements. This part (Cephalonia segment) which exhibits strike-slip motion with a thrust component, strikes in a NE direction, dips SE and has a length of ~90 km. In the present paper information concerning new fault plane solutions, orientation of isoseismals, sea bottom topography and recent GPS results are used to further check the properties of this southern part of the CTF and to explore its northeastward prolongation to Lefkada island. It is shown that the CTF is extended to the western coast of Lefkada. This northern branch (Lefkada segment) of the CTF which is also characterized by strike-slip motion with a thrust component, strikes in a NNE direction, dips to ESE and has a length of ~40 km. These two segments of the CTF form a major kinematic boundary where the slip rate is 2-3 cm/yr.

(Source: evmolpos.gr)

Once upon a time … in the web - Episode ii

Evmolpos company is the technology leader in bringing geographic information systems (GIS) in cloud computing. Evmolpos uses a combination of innovative uav spatial data, mobile data collection technologies and tools for visualization to collect, maintain, integrate and deliver valuable geospatial data quickly and cost effectively. With this geospatial information, Evmolpos empowers clients to make better informed decisions.

(Source: vimeo.com)

Once upon a time … in the web - Episode i

Evmolpos company is the technology leader in bringing geographic information systems (GIS) in cloud computing. Evmolpos uses a combination of innovative uav spatial data, mobile data collection technologies and tools for visualization to collect, maintain, integrate and deliver valuable geospatial data quickly and cost effectively. With this geospatial information, Evmolpos empowers clients to make better informed decisions.

(Source: vimeo.com)

Implementation of Mapserver UMN and effective Open Source Software for spatial management of Land Expropriation

Geographical data services, via internet, require proper management of spatial and non-spatial data. GIS helps in effective analysis and management of spatial data. Spatial data attributes can be efficiently managed using open source based Object Oriented Relational Database Management System (RDBMS). Target of this project was the development of a Web-based system by integrating the Mapserver (UMN), PHP, Apache Web Server, Openlayers, PostGIS and PostgreSQL Object-Relational data-base by adopting a Web based client/server environment. The final system provides a web-based platform for Land expropriation’s procedures in Greece and their implementation at the construction of public works and land management in open pit mining. The end users are specialists, planning agencies, citizens, engineers and private entities. To access the spatial data by the user, a Web browser and Intranet or Internet only, is needed.

(Source: evmolpos.gr)

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