Welcome to

a web-based and mobile ready platform
for visualizing, exploring and interacting with time-evolving linked geospatial data

Some words about Sextant

Sextant is a web based and mobile ready platform for visualizing, exploring and interacting with linked geospatial data. The old version of Sextant, was one of the first visualization tools for linked geospatial data but was focused heavily on the use of SPARQL from the end-user. In the new approach, we re-designed and re-implemented Sextant, focused on creating a user-friendly application that would allow both domain experts and non-experts to take advantage of semantic web technologies, and convince them to adopt these technologies by presenting the benefits of the linked open geospatial Web through the use of Sextant.

The core feature of Sextant is the ability to create thematic maps by combining geospatial and temporal information that exists in a number of heterogeneous data sources ranging from standard SPARQL endpoints, to SPARQL endpoints following the standard GeoSPARQL defined by the Open Geospatial Consortium (OGC), or well-adopted geospatial file formats, like KML, GML and GeoTIFF.

  • Task - Visualize and Explore time-evlolving linked geospatial data
  • Technologies - HTML5, CSS, JavaScript, Java 7, Openlayers 2.13, SIMILE Timeline widget, Bootstrap framework
  • Keywords - data visualization, data exploration, semantic web, linked geospatial data, linked spatiotemporal data, thematic maps

Sample Screenshots

Take a look at our Demos and Publications

In this section you can find some usefull demos that illustrate the capabilities of Sextant to help you build your own maps, and all the publications regarding both the old and the new version of Sextant.

Meet our team


Giorgos Stamoulis

Developer / version 2.0 and Mobile

One machine can do the work of fifty ordinary men. No machine can do the work of one extraordinary man.


Konstantina Bereta

Developer / version 1.0

Bring it on.


Kalliroi Dogani

Developer / version 1.0

Just keep swimming.


Giorgos Garbis

Developer / version 1.0

If you want to go quickly, go alone. If you want to go far, go together.


Manos Karpathiotakis

Developer / version 1.0

La fabrique ne s'arrête pas


Kostis Kyzirakos

Developer / version 1.0

Tilting at windmills.


Charalampos Nikolaou

Developer / version 1.0


Manolis Koubarakis

Professor / National and Kapodistrian University of Athens

Download Sextant

This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

Web Application

Source code:
Pre-built .war file:
Sextant .war file

Mobile Application

Source code:
Mercurial Repository
Pre-built .apk file:
Sextant .apk file

Sextant is used in Projects

Feel free to contact us

We are always trying to improve Sextant and are looking forward to hearing from you for comments and suggestions that will help us improve the available features and add new ones, to assist you in visualizing and exploring linked geospatial data using the advantages of semantic web technologies.