Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2016-267
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
29 Aug 2016
Review status
A revision of this discussion paper was accepted for the journal Natural Hazards and Earth System Sciences (NHESS) and is expected to appear here in due course.
An Offline-Online WebGIS Android Application for Fast Data Acquisition of Landslide Hazard and Risk
Roya Olyazadeh1, Karen Sudmeier-Rieux1, Michel Jaboyedoff1, Marc-Henri Derron1, and Sanjaya Devkota2 1University of Lausanne, ISTE – Institut des Sci ences de la Terre, Faculté des géosciences et de l'environnement, Lausanne, Switzerland
2Department of Civil Engineering, Institute of Engineering, Tribhuvan University, Kathmandu, Nepal
Abstract. Regional landslide assessments and mapping have been effectively pursued by research institutions, national and local governments, NGOs and different stakeholders for some time; and a wide range of methodologies and technologies are proposed consequently. Land-use mapping and hazard event inventories are mostly created by remote sensing data, resulting in complications subject to accessibility and terrain. However, landslide data acquisition for the field navigation can magnify the accuracy of database and analysis. Analysing hazard patterns and triggering factors can take advantage of Open Source web and mobile GIS tools for an improved ground-truthing of critical areas. This paper reviews implementation of a secure mobile-map application called ROOMA (Rapid Offline-Online Mapping Application) for the fast data collection of landslide hazard and risk. This prototype assists for quick creation of landslide inventory maps by collecting information on the type, feature, volume, date and pattern of the landslide using Open Source web-GIS technologies for instance Leaflet maps, Cordova, GeoServer, Postgis and Postgres database. This application comprises of Leaflet map coupled with satellite images as base layer, drawing tools, geolocation (using GPS and Internet), photo mapping and events clustering. All the features and information are recorded into a Geojson file in an offline version (Android) and consequently uploaded to the online mode (using all browsers) with the availability of internet. Finally, the events can be accessed and edited after approval by an administrator and then be visualized by general public. ROOMA was tested for the collection of landslides in post-earthquake Nepal and can be applied as well for all other events and hazards such as floods, avalanches, etc.

Citation: Olyazadeh, R., Sudmeier-Rieux, K., Jaboyedoff, M., Derron, M.-H., and Devkota, S.: An Offline-Online WebGIS Android Application for Fast Data Acquisition of Landslide Hazard and Risk, Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2016-267, in review, 2016.
Roya Olyazadeh et al.
Roya Olyazadeh et al.

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Short summary
This work shows the progress and testing of an online-offline web-GIS application based on open-source technologies for landslide hazard and risk. It has satellite images as a base map in offline mode and multiple data collection in an online centralized database. The advantage of mobile app coupled with satellite images over mapping in the office is to identify better the type of landslide. This study was used for landslides in Nepal, but, it can be useful for other hazards like floods.
This work shows the progress and testing of an online-offline web-GIS application based on...
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