Dissemination of PS-InSAR results for improved interpretation and analysis

Swati Gehlot(1) , Edward Verbree(1) , and Ramon Hanssen(1)

(1) Technical University Delft, Kluyverweg 1, , 2629 HS Delft, Netherlands

Abstract

Persistent Scatterer Interferometry is currently recognized as an efficient method for detection and monitoring of surface deformation such as land subsidence. The abundance of observations, particularly in urban environments, stresses the capabilities for unambiguous data interpretation. This is due to the fact that the behavior of a single PS can be due to localized effects, such as building instability or local groundwater and geotechnical circumstances, as well as due to wide scale phenomena such as subsidence due to extraction of hydrocarbon.

For these reasons, it is practically impossible for providers of PS results to unambiguously interpret all the data points. On the other hand, for end-users the PS results are often too difficult to interpret as well, since significant knowledge of the technique is needed to prevent over- or under-interpretation of the data. Consequently, the analysis of PS results needs to be performed in close collaboration between the end-users and the providers of the technique.

In this study, the options for optimal dissemination of PS results are considered, aiming at PS information sharing with the user-community. we present a MapServer GIS approach for web publishing of PS-InSAR data results in combination with other geodata.The geo-information combination with PS-InSAR results is done at the server side and the user (client) does not require the installation of a dedicated and (expensive) GIS software for visualizing overlays of information layers. The final interface is simple web browser where the user can visualize and query PS information. Here we use the functionality of open source Mapserver WMS (Web Map Server) to link the GIS database(s) with PS results and serve the user with information about the PS data attributes and time series of the PS. Besides this possibility, freely available viewers and servers (eg. Nasa World Wind, Google Eath, Google Maps etc.) can be used in conjunction with the PS database.

 

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