Deformation analysis of the repeated positional surveys in the undermined localities using web applications and WMS map services

The XML web application for on-line calculations of deformation analysis from the repeated positional surveys using Internet service and data is described. Parameters of deformation field (strain tensors, total dilatation) are determined in a grid network covering the zone of interest. Displacement vectors from repeated measurements at given points of a geodetic network represent the input data of calculation. The calculation is based on application of the theory of continuum mechanics and its fundamental prerequisite is homogeneity of the researched territory. The application currently utilizes the Web Map Services - WMS for the graphic presentation of calculated results as GIS. This service for example enables on-line thematic map composition as defined by the user in the window of Internet explorer based on data given by servers of WMS service. Thus the user does not need to own any geographic data to create his/her GIS. Furthermore there are also given application examples of the repeated geodetic surveys used in the field at localities in the forefront of CSA giant quarry at Komorany and in the undermined territory in Ostrava region. The examples show the independence of calculated values of tensors from rotation and translation of the coordinate systems in practise. This fact gives the evidence that the deformation analysis is more objective dynamic indicator in the researched area and not only the calculus and representation of point displacement vectors. After registration this application is at all interested persons disposal to on-line calculations via the Internet. (authors)