Information technology for web application in surveying
Talich, Milan
Fast development of new telecommunication technologies and on-line access to data by means of Internet provide a possibility for creation of new technologies in surveying. First of all these are web services based on standards and applications using these services. The article describes their main principles and presents the advantages and new possibilities coming up from their exploitation. Discussed are web application for analysis of deformations from repeated horizontal survey measurements based on the continuum mechanics and web application for processing of survey sketch. In the XML Web Application to on-line calculation of deformations are derived and described parameters of deformation field (strain tensors, total dilatation) in quadratic network, covering the whole result obtained at individual points of the network in question. Vectors of displacement from repeated - and in several epochs observed - results obtained at individual points of this network are given as input values. The calculation is based on the theory of mechanics of continuum and its basic prerequisite is the homogeneity of the tested territory in question. Application uses Web Map Services (WMS) as its graphic representation of calculated results in the GIS format. Such services enable forming on-line of defined thematic maps in Internet viewer shown in its viewer from data obtained from servers with WMS by user. Thus no geographic data are needed by user to create GIS of his own. Results may be reproduced and observed on a digital terrain model. This makes better evaluation and analysis possible and takes spatial relation of given terrain in consideration, too. The application includes export of results to a series of formats to further using, e.g. as the KML format to Google Earth program. Such application is at disposal to be registered as on-line calculation using Internet to all interested persons.
Only personal, non-commercial use of this document is allowed.