Web-NDefA: Open-source and web-based online platform for 3-D deformation analysis of geodetic networks

The static deformation analysis model and similarity (S)-transformation method are widely used for monitoring deformations in geodetic networks. With this popular analysis method, it is possible to determine the three-dimensional (3D) displacements in geodetic Global Navigation Satellite System (GNSS) deformation networks with high accuracy. However, since the mathematical functions in these methods are numerous and advance, deformation analyses are carried out with academic software that is not easily accessible or with expensive commercial software. Web-based GNSS software is readily available and highly beneficial to users. However, there is a need for a widely accessible web-based software package that can meet the user's requirements. Here, we create a web-based online open-source platform called “Web-NDefA (Web-Based Network Deformation Analysis)” developed using JavaScript libraries for 3D static deformation analysis. The Web-NDefA platform provides an alternative solution for the fast, simple and visual determination of deformations in geodetic GNSS networks. Through this platform, it is possible to detect crustal and landslides movements, determine ground collapses and identify deformations in engineering structures.