Actualization of Vmap 1 Data Using Satellite Imagery (original) (raw)

The goal of the project was to establish an operational workflow to update existing VMap Level 1 data using commercially available satellite imagery. The workflow developed uses both optical and SAR imagery. First, the images are radiometrically enhanced and geocoded. In the second step, different methods for the automatic extraction of area, line and point features are applied. After a raster-vector-conversion, the attributes of the features are assigned interactively. The next step is the GIS validation process, where complex polygons are resolved and the data structure of all features and attributes is checked. The focal point of the update procedure is a semi-automatic feature linking process of the existing VMap1 data and the newly extracted topographic features. This process determines the likeness of linked or unlinked features based on geometry, feature class, attributes and topology. The result of the update procedure is an up-to-date VMap1 data set. The complete workflow w...