This paper introduces combined application of network graphs, 2D image processing and spatial information visualization techniques in order to perform preliminary visual analysis in such tasks as planning, optimization and management of spatial networks (e.g., railroad, air traffic, cargo delivery, etc.). Application of proposed methods is also possible for any kind of analysis that involves exploring spatial relationships between multiple objects that form topological network structure. Definition of general problems in this field is being presented with description of appropriate existing methods for solving them. Theoretical background behind the concept of proposed method is revealed along with evaluation of its application in case studies. Conclusions about current achievements and potential development of this method in the future are also presented.