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Check if the shapefile's spatial index is stale or corrupt. Based on this technical article from ESRI, the shapefile's spatial index maybe corrupted. The technical article offers a solution that may help you solve the problem. Please have a look at it. Another option is to try to export your data to a new shapefile, and see if that solve your problem.


The sky-view factor (SVF) is defined by the part of the visible sky (Ω) above a certain observation point as seen from a two-dimensional representation (see figure a). The algorithm computes the vertical elevation angle of the horizon γi in n (eight are presented here) directions to the specified radius R (b). Sky-view factor has been proposed to overcome ...

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