Performance of Global Navigation Satellite System (GNSS) positioning in urban environments is hindered by poor satellite\navailability because there are many man-made and natural objects in urban environments that obstruct satellite signals. To evaluate\nthe availability of GNSS in cities, this paper presents a software simulation of GNSS availability in urban areas using a panoramic\nimage dataset from Google Street View. Photogrammetric image processing techniques are applied to reconstruct fisheye sky view\nimages and detect signal obstacles. Two comparisons of the results fromthe simulation and real world observation in Bangkok and\nTokyo are also presented and discussed for accuracy assessment.
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