The paper discusses the preliminary analysis of an urban availability tool required for preflight flight planning. In this tool, areas in an urban environment are assessed with respect to GNSS availability, separation to traffic and obstacles, impact of UAS noise, and various other criteria. GNSS availability will drive the necessity to include alternative navigation sensors such as laser scanners, vision sensors and altimeters in the navigation mechanization to meet the required navigation performance necessary for urban operations. This paper shows the initial results of the GNSS availability tool and discusses the sensor integration strategy when GNSS-only availability is not sufficient.

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