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Are there any preferred drones for measuring the height and width of buildings? What factors should pilots keep in mind when purchasing a drone? Today's question is from Jannik, who is performing photogrammetry missions and for his requirements needs to measure the height and width of buildings, however he would like to know what drone is best suited for his requirement, a drone that can effortlessly provide accurate measurements We begin our response to Jannik by going over the many requirements of performing a mapping mission and how pilots need to consider them for ensuring quality deliverables. We then delve into accuracy of mapping missions and what factors influence accuracy and how pilots need to keep them in mind while purchasing a drone. We also delve into the technical aspects of performing linear and vertical measurements using a drone and how pilots can effectively use their drone to perform such measurements. Lastly we discuss about the most important driving factor of mapping missions - the cl