"The dataset for this model was acquired within mere 45 minutes by a Pteryx UAV with maximum TOW of 5kg, flying 150m above ground level. The drone carried a consumer grade compact camera (Canon PowerShot S90) and took a total of 541 nadir oriented images. The resultant true 3D model demonstrates Melown Maps ability to capture façades even in the absence of oblique aerial imagery."

The paragraph is about another dataset, not the Brno city dataset.