Altitude Check

• Before we start flying we need to make sure that there is no obstacle in the route we planed before. Although we can carefully plane the route so that we cannot hit the buildings, but it is really risky and time consuming, the easiest way is that we can increase the height of the drone until there is higher than any buildings. Remember that the lidar data usually will be preserve when the distance between lidar and target is lower than 250. Which means that the drone’s flying height is around 150 at most (if u r using oblique shooting skills)

• To check the altitude, you need to first find the highest building by naked eyes and then start to use the drone to check

• In the fpv windows you will find where the horizontal line is and you can find the ALT and horizontal line as the following graph illustrate:

  The ALT shows the altitude of height of the building if it aligns with the root top of that building

• Remember that the altitude is no the absolute altitude, it is the altitude relative to your take off altitude

Data Collection Range

• Do not collect a large amount of data in one flight, this is because that the data processing software has its limit and we might could not load the data properly if the data is too large
• If one is using oblique shooting, the normal size of the point cloud is just use up your battery for one time(this could contains 5 routes for the area you design). Around 3/4 of the upper campus of CUHKSZ