3/6/2023 0 Comments Ruler tool gimpIn Figure 3 you can see that the mission is programmed to fly over the edge of the school. The purpose of previewing missions is to verify your code behaves the way you expect and that you are not positioned to fly near potential obstructions. (Note: When using an iPad or iPhone, long tap to set your home point.) If you'd like to change the home location simply drag and drop the home marker to a new location on the map. The mission will be drawn on a Google Map with the home location being Google's estimation of your computer's current location.įigure 3: Map preview of DroneBlocks mission Once your location is determined you will see a mission preview as shown in Figure 3. Figure 2 shows what this screen looks like.įigure 2: Allowing DroneBlocks to access your location "Allow" this access, as this location is used to create a home point for your mission. If you are using DroneBlocks on the desktop you will be asked to share your current location. To point the camera straight down, change the "pitch gimbal" value to -90 degrees. By default the camera is pointed straight forward, which is 0 degrees. The camera should point straight down to the nadir point. The mission in Figure 1 also utilizes the angle of the "pitch gimbal" block. Coding variables allows these changes to happen. Perhaps you want to change the altitude of your shot or the distance flown to another location. In the future you may want to take another nadir shot and it is simple to adjust your variable values. Variable blocks can be included to represent specific values are a great way to make missions more manageable. You will notice that this mission makes use of variables at the top of the program. Program your own mission, relative to your area of interest.įigure 1: DroneBlocks mission for nadir aerial photo Remember this term when determining the angle of your camera.įigure 1 shows a sample mission used to take an aerial shot of the fence line. Nadir is a term used in photogrammetry which describes the view directly below the camera, or aircraft. You must takeoff to a specified altitude, angle the camera into position, take the shot, then land. Now that the area of interest is planned, let us program a basic DroneBlocks mission to take the aerial photo. Our challenge was to find the distance between fences at the back of this property. This photo was shot with our magnificent little DJI Spark using DroneBlocks. If weather conditions do not allow you to get outside to take a photograph, we have included a sample image to use here:Ĭlick here for the full size photo. Make sure the distance between objects is not too far or you won't be able to fly your drone high enough to capture everything in a single photo. Distance from end to end of a track, soccer, or football field.Choose something in the real world that may not be easy to collect measurements using a traditional measuring tape. The first thing we will need to do is determine something in which we would like to measure. There are many applications and interesting outcomes that can be accomplished with data acquired by drones! We feel that it's important to point out that while DroneBlocks makes it easy to capture this type of imagery, the real power is knowing what to do with it. Knowing the pixel distance and some basic information about the camera properties will allow us to calculate distances and areas-no need for old school measuring tape! Photogrammetry is as old as modern photography, dating to the mid-19th century and in the simplest example, the distance between two points that lie on a plane parallel to the photographic image plane, can be determined by measuring their distance on the image, if the scale( s) of the image is known." ( Wikipedia)Īfter taking a photo, students will then use their favorite image editing program (we love GIMP because it's free!) to measure pixel distances. " Photogrammetry is the science of making measurements from photographs, especially for recovering the exact positions of surface points. We will be acquiring a photo that is taken autonomously with DroneBlocks, then use it to calculate distance and area. This lesson will introduce the user to photogrammetry, a fun concept that allows users to make calculations from aerial photography.
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