DJI MINI 2 PHOTOGRAMMETRY WITH THE MAP-CREATOR

so in this video can we can see how we take 3d images with the mini 2 to get results like this one i'm actually in the application blender i use it always at the end so i can fit the size the resolution and also the quality of the the image we can see here it's quite a good result and i will show you step by step how we can do that the most important point is the the mission how we take the pictures in a terror like this you can see that's not a flat terror so it's very important that we have good missions programs and also for the map creator to create elevation mission i always use two missions a 2d flat mission in this case elevation mission and a 3d spherical mission the spherical mission is here to give us a good environment to calculate all the images between and you can also see the elevation mission here on the screen it follows the terra so that's one of the secrets how we get really perfect images but let's start with some theory so important thing for photogrammetry is the overlap we have to get between 40 and 60 overlap also the altitude is very important so we have to take pictures in different altitudes and the pitch angle with -90 degree pitch angle you cannot take the facets from the buildings so one of the best angle is 70 degrees if you have a difficult terror like here it's better to use the elevation mission so you can follow the terror that gives always the same distance to the object the best way is always to combine the missions a 3d spherical mission and a four-way point terra mission so you can choose the security from the right altitude to be near to the object you can also see here on this picture i started near the barn so that changed the whole mission altitude too we can see that later in the app for these vertical images it's important that you also change the distance that's better for the image alignment and also for the texture now let's see how we can create the missions so i'm at home actually i will change the place so you can type the location and then change to the view to satellite and now we can see this barn where i took the picture so here we have different possibilities for the mission 2-d mission 3-d mission inception panorama and vertical mission so we will start with the 2d mission if we will make an elevation mission it's important that you choose european location or world location for the european location i have 25 meter precision for the world location 30 meters so we create the first waypoint it's a yellow whale point with an s which means start second wave point with a t means target so i have here the square then i can stop add waypoints click these vane points and move them and i will change the grid very small grid and i will choose cross paths now what we can see if we have only four waypoints we can switch to 3d and if i switch to 3d we have the elevation of this region so the start point it takes the 60 meters you can find here and then the other points you can see 76 meters and the final point 68 meters so it takes the elevation of this terra now what we can do is change this elevation 60 meter is much too high so the first waypoint will be at 24 meter the second waypoint at 30 the third at 41 and the last at 33. we can change that later when we are flying so one important point is always that we have the start point start point as always the elevation we indicate here in the menu but we can change this start point elevation when we are flying with the aircraft we can also move the whole mission with the aircraft like we can do an offset so that's uh all to create a 2d mission with elevation important that you are on 3d and you take only four waypoints now we can save the pass of this mission it will directly save this mission to the icloud so you can later on pick it up from any iphone or ipad to fly the mission so we give a name i've already saved some barns so i will not save it but you can see it here i've already done it then what we can do is save the camera file that's very important to check it on google earth for waypoint i already did it so i will not do it i will show you later how it looks like onto google earth so in google earth i will create a new project now i can import a mission now you will see it flies onto place with the barn and then we can check this mission it's much too high but that's no problem we can change that later on into the flight app hdr panel with the aircraft already in the air so now you can see it follows the terra now let's see how we create the 3d mission so i'm at an altitude from 24 meter i will change it to 30 meter we can also change that into the hdr panel application when we are flying with the aircraft center point radius so the start point will be at north here at 30 meters it will go up to 59 meters and here with a pitch angle of minus 70 degrees here we have minus 45 and here we have minus 25 degree actually i have photo distance from 25 meter so we will change that every eight meter that gives us 68 images for the whole mission this is actually a mission we cannot do into the lychee app as i use a special mission program into the hdr parlor program but you could use the helix mission that works fine with the lychee app if you have the same procedure you can save the the path of the mission and you can also save the karma file so let's do that i will change this project i will load the new project so and here you can see the 3d mission so you can always check the 3d mission at this point it will be important as we have three trees here but we can also change the middle point of our mission so that we can be aware of this trees here also here this one so always important to check the mission into google earth when we load the mission we can change the altitude and also we've offset the start point with the aircraft in the place so that's very practical so you can move the whole mission and also the whole mission altitude for each mission into the app what we can see here is the 3d mission with the dji mini 2 in virtual stick mode so it's very close to the terra the 24 meter is from the start point from the barn not from the terra here up and this 3-dimension is very important to have good environment images for the photogrammetry process i will speed up the mission so that's the first circle then we go to the second one with different altitude and then change also the pitch angle now the second round with a different pitch angle that's also very important for the photogrammetry process now we go up to the third circle we change the pitch angle again and we have a different altitude which gives us always the same distance to the object then the final point from the nardir and the mission will stop now in the next step i will show you how we load the 2d elevation mission so i have quite a lot missions here so you can see the elevation and now i will fly to the start point of the mission so i can move the mission or also see the altitude and now i will adapt the altitude of the whole mission actually i'm at 30 meters so i go down the loaded mission was about 10 meters and the flight altitude 30 meters so now i can adapt and go near to 10 meters and see if it's possible to do so so even at 18 meters i'm too high so i will decrease the altitude i changed mission lt2 to 13 meters now i will check if it's possible to do so now i will do a simple camera check i have also a start position from my own where i can see the whole mission with the aircraft and i will start the mission i will speed up the mission we can see there's quite a lot of images and the speed is calculated to have enough time to save the images the next step is to create a 3d model from our images so it's quite impressive what we can do with reality capture so it's free you can download it and test it and it's quite impressive what we can do with this program and it's quite fast that's one of the big advantage so if you start with photogrammetry it's one of the right tool to do it here we can see the final result on sketchfab of this barn with metashape now it's up to you to choose what i will do us next from video how to put together the images or how to publish the images on sketch web let me know and thanks for watching you

Channel: Kilian Eisenegger

Views: 49,198

Keywords: 360°, Mini 2, Photogrammetry, map-creator, Methashape, Reality Capture, hdrpano, DJI, Intelligent photogrammetry

Id: ONGgnMkP6-c

Length: 15min 5sec (905 seconds)

Published: Mon Jun 20 2022