Beautiful, precise point clouds and meshes of buildings can be generated by adjusting the gimbal angle from within Site Scan Field. Oblique images can be used standalone or incorporated into the photogrammetry process to include the orthomosaic, mesh, or model that is generated as Nadir imagery is generally not sufficient to build an accurate point cloud of a site that contains vertical surfaces.
To perform a Crosshatch survey, open the Site Scan field app and select the Project you want this job to go into or create a new Project.
Then select “Crosshatch Survey” from the Flight modes screen.
Once on the Map screen you can then change the Survey altitude and Gimbal Angle directly from the Flight settings menu on the right by moving the sliders. When changing the Gimbal Angle, the closer you are to Nadir signifies how much will the camera point directly to the ground i.e. 0 degrees means it will face down.
Make sure you set the angle and altitude of your survey appropriately based on the structure of interest. In this example a crossahatch survey was done in an industrial park with factories so a 200 feet altitude with a 37 degree angle on the Gimbal was set. For oblique image acquisition it’s best to have the Gimbal anywhere between 37 and 45 degrees.
Once you’re done planning out your Crosshatch survey, hit the green “Fly Survey” button on the bottom, and after you go through the Pre Flight checklist, slide the button to the right to take off.
A progress bar on the bottom of the screen indicates the progress of the mission, while the numbers at the bottom shows the number of photos taken vs the number of photos required for the mission. During flight you can pause the mission by pressing the pause button on the bottom right of the screen. After the survey is complete, the aircraft will return straight to home.
After landing, the app will retrieve the flight data from the aircraft. This may take a few seconds to complete.
After the flight data has been retrieved, the app will display the number of photos taken and geotagged.
After the flight data is retrieved, hit the X on the upper left of the screen to go back to our Flight modes menu. Here you will find a notification on the upper left, clicking on this button will open the jobs page
You can rename the job by clicking on the ellipses (…) on the top right. To wirelessly retrieve the images from the camera, press the blue “Get Images” button at the bottom.
After the download is complete, the button changes to an “Upload to 3DR Cloud” button. Connect to the internet to upload the images. After the upload to 3DR is complete, white checkmarks will appear on all the images.
To process the job, log into sitescan.3dr.com and log in using your Site Scan credentials.
Click on the top center of the screen to open a drop down window showing your different Projects. Select the one containing the Job you want to process.
Click on the window at the top left to display a drop down menu showing all the different Jobs available within that Project. You can also use the arrows pointing left and right to scroll between them, they’re ordered by date. Once you select the Job that you want, click on the “Process” button next to the Job window.
This will ask you to log into your Autodesk A360 account. After logging in the processing phase will start. You can tell that the Job is processing by the icon that appears next to the “ortho” section under Data Layers.
After processing is complete, click the Share icon at the top right corner of the screen which will open a window with all the resulting files. Clicking on any one of them will initiate the download of said file.