![]() Hope this will you to improve the quality for your DTM. Make sure that you have check the box "Use for DSM and Triangle Mesh": One more thing, if you DTM has some holes you can fill them using the "New Surface" tool: Need to quickly calculate a Ground Sample Distance for your drone flight Feel free to jump straight into the Propeller GSD Calculator we've built for you. DSM, Orthomosaic and Index > DSM and Orthomosaic Then, when you are happy with your classification, you can launch step 3: How to edit the point cloud in the ra圜loud.Make sure that all the points from features you want to preserve are assign to the correct class. If you want to preserve some features, you can keep them by assigning them to the class "Ground". That's why sometimes we would recommend to generate the DTM in the same way you do so for the DSM, but assigning all point from all classes, except "Ground" and "Road Surface", to the class "Disable". Besides as the classification is automatic it might need some manual correction. On the Menu bar, click Process > Generate DTM.ĭuring DTM generation, the disabled points are not definitively removed but rather smoothed which can lead sometimes to certain inconsistencies. DSM, Orthomosaic and Index.Īfter processing step 3. In the Raster DTM Resolution section, select the resolution of the output file.ġ0. (optional) Select Merge Tiles, to merge the individual tiles and generate the DTM in one file.Ĩ. In the section Raster DTM, select the GeoTIFF output file format to generate the DTM.ħ. In this video, our founder CEO, Varun Sarwal will look at how to calculate Ground Sampling Distance (GSD) for drone flights, for both mapping and vertical missions alike. In the section Raster DSM, make sure that the option GeoTIFF and Merge Tiles are selected.Ħ. On the Menu bar, click Process > Processing Options.Ģ. Applies smoothing to points that you assign to the Unclassified, High Vegetation, Building, Human-Made Objects, or any other point class.ĭuring processing step 3.Applies little to no smoothing to points that you assign to the Ground or Road Surface point class.Takes into account all of the points in the densified point cloud except points that you assign to the Disabled point class.Please check each camera's ordering page or main overview details page for each camera's specific fastest capture rates. The "Photo Interval" is very important to follow, as you should not trigger the cameras faster than they can be triggered (since you'll miss shots and possibly have holes in your survey). Typically you want to aim for as fast a shutter speed (higher X) as possible in order to properly expose the subject matter. The lower the X value the brighter the images. "Min Shutter S" is the minimum shutter speed you should use in order to not have blurred pixels. These are the physical height (H) and width (W) on the ground that is captured. To calculate how large an area on the ground the camera sees, look at the "GSD Frame H" and "GSD Frame W" values. The value we calculate is "Front Overlap", meaning in the direction of the top of the sensor. While you can use less overlap we still recommend using 80% or more if possible. ![]() Typically you want to aim for as fast a shutter speed (higher X) as possible in order to properly expose the subject matter. If the UAV flight is high at 214 m above the ground and the cameras focal length is 1.86 um, the image resolution GSD will be 7.4 cm per pixel. GSD = Ground Sampling Distance (in/pixel) ![]() GSD = Ground Sampling Distance (cm/pixel) Camera Flight Calculator Choose Camera Model:
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