An Unmanned Aerial Veichle (UAV) based survey is being conducted for an area which is more or less a flat terrain type. The post processing of the UAV images results into a digital elevation map which shows the height of buildings along with the surrounding agricultural areas.
So, could anyone please suggest the procedure for separation of the surface heights from the raster file to create the actual elevation of the region?
Thank you in advance
Dear Saroj,
I suggest you to see links and attached files on topic.
https://pro.arcgis.com/fr/pro-app/help/data/imagery/generate-elevation-data-using-the-dems-wizard.htm
https://desktop.arcgis.com/fr/arcmap/latest/manage-data/raster-and-images/wkflw-elevation-part1.htm
https://support.dronedeploy.com/docs/elevation
https://gisgeography.com/dem-dsm-dtm-differences/
https://open.canada.ca/data/en/dataset/957782bf-847c-4644-a757-e383c0057995
Article Creating high-resolution bare-earth digital elevation models...
Best regards
Dear Saroj,
Very good results can be obtained using vector information, instead the raster image, in order to get the Digital Elevation of the Terrain. What you can do is a manual or automatic cleaning of the point clouds before the post-processing, in the specific area of your interest. This can be done using Global Mapper software, for instance. Finally, do the procedure as usual to get the raster with the improvements in the heights. Good luck!
Dear Saroj, What SfM software you use? Many of them have a complete workflow chain that includes point classification and terrain extraction. But you need always validate the results obtained. PhotoScan/Metashape is a good option, you can control settings parameters in order to classify terrain points. You can use CloudCompare soft, a free tool very used for the UAV community.
Hi Saroj Kumar Dash, you could work directly with UAV point clouds and exporting them in CloudCompare, after that try to get the DTM using the CSF plugin.
https://www.cloudcompare.org/doc/wiki/index.php?title=CSF_(plugin)
