Hi Piotr, If your only purpose is to find holes in the forest, you can do it using satellite images with a high resolution. And then digitizing... Buying a drone is easy - but flying a drone takes time, experience, time, try and error, learning about regulations ect ect...
You can get so much more information from aerial images captured by a drone: Ortophoto, Surfacemodel, PointCloud and if you use special camera - a vegetation index... From the surface model taken over time, you can calculate growth and canopy cover. From a vegetation index (eg. NVDI you can find unhealthy vegetation). Ect ect.. In September 2016 there was a conference in Krakow http://sigforestry2016.eu just about these topics. So before you start - you have to consider tree things: Accuracy, area and aim for the project. As others have written - With a copter you don´t fly larger areas pr. Battery. With a Phantom 3, on a good day (temp/wind) we fly 15-20 min/battery. With a fixed wing you can fly 1-2 hours / battery. Both can be bought within your budget. Tips for data collection - read this easy page https://www.mapsmadeeasy.com/data_collection If you want absolute accuracy in 3D - you need x, y, z Ground Control Points -. If you want relative accuracy you need 2D (x, y) GCP. For handeling you images into ortophoto, surface model, point cloud, nvdi ect - you can try out a lot of programs. That´s easy - 2-4 weeks free try out. But they all cost a lot of money... You can try out OpenDroneMap. It run on Linux (Try it on a Virtual Machine) - It´s OpenSource - And you can pay what you can afford. That´s the beauty of Open Source. So remember in your budget to spend some money for the Open Source projects too! And in the end you can use QGIS for your data: Point Cloud, Raster Calculator, HillShade, Raster Colorize, Profile tool, LASTool ect. We use all these at our campus. Regards Lene Fischer Associate Professor University of Copenhagen Department of Geoscience and Natural Resource Management Forest and Landscape College Nødebovej 77a 3480 Fredensborg Denmark DIR +45 35331579 MOB +45 40115084 [email protected] www.ign.ku.dk -----Oprindelig meddelelse----- Fra: Qgis-user [mailto:[email protected]] På vegne af Piotr Kania Sendt: 1. december 2016 16:46 Til: [email protected] Emne: [Qgis-user] Drones in forestry Hi! I'm sorry if my question is out of the main topics - my current employer would like to buy drone. They would like to use it for "registration" such things as (for example) - small areas without trees in dense forest, that were cut (it's not a national park, but normal typical forest -> so here we have timber harvest etc.); here is link to Google Maps, that shows what I mean - https://goo.gl/maps/iEPchbrTYyQ2 Normally I (or someone else) must walk with gps receiver, then digitize that "holes" in qgis. The idea is to use drone for that - and here is my question - what would you recommend? - I know the max. acceptable price is about 2300 usd, but it's better to assume 1200 usd. I think my employer would be already happy if such "drone" just make aerial photos that can be used for mapping, I don't think that my company would like to have some 3d data (DEM, DSM). Thanks for any hints _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
