Free to grow surveys take on two scenarios:
For scenario 1, it is usually sufficient to fly a low elevation video that covers the majority of the stand. From the video you can subjectively tell if the stand is sufficiently stocked and no further action is required. If there is a problem, it is visible in the video and the forester can take action. In this scenario you would send us ESRI shapefiles or KMLs and we would free-fly the drone over each unit and return a high resolution mp4 file for each unit.
For scenario 2, it is necessary to generate a 1" resolution orthophoto (see Harvest Unit Depletion section for more details). When trees reach the free-to-grow stage they are generally large enough to reliably count on an orthophoto with 1" resolution. We use algorithm based autonomous tree counting to stem map the entire unit. We also run transects through the unit to collect species and height and apply the percentages to the trees per acre generated from the stem map.
TimberDrone uses a cloud-based service to count the trees across an entire stand autonomously. A point shapefile is generated which can be used to generate custom reports. This is ideal for 5th year surveys as well as post PCT audits.
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