From: Soybean iron deficiency chlorosis high-throughput phenotyping using an unmanned aircraft system
Category | Step | Details |
---|---|---|
UAS image collection | Set up UAS | DJI Inspire 1 with Sentera Double 4 K sensor |
Prepare flight path | AgVault mobile app or Pix4D capture app | |
Fly UAS for data collection | 70% image overlap, 61 m altitude | |
Image orthomosaic using Pix4D | Initial processing | Key points extraction and matching, camera model optimization, geolocation |
Point cloud and mesh | Point densification and 3D textured mesh creation, insert ground control points | |
Digital surface model, orthomosaic, and index | Creation of digital surface model, Orthomosaic, reflectance map, and index map | |
Image processing | Plant and soil classification | k-means clustering and recode to plant and soil |
Green, yellow, brown pixel classification | k-means clustering on masked canopy and recode to green, yellow, brown | |
Neural network/random forest with ground data | Subset into training and validation sets, ground-based data is response variable and green, yellow, brown pixel counts are used as features |