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|Title:||Ultra low-level airborne (ULLA) sensing of crop canopy reflectance: A case study using a CropCircle™ sensor||Contributor(s):||Lamb, David (author); Trotter, Mark (author); Schneider, Derek (author)||Publication Date:||2009||DOI:||10.1016/j.compag.2009.07.004||Handle Link:||https://hdl.handle.net/1959.11/3813||Abstract:||Operational airborne and satellite remote sensing in agriculture remains constrained by matching platform availability to suitable daytime weather and illumination conditions, crop development, and availability of ground staff. An ultra low-level aircraft carrying an active NIR/Red CropCircle™ sensor was successfully deployed to record and subsequently map crop vigour via the simple ratio (SR) index over a field of sorghum. Given the logging frequency of ≈20 Hz and the presence of alternate rows of bare soil, the Moiré effect reduced the contrast between crop and bare soil skip-rows. Such effects would not be expected to occur in non-skip-row crops. The ultra low-level airborne (ULLA)-SR map derived from the 20 m transect records compared favorably with the SR map derived from a meter-resolution airborne digital multispectral image that was re-sampled to a similar spatial resolution. This case study, involving a CropCircle™ sensor mounted in a low-level aircraft demonstrates another deployment option for users of this class of sensor. Moreover, an ULLA configuration offers the potential for greater flexibility in scheduling compared to airborne imaging, given it can be flown at any sun-angle, under cloud, at night, and may easily be incorporated into aircraft already conducting low-level operations, for example crop dusting and reconnaissance, over agricultural fields.||Publication Type:||Journal Article||Source of Publication:||Computers and Electronics in Agriculture, 69(1), p. 86-91||Publisher:||Elsevier||Place of Publication:||Amsterdam, The Netherlands||ISSN:||0168-1699||Field of Research (FOR):||070302 Agronomy||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 683
|Appears in Collections:||Journal Article|
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