Plant density is an important factor affecting rice growth and yield. Because planting methods affect the distribution characteristics of rice in the field, and then cause the difference in density, it is necessary to consider the influence of planting methods in the inversion of rice plant density. Synthetic aperture radar (SAR) has been proved to be one of the important means of rice monitoring due to its advantages of all-day, all-weather and penetrability. Polarimetric SAR not only has the advantages of traditional SAR, but also is very sensitive to target structure and distribution characteristics. It has greater application potential in rice plant density inversion. Based on RADARSAT-2 full polarimetric SAR data, this study fully excavates the polarimetric information, considers the planting methods of transplanting and sowing, and uses the elastic network model to realize the inversion of rice plant density. The results show that polarimetric SAR has a good effect on the inversion of rice plant density. The RMSE of plant density in transplanting and sowing fields is 25 and 39 plants/m2 respectively. Compared with the inversion results without considering planting methods, the accuracy is improved by more than 30%.
XU Jingxuan
,
LI Kun
,
QIN Yi
,
ZHANG Bolin
,
ZHANG Fengli
. Rice plant density inversion using polarimetric SAR considering planting methods[J]. Journal of University of Chinese Academy of Sciences, 2025
, 42(2)
: 167
-175
.
DOI: 10.7523/j.ucas.2023.032
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