A winter wheat leaf area index inversion method and system
A leaf area index and winter wheat technology, applied in the field of winter wheat growth research, can solve the problems of dependence on spectral information, low inversion accuracy, and no consideration of winter wheat height information, etc., to achieve high inversion accuracy
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Embodiment 1
[0085] figure 1 This is a method flow chart of the method for inversion of the leaf area index of winter wheat in Example 1 of the present invention.
[0086] see figure 1 , the winter wheat leaf area index inversion method includes:
[0087] Step 101: obtain the digital image collected by the drone;
[0088] Step 102: splicing the digital images to obtain corresponding orthophotos and point cloud data;
[0089] Step 103: Calculate the various vegetation indices constructed in the visible light band for the orthophoto;
[0090] Specifically include:
[0091] The green leaf vegetation index GLA (Green leaf algorithm) is calculated using the following formula:
[0092] GLA=(2*G-R-B) / (2*G+R+B)
[0093] The following formula is used to calculate the ExG (Excess green index):
[0094] ExG=2*G-R-B
[0095] The following formula is used to calculate the excess green and super red differential vegetation index ExGR (Excess green minus excess red index):
[0096] ExGR=ExG-1.4*...
Embodiment 2
[0120] This embodiment is described by taking the inversion of the leaf area index of winter wheat in Cang County, Cangzhou City, Hebei Province as an example.
[0121] The growth period of winter wheat in Cangxian County is from October to mid-June of the following year, which is divided into jointing stage, booting stage, flowering stage, grain filling stage, and milk maturity stage. The whole growth period of winter wheat was divided into 3 stages (see Table 1): booting stage (growth stage before booting stage), flowering stage (booting stage to before grain filling) and grain filling stage (growth stage after grain filling). The fertilization and irrigation conditions of winter wheat in the study area were basically the same in each growth period. According to the data collected in this experiment, the inversion of the leaf area index at booting stage of winter wheat was studied.
[0122] Table 1 Phenological history of winter wheat in the study area
[0123]
[0124]...
Embodiment 3
[0146] figure 2 This is the system structure diagram of the third winter wheat leaf area index inversion system according to the embodiment of the present invention.
[0147] see figure 2 , the winter wheat leaf area index retrieval system includes:
[0148] The image acquisition module 201 is used for acquiring the digital image collected by the drone;
[0149] The splicing module 202 is used for splicing the digital image to obtain corresponding orthophoto and point cloud data;
[0150] A vegetation index calculation module 203, configured to calculate various vegetation indices constructed in the visible light band for the orthophoto;
[0151] An index extraction module 204, configured to select any vegetation index whose correlation with the winter wheat leaf area index satisfies a preset condition from a plurality of the vegetation indices, to obtain a first inversion index;
[0152] a height inversion module 205, configured to invert the height of winter wheat acco...
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