Patent ID: 11953872
Assignee: MANNA IRRIGATION LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC A  G  B  Y | IPC B  G

Claim 12:
13. A system for generating crop coefficient (Kc) values for managing agricultural irrigation of a crop in a field and/or a part thereof, the system comprising:
a computing environment, the computing environment comprising:
at least one computer-readable storage medium having computer-executable instructions stored therein and data specifying a crop type, and a boundary of the field and/or the part thereof; and
at least one computer processor operably coupled to at least one computer-readable storage medium and configured by the computer-executable instructions;
wherein the computing environment is able to:
receive remote sensing data from one or more high resolution remote sensors at a time t, wherein the imagery data comprises a plurality of pixels, each pixel is equal to or less than 30 m×30 m;
receive remote sensing data from one or more low resolution remote sensors at time t′, wherein the imagery data comprises at least one pixel, each pixel is greater than 30 m×30 m and is equal or less than 300 m×300 m;
compute a combined near real time combined crop coefficient (CKcNRT(t) by;
computing a high-resolution Kc (HRKc) value for each pixel, the pixel being in its entirety within the boundaries of at least one subplot, using a remote sensing derived index to obtain a plurality of HRKc values;
selecting HRKc values equal to or greater than a number in the range of 0.15 to 0.3 from the plurality of HRKc values, to obtain a first set of selected HRKc values;
computing from the first set of selected HRKc values a first mean HRKc value (HRKc-M1) and a standard deviation (STD);
removing from the first set of validated HRKc values any of which are less than a first threshold being the sum of HRKc-M1 minus one STD to obtain a second set of HRKc values;
removing from the second set of HRKc values any which are greater than a second threshold value being the sum of HRKc-M1 plus two STD's to obtain a third set of HRKc values;
computing from the third set of selected values a second mean HRKc value (HRKc-M2); and
setting the HRKcNRT(t) to equal HRKc-M2;

compute a low resolution near real time Kc value (LRKcNRT) at a time t′ (LRKcNRT(t′)) wherein t′ is between time t to time tnx (t−tnx) by:
receiving remote sensing data from one or more low resolution remote sensors at time t′, wherein the imagery data comprises at least one pixel, each pixel is greater than 30 m*30 m;
selecting at least one pixel having 67% of the pixel data within the boundaries of the field; and
when more than one pixel is selected:
computing Kc value for each pixel using a remote sensing derived index to obtain a first set of LRKc values;
selecting LRKc values equal to or greater than a number in the range of 0.15 to 0.3 from the first set to obtain a second set of selected LRKc values;
computing a mean of the selected Kc values to obtain LRKcNRT-M; and
setting LRKcNRT(t′) to equal LRKcNRT-M;
when one pixel is selected:
computing Kc value for the pixel using a remote sensing derived index; and
when the Kc value is equal to or greater than a number in the range of 0.15 to 0.3, setting the computed Kc value LRKcNRT(t′);

computing CKcNRT during the time period t to tnx (t−tnx):
at time t, setting the CKcNRT to equal the set HRKcNRT(t);
at each time point tx to tnx, with each time point incremented by a discrete time amount of x, computing LRKcNRT(tx−tnx) and setting the CKcNRT to equal the sum of HRKcNRT(t)+[(LRKcNRT(tnx) minus (LRKcNRT(t′)]; optionally the system is further configured to:
generate an actual evapotranspiration (ETa) value;
generate an irrigation recommendation; and
generate as output data, the CKcNRT, ETa, irrigation recommendation or a combination thereof.