VEGETATION INDICES FOR MEASURING MULTILAYER MICROCROP DENSITY AND GROWTH
Disclosed are methods of and systems for producing vegetation information for an area of interest using at least two comparison index values. The comparison index values can be generated based on specific reflectivity characteristics of vegetation relative to non-vegetation.
1 . A method of producing vegetation information comprising:
(a) providing map information that defines an area of interest for which the vegetation information is desired;
(b) providing an imaging system;
(c) taking images across a wavelength spectrum for the area of interest using the imaging system;
(d) recording imaging data relating to the images;
(e) processing the imaging data, wherein the processing comprises generating at least two comparison index values; and
(f) producing the vegetation information using the at least two comparison index values.
2 . (canceled)
3 . The method of claim 1 , wherein the map information comprises topographic information of the area of interest.
4 . The method of claim 1 , wherein the imaging system comprises a digital camera system.
5 . (canceled)
6 . The method of claim 4 , wherein the digital camera system is configured to maintain colorimetric stability over a range of exposure levels from full sunlight to near darkness.
7 . The method of claim 1 , wherein the wavelength spectrum comprises visible light wavelengths.
8 . The method of claim 1 , wherein the wavelength spectrum comprises near infrared wavelengths.
9 . The method of claim 1 , wherein one of the comparison index values is a vegetation index value VI(A−B) defined by the formula VI(A−B)=(reflectance to A−reflectance to B)/(reflectance to A+reflectance to B), wherein A and B are different wavelengths.
10 . The method of claim 9 , wherein the vegetation index value derived is a normalized difference vegetation index (NDVI).
11 .- 17 . (canceled)
18 . The method of claim 1 , wherein one of the comparison index values is a multi layer vegetation index (MLVI).
19 . The method of claim 18 , wherein the MLVI is defined by the formula MLVI=VI(A−B)*VI(B−C)*VI(D−B), wherein A, B, C, and D are different wavelengths.
20 . The method of claim 18 , wherein the MLVI is defined by the formula MLVI=VI(A−B)+VI(B−C)+VI(D−B), wherein A, B, C, and D are different wavelengths.
21 . The method of claim 18 , wherein the MLVI is defined by the formula MLVI=E*VI(A−B)+F*VI(B−C)+G*VI(D−B), wherein A, B, C, and D are different wavelengths, and E, F, and G are coefficients whose values are each independently determined by minimizing the root mean square (rms) error between MLVI and the measured vegetation amount.
22 . (canceled)
23 . The method of claim 18 , wherein the MLVI is defined by the formula MLVI=[(reflectance to A−reflectance to B)+(reflectance to B−reflectance to C)+(reflectance to D−reflectance to B)]/[reflectance to A+reflectance to B+reflectance to C+reflectance to D], wherein A, B, C, and D are different wavelengths.
24 . The method of claim 9 , further comprising correlating the vegetation index value to a physical characteristic of vegetation in the area of interest to produce the vegetation information.
25 . The method of claim 1 , wherein the vegetation information comprises aerial density.
26 . The method of claim 1 , further comprising repeating (c), (d), (e) and (f) after a time interval.
27 . The method of claim 26 , further comprising comparing vegetation information generated before and after the time interval.
28 .- 46 . (canceled)
47 . The system of claim 1 , wherein one of the comparison index values is a multi layer vegetation index (MLVI).
48 .- 58 . (canceled)