U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 close



Research
                Research Home
                            National Programs
                            Research Projects
                            Scientific Manuscripts
                            International Engagement
                            Scientific Software/Models
                            Databases and Datasets
                            Office of Scientific Quality Review
            Media
                News & Features
                            Multimedia
                            Briefing Room
                            Down on the Farm
                            Press Room
                            Science in Your Shopping Cart
                            Scientific Discoveries
                            Tellus
                            Under the Microscope
            About ARS
                About ARS Home
                            Staff Directory
                            Labs and Research Centers (Map)
                            Headquarter Offices
                            Organizational Chart
                            Employee Services (REE Employees Only)
                            Office of Outreach, Diversity, and Equal Opportunity
            Work With Us
                Work With Us Home
                            ARS Vacancies at USAJOBS
                            Careers at ARS Information
                            Scientific Collaborations
                            Extramural Agreements
                            1890 Faculty Research Sabbatical ProgramSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            Hunt Jr, Earleitem
                                            Hively, Wells

                                                         - *Dean*item
                                            Daughtry, Craigitem
                                            McCarty, Gregoryitem
                                            FUJIKAWA, S - INTELLITECH MICROSYSTEMSitem
                                            NG, T - INTELLITECH MICROSYSTEMSitem
                                            TRANCHITELLA, MICHAEL - INTELLITECH MICROSYSTEMSitem
                                            LINDEN, DAVID - INTELLITECH MICROSYSTEMSitem
                                            YOEL, DAVID - INTELLITECH MICROSYSTEMS
  Submitted to: Meeting Abstract
                                    Publication Type: Proceedings
                                    Publication Acceptance Date: 10/1/2008
                                    Publication  Date: 11/17/2009
                                    Citation: Hunt, E.R., Hively, W.D., Daughtry, C.S., McCarty, G.W., Fujikawa, S.J., Ng, T.L., Tranchitella, M., Linden, D.S., Yeol, D. 2008. Remote sensing crop leaf area index using unmanned airbone vehicles. In: Proceedings of the 17th William T. Pecora Memorial Remote Sensing Symposium, November 16-20, 2008, Denver, Colorado. Paper 18.Interpretive Summary:
                                Technical Abstract: Remote sensing with unmanned airborne vehicles (UAVs) has more potential for within-season crop management than conventional satellite imagery because: (1) pixels have very high resolution, (2) cloud cover would not prevent acquisition during critical periods of growth, and (3) quick delivery of information to the user is possible.   We  modified  a digital camera to obtain blue, green and near-infrared (NIR) photographs at low cost and without post-processing.  The modified color-infrared digital camera was mounted in a Vector-P UAV (IntelliTech Microsystems, Bowie, Maryland), which was flown at two elevations to obtain a pixel size of 6 cm at 210 m elevation and 3 cm at 115 m elevation. Winter wheat was planted early and late in adjoining fields on the Eastern Shore of Maryland (39° 2’ 2” N, 76° 10’ 36” W).  Each planting was divided into 6 north-south strips with different nitrogen treatments, which created large variation in leaf area index (LAI).  Inspection of the color-infrared photographs revealed large spatial variation in biomass and leaf area index within each treatment strip.  As with most aerial photographs, there were problems in the imagery with lens vignetting and vegetation anisotropy. The green normalized difference vegetation index [GNDVI = (NIR - green)/(NIR + green)] reduced the effect of these image problems and was linearly correlated with leaf area index and biomass.  With very high spatial resolution, pixels in which the soil reflectance dominates can be masked out, and only pure crop pixels could be used to estimate crop nitrogen requirements.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov