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
                                            Cammalleri, Carmeloitem
                                            Anderson, Marthaitem
                                            Gao, Fengitem
                                            Schull, Mitchellitem
                                            HOUBORG, RASMUS - Collaboratoritem
                                            Kustas, William

                                                         - *Bill*
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/9/2012
                                    Publication  Date: 5/16/2012
                                    Citation: Cammalleri, C.N., Anderson, M.C., Gao, F.N., Schull, M.A., Houborg, R., Kustas, W.P. 2012. A multi-sensor approach to retrieving high resolution daily evapotranspiration maps [abstract]. Hyperspectral Infrared Imager Symposium, May 16-17, 2012, NASA Goddard Space Flight Center, Greenbelt, MD.Interpretive Summary:
                                Technical Abstract: The use of residual surface energy balance approaches to determine spatially distributed evapotranspiration (ET) over large areas has been considered an effective solution in the last years, especially due to the increasing availability of remotely-observed land-surface temperature (LST) data. However, the current generation of satellite missions does not include sensor characterized by both high spatial resolution (< 100 m) and high repeatability (daily). The new generation of sensors, as the ones on board of HyspIRI mission, certainly improves the availability of high frequency data, but cloud coverage and possible malfunctioning practically limit the actual temporal frequency of land-surface temperature retrieval.

In this context, the integration of data provided by different sensors seems the only suitable alternative to address this problem. In this case study, the use of a multi-scale, multi-sensor approach is analyzed in which the coarse resolution geostationar data (10-km) are used to map ET at the U.S. continental scale via the Atmosphere-Land Exchange Inverse (ALEXI)  model, while the Dis-ALEXI procedure disaggregates ALEXI ET to finer spatial scales using MODIS 1-km (daily) and Landsat 30-m  (16 day) sharpened LST imagery. These latter estimates are fused in order to retrieve daily 30-m ET maps.

A comparison between the estimates obtained by temporally interpolating the Landsat data in isolation and maps derived by the fusion approach allows us to quantify the value added in the introduction of coarse resolution/high frequency estimates in the modeling framework, especially when the theoretical frequency is limited by practical reasons. Moreover, this approach, designed to use the Landsat data is suitable for exploiting HyspIRI mission potentialities after launch.


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