Abstract
The aim of this study is to contribute to the development of a simple and quick methodology of extracting surface energy fluxes and evapo-transpiration, from remote detection data in the Northern-east of National W Park of Niger republic, where based ground data are practically unavailable. The methodology adopted is based on the algorithm METRIC in solving the surface energy balance equation using remotely-sensed data of Landsat7 ETM+ and few ground based data. The algorithm involves NDVI, surface temperature and albedo in the input. The obtained results permit the analysis of surface energy fluxes in function of land occupation/use. Areas subject to severe hydrous stress are identified by analysing the correlation between surface temperature and NDVI. The methodology developed here is an important tool for a diachronic study of surface energy fluxes by using many Landsat7 images. Such study is preponderant for a good management of vegetal and hydrological resources of the Park, which is facing, nowadays, to combined effects of natural climate variability and anthropogenic actions.
Highlights
Spatialization of land surface energy fluxes and evapo-transpiration from remote detection data in visible, near infrared and thermal infrared regions of the electromagnetic spectrum has been at the centre of many meteorological approaches during the last past years
Minimum values correspond to cold pixels and high values to hot pixels. This is appropriate with Temperatures difference, high on dry pixels and very low on cold ones, Table 2; this could be due to the fact that the vegetation areas reduce the surface resistance of evapo-transpiration which resulted in low surface temperature
With data extracted from Landsat7 ETM+ image of November 17, 2002 at 9:55 GMT and few ground based data, the model METRIC has allowed us to spatialize surface energy fluxes and evapo-transpiration, resolving the energy balance equation by using teledetection data essentially
Summary
Spatialization of land surface energy fluxes and evapo-transpiration from remote detection data in visible, near infrared and thermal infrared regions of the electromagnetic spectrum has been at the centre of many meteorological approaches during the last past years. It is necessary to obtain at the large scale, reliable information on land surface fluxes and evapo-transpiration. In Niger, studies using remote data have been conducted in order to improve the management of the park (Couteron, 1992; Benoit, 1998; Inoussa et al, 2011). No study allowing the obtainment of quantitative data of surface energy fluxes and their relationship with the state of the soil has yet been conducted
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Research Journal of Environmental and Earth Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
