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Botswana International University of Science & Technology (BIUST) 2017

A Spatio-Temporal Assessment of Vegetation Variability and Degradation in Palapye, Botswana Using Normalized Difference Vegetation Index (NDVI) Time Series Data from 1998 to 2016

Kgomo, Margaret Ontibile.

Titre : A Spatio-Temporal Assessment of Vegetation Variability and Degradation in Palapye, Botswana Using Normalized Difference Vegetation Index (NDVI) Time Series Data from 1998 to 2016

Auteur : Kgomo, Margaret Ontibile.

Université de soutenance  : Botswana International University of Science & Technology (BIUST)

Grade : (MSc-Environmental Science 2017

Résumé partiel
Vegetation plays a vital and important role in regulating climate, water balance and energy. This research examines vegetation variability and degradation in semi-arid Palapye, eastern Botswana. These were assessed over an 18 year period (1998 to 2016) using Remote Sensing based Normalized Difference Vegetation Index (NDVI) time series data. NDVI has been widely used as an indicator of vegetation growth because it measures the amount of plant greenness from the spectral responses measured in the red and infrared bands of the electromagnetic spectrum.

The annual variation in vegetation growth cycle, derived as average NDVI from July to June the following year over the study period was assessed. Vegetation anomaly maps identifying how and where vegetation development deviates from the normal in comparison to the long-term average conditions were produced annually and for the year 2015/2016. The latter compared the amount of plant greenness for a particular month relative to the historical average of all years for that particular month. These were indicated as large increase, small increase, no change, large decrease and small decrease.

Vegetation conditions were below the average in 1998/1999 and 2002/2003 which coincided with drought stricken years. For the year 2000/2001, the increase in plant greenness was above the average conditions because of ample rainfall as this year had the highest rainfall ever recorded in Palapye

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Page publiée le 3 juin 2021, mise à jour le 6 juin 2021