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Analysing vegetation changes in the Sahel using sensor data from Landsat and NOAA

Eklundh, Lars LU orcid and Sjöström, Martin LU (2005) 31st International Symposium on Remote Sensing of Environment, ISRSE 2005: Global Monitoring for Sustainability and Security
Abstract

The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas in the Sudan, Central African Republic, Niger, Mali and Mauritania. Changes in the Landsat data were analysed by visual interpretation and change vector analysis. In areas of positive AVHRR NDVI change the analysis of Landsat data generally showed a transition from barren or sparse vegetation to a denser vegetation cover. Rainfall had increased over the course of time in several... (More)

The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas in the Sudan, Central African Republic, Niger, Mali and Mauritania. Changes in the Landsat data were analysed by visual interpretation and change vector analysis. In areas of positive AVHRR NDVI change the analysis of Landsat data generally showed a transition from barren or sparse vegetation to a denser vegetation cover. Rainfall had increased over the course of time in several of these areas. In some areas visual interpretation indicated an expansion of agricultural land.

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author
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organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Africa, Change vector analysis, Landsat, NOAA NDVI, Sahel, Vegetation change
conference name
31st International Symposium on Remote Sensing of Environment, ISRSE 2005: Global Monitoring for Sustainability and Security
conference location
St. Petersburg, Russian Federation
conference dates
2005-06-20 - 2005-06-24
external identifiers
  • scopus:84879706198
language
English
LU publication?
yes
id
280672f3-689a-4cf9-8e71-33177cd1a3b8
date added to LUP
2020-04-07 22:32:59
date last changed
2021-03-24 03:22:21
@misc{280672f3-689a-4cf9-8e71-33177cd1a3b8,
  abstract     = {<p>The semi-arid Sahel zone of Africa has suffered several periods of severe drought since about 1950. We have analyzed AVHRR Normalized Difference Vegetation Index (NDVI) over the Sahel for the period 1982-2002, and found extensive areas of increasing NDVI. To verify these changes we have analyzed Landsat TM and ETM+ scenes from 1984-1986 and 1999-2001 for areas in the Sudan, Central African Republic, Niger, Mali and Mauritania. Changes in the Landsat data were analysed by visual interpretation and change vector analysis. In areas of positive AVHRR NDVI change the analysis of Landsat data generally showed a transition from barren or sparse vegetation to a denser vegetation cover. Rainfall had increased over the course of time in several of these areas. In some areas visual interpretation indicated an expansion of agricultural land.</p>},
  author       = {Eklundh, Lars and Sjöström, Martin},
  language     = {eng},
  month        = {12},
  title        = {Analysing vegetation changes in the Sahel using sensor data from Landsat and NOAA},
  year         = {2005},
}