Detecting Land use/Land cover Change using Remote Sensing & GIS Techniques and Analysis of its Causes ,Consequences and trends in Ofla wereda, Tigray Region, Ethiopia
No Thumbnail Available
Date
2014-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Land use/land cover (LULC) change is one of the challenges which strongly influence
the process of agricultural development. The study intended to carry out land use /land
cover changes, trends and their magnitude over the last 40 years using remote sensing
and GIS and establish the main drivers of land use /land cover change in Ofla wereda of
Tigray region.
For the identification of land use/ land cover change landsat imagery of 1972, 1986 and
2013 were used to determine the change in land use/land cover using object based
classification. In establishing the main drivers of land use/land cover change, the study
utilized household questionnaire and a focus group discussion. A total of 362 respondents
were randomly selected from the kebele’s where the land use/land cover change for the
last 40 years is more than 60%, accordingly Sasela, Zata and Guara Kebeles were
selected which satisfies the criteria. The object based classification result revealed that in
1972 MSS Landsat imagery, crop land (35.8%), grass land (19%), Forest land (43.7%)
and water body (1.5%) were identified with their respective percentage. The change
result showed a rapid reduction in forest cover of -49.2% and +18% increase occurred
between the first (1972-1986) and second (1986-2013) study periods, respectively.
Similarly water body decreased by -11.1% during the first and increased by +9.3% during
the second period. On the contrary, crop land increased in the two periods by 31.7 % and
13.8% respectively.
The analysis of the last 40 years in the study area revealed that about 48% of the
landscape showed changes in LULC. Changes were also analyzed in relation to slope and
agro ecological zone and it showed that in 1972, more than 69.2 % of the crop areas fall
below 20° slope but in 2013 the percentage declined to 54.5% for the same slope
indicating agriculture is expanding to the steep slopes and regarding agro ecological zone
woina dega is more prone to change in the study area. From the analysis of the socio
economic situation of households to identify the underlying causes of the change in land
use/land cover, population growth and land tenure insecurity were identified as the major
underlying causes. This study generally has shown that the recent advancement in spatial
technology can provide a sound mechanism to quantify change at any scale.
Keywords: GIS, LULC, MSS, Remote Sensing
Description
Keywords
GIS, LULC, MSS, Remote Sensing