Use Of Remotely Sensed Imagery From Landsat Multispectoral Scanner
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Data Types and Sources
The study will use remotely sensed imagery from Landsat Multispectoral Scanner (MSS), Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM+) imagery for the periods 1980s, 1990s, 2000s. It will also use Digital Elevation Model (DEM) data from the ASTER satellite for the periods 2010s will be collected and employed for analyzing the spatial and temporal changes in land use land cover in the study area. Water quality data from rivers will be in form of physical-chemical water parameters including temperature, pH, turbidity, conductivity, Biological Oxygen Demand (BOD), and nutrient levels (silicates, nitrogen and phosphorous). Species richness and abundance and total versus fecal coliform bacteria in river water will also be used.
A one week pilot survey will be conducted in the study area, focusing on the areas surrounding Ruiru and Ndarugu Rivers to familiarize the researchers with the area, the people and the topography. Informal interviews will also be conducted to collect information that will assist in the preparation of the main study.
Acquisition of Satellite Imagery
Landsat MSS, TM and ETM+ imagery for the periods 1980s, 1990s, 2000s, and 2010s will be collected and employed for analyzing the spatial and temporal changes in land use land cover in the study area. Other available reference data such as high resolution imagery on Google Earth, aerial photography and topographic maps will be acquired. Food and