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The Significance and Sustainability of Charcoal Production in the ...

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<strong>of</strong> susta<strong>in</strong>able development can be conceptually broken <strong>in</strong>to three constituent parts:<br />

environmental susta<strong>in</strong>ability, economic susta<strong>in</strong>ability <strong>and</strong> sociopolitical susta<strong>in</strong>ability.<br />

<strong>The</strong> study is a case study that concentrates to a specific area <strong>and</strong> specific time. O<strong>the</strong>r factors<br />

that relate to a case study are: <strong>the</strong> <strong>in</strong>tensity <strong>of</strong> <strong>the</strong> <strong>in</strong>formation, <strong>in</strong>terest <strong>in</strong> processes, <strong>and</strong> <strong>the</strong><br />

relation between <strong>the</strong> case <strong>and</strong> its' context <strong>and</strong> <strong>the</strong> versatility <strong>of</strong> <strong>the</strong> methods used to acquire<br />

data (Hirsjärvi et al. 2004: 125-126). Qualitative <strong>and</strong> quantitative data can be thus comb<strong>in</strong>ed<br />

<strong>in</strong> a case study. In this study, <strong>the</strong> RS part is ma<strong>in</strong>ly measur<strong>in</strong>g <strong>the</strong> change <strong>of</strong> l<strong>and</strong> cover, which<br />

is atta<strong>in</strong>ed with a quantitative approach. <strong>The</strong> fur<strong>the</strong>r research about <strong>the</strong> causes <strong>and</strong><br />

consequences <strong>of</strong> <strong>the</strong> l<strong>and</strong> cover change are clearly more qualitative <strong>in</strong> <strong>the</strong>ir nature. Hirsjärvi et<br />

al. (2004: 126) cont<strong>in</strong>ue that <strong>the</strong> objective <strong>of</strong> a case study as a research strategy is commonly<br />

to describe phenomena, <strong>in</strong> this case <strong>the</strong> significance <strong>and</strong> susta<strong>in</strong>ability <strong>of</strong> charcoal production<br />

related to social <strong>and</strong> environmental susta<strong>in</strong>ability.<br />

2.2 Data <strong>and</strong> its process<strong>in</strong>g<br />

Data utilized for this study comprises <strong>of</strong> primary data: satellite images <strong>and</strong> GIS data for<br />

spatial analysis; observations, questionnaires, <strong>in</strong>formal communications <strong>and</strong> semi-structured<br />

<strong>in</strong>terviews for detailed socio-economic data collection; <strong>and</strong> <strong>of</strong> secondary data: maps,<br />

household assessments, statistics <strong>and</strong> literature. Two field work periods took place for this<br />

study: first <strong>in</strong> September-October 2010 <strong>and</strong> <strong>the</strong> o<strong>the</strong>r <strong>in</strong> April-May 2011.<br />

GIS ans RS data comprises <strong>of</strong> satellite imagery from SPOT (Le Système Pour l’Observation<br />

de la Terre, Earth Observation System) satellite that was used due to appropriate resolution<br />

<strong>and</strong> access to suitable scenes. O<strong>the</strong>r data used comprises <strong>of</strong> o<strong>the</strong>r GIS data <strong>in</strong>clud<strong>in</strong>g DEM<br />

data, topographical maps <strong>and</strong> soil data. RS <strong>and</strong> GIS data was obta<strong>in</strong>ed both by desk-studies as<br />

well <strong>in</strong>-situ measurements <strong>and</strong> observations. Spatial data, related to charcoal production sites<br />

<strong>and</strong> household locations, for collect<strong>in</strong>g ground truth data <strong>and</strong> ground reference test data for<br />

<strong>the</strong> accuracy assessment, was collected us<strong>in</strong>g Global Position<strong>in</strong>g System (GPS) device<br />

MAGELLAN along visual l<strong>and</strong> cover type observation conducted by foot <strong>and</strong> by car across<br />

<strong>the</strong> area. Nature Kenya <strong>and</strong> A Rocha Kenya provided secondary data for compil<strong>in</strong>g shapefiles<br />

<strong>and</strong> ERDAS IMAGINE 9.2 <strong>and</strong> ENVI s<strong>of</strong>twares were used for deriv<strong>in</strong>g <strong>the</strong> l<strong>and</strong> cover data.<br />

For mapp<strong>in</strong>g purposes <strong>and</strong> analysation ArcGIS 9.3 applications were utilized, <strong>and</strong><br />

observations were marked as sample areas on <strong>the</strong> satellite image pr<strong>in</strong>t with a water-pro<strong>of</strong><br />

marker. Field measurements were used to collect data related to tree species diffusion.<br />

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