Livelihood Security: Climate change, conflict and migration in - UNEP

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Annex 5. Summary of datasets used Data sources This table presents the actual datasets and sources that were utilized in the mapping process . Description of the datasets CRU TS 3 .0 – GRIDDED GLOBAL CLIMATE DATA (PRECIPITATION/TEMPERATURE) 86 The CRU TS 3.0 dataset (TS = time series) comprises 1,224 monthly grids of observed climate for the period 1901-2006, covering the global land surface at 0.5 degree resolution. Strengths of the datasets: • continuous in time and space (global coverage) • time-series enables retrospective change analysis (available time-series: 1901-2006) data is freely available via CRU/BADC data portal (restricted to BADC users only) • Weaknesses of the datasets: • datasets are based on climate stations → sparse net of stations in the region of interest available time-series ends in 2006 → up-to-date climate data not available • Livelihood Security: Climate Change, Migration and Conflict in the Sahel
NESDIS-STAR – GRIDDED GLOBAL VEGETATION HEALTH DATA (VHI) The NOAA NESDIS-STAR vegetation health index (VHI) dataset has global coverage at 16 km resolution. It comprises 7-day composite, validated vegetation health data. Strengths of the dataset: • based on measurements of the Advanced Very High Resolution Radiometer (AVHRR) onboard the NOAA satellite → objective, up-to-date and reliable data source • dataset is continuous in space and time (global coverage) • time-series enables retrospective change analysis (available time-series: 1981 to date) • high temporal resolution (weekly dataset) freely available via NESDIS-STAR data portal • Weaknesses of the dataset: • dataset dates back only to 1981 (week 35) from week 36 of 1994 to week 3 of 1995 data is not available due to sensor problems • DFO – MAJOR FLOOD EVENT DATA DFO (Dartmouth Flood Observatory) major flood event data comprises a global time-series (1985- 2010) of major flood events which are represented as approximated polygons. The polygons reflect the estimated areas affected by flood rather than the actual inundated areas. According to DFO, the flood-affected areas (polygons) are delineated based on various sources, such as online news reports, governmental and international relief agency websites and satellite imagery. Strengths of the dataset: • global, up-to-date dataset • time-series enables retrospective change analysis (available time-series: 1985 to date) freely available at DFO website • Weaknesses of the dataset: • dataset does not reflect the actually inundated areas time-series dates back only to 1985 • CSI-CGIAR – SRTM v4 GRIDDED 90 m ELEVATION DATA The SRTM 90 meter Digital Elevation Model (DEM) has a resolution of 90 m at the equator, and is provided in mosaics of 5 degree resolution tiles. Strengths of the dataset: • continuous in space (global coverage) • high spatial resolution (90 m) • vertical accuracy (< 9 m) is much higher than the vertical accuracy of the ASTER GDEM (+/- 20 m) • high quality coastline freely available at CGIAR-CSI SRTM website • Weaknesses of the dataset: • vertical accuracy (< 9 m) is not sufficient to delineate small changes in sea level (cm) AFRICAN POPULATION DATABASE (APD) – GRIDDED AFRICAN POPULATION DATA The population figures of the UNEP African Population Database (APD) represent estimated totals for the standardized years 1960, 1970, 1980, 1990 and 2000 (10-year intervals). Data sources vary by country (censuses, national statistical offices, etc.). The African Population Database provides population count and population density information at a spatial resolution of 2.5 arc minutes. Livelihood Security: Climate Change, Migration and Conflict in the Sahel 87
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Livelihood Security Climate Change,
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Livelihood Security Climate Change,
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Figures Figure 1. Conceptual framew
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Preface by the Permanent Interstate
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Executive Summary “Competition be
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Livelihoods that depend on natural
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tion are regional in nature, and as
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conflict, migration and ultimately
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A young boy tills the soil in Mali,
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Box 1 . Forest-based livelihoods Ma
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Adverse changes in the environment,
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Conflicts in the region have result
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successive droughts, greater rain v
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3. Mapping historical climate trend
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Box 4 . Data limitations A major ch
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Algeria Wadi Irharrhar Arlit ! Agad
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Page 79 and 80: Annexes Annex 1 . Acronyms . . . .
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Page 109 and 110: Annex 10. Acknowledgements Primary
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Livelihood Security: Climate change, conflict and migration in - UNEP

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