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5.30 THE RISK OF FARMING IN DIFFERENT AREAS |
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Data ID |
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Description: |
Risk of farming in different areas based on a synthesis of rainfall and vegetation production |
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Chapter: |
5 Land and History |
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File name: |
The risk of farming in different areas |
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File type: |
Arcview shapefile |
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Geographical area: |
Namibia |
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Keywords: |
risk |
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farming |
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Notes on data, analysis and |
A perspective on risk of farming in Namibia based on a synthesis of information on average rainfall (Figure 3.18), |
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compilation: |
variation in rainfall (Figure 3.21), average plant production (Figure 4.6) and variation in plant production (Figure 4.7). |
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It therefore takes account of both actual levels of rainfall and plant production and the degree of variability in an area. |
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Average rainfall: |
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values for grid cells were converted to a percentage using the cell with the highest value as the denominator. These |
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values were then inverted using the formula (100-cell value) so that areas with high rainfall have a low value and areas |
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with low rainfall have a high value. |
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Average plant production: |
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values for grid cells were converted to a percentage using the cell with the highest value as the denominator. These |
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values were then inverted using the formula (100-cell value) so that areas with high production have a low value and |
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areas with low production have a high value. |
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Variation in rainfall and variation in plant production: |
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In both cases, values for grid cells were converted to a percentage using the cell with the highest value as the |
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denominator. Cells with high values reflect areas with high variation |
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The resulting 4 grid files (each with values on a scale from 0-100) were summed to produce one grid file with values |
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ranging from 0 - 400 (maximum). This provides a relative measure of risk as those areas having high values are in |
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general, areas with low rainfall, low plant production and high variability in rainfall and plant production. |
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The scale 0- 400 was summarised into 7 class intervals which allowed a relative ranking to be made of high to low risk |
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areas and a smoothed shapefile was created from the grid file. |
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Data quality and organisation |
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Positional Accuracy: |
Very generalised |
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Vector/Raster: |
Vector |
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Spatial reference |
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Projection: |
Geographic |
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Fields |
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Field name |
Field description |
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RISKY |
Scale of 1 to 7 indicating high (1) to low (7) risk |
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Source/Distribution |
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Data Source: |
Atlas of Namibia |
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Distribution notes: |
Unrestricted |
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5.30 THE RISK OF FARMING IN DIFFERENT AREAS - PREDICTED RAINFALL |
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CHANGES |
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Data ID |
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Description: |
Predicted rainfall over Namibia and southern Africa |
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Chapter: |
5 Land and History |
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Geographical area: |
southern Africa |
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Keywords: |
climate |
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predicted |
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rainfall |
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change |
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Notes on data, analysis and |
Created by digitising from an image published in: Hadley Centre. 2001. Hadley Centre regional climate modelling |
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compilation: |
system. Met Office, London. For data contact the Hadley centre (see source). |
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Source/Distribution |
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Data Source: |
Hadley Centre |
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Contact: |
Hadley Centre |
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Online/Offline Address: |
London Road |
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Bracknell |
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Berkshire |
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RG12 2SY |
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UK |
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www.metoffice.com |
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Distribution notes: |
Unrestricted |