SPIS Toolbox - Topography - Revision history

Ranisha at 13:43, 4 September 2018

2018-09-04T13:43:16Z

Ranisha at 13:29, 4 September 2018

2018-09-04T13:29:53Z

Ranisha at 11:28, 4 September 2018

2018-09-04T11:28:34Z

Ranisha at 11:28, 4 September 2018

2018-09-04T11:28:04Z

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2018-09-04T11:27:41Z

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| style="width: 150px; background-color: rgb(222, 226, 192);" | '''[[SPIS_Toolbox_-_Evaluate_the_Business_Environment|►Go to the Next Chapter]]'''
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=== '''Topography''' ===
[[File:The effect of aspect.png|thumb|right|180px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]] 
Topography describes the elevation and the relief features on the earth’s surface. Relief features include both natural and man-made landforms such as roads, hills, valleys, railways among others. Key topographical features in evaluating market potential for SPIS are slope and aspect.

Slope is a measure of the change of elevation over a certain distance. It answers the question of how steep an area is and is a determining factor for the type of irrigation system to promote. This in turn determines the cost and labour requirement (e.g. erosion control practice and water conveyance channels). For instance, surface irrigation is more suitable in undulating areas and is cheaper compared to sprinkler and drip irrigation which are more suited on steeper or unevenly sloping land. Therefore, coupling steep lands with a factor like low access to finance (discussed in Chapter 3) would lead to weak market potential for SPIS.

Aspect describes the direction which a slope faces. It is especially relevant for systems located in higher latitudes and rarely affects systems close to or along the equator. Aspect influences the amount of solar radiation that the slope receives as well as the daily range of temperature and the relative humidity on the slope.

Generally, more direct sunlight tends to fall on the south and southwest slopes while North aspects of slopes are more shaded in the northern hemisphere. The converse is true in the southern hemisphere where more direct sunlight tends to fall on the north and northwest slopes. 

Topographic analysis for potential SPIS sites can be determined through use of topographic maps that depict the physical configuration of the earth’s surface using contour lines as wells as symbols for man-made and natural features. Users can also use Digital Elevation Models (DEMs) that are specialized databases that represent the relief of a surface between points of known elevation. DEMs can be used on Geographical Information System (GIS) platforms. This should be followed by a ground-truthing exercise to determine the exact slope and aspect of the area of interest.

==== '''Outcome/Product''' ====

Determination of slope and aspect of potential SPIS markets 
Selection of suitable irrigation systems based on the topography of the potential SPIS market

==== '''Data Requirement''' ====

Topographic Maps 
Digital Elevation Models(DEMs)

==== '''People/Stakeholder''' ====

Lands and Survey Authorities

==== '''Important Issues''' ====
Care must be taken when designing irrigation systems on steep slopes as such areas are prone to erosion and runoff.
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-=== '''<span style="color:#879637;">Topography</span>''' ===
+=== '''<span style="color:#879637;">2.4 Topography</span>''' ===
 [[File:The effect of aspect.png|thumb|right|250px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]] Topography describes the elevation and the relief features on the earth’s surface. Relief features include both natural and man-made landforms such as roads, hills, valleys, railways among others. Key topographical features in evaluating market potential for SPIS are slope and aspect.

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-| style="width: 150px; background-color: rgb(222, 226, 192);" | <span style="color: rgb(0, 0, 0);"><span style="font-size: 90%;">'''[[SPIS_Toolbox_-_Evaluate_the_Business_Environment|►Go to the Next Chapter]]'''</span></span>
+| style="width: 150px; background-color: rgb(222, 226, 192);" | <span style="color: rgb(0, 0, 0);"><span style="font-size: 90%;">'''[[SPIS Toolbox - Crops and Livestock|►Go to the Next Chapter]]'''</span></span>
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 === '''<span style="color:#879637;">Topography</span>''' ===
-Slope is a measure of the change of elevation over a certain distance. It answers the question of how steep an area is and is a determining factor for the type of irrigation system to promote. This in turn determines the cost and labour requirement (e.g. erosion control practice and water conveyance channels). For instance, surface irrigation is more suitable in undulating areas and is cheaper compared to sprinkler and drip irrigation which are more suited on steeper or unevenly sloping land. Therefore, coupling steep lands with a factor like low access to finance (discussed in Chapter 3) would lead to weak market potential for SPIS.
+[[File:The effect of aspect.png|thumb|right|250px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]] Topography describes the elevation and the relief features on the earth’s surface. Relief features include both natural and man-made landforms such as roads, hills, valleys, railways among others. Key topographical features in evaluating market potential for SPIS are slope and aspect.
-Aspect describes the direction which a slope faces. It is especially relevant for systems located in higher latitudes and rarely affects systems close to or along the equator. Aspect influences the amount of solar radiation that the slope receives as well as the daily range of temperature and the relative humidity on the slope.
+<u>'''Slope'''</u> is a measure of the change of elevation over a certain distance. It answers the question of how steep an area is and is a determining factor for the type of irrigation system to promote. This in turn determines the cost and labour requirement (e.g. erosion control practice and water conveyance channels). For instance, surface irrigation is more suitable in undulating areas and is cheaper compared to sprinkler and drip irrigation which are more suited on steeper or unevenly sloping land. Therefore, coupling steep lands with a factor like low access to finance (discussed in Chapter 3) would lead to weak market potential for SPIS.
 Generally, more direct sunlight tends to fall on the south and southwest slopes while North aspects of slopes are more shaded in the northern hemisphere. The converse is true in the southern hemisphere where more direct sunlight tends to fall on the north and northwest slopes.<br/>
@@ Line 24: / Line 26: @@
 *Determination of slope and aspect of potential SPIS markets<br/>
 *Selection of suitable irrigation systems based on the topography of the potential SPIS market
 ==== '''<span style="color:#879637;">Data Requirement</span>''' ====
@@ Line 29: / Line 33: @@
 *Topographic Maps<br/>
 *Digital Elevation Models(DEMs)
 ==== '''<span style="color:#879637;">People/Stakeholder</span>''' ====
 *Lands and Survey Authorities
 ==== '''<span style="color:#879637;">Important Issues</span>''' ====
 *Care must be taken when designing irrigation systems on steep slopes as such areas are prone to erosion and runoff.
 {{SPIS Reference}}

@@ Line 8: / Line 8: @@
 | style="width: 150px; background-color: rgb(222, 226, 192);" | <span style="color: rgb(0, 0, 0);"><span style="font-size: 90%;">'''[[SPIS_Toolbox_-_Evaluate_the_Business_Environment|►Go to the Next Chapter]]'''</span></span>
 |}
 === '''<span style="color:#879637;">Topography</span>''' ===
-[[File:The effect of aspect.png|thumb|right|250px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]]<br/>
+[[File:The effect of aspect.png|thumb|right|250px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]]
 Topography describes the elevation and the relief features on the earth’s surface. Relief features include both natural and man-made landforms such as roads, hills, valleys, railways among others. Key topographical features in evaluating market potential for SPIS are slope and aspect.

@@ Line 10: / Line 10: @@
 === '''<span style="color:#879637;">Topography</span>''' ===
-[[File:The effect of aspect.png|thumb|right|180px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]]<br/>
+[[File:The effect of aspect.png|thumb|right|250px|The effect of aspect (Source: http://www.explorenaturalcommunities.org)]]<br/>
 Topography describes the elevation and the relief features on the earth’s surface. Relief features include both natural and man-made landforms such as roads, hills, valleys, railways among others. Key topographical features in evaluating market potential for SPIS are slope and aspect.