4.2 Thematic layers for the GIS
Tables 4.1, 4.2 and 4.3 show the various data that have been
entered into the database to constitute the thematic layers for the GIS. The
various layers have different uses in the database such as the geographical
location of the various soil types, equipments on the irrigation system,
creation of water requirement maps, digital elevation maps, and determination
of ETc etc.
Table 4.1: Thematic layers for simulation of the
functioning of the network
Thematic layer of
GIS
|
Mode of
representation
|
Principal objectives
|
Data
source
|
Hydrants
|
Vector (polyline)
|
Visualize in a georeferenced
space the various hydrants
|
Irrigation
Service
|
Irrigation
|
|
Visualize in a georeferenced
|
|
Network
|
Vector (polyline)
|
space the various equipments
of the water supply system
|
Irrigation
Service
|
|
|
Visualize access for
|
|
Road network
|
Vector
|
maintenance works on the
|
DST
|
|
(polyline))
|
Irrigation system
|
|
Contour lines
|
Vector
|
Create a DEM to determine
the altitude at each point in
|
|
|
(polyline)
|
the plantation
|
DST
|
Equipments on
|
Vector
|
Visualize in a georeferenced
|
Irrigation
|
Irrigation
System
|
(polyline)
|
space all equipments on the
primary, secondary
and
tertiary network
|
Service
|
|
shp=shape file, dbf=database format, DEM=Digital elevation
model, GN=Grand Nain cultivar, W=William cultivar
Table 4.2: Thematic layers needed for water balance
calculations
Thematic
layer of the
GIS
|
Mode of representation
|
Principal objective(s)
|
Data source
|
Zonal
boundaries of
|
|
|
|
PHP Sud
|
Vector (polygon)
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
Geographically locate
all objects present in this limit
|
.dbf File
|
Boundaries
php1-2-3-4-5
|
Vector (polygon)
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
|
.dbf File
|
Sector
boundaries
|
Vector (polygon)
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
|
.dbf File
|
Production
plot
boundaries
|
Vector (polygon)
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
|
.dbf File
|
Boundary of
spatial
occupation,
GN cultivar
|
Vector (polygon)
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
|
.dbf File
|
Boundary of
spatial
occupation, W
cultivar
|
Vector (polygon))
|
Create a DEM
|
.shp File
|
|
|
|
Associated to a
|
|
|
|
.dbf File
|
Soil types
|
Vector (polygon)
|
Create a DEM et
|
Soil map from the
|
|
|
Visualise in a
|
Direction
|
|
|
Georeferenced space the
|
Agrononiques?
et de la Recherche
|
|
|
Various soil types in the plantation
|
(DAR)
|
Meteorological
|
|
|
|
Stations
|
Vector (polygon)
|
Visualise in a
|
|
|
|
Georeferenced space the various
stations
|
DAR
|
|
|
Create ETP, climatic data, and water
requirement maps
|
|
Rainguages
|
Vector (polygon)
|
Visualise in a
|
|
|
|
Georeferenced space the
location of the rainguages
|
DAR
|
Crop
developmental
|
|
Create a DEM of the production plots
|
Direction de
|
stages
|
Vector (polygon
|
concerned
|
Production (DP)
|
|
Table 4.3: Thematic layers for non-descriptive
data
Non Spatial Principal Data
data Characteristics Manipulation Simulation
objective(s) source
Crop Variety
Developmental stage Modelling
Crop coefficient Crop water Irrigation Topological DP
Height above the ground Requirements scheduling Description
Max rooting depth Statistical analysis
Min rooting depth Simulation
Depletion level
Yield factor
Planting date
Soil Field capacity
Wilting point Determination of
TAWC the soil type
RAW Available Water Irrigation Calculate soil DAR
Infiltration rate Content scheduling moisture deficit
Calculate soil
% Clay moisture
% Sand Content
% Silt
Maximum rooting depth
Climate Temperature
Rainfall ETp Irrigation
Relative humidity ETc scheduling
|
Calculate crop
water
requirements and
water DAR
|
|
Wind speed loss by the plants
Sunshine hours
Effective Precipitation
Production Surface area Calculate quantity
Plot Agronomic state of water consumed
Crop variety Quantity of Irrigation Modeling DP
Planting date Water required scheduling
Spatial arrangement on the plot
Soil type
|
Water-plant-
atmosphere
Determination of
the
terms
of the water
balance equation
|
|
Water deficit Calculate irrigation
Slope Efficiency
Irrigation system
| 
