GTA Quebec prototype
GTA on organic potato
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Note:
The development of the agricultural indicators and the technological
choices inherent in its establishment as well as the physical
structure in terms of models building are presented here for
information only !
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Présentation:
The system is based on the concept of a Spatial Reference Information System
(Système d'Information à Références Spatiales
- S.I.R.S.). Within the framework of the installation of the local GIS GTA,
it will be a question of constituting two particular types of database management
system. The system by tables structure has priority in the establishment
because it will guide the development by handling the necessary geometrical
entities.
The emitted proposals that treat the indicators in a local mode and transmit
the data in a buffer zone in order to gather them seems a little bit difficult
for us to establish taking into account the desired quality of the analyses
and the different controls that it requires.
It is envisaged to make processings on the geometrical data by a method
of topological analysis which uses the selection technique that is impossible
if the data are gathered on the same system.
The data calibration and their topological and geometrical conformity are
priorities to ensure a high level of quality of the space analyses and we
cannot entrust this task to several distant systems without deteriorating
way criticizes the quality of the analyses.
Description of analysis
To know and to quantify the value of the indicator, it is necessary to allot
three to its significant characteristics:
Value (IQD) - > Quality of the Data Index (Index de Qualité
de Donnée)
Value (IQH) - > Quality of Assumption Index (Index de
Qualité
Value (IQA) - > Legal Quality Index
The program reviews each polygons and their attributes. A qualitative and
quantitative value is then generated in order to characterize each cultivable
plot of land.
For each agricultural plot of land a data base is attached in order to make
the analysis polygon by polygon. This information is read and interpreted
in order to allot the corresponding numerical value has its degree of tolerance
for the selected indicator.
In the following graph information of the pedological chart is included
which is attached to each unit or cultivable plot of land.
Once the data are structured according a precise order, the program generates a residual database used to regenerate a general classification.
Each time the program finds a polygon, it characterizes it by applying the following directives. If my polygon with the following descriptive characteristic it will obtain the following values:
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Classified ground is the content of pH according to the rule
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'Acid'
'Neutral'
'Alcaline'
'Dysique' |
val_ph = 1.0
val_ph = 0.5
val_ph = 0.2
val_ph = 0.0 |
Class of drainage quality
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Very badly drained
Badly drained
Moderately well drained
Well drained
Imperfectly drained
Rapidly drained
Very rapidly drained
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val_dr = 0.2
val_dr = 0.6
val_dr = 0.8
val_dr = 1.0
val_dr = 0.8
val_dr = 0.6
val_dr = 0.2
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Class of ground
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Organic
Loameuse-fine'
Argileuse-fine'
Loameuse-grossière'
Sableux'
Squelettique-sable'
Squelettique-loame'
| val_gr = 0.5
val_gr = 0.9
val_gr = 0.7
val_gr = 1.0
val_gr = 0.5
val_gr = 0.2
val_gr = 0.3
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Ground water
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Present during the period of dormance
Present during the periods of dormancy and active
Present at any moment
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val_nap = 1.0
val_nap = 0.8
val_nap = 0.1
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Soil humidity
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Humid'
Subhumid'
Perhumide'
Subarid'
Semi-arid'
Subaquatique'
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val_hum = 0.5
val_hum = 0.7
val_hum = 1.0
val_hum = 0.4
val_hum = 0.3
val_hum = 0.2
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Slope
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Between 0 – 5 %
Between 5 – 10 %
Between 10 – 15 %
Between 15 – + %
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val_pen = 0.5
val_pen = 1.0
val_pen = 0.7
val_pen = 0.0
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Crop proximity
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Non-bio potatoes less than 3 years
Maïze
Barley
Forage
Soya
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val_his = 0.1 sinon 1.0
val_his = 0.1
val_his = 0.4
val_his = 0.6
val_his = 1.0
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Once the treatment carried out, we obtain a series of values for each polygons with which we can regenerate a final classification to generate new zones which characterize the best places to cultivate bio potatoes. The piece colored in green represents the polygon in treatment, the zone colored in red is a selection of the close pieces to check the types of culture which are practised there, and weaves it white stripes indicates the transfer of information in the green polygon of color.
AREA = 0.00000
PERIMETER = 0.00000
CUL_PTX# = 1055
CUL_PTX-ID = 6
TYPE_CUL = valide
AN_CUL = 19XX
TYPE_CUL1 = CANOLA
AN_CUL1 = 1999
TYPE_CUL2 = CANOLA
AN_CUL2 = 2000
TYPE_CUL3 = FOIN
AN_CUL3 = 2001
TYPE_CUL4 = BLE
AN_CUL4 = 2002
TYPE_CUL5 = ORGE
AN_CUL5 = 2003
VAL_PH = 1.0000
VAL_DR = 0.8000
VAL_GR = 0.7000
VAL_NAP = 0.8000
VAL_HUM = 0.2000
VAL_PEN = 0.0000
VAL_HISTO = 0.0000
VQE = 0.0000
VQS = 0.0000
VQA = 0.0000
IQA = 0.0000
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© 2002-2003 GeoTraceAgri / IST Project 2001-34281
