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Delineation and incorporation of socio-infrastructure database into GIS for land use planning: A case study of Tan Phu Thanh village, ChauThanh District, Cantho Province
3. Methodology
Various types of originally collected and derived data were used in the study. The basic data sources were (a) Soil map, (b) Hydrological map, (c) infrastructure Accessibility maps, (d) socio-economic data gathered through field survey, and (e) other published and unpublished information, such as agricultural statistics, and soil reports.
The evaluation and criteria develoment in the study area have been divided into two ways : physical land evaluation and socio-infrastructure land evaluation, in which:
- Physical land evaluation used the limiting factor method for assigning the suitabality classes, in which the lowest suitability class will limit for the rest of factor, and the overall suitability class will be the lowest suitability class. This methodology applied for evaluation the physical suitability of the study area.
- Socio-Infrastructure evaluation used the criteria and weight for different important rates of each factor, the multiplication process of all factor and reclassification for different suitability classes used as the same method suggested by FAO (1986)
3.1. Promising land use types (LUTs) in the study area
According to the current agricultural conditions, and the results of the present LUTs analysis above, there are four main development targets which can be reflected in the present land use systems: (i) increasing crop production per ha; (ii) increasing income of farmers; (iii) increasing areas of intercropping of fruit garden and aquaculture; and (iv) trials of land use system model.
Based on the those reasons and objectives, six promising land use types were selected for study on land suitability classification in Tan Phu Thanh, that is:
- LUT1 : Double cropping of rice: WS rice - SA rice + Fish
- LUT2 : Triple cropping of rice: WS rice - SA rice - AW rice + Fish
- LUT3 : WS rice - SS upland crops - AW rice + Fish
- LUT4 : WS Upland crops - SS upland crops - AW rice + Fish
- LUT5 : Intensive vegetable
- LUT6 : Fruit trees + Fish
(WS: Winter-Spring; SS: Spring-Summer; SA: Summer-Autumn; AW: Autumn-Winter)
3.2. Physical land suitability classification method
Land mapping unit of the study area has been created based on the physical conditions of the study area. Various types of originally collected and derived data were used in the study. All maps at the scale of 1/5000. The basic data sources were
- Soil map (soil types, topsoil thickness, depth of sulfuric, pyritic occurrence)
- Administrative boundary maps
- Hydrological map (inundation)
The diagostic factor and factor rating for different land use types is showed in Table 1.
Table 1 : Diagnostic factors and factor rating of physical conditions for different land use types in the Tan Phu Thanh village.
| Factor rating | Suitability Classes |
| S1 | S2 | S3 | N |
| Lut 1: Rice (DX) + Rice (HT) – Fish |
| Top soil thickness (cm) |
>20 |
< 20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>80 |
50-80 |
<50 |
- |
| Lut 2: Rice (DX) + Rice (HT) + Rice (TD) – Fish |
| Top soil thickness (cm) |
>20 |
<20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>80 |
50-80 |
<50 |
- |
| Depth of flooding (cm) |
<60 |
60-80 |
>80 |
- |
| Lut 3: Rice (DX) + Upland crops (XH) + Rice (TD) – Fish |
| Top soil thickness (cm) |
>20 |
<20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>120 |
80-120 |
50-80 |
<50 |
| Depth of flooding (cm) |
<60 |
60-80 |
>80 |
- |
| Lut 4: Upland crop (DX) + Upland (XH) + Rice (TD) – Fish |
| Top soil thickness (cm) |
>20 |
<20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>120 |
80-120 |
50-80 |
<50 |
| Depth of flooding (cm) |
<60 |
60-80 |
>80 |
- |
| Lut 5: Upland crops |
| Top soil thickness (cm) |
>20 |
<20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>120 |
80-120 |
50-80 |
<50 |
| Depth of flooding (cm) |
<40 |
40-60 |
60-80 |
>80 |
| Lut 6: Fruit tree- Fish |
| Top soil thickness (cm) |
>20 |
<20 |
- |
- |
| Occurrence of sulfidic horizon (cm) |
>120 |
80-120 |
50-80 |
<50 |
| Depth of flooding (cm) |
<40 |
40-60 |
60-80 |
>80 |
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