MethodologyThe methodology
adopted in the present study to carry out the details of the land use / land
cover mapping is given in the flow chart. However, the understanding of
classification, interpretation, delineation, fieldwork, final mapping and area
tabulation to facilitate this study is carried out in the following stages,
which are as follows:
Pre - Field Work
- Literature Review.
- Land use / Land cover Classification .
- Designing land use/land cover classification scheme based on the available
data source.
- Defining the different land use / land cover classes.
- Base map formation.
- Preparation of base map on 1: 25,000 scale, all the natural and manmade
features like roads, drainage and landmarks were incorporated on the base map
for easy transfer of details from interpreted overlays.
- Interpretation.
- Setting the minimum delineation unit (5 mm x 5mm)for classifying the
different land use/ land cover.
- Visual interpretation of the Remote sensing data by using the usual clues
such as shape, size, pattern, texture, tone and associated features as well as
local knowledge.
- Transfer of interpreted information onto the base map.
- A grid of 1cmx1cm or (250 Mts. X 250 Mts.) was drawn on the interpreted map
for marking sample points.
- Marking of the doubtful cases on the map for field checking in order to
ascertain It's actual use.
- Interpretation results of two database (1993 and 1996) are recorded in the
digital form by doing scanning. These scanned maps are digitised by doing on
screen digitisation to form a digital data base for computer based analysis,
which will serve the base for all the information regarding the land use/ land
covers statistics and as well as land use / land cover change analysis.
Field Work
- Reconnaissance survey to get a general idea of the area features environment
and accessibility.
- Checking of sample points .
- Checking of unresolved cases. After checking the polygons they were assigned
in appropriate classification code.
Post Field Work
- Finalisation of land use map is done after incorporating necessary
corrections and modifications after field check.
- Scanning/ digitisation of maps which are updated during the field survey.
- Area calculation.
- Land use / land cover change analysis.
- Preparation of Final maps Tables and Charts.
- Report Writing and Submission.
Data Base Formation and Land Use
Change Analysis Land use Analysis Since 1993 a considerable
change had taken place on the land use of Enschede City and its environs. From
1996 IRS image it was possible to delineate the major land use. The
interpretation was cross-checked with the aerial rectified photographs of year
1996. Regarding the land use for the year 1998, it was only updated by doing the
field survey. During survey main emphasis was given to the construction sites.
Table 4.1 indicates the total areas of different land uses for the three
consecutive years calculated from the data input.
Area in Hectares of Different
Land Uses 1993, 1996 and 1998
| Landuse classes |
1993 |
% |
1996 |
% |
1998 |
% |
| Residential |
220.1 |
19.50 |
257.2 |
22.80 |
267.7 |
23.73 |
| Commercial |
21.5 |
1.90 |
21.5 |
1.90 |
21.5 |
1.90 |
| Industrial |
39.1 |
3.46 |
48.8 |
4.32 |
48.8 |
4.32 |
| Water bodies |
8.3 |
0.73 |
8.3 |
0.73 |
8.3 |
0.73 |
| Cropland |
202.9 |
17.98 |
107.3 |
9.51 |
107.3 |
9.51 |
| Grassland |
401.2 |
35.56 |
445.1 |
39.44 |
442.3 |
39.21 |
| Forest |
68.9 |
6.11 |
62.7 |
5.55 |
62.7 |
5.55 |
| Wood |
104.4 |
9.28 |
101.6 |
9.04 |
100.3 |
8.88 |
| Cemetery |
23.0 |
2.04 |
23.0 |
2.04 |
23.0 |
2.04 |
| Sport fields |
29.7 |
2.68 |
33.1 |
2.98 |
33.1 |
2.98 |
| Construction site |
0.0 |
0.0 |
10.5 |
0.93 |
4.1 |
0.39 |
| Country boundary |
0.2 |
0.02 |
0.2 |
0.02 |
0.2 |
0.02 |
| Major road |
0.7 |
0.06 |
0.7 |
0.06 |
0.7 |
0.06 |
| Minor road |
2.7 |
0.24 |
2.7 |
0.24 |
2.7 |
0.24 |
| Stream & canals |
0.3 |
0.02 |
0.3 |
0.02 |
0.3 |
0.02 |
| Railway |
0.4 |
0.03 |
0.4 |
0.03 |
0.4 |
0.03 |
| Institutional |
4.4 |
0.39 |
4.4 |
0.39 |
4.4 |
0.39 |
| Total |
1127.8 |
100 |
1127.8 |
100 |
1127.8 |
100
|