FORM FIVE SELECTIONS 2021** FORM 5 JOINING INSTRUCTIONS
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Geomorphological
mapping procedures
Procedures followed from the beginning to the end as
per Cooke and Doornkamp, 1990) are:
1) Familiarize with what is required based on the
intention of that mapping.
2) Desk study: collection of background data including
maps, photos, relevant data, etc. (Sometimes called literature survey)
3) Preliminary planning of field programme and mapping
procedures
4) Reconnaissance field visit (if necessary)
5) Finalize mapping procedure and programme including
preparation of base map
6) Actual field mapping including extrapolation of
areas not visited, samples collection, and field-testing where necessary.
7) Laboratory analysis of samples
8) Cartographic work including preparation of
derivative maps.
9) Report compilation
10) Presentation of the result (map).
Sources of
data for mapping:
1) Physical field mapping
2) Remote sensing sources: ranging from aerial
photography to satellite imagery.
In principal, both techniques are employed in gathering essential data
during mapping.
Advantages
of remote sensing:
1) Applicable even in area not accessible in the field.
2) Used as base line in comparing past records with
present condition
3) A synoptic view: View from above give a better interpretation
of some features than can be seen on the ground, such as pattern of sand dunes,
braided river pattern faults, etc.
4) Give a larger coverage in single space imagery. For
example LANDSAT MSS image cover an area of 185x185km.
5) Can suppress small details and allow dominant forms
and patterns to be displayed.
6) Special sensors can be give information even in area
with thick vegetation and cloud. Hence supplement what can be obtained from
field mapping or aerial photography
Applications
of Geomorphological mapping
1) Provide a precise picture of the dynamics of relief
that will, in turn:
- Enable the reconstruction of the development of
relief
- Provide the way to evaluate factors and
processes of origin and transformation
2. Facilitate the search for connections between
landforms
3. Facilitate the development of comparative studies
4. Provide a means of comparison between developed and
developing landforms in areas of differing and of similar geologic structure
and under varying climatic conditions
5. Serve as an aid in studying the role of climate in
shaping the earth's surface by distinguishing climatic types of relief
6. Applied in searching of natural resources related with
geomorphology such as secondary minerals and natural aggregates.
7. Applied in zoning and assessing natural hazards such
as landslides, floods earthquakes, volcanoes etc.
8. Applied in geotechnical studies such as selection of
better routes for road in mountainous areas, site for dams, planning settlement
and site for creation of new dumps for disposal of waste products
9. Applied in forest ecological research and landscape
management in high relief environment.
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