Integration of Geographic Information System and Area Production
Model (Apm) In the Prediction of Forest Degradation
at Phrao District, Thai Land
Yousi ali Hussin Vicente Ato Alfred De Gier
The International Institute £or Aerospace Survey
and Earth Sciences (ITC) 7500 AA Enschede, The Netherlands
Fax: (31) (53)874-399
E-mail: [email protected], [email protected]
Recent decades have brought profound changes in the patter of land use in
many developing countries. One of the clearest indicator of this changing to
the land use pattern is the dramatic decline of natural forest cover, especially
in the tropics. The increasingly rapid destruction of tropical rainforests is
now at the center of world attention, prompting professional foresters and
politicians alike to find ways to control, stop, and even reverse this process.
Given the speed of the process, two issues are clear: actions are needed without
undue delay, and a sustainable effect of such actions can be expected only if
the causes are tackled. The problem thus needs to be examined from a cause-
effect point of view.
The objective of this research was to explore the possibility of linking the
results of remotely sensed data classification with numerical output of the area
production model in a GIS environment in order to validate and predict forest
degradation in Phrao district, Chiang Mai province, Thailand.
A major cause of forest destruction is the need for more agricultural
land, which in turn is a consequence of rapid population growth. The need for
, timber, fuel wood and cash also influence deforestation. Recognizing the
important role natural .resources in their national development, , governments
in many develop1ng countr1es have shown great concern to save their remaining
forest. Solutions are urgently needed. Controlling the continued degradation
of the tropical forest can only be successful when detailed knowledge is
obtained about the expected trend of degradation. There is a need for effective
monitoring of these changes in time so that effective measures can be taken to
counteract the ,situation. Timely and appropriate information in this required
to prov1de decision makers and forest managers as basis for action in order to
abate the current deterioration of the forest. Remote sensing and GIS can help
government planners and policy makers to decide on what step they can adopt
wh1ch w111 best stop the degradat1on and meet the demand of the populat1on for
food and fiber. Prediction model can effectively provide bases for possible
future scenarios about the status of forest.
Aside from unsustainable logging, the main cause of the contraction of
most tropical forest lands in the world is the gradual expansion of agricultural
r frontier into areas which were formerly reserved or classified as forest..’
(Cernea, 1993) .Among others, expansion of agricultural lands is driven by the
increasing population and the socio-economic policy of a nation.
While population growth is but one of the many factors, it is , exceptionally significant factor. The rapid increase of human number imposes r unsustainable burden to the forest resource base in two ways; there is a growing r demand for forest products (i.e. timber, fuel wood, etc.), and the need to feed a larger population will increase the pressure to clear forest areas and convert
” them to crop farming. Moreover, the scarcity of land in the lowlands triggers I marginalized farmers to migrate to the uplands, bringing with them their lowland t’ farming technology that may aggravate to the destruction of the forest. r Expansion of farmland has been the primary means through which agricultural
production has been increased to meet both the subsistence needs of a growing
population and the demand of domestic and agricultural commodity export markets. The increasing area of farmland per capita of agricultural population however, reflects increasing farm area allocated to upland field crops, three crops, other agriculture related activities, and farmland allocated for grazing or fallow and non-agriculture uses.
Likewise, most analysts agree that it is the factor associated with the economic development of the country that has been the most important driving force underlying the land coversion process. These force have contributed to both depletion and displacement of forest resources. Government policies in many developing countries are biased towards production rather than conservation. As a result, natural resources are over exploited in favour of the much needed foreign exchange. Moreover, the construction of role in opening remote forest areas. once access is available, a cascade of events towards forest destruction is inevitable.
Recognizing the import role of natural for national development, governments in many developing countries have shown great concern to save their remaining forest. Solutions are urgently needed. Mitigation of the continued degradation of the tropical forest can only be successful when detailed knowledge is obtained about the expected trend of degradation. There is a need for effective monitoring of these changes in time so that effective measures could be taken to counteract the situation. Timely and appropriate information is thus required to provide makers and forest managers as basis for action in order to abate the current deterioration of the forest. these information also help government planners and policy makers what step to adopt that will best meet the demand of the populations and balance the need to protect the environment. simulation models can effectively provide bases for possible future scenarios about the status of the forest. These help decision makers at the policy level and enable them to examine possible alternatives through identifying consequences of various strategies under given conditions (Shimada, 1986). Information about forest area changes is necessary to monitor effective forest management.
The use of remotely sensed data and geographic information system (GIS) are now gaining more and more importance as tools in natural resource management. Satellite observations about proximate sources of land cover change. Under GIS, data obtained from satellite observation can be easily integrated and analysis is facilitated. Information produce from GIS can be stored and retrieve easily in forms that are more useful and understandable by the users like policy and decision maker or project implementers.
The development of the Area production Model (APM) has been an important step in predicting land use changes. he APM is intended for simulation of long-term land use changes and the prediction of primary and secondary yields from agricultural and forest lands. Among other things, the model simulates the future need for agricultural products and land are generated primarily by the growth rates of population and GDP, and by changes in land productivity. The model is comprehen-sive, but does not have excessive data requirements.
De Gier and Hussin (1993), Hussin et al., (1994) and De Gier et al. (1995), have resolved the model spatially, automatically operate the model in ILWIS GIS and apply it to an area in East Java, Indonesia. This implementation include land transfer part of the model.
The objective of this research was to explore the possibility of linking the results of remotely sensed data classification with numerical output of the area production model in a GIS environment in order to predict forest degradation in phrao district, Chiang Mai province, Thailand.