Table 1 summarizes some of the key forest statistics from Vietnam. Between 19, forest area in Vietnam increased annually by 1.1% to 2.3%, although it has been noted that some provinces have experienced overall losses in forest cover over this same time period. Of the current forests in Vietnam, only 1% is considered to be primary forest (i.e., no clear visible indications of previous human activities or disturbance), whereas about 74% is natural secondary forest and about 25% is plantation forest.
The Vietnam Forest Administration estimates forest cover to be slightly lower (40% cover). According to the Food and Agriculture Organization, approximately 42% of Vietnam’s total land area was forested in 2010. One of the challenges facing Vietnam, as well as other countries in the region, is to develop and enact land use and forest management policies that conserve natural forest ecosystems, while at the same time help to sustain wood and food production. With a population of approximately 90.7 million and a population density of 293 people per square km, Vietnam is one of the most densely populated countries in Southeast Asia. Spectral changes within these regions have not occurred at the same levels as those areas adjacent to the reserves. One important observation is that the most highly protected national reserves in the region have not changed much over the entire Landsat timeframe (1972–present). Recent changes are most marked along the relatively narrow interfaces between agricultural and forest areas that occur towards the boundaries of the province. In general, our analyses indicated that many land-use changes have occurred throughout Lam Dong Province, including gradual forest to non-forest transitions. High-resolution Google Earth imagery and Landsat data of the region were used to validate results. We conducted a field trip through Lam Dong Province to develop a better understanding of the ground conditions of the region, during which we obtained many photographs of representative forest sites with Global Positioning System locations to assist us in our image interpretations. Our analyses concentrated on the timeframe of 1973–2014, with much emphasis on the latter part of that range.
#Time sink define series
We conducted three types of image change analyses using Landsat time series data to characterize the land cover changes.
Landsat time series data were used to characterize forest degradation in Lam Dong Province, Vietnam.
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