There are also variations in the size of water-covered areas between the seasons. Since image classification involved combining multiple satellite images taken during different seasons, this may have led to slight variances in forest cover, mostly in verge areas where shrubland can be mistaken for mixed forest and vice versa at this resolution. Where these ambiguities were present on a map, the mappers analyzed later maps to mitigate the risk of incorrect classification. Marks and lines: There were instances of small lines appearing on maps – in 1989 over Western Cambodia, and two in 2009 over Mondulkiri. These lines resulted in negligible information gaps and have been removed in the latest 2014 maps. The presence of these data gaps in those two years does not detract from the overall forest cover trend revealed from 1973 to 2014. Ground truthing: Since these maps apply to the entire country, ground truthing was not feasible.
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