A significant trend is detected, if | z c | > z crit where z crit is the value with probability α /2 on a standard normal distribution.
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A Landsat-based vegetation trend product of the Tibetan Plateau for the time-period 1990-2018.
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The sentences
However, such declining areas may not show at larger pixel sizes due to their relatively small spatial extent, particularly if the surrounding areas show a slightly increasing trend.