Calculating First and Last Disturbance from UMD Dataset using Google Earth Engine

The GLAD UMD dataset on the TCC can be found here. The first disturbances are the first year in the time series for which the TCC drop to zero (or your country threshold) and the last disturbances signifies the last year of change.

With the help of the Earth Engine, we will try to generate the first and last disturbances information. The logic is presented as pseudocode below.

for (i=1; i<years; i++) {
    if (out[y][x]==0 and (loss[i][y][x]>0 or (tcc[i][y][x]==0 and tcc[i-1][y][x]>=10))){
        out[y][x]=i;
    }
}

The source code for the first disturbance is here and last disturbance can be found here.

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One thought on “Calculating First and Last Disturbance from UMD Dataset using Google Earth Engine

  1. Pingback: Calculating First and Last Disturbance from UMD Dataset using Google Earth Engine – Open Geo Blog

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