Service Description: Lake Poyang is shrinking and causes devastating changes. People who depend on Lake Poyang are alarmed because the shrinking lake impacts land coverage and the economy.
In order to dispay the changes in Lake Poyang, I compared satellite images between 1984 and 2014. I used the iso cluster unsupervised classification tool to classify the 1984, 2001, and 2014 satellite images into 4 classes to highlight the lake.
After classifying each satellite image, I used the majority filter tool to clean up the small isolated pixels that were classified as water but are not part of Lake Poyang for all three classified layers.
I then cleaned up the boundaries between each classification for every year layer using the boundary clean tool. This produced clear images of the three layers, allowing the user to clearly see how much Lake Poyang has shrunk from 1984 to 2014.
To further highlight the shrinkage with data, I calculated Lake Poyang's area over time. I did this by adding a Hectares field to both the 2014 and 1984 lake coverage attribute tables. I then calculated the hectares using the following equation : Hectares=(!Count!*900)/10000. After calculating the lake hectares for 1984 and 2014, there was approximately 70,000 hectares of Lake Poyang that were lost in those 30 years, which averaged to about 2,300 hectares a year.
This is devastating and further highlights the issue of this shrinking lake. I would recommend that further studies be done to determine why this is happening and how they can put a stop to it.
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