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Suitable living condition within cities

The fifth area is farming and agriculture land

2- The second method is depending upon Near-infrared at red reflectance (IR/R) and the algorithm for this method was:

The last mathematical model was founded and used to extract the green space, and the next images show the green areas that extracted by two methods (A) and (B) from second area that located at the center of Nanjing city.

In the (B) method we have seen green information of test area then parts of non-green space appeared and it need to be eliminate, but when we making model to comber the two methods as difference between (B) and (A) {(B)-(A)}, we have founded that many pixels are belong to green space and few of them belong to non-green space and the following images show the difference.

The next images have shown non-green space:

The result:
After the two extraction methods used, we obtain two kinds of maps describing the green space at five areas in Nanjing one of them is an agriculture land, the following tables and charts give the idea about the percentage of the green space for each area, finally it tells about the green space area from the total test area.

 green space by pixel and there ratio from the area 1 Green space Remaining total area Ratio Green space difference1 Images difference2 A 629584 3087272 3716856 0.169386169 75088 85196 B 704672 3012184 3716856 0.18958819 2 green space Remaining total area Ratio Green space difference1 difference2 A 105750 2363850 2469600 0.0428207 7425 13725 B 113175 2356425 2469600 0.045827259 3 green space Remaining total area percentage ratio Green space difference1 difference2 A 94214 3081607 3175821 0.02966603 13872 18207 B 108086 3067735 3175821 0.034034034 4 green space Remaining total area Ratio Green space difference1 difference2 A 168000 3914400 4082400 0.041152263 22800 29600 B 190800 3891600 4082400 0.046737213 5 green space Remaining total area Ratio Green space difference1 difference2 A 4096597 12883184 16979781 0.241263241 272322 541282 B 4368919 12610862 16979781 0.257301257

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