This table shows the green cover is an item to evaluate the environmental model city, and the green coverage of constructed area should be greater than 30%. It's determining the percentage of total constructed area of the city, that main criteria for green coverage maps.

3-The Importance of Surveying And Mapping in Urban Plannning :
To study urban planning project within a city it needs a regular map to describe and present the city well as the map can be a basic tool for urban planning study, as we know there are many ways to create the maps such as traditional surveying and mapping, global positioning system (GPS) technology, photogrammetry aerial photographs (optical photo and Digital photo), and remote sensing (high- resolution images).

This study discusses about the extraction of urban green space from an IKONOS image and ERDAS software as remote sensing program, the methodology is basically concerned with the object spectral features, in test area of image the spectral characteristic of different features in all 4 bands and analyzed.

Provided the biophysical characteristic of the study area, a method to create the vegetation map is based on two kinds of image:

1. Normalized difference vegetation index (NDVI) {(IR-R)/(IR+R)} which means
   {(band4-band3) / (band4+band3)}.
2. Near-infrared at red reflectance (IR/R) that's mean {(band4/band3)}.

Study Area :
The study case is located in Nanjing city (32.03N, 118.47 E) at JIANG SU province in China.
And in this research there are two methods will used to extract the green space maps.



1- The first method employed texture algorithm was ran on five images at Nanjing city in (NDVI >0.08) that can shows the vegetation map for the test area this method adopted after making attribute for (NDVI)and the following images show parts of green space are extracted from NDVI attribute.


The next images extracted from (NDVI >0.08) for five areas and it called in this study (A) method and the raster attribute edit shows the pixels number of green space at method (A)

Area 1

Area 2