Introduction

A polluted sites could be defined as a place where an accident occured such as an accidental leakage of a pollutant substance, as a storage site like a landfill or even as an exploitation area, used for metals construction or maintenance of building sites equipments. The notion of polluted site through this report will refer to this definition.   In the common architecture of a city, polluted sites are assumed to be mainly located in the periphery of the city, near suburbs location \cite{loire-atlantique}. Therefore people leaving closed to those areas are also located far from the center and all its services, including generalist practitioner. Based on this information, it might be interesting to further analyse the influence between those two parameters (polluted sites location, distance to closest generalist practitioner which will be abbreviate by DCGP through this report) and determine if this common architecture of the city is applied in the case of Vernier. 

Data

Various data were used to carry out this study : 

Methods

In order to interpret manipualte the previous list of data and extract some relevant results, the software QGIS 2.18.6 has been used. The first step for analysing the data has been to remove all the data that were beyond the borders of Vernier. This required some modifications of the Geneva canton original layer by removing all communes apart from Vernier. Then, the "Spatial Query" tool has been used in order to keep only polluted sites located within Vernier's borders. 
Now only Vernier's data are taken into consideration, both vector maps with polygons are transformed in vector maps with centroïds of polygons. This will be usefull in order to calculate distance between points of the two layers and see if point located far from generalist pratiotioner are closed to polluted sites. A distance matrix is therefore created in QGIS and will be further analyse in Geoda (a spatial data analysis, geovisualization, spatial autocorrelation and spatial modeling software). This distance matrix contains the distances from each point of the grid to the polluted sites as well as distance to the closest generalist practitioner. 

Results