Methods of Water Quality Assessment in Geoinformation Systems Technology

Various water quality assessing methods are analyzed. The method of comparison with the pollutants maximum permissible concentration, the water pollution index, the specific combinatorial water pollution index and the complex indicator χ are considered. Based on these methods, algorithms were developed and water quality assessments script-tools were implemented. To compare the results, all assessments were reduced to a single scale. The scripts were implemented using Python with the ability to save, accumulate and present data in the ArcGIS for Desktop environment, which make it possible to create a set of tools using the ArcPy package. The tools were tested on water quality monitoring data organized by the Office of Rospotrebnadzor in the Leningrad Oblast from 2008 to 2020. Based on the testing, the results of the tools were compared with identifying the advantages and disadvantages of the considered water quality assessment methods. The developed tools can be used for general and local analysis of water quality in different regions, taking into account or not the combined summation effect of harmful substances in water.