The main purpose of this thesis is to create helpful tools in program ArcGIS, that allow creating a triangular point graph based on input geographical data. Triangular graph can be used for phenomenon, which contains three variable structures. This triangular graph is used to classify input data.
For solving this task was used programming language Python and software named ArcGIS. Python language allows iterating through input data, reading, writing and creating new data. It’s really easy to use and learn. There is one essential module named ArcPy, that contains functions, classes and other stuff for using Python in software ArcGIS. Two scripts were created for handling the data classification.
First python script first of all reads user input data and calculates percentage value of three variable structures. After that transforms percentage values to X, Y coordinates. These coordinates will be used as plotting coordinates in file Shapefile. Of course there is some check algorithms that filters out and inform about invalid input data. This first script also generates base triangle and lines that indicates average percentage values for further usage.
Between using first and second script, user must chose or create a polygon layer that contains zones of category in triangular.
The second script compares plotted points from first script and zones that the user had to create on its own. The result of this comparison is new attribute in input data that allows create a map based on type of new data.
To test new created scripts two maps was created. They are related to demography and one map shows types of Czech districts based on averages of basic age types. The second map contains region of Olomouc and shows types of districts-like areas based on amount of people that works in three types of economy.
The scripts will be available on web pages of Department of Geoinformatics, Palacký University Olomouc as well as text of thesis and maps.