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CityGML-CityJSON

Practice of citygml-tools and cjio.

  • Convert the CityGML file into CityJSON with citygml-tools.
  • Validate the CityJSON file with cjio command line. Upgrade the file and validate it.
  • Python practice to retrieve data of buildings from the CityJSON file.

Project: Building Height Analysis from CityJSON Data

Overview

This project provides a Python script to analyze building height data from a CityJSON file. It generates a distribution of buildings based on their heights and visualizes the data in a pie chart. The script performs the following tasks:

  • Loads a CityJSON file containing city object data.
  • Extracts building height information.
  • Categorizes buildings into height ranges.
  • Creates a pie chart to visualize the distribution of building heights.

Requirements

  • Libraries:

    os

    json

    pandas

    matplotlib

File Structure

  • Vienna_102081_v20.city.json: The input CityJSON file containing city object data. It has been converted and upgraded from the CityGML file with citygml-tools and cjio command line.
  • main.py: The main Python script that processes the CityJSON data, calculates height distributions, and generates a pie chart.

Functions

1. load_cj_file(file_path):

  • Loads the CityJSON file from the specified path.
  • Returns the parsed JSON data.

2. buildings_heights(cj):

  • Extracts building and building part heights from the CityJSON data.
  • Returns a dictionary of building IDs and their corresponding heights.

3. height_distribution(bd_heights):

  • Categorizes the buildings based on their heights into 4 categories:

    '0-10m',

    '10-20m',

    '20-30m',

    '30m+'

  • Returns a pandas DataFrame showing the distribution of buildings across these height categories.

4. pie_chart(hd):

  • Generates a pie chart based on the height distribution.

  • Displays the chart with labeled height categories and percentage of buildings in each category.

5. main(file_path):

  • Integrates the above functions to process a CityJSON file, calculate building height distributions, and display a pie chart.