matsim-org/matsim-libs
Dec 2024 – Feb 2026
5 Months active
Languages Used
GroovyJavaXML
Technical Skills
Backend DevelopmentData AnalysisData VisualizationGeospatial AnalysisMATSim SimulationAPI Development
Friedrich Völkers
PROFILE
Friedrich Völkers
Over five months, contributed to the matsim-org/matsim-libs repository by building advanced data visualization and analysis tools for transportation simulation. Developed dashboards and toolkits for spatial, impact, and time-based analysis, integrating Java and Groovy for backend processing and visualization logic. Enhanced MATSim’s simwrapper contrib with features like customizable XYTime plots, time sliders, and Plotly dataset filtering, enabling more granular exploration of simulation outputs. Refactored visualization components for maintainability and scalability, consolidating shared logic and improving code quality. Focused on enabling data-driven decision making for analysts and stakeholders, with a strong emphasis on traceability, collaboration, and robust software development practices.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
5Total
Bugs
0
Commits
5
Features
5
Lines of code
3,069
Activity Months5
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Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a major enhancement to MATSim Visualization by adding Plotly Visualization Filtering, enabling dataset-level filtering within Plotly visualizations for more refined and actionable insights. Implemented in matsim-libs via the simwrapper contrib, including new traces and filter support (PR #4748). Commit 9a76a61932257c44aa2eba25c31bd5990b5c0bff. Co-authored by Friedrich Völkers. This work improves stakeholder ability to isolate scenarios of interest, accelerating data-driven decision making.
1 Commits • 1 Features
Feb 1, 2026February 2026: Delivered a major enhancement to MATSim Visualization by adding Plotly Visualization Filtering, enabling dataset-level filtering within Plotly visualizations for more refined and actionable insights. Implemented in matsim-libs via the simwrapper contrib, including new traces and filter support (PR #4748). Commit 9a76a61932257c44aa2eba25c31bd5990b5c0bff. Co-authored by Friedrich Völkers. This work improves stakeholder ability to isolate scenarios of interest, accelerating data-driven decision making.
February 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12 — Summary: Delivered time-based visualization enhancements for GridMap and unified background layer support across Matsim visualizations, improving data exploration capabilities and consistency. Refactored backgroundLayer logic into a new VizMap base class to enable reuse and scalability across visualization components. This work reduces setup complexity for time-series analyses and prepares the codebase for broader visualization features. Overall impact: Enhanced product value by enabling time-aware insights for analysts and researchers, while improving maintainability through architectural refactoring and standardized visualization behavior. Technologies/skills demonstrated: GridMap visualization, timeSelector/timeSlider integration, backgroundLayer architecture, refactoring for base-class consolidation, cross-team collaboration and code quality.
December 2025
1 Commits • 1 Features
Dec 1, 2025Month: 2025-12 — Summary: Delivered time-based visualization enhancements for GridMap and unified background layer support across Matsim visualizations, improving data exploration capabilities and consistency. Refactored backgroundLayer logic into a new VizMap base class to enable reuse and scalability across visualization components. This work reduces setup complexity for time-series analyses and prepares the codebase for broader visualization features. Overall impact: Enhanced product value by enabling time-aware insights for analysts and researchers, while improving maintainability through architectural refactoring and standardized visualization behavior. Technologies/skills demonstrated: GridMap visualization, timeSelector/timeSlider integration, backgroundLayer architecture, refactoring for base-class consolidation, cross-team collaboration and code quality.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for matsim-libs: Delivered XYTime Visualization Enhancements in the simwrapper contrib to enable breakpoints, color ramps, and customizable radii for XYTime plots, enhancing the detail and readability of simulation outputs. No major bugs fixed this month; maintenance focused on stability and code quality. Impact: improved analysis and presentation of simulation results, enabling faster insight generation for stakeholders. Technologies/skills demonstrated: visualization customization, commit-based traceability, and module collaboration in the simwrapper contrib (addressing #3710).
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for matsim-libs: Delivered XYTime Visualization Enhancements in the simwrapper contrib to enable breakpoints, color ramps, and customizable radii for XYTime plots, enhancing the detail and readability of simulation outputs. No major bugs fixed this month; maintenance focused on stability and code quality. Impact: improved analysis and presentation of simulation results, enabling faster insight generation for stakeholders. Technologies/skills demonstrated: visualization customization, commit-based traceability, and module collaboration in the simwrapper contrib (addressing #3710).
February 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025Month: 2025-01 | Repository: matsim-org/matsim-libs Key features delivered: - Impact Analysis Dashboard and Analysis Toolkit, introducing a new ImpactAnalysis class to process and visualize traffic and emission data. - Enhancements to CommandRunner and dependency management with improved error handling and output formatting. Major bugs fixed: - No separate bug-fix tasks recorded this month. The feature work included stability improvements in error handling and output formatting to reduce runtime issues. Overall impact and accomplishments: - Established a data-driven analytics foundation for transport planning, enabling faster, more reliable decision-making through dashboards and reusable analytics. - Improved developer experience and system reliability with robust error handling and clearer CLI output. Technologies/skills demonstrated: - Java-based class design (ImpactAnalysis), data processing and visualization integration, CLI tooling improvements, error handling, and dependency management. Commit referenced: b4f1bdd980ce3fdc7fdbd58865a5082717f74939
January 2025
1 Commits • 1 Features
Jan 1, 2025Month: 2025-01 | Repository: matsim-org/matsim-libs Key features delivered: - Impact Analysis Dashboard and Analysis Toolkit, introducing a new ImpactAnalysis class to process and visualize traffic and emission data. - Enhancements to CommandRunner and dependency management with improved error handling and output formatting. Major bugs fixed: - No separate bug-fix tasks recorded this month. The feature work included stability improvements in error handling and output formatting to reduce runtime issues. Overall impact and accomplishments: - Established a data-driven analytics foundation for transport planning, enabling faster, more reliable decision-making through dashboards and reusable analytics. - Improved developer experience and system reliability with robust error handling and clearer CLI output. Technologies/skills demonstrated: - Java-based class design (ImpactAnalysis), data processing and visualization integration, CLI tooling improvements, error handling, and dependency management. Commit referenced: b4f1bdd980ce3fdc7fdbd58865a5082717f74939
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for matsim-libs: Delivered MATSim Activity Dashboard and Spatial Analysis Tool enabling visualization and comparison of simulated activity counts and densities against reference data, with shapefile-based regional aggregation for spatial-pattern analysis. The work is implemented and documented in commit 1c940ae9382385b67e23f2f146d31dd3041fe05c (#3544). No major bugs fixed this month. Overall impact: enhanced validation, regional insights, and decision-support for transportation planning. Technologies/skills demonstrated: GIS shapefile integration, data visualization, dashboard analytics, version control traceability.
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for matsim-libs: Delivered MATSim Activity Dashboard and Spatial Analysis Tool enabling visualization and comparison of simulated activity counts and densities against reference data, with shapefile-based regional aggregation for spatial-pattern analysis. The work is implemented and documented in commit 1c940ae9382385b67e23f2f146d31dd3041fe05c (#3544). No major bugs fixed this month. Overall impact: enhanced validation, regional insights, and decision-support for transportation planning. Technologies/skills demonstrated: GIS shapefile integration, data visualization, dashboard analytics, version control traceability.
December 2024
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Quality Metrics
Correctness82.0%
Maintainability80.0%
Architecture82.0%
Performance74.0%
AI Usage24.0%
Skills & Technologies
Programming Languages
GroovyJavaXML
Technical Skills
API DevelopmentBackend DevelopmentCode RefactoringData AnalysisData VisualizationDependency ManagementFull Stack DevelopmentGeospatial AnalysisJavaJava DevelopmentMATSim SimulationSimulation SoftwareSoftware DevelopmentUnit TestingVisualization
Repositories Contributed To
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