OpendTect/OpendTect
Oct 2024 – Oct 2025
13 Months active
Languages Used
C++JavaScriptSQLTextQMLConfigurationQtOpendTect Commands
Technical Skills
File Path ManipulationURI HandlingWindows API3D GraphicsAlgorithm OptimizationC++
Nanne Hemstra
PROFILE
Nanne Hemstra
Nanne Hemstra developed and maintained core features for the OpendTect/OpendTect repository, focusing on robust data workflows, UI enhancements, and cross-platform stability. Over 13 months, Nanne delivered features such as CSV import/export for color tables, dynamic UI controls, and expanded well data modeling, while addressing critical bugs in file handling and session management. Using C++ and the Qt framework, Nanne refactored code for maintainability, improved performance with multithreading, and ensured data integrity through defensive programming. The work demonstrated depth in backend and UI engineering, resulting in more reliable seismic data processing and a smoother user experience across Windows and Linux.
Overall Statistics
Feature vs Bugs
52%Features
Repository Contributions
144Total
Bugs
47
Commits
144
Features
51
Lines of code
7,324
Activity Months13
Your Network
15 peopleSame Organization
@dgbes.com5
Work History
October 2025
7 Commits • 4 Features
Oct 1, 2025October 2025: OpendTect/OpendTect delivered targeted data interoperability, UX improvements, and reliability fixes that enhance researcher workflows and reduce maintenance burden. Key feature work includes CSV import/export for color tables with a refactored multi-format export path and UI string updates; context-sensitive push button menus in the command driver; and UI usability enhancements via selective row/column handling in uiTable. In addition, critical reliability and data integrity fixes were implemented, including a tooltip enablement loop fix, a volumebuilder VDS single-component read naming fix, and obsolete script removal to simplify the codebase. Documentation URL correctness was also addressed to ensure accurate system requirements reference. Overall impact: smoother data workflows, fewer edge-case UI issues, and reduced technical debt, enabling faster delivery of data-driven results.
7 Commits • 4 Features
Oct 1, 2025October 2025: OpendTect/OpendTect delivered targeted data interoperability, UX improvements, and reliability fixes that enhance researcher workflows and reduce maintenance burden. Key feature work includes CSV import/export for color tables with a refactored multi-format export path and UI string updates; context-sensitive push button menus in the command driver; and UI usability enhancements via selective row/column handling in uiTable. In addition, critical reliability and data integrity fixes were implemented, including a tooltip enablement loop fix, a volumebuilder VDS single-component read naming fix, and obsolete script removal to simplify the codebase. Documentation URL correctness was also addressed to ensure accurate system requirements reference. Overall impact: smoother data workflows, fewer edge-case UI issues, and reduced technical debt, enabling faster delivery of data-driven results.
October 2025
September 2025
16 Commits • 3 Features
Sep 1, 2025September 2025 monthly summary for OpendTect/OpendTect focusing on business value and technical achievements: Key features delivered: - Color handling improvements for color tables and line data. Fix color handling: sort color table names on import for consistent display and processing; ensure stored color settings are respected when adding default data for random lines. Related commits: 9749c3c2bd012706178d55e845dadda741f8551c, 1c8d576fda2ef70efe967867393a8554e99d79f0. - Code quality and refactoring across core components: move function implementations from headers to source files, standardize case sensitivity, and perform cleanup to improve readability, maintainability, and build reliability. Related commits include: 9bb084ffc989dedb394572da390d8169a64c1b4e, f8dea6792c352461eb5b80c812b750e8a1ea6f44, af86a0334fa9adb0dbc4d25ea59bcc01fd6f7906, f14baaa2fbfefa962bc06c44cb516ce82dddb4cf, 4ae127e6c2a316bb42fe89c84e5639d6d6615c5c, 375fb6c5afd09030a65d64017ac6b5f90d59de1b, 6e58ed1588662545c9415be6e8b8f2a549b0bdba, c1758271ba8c0a387b3a38db8253cfd7602a0508. - UI labeling and export naming enhancements: dynamic survey name updates; include the selected line name in 2D export filenames; more informative spectral plot titles. Commits: 91480c7d17859aa003f3f992b27f7552457bcb2e, 0bd64d0874587223630feabcd248a, 868e875ba93e1a3b48ff864bdc65bf40bdb6c15c. - UI filtering and volume display correctness: fix empty filter strings and skip non-existent seismic volumes in attribute selections. Commits: bc30d100f63ad013d614850e628aac46c96ede3f, 67aae2129a3ba7748c5333da5c5d0da3ad3ba345. Major bugs fixed: - Windows permissions initialization: Initialize iswindowsattr_ and standardize boolean member initialization to address Windows-related attribute handling issues. Commit: 97c5b59bf982d0006b478d900c96bd0b3b472b81. - UI filtering/volume display bugs: prevent empty filter strings from appearing as an asterisk and do not show non-existent volumes in attribute selections. Commits: bc30d100f63ad013d614850e628aac46c96ede3f, 67aae2129a3ba7748c5333da5c5d0da3ad3ba345. Overall impact and accomplishments: - Significantly improved user experience with color table management and per-line data visualization, delivering deterministic, user-friendly import behavior and respecting stored color configurations. - Strengthened code quality and maintainability across core components, reducing future bug risk and enabling faster feature iteration. - Improved export naming and labeling for easier file organization and traceability in workflows, plus clearer spectral plot titles. - Hardened UI reliability with robust filtering and volume handling, reducing confusion and misconfiguration in typical seismic data workstreams. - Cross-platform stability with explicit Windows attribute handling, contributing to fewer platform-specific defects. Technologies/skills demonstrated: - C++, large-scale refactoring, and header-to-source migration patterns; enum usage (OD::CaseSensitivity); cross-module cleanup to improve build reliability. - UI/UX improvements: dynamic labeling, export naming, and informative plot titles; robust UI state handling for filtering and attributes. - Data processing and I/O considerations: color table import handling, stored settings, and Seis::SequentialReader initialization for prepared data flows.
September 2025
16 Commits • 3 Features
Sep 1, 2025September 2025 monthly summary for OpendTect/OpendTect focusing on business value and technical achievements: Key features delivered: - Color handling improvements for color tables and line data. Fix color handling: sort color table names on import for consistent display and processing; ensure stored color settings are respected when adding default data for random lines. Related commits: 9749c3c2bd012706178d55e845dadda741f8551c, 1c8d576fda2ef70efe967867393a8554e99d79f0. - Code quality and refactoring across core components: move function implementations from headers to source files, standardize case sensitivity, and perform cleanup to improve readability, maintainability, and build reliability. Related commits include: 9bb084ffc989dedb394572da390d8169a64c1b4e, f8dea6792c352461eb5b80c812b750e8a1ea6f44, af86a0334fa9adb0dbc4d25ea59bcc01fd6f7906, f14baaa2fbfefa962bc06c44cb516ce82dddb4cf, 4ae127e6c2a316bb42fe89c84e5639d6d6615c5c, 375fb6c5afd09030a65d64017ac6b5f90d59de1b, 6e58ed1588662545c9415be6e8b8f2a549b0bdba, c1758271ba8c0a387b3a38db8253cfd7602a0508. - UI labeling and export naming enhancements: dynamic survey name updates; include the selected line name in 2D export filenames; more informative spectral plot titles. Commits: 91480c7d17859aa003f3f992b27f7552457bcb2e, 0bd64d0874587223630feabcd248a, 868e875ba93e1a3b48ff864bdc65bf40bdb6c15c. - UI filtering and volume display correctness: fix empty filter strings and skip non-existent seismic volumes in attribute selections. Commits: bc30d100f63ad013d614850e628aac46c96ede3f, 67aae2129a3ba7748c5333da5c5d0da3ad3ba345. Major bugs fixed: - Windows permissions initialization: Initialize iswindowsattr_ and standardize boolean member initialization to address Windows-related attribute handling issues. Commit: 97c5b59bf982d0006b478d900c96bd0b3b472b81. - UI filtering/volume display bugs: prevent empty filter strings from appearing as an asterisk and do not show non-existent volumes in attribute selections. Commits: bc30d100f63ad013d614850e628aac46c96ede3f, 67aae2129a3ba7748c5333da5c5d0da3ad3ba345. Overall impact and accomplishments: - Significantly improved user experience with color table management and per-line data visualization, delivering deterministic, user-friendly import behavior and respecting stored color configurations. - Strengthened code quality and maintainability across core components, reducing future bug risk and enabling faster feature iteration. - Improved export naming and labeling for easier file organization and traceability in workflows, plus clearer spectral plot titles. - Hardened UI reliability with robust filtering and volume handling, reducing confusion and misconfiguration in typical seismic data workstreams. - Cross-platform stability with explicit Windows attribute handling, contributing to fewer platform-specific defects. Technologies/skills demonstrated: - C++, large-scale refactoring, and header-to-source migration patterns; enum usage (OD::CaseSensitivity); cross-module cleanup to improve build reliability. - UI/UX improvements: dynamic labeling, export naming, and informative plot titles; robust UI state handling for filtering and attributes. - Data processing and I/O considerations: color table import handling, stored settings, and Seis::SequentialReader initialization for prepared data flows.
August 2025
3 Commits • 1 Features
Aug 1, 2025Aug 2025 monthly summary for OpendTect/OpendTect. Focused on stabilizing horizon tessellation, expanding UI capability for bulk selection, and hardening mnemonic handling and .defs color validation. These changes improve horizon rendering reliability, streamline data management workflows, and reduce crash risk during mnemonic creation and .defs handling. Key deliverables include three targeted changes with direct commits:
3 Commits • 1 Features
Aug 1, 2025Aug 2025 monthly summary for OpendTect/OpendTect. Focused on stabilizing horizon tessellation, expanding UI capability for bulk selection, and hardening mnemonic handling and .defs color validation. These changes improve horizon rendering reliability, streamline data management workflows, and reduce crash risk during mnemonic creation and .defs handling. Key deliverables include three targeted changes with direct commits:
August 2025
July 2025
15 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for OpendTect/OpendTect: Delivered targeted UI and data-model enhancements, stability fixes, and data-reporting improvements that directly increase user productivity, data accuracy, and system reliability. Key features shipped include dynamic UI sizing and color handling in the data model, plus Qt-free IODirTableModel internal date handling for leaner builds. UI/UX consistency improvements also enhanced user feedback channels.
July 2025
15 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for OpendTect/OpendTect: Delivered targeted UI and data-model enhancements, stability fixes, and data-reporting improvements that directly increase user productivity, data accuracy, and system reliability. Key features shipped include dynamic UI sizing and color handling in the data model, plus Qt-free IODirTableModel internal date handling for leaner builds. UI/UX consistency improvements also enhanced user feedback channels.
June 2025
5 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for OpendTect/OpendTect: Delivered a mix of feature improvements and critical bug fixes that enhance seismic processing accuracy, data preloading reliability, and workflow stability. This period focused on business value through accurate attribute behavior (phase rotation fix), robust S3 preloading, improved documentation path resolution, and a smoother export experience with automatic horizon list refresh, while also tightening code quality (naming fix across files).
5 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for OpendTect/OpendTect: Delivered a mix of feature improvements and critical bug fixes that enhance seismic processing accuracy, data preloading reliability, and workflow stability. This period focused on business value through accurate attribute behavior (phase rotation fix), robust S3 preloading, improved documentation path resolution, and a smoother export experience with automatic horizon list refresh, while also tightening code quality (naming fix across files).
June 2025
May 2025
10 Commits • 5 Features
May 1, 20252025-05 monthly summary: Delivered high-impact features, data-model enhancements, and stability improvements for OpendTect/OpendTect. The work streamlined access to survey data, improved bulk import workflows, extended the Well::Info data model, and reinforced UI consistency and session reliability, driving faster insights and reduced operational risk.
May 2025
10 Commits • 5 Features
May 1, 20252025-05 monthly summary: Delivered high-impact features, data-model enhancements, and stability improvements for OpendTect/OpendTect. The work streamlined access to survey data, improved bulk import workflows, extended the Well::Info data model, and reinforced UI consistency and session reliability, driving faster insights and reduced operational risk.
April 2025
19 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for OpendTect/OpendTect: Focused stability, usability, and extensibility to deliver reliable data interpretation and smoother workflows. Resolved critical crashes across core modules (log display, well data generation, horizon dialogs) through stricter null checks and explicit IOPar usage, and tightened persistence encoding. Implemented UI and UX improvements for tool interaction and construction-time context, while expanding plugin configurability and project-wide maintenance. Enhanced PDF editing with axis unit labels and related UI tweaks, and introduced immediate-context tooltips during object construction. Performed internal maintenance to align with Qt 6.9.0, simplify constructors, and standardize naming conventions. These efforts reduce support incidents, accelerate data interpretation, and establish a stronger foundation for plugin-driven configurations.
19 Commits • 5 Features
Apr 1, 2025April 2025 monthly summary for OpendTect/OpendTect: Focused stability, usability, and extensibility to deliver reliable data interpretation and smoother workflows. Resolved critical crashes across core modules (log display, well data generation, horizon dialogs) through stricter null checks and explicit IOPar usage, and tightened persistence encoding. Implemented UI and UX improvements for tool interaction and construction-time context, while expanding plugin configurability and project-wide maintenance. Enhanced PDF editing with axis unit labels and related UI tweaks, and introduced immediate-context tooltips during object construction. Performed internal maintenance to align with Qt 6.9.0, simplify constructors, and standardize naming conventions. These efforts reduce support incidents, accelerate data interpretation, and establish a stronger foundation for plugin-driven configurations.
April 2025
March 2025
8 Commits • 6 Features
Mar 1, 2025March 2025 – OpendTect/OpendTect: Delivered core feature enhancements across data modeling, UI, and time handling, with emphasis on data integrity, UX clarity, and cross‑platform presentation. The work improves geospatial data management, marker context, UI signals, and precise time display, enabling more efficient workflows and reliable data transfer.
March 2025
8 Commits • 6 Features
Mar 1, 2025March 2025 – OpendTect/OpendTect: Delivered core feature enhancements across data modeling, UI, and time handling, with emphasis on data integrity, UX clarity, and cross‑platform presentation. The work improves geospatial data management, marker context, UI signals, and precise time display, enabling more efficient workflows and reliable data transfer.
February 2025
25 Commits • 9 Features
Feb 1, 2025February 2025: OpendTect/OpendTect delivered UI refinements, enhanced material modeling, and stability improvements, driving better user productivity and data integrity. Key features delivered include a UI Password Icon for secure, discoverable credential cues; addition of shear modulus calculations for richer material property modeling; histogram update optimization to avoid unnecessary processing when the histogram is not visible; a refactor moving the ObjectType enum to a dedicated emposid.h header for cleaner architecture; and HorizonUtils adaptation to properly handle 2D DataPointSet workflows. These features collectively improve usability, accuracy of material property representations, and performance in common workflows.
25 Commits • 9 Features
Feb 1, 2025February 2025: OpendTect/OpendTect delivered UI refinements, enhanced material modeling, and stability improvements, driving better user productivity and data integrity. Key features delivered include a UI Password Icon for secure, discoverable credential cues; addition of shear modulus calculations for richer material property modeling; histogram update optimization to avoid unnecessary processing when the histogram is not visible; a refactor moving the ObjectType enum to a dedicated emposid.h header for cleaner architecture; and HorizonUtils adaptation to properly handle 2D DataPointSet workflows. These features collectively improve usability, accuracy of material property representations, and performance in common workflows.
February 2025
January 2025
15 Commits • 6 Features
Jan 1, 2025January 2025 performance summary for OpendTect/OpendTect. Delivered notable features to enhance 3D visualization and user workflows, strengthened data integrity, and improved system robustness across file handling, server path formatting, and network storage reporting. Highlights include: improved 3D viewer startup and rendering; UI customization with dynamic button callbacks and 2D color table management; added Database Schema Introspection API; and key reliability fixes to data insertion, file selection flow, and server path handling. These changes reduce user confusion, prevent crashes, and provide a stronger foundation for data processing and collaboration. Technologies exercised included C++ UI engineering, data validation, path handling, networking diagnostics, and performance-oriented coding practices.
January 2025
15 Commits • 6 Features
Jan 1, 2025January 2025 performance summary for OpendTect/OpendTect. Delivered notable features to enhance 3D visualization and user workflows, strengthened data integrity, and improved system robustness across file handling, server path formatting, and network storage reporting. Highlights include: improved 3D viewer startup and rendering; UI customization with dynamic button callbacks and 2D color table management; added Database Schema Introspection API; and key reliability fixes to data insertion, file selection flow, and server path handling. These changes reduce user confusion, prevent crashes, and provide a stronger foundation for data processing and collaboration. Technologies exercised included C++ UI engineering, data validation, path handling, networking diagnostics, and performance-oriented coding practices.
December 2024
12 Commits • 4 Features
Dec 1, 2024December 2024 (OpendTect/OpendTect) focused on stabilizing the platform, accelerating data workflows, and expanding data handling capabilities. Key features delivered include: (1) 2D Seismic Data Loading Performance improvements via multi-threaded geometry reading and optimized lookups; refactoring of sequential CubeData readers to speed processing. (2) UI Table Text Alignment to improve readability and data presentation. (3) Data Handling API Enhancements adding StringPairSet set/getValue and file-based JSON read/write overloads for ValueSet, enabling easier manipulation and persistence of key-value data. (4) HTTP Request Enhancements enabling encoded data support and raw header manipulation with proper Content-Length handling. In parallel, a targeted set of bug fixes improved build stability and runtime correctness, addressing compiler errors, missing headers, mExpClass, a survey copy crash, and SVN path handling during folder rename. Overall impact: faster data processing, more reliable builds, and richer data persistence and HTTP data exchange capabilities. Technologies demonstrated: multi-threading and performance optimization, API design and extension, JSON-based persistence, header-level HTTP control, and UI presentation improvements.
12 Commits • 4 Features
Dec 1, 2024December 2024 (OpendTect/OpendTect) focused on stabilizing the platform, accelerating data workflows, and expanding data handling capabilities. Key features delivered include: (1) 2D Seismic Data Loading Performance improvements via multi-threaded geometry reading and optimized lookups; refactoring of sequential CubeData readers to speed processing. (2) UI Table Text Alignment to improve readability and data presentation. (3) Data Handling API Enhancements adding StringPairSet set/getValue and file-based JSON read/write overloads for ValueSet, enabling easier manipulation and persistence of key-value data. (4) HTTP Request Enhancements enabling encoded data support and raw header manipulation with proper Content-Length handling. In parallel, a targeted set of bug fixes improved build stability and runtime correctness, addressing compiler errors, missing headers, mExpClass, a survey copy crash, and SVN path handling during folder rename. Overall impact: faster data processing, more reliable builds, and richer data persistence and HTTP data exchange capabilities. Technologies demonstrated: multi-threading and performance optimization, API design and extension, JSON-based persistence, header-level HTTP control, and UI presentation improvements.
December 2024
November 2024
8 Commits • 5 Features
Nov 1, 2024November 2024 monthly summary for OpendTect/OpendTect focusing on business value, stability, and performance improvements. Delivered UI enhancements, performance optimizations, and data accessibility improvements, while hardening resource management and preventing data corruption in the UI layer. Demonstrated strong C++ platform skills, multithreading readiness, and high-precision data handling to support more reliable operations in production environments.
November 2024
8 Commits • 5 Features
Nov 1, 2024November 2024 monthly summary for OpendTect/OpendTect focusing on business value, stability, and performance improvements. Delivered UI enhancements, performance optimizations, and data accessibility improvements, while hardening resource management and preventing data corruption in the UI layer. Demonstrated strong C++ platform skills, multithreading readiness, and high-precision data handling to support more reliable operations in production environments.
October 2024
1 Commits
Oct 1, 2024Month: 2024-10 — Focused on stabilizing cross-platform path handling in OpendTect. Implemented a critical bug fix to preserve proper Windows URI path formatting, preventing Windows-specific separators from being appended to URIs in FilePath utilities. The change reduces platform-specific errors in fullPath() and pathOnly(), improving reliability for cross-platform asset references and workflows. This aligns with ongoing portability goals and reduces risk for Windows-based workflows.
1 Commits
Oct 1, 2024Month: 2024-10 — Focused on stabilizing cross-platform path handling in OpendTect. Implemented a critical bug fix to preserve proper Windows URI path formatting, preventing Windows-specific separators from being appended to URIs in FilePath utilities. The change reduces platform-specific errors in fullPath() and pathOnly(), improving reliability for cross-platform asset references and workflows. This aligns with ongoing portability goals and reduces risk for Windows-based workflows.
October 2024
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Quality Metrics
Correctness87.4%
Maintainability87.0%
Architecture81.2%
Performance80.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++ConfigurationJavaScriptOpendTect CommandsQMLQtSQLText
Technical Skills
3D GraphicsAPI DesignAPI DevelopmentAlgorithm OptimizationApplication StabilityAsset ManagementAttribute AnalysisAttribute ManagementBackend DevelopmentBug FixBug FixingBuild System OptimizationBuild SystemsC++C++ Development
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