VC Map is a JavaScript framework and API for building dynamic, web-based map applications that support the integration of 2D data, oblique imagery, and large-scale 3D geospatial datasets. It provides a set of configurable tools and plugins for map interaction, while also exposing an API that allows developers to extend functionalities or embed VC Map components into other applications.

Within the CHEK project, VC Map is used as a front-end environment to support different stages of the Digital Building Permit (DBP) workflow. Its role can be summarized in three main steps:

• Information collection (applicant): VC Map allows applicants to gather initial contextual information such as terrain models, surrounding buildings, and plot data from the city model.
• Pre-checking of rules (applicant): Applicants can use VC Map for visualization, placing the building design in the map for visual inspection and preliminary assessment before submission.
• Automated rule-checking (municipality): VC Map connects to the CHEK DBP platform to support municipalities in running compliance checks, where the submitted design is tested against specified rules.

Through these functions, VC Map acts as a shared interface between applicants and municipalities, linking geospatial and BIM data with compliance checking services in the DBP process.

The CityGML Checker is an application for validating semantic and geometric aspects of CityGML or CityJSON datasets. It verifies data requirements such as whether all buildings contain at least a wall or whether they conform to a required Level of Detail. Validation rules can be defined using SHACL or built from available rule blocks. The tool is available as a hosted service or via Docker, with execution supported both through a user interface and OGC API Processes.

Within the CHEK project, the CityGML Checker contributes to the pre-submission stage (applicant): it enables applicants to validate CityGML or CityJSON models against geometric and semantic requirements, ensuring conformance with specified rules before further processing.

This solution converts GML, CityGML, or CityJSON datasets into IFC files (IFC4 ADD2 TC1). It retains geometry, mapped items for reused geometry, and property information. Classifications are preserved and mapped to IFC, while colors can either be maintained or overridden according to user preferences. A mapping table allows user-defined alignment of CityGML semantics with IFC properties to ensure conformity with IDS.

Within the CHEK project, the GIS to BIM converter contributes to the pre-submission stage (applicant): it enables applicants to transform CityGML or CityJSON datasets into IFC models, preserving geometry, semantics, and classifications for use in the subsequent rule-checking process.

The IfcEnvelopeExtractor automates the extraction of building shells from IFC models and converts them into CityJSON models. This process enables rapid analysis of designs at the city scale, avoiding the need for manual conversion. The tool can generate CityJSON models with overhangs (LoD 3.0, 3.2, and voxelized shapes) as well as interior spaces and storeys across various levels of detail (LoD 0.2, 0.3, 1.2, 2.2, 3.0, 3.1, 3.2, and voxelized). Extraction can be tailored depending on the model’s quality and the required LoD.

Within the CHEK project, IfcEnvelopeExtractor contributes to the pre-submission stage (applicant): it enables applicants to convert IFC models into CityJSON by extracting outer envelopes at different levels of detail, providing semantic input for compliance checking and situating the design within its geospatial context.

IfcGref is a web-based tool designed to enable accurate georeferencing of IFC files, thereby supporting the integration of BIM and GIS data. The tool introduces the main concepts of IFC georeferencing and provides a step-by-step workflow for aligning IFC models with real-world coordinates. Users can upload IFC files, select a georeferencing method, input additional geographic data where necessary, and download a georeferenced version of the file. The tool also includes visualization capabilities, allowing users to inspect the georeferenced IFC file against basemaps such as OpenStreetMap, 3D, or satellite imagery. It further supports the adjustment of vertical rendering to refine model placement in the spatial context.

Within the CHEK project, IfcGref contributes to the pre-submission stage (applicant): it enables applicants to verify whether an IFC file is correctly georeferenced, and where needed, to improve accuracy by adding surveying points before proceeding with rule-checking and validation.

The IFC Checker validates IFC or STEP files against the EXPRESS schema defined by ISO 10303-11. It further supports validation against IDS 1.0 files and checks Property Set Definitions (PSDs) to ensure compliance with predefined property sets in the IFC standard.

Within the CHEK project, the IFC Checker contributes to the pre-submission stage (applicant): it allows applicants to validate IFC files against the EXPRESS schema, IDS requirements, and property set definitions, providing automated quality assurance prior to submission.1

The IFC Exporter consists of plugins for Revit and Archicad that support exporting BIM models in IFC format for submission. The installation and use process is covered by CHEK demonstration videos, showing how models can be exported in line with Information Delivery Specification (IDS) requirements.

Within the CHEK project, the IFC Exporter contributes to the submission stage (applicant): it allows applicants to export IFC files from Revit or Archicad in accordance with Information Delivery Specification (IDS) requirements before uploading them to the CHEK platform.

The IFC Signature module provides functionality for digitally signing IFC files, ensuring both proof of origin and proof of non-adulteration. It is available as a standalone module or via a REST API for integration into workflows. Two strategies are supported: embedding the signature and metadata inside the IFC file itself or storing the signature separately. This ensures authenticity and integrity of submitted files in the DBP process.

Within the CHEK project, the IFC Signature service contributes to the submission stage (applicant): it provides applicants with the means to digitally sign IFC files, ensuring both proof of authorship and protection against subsequent modification before the model enters the validation workflow.

CYPEURBAN is a software application designed to evaluate urban planning compliance directly on IFC models. It focuses on regulatory parameters such as plot dimensions, occupancy, buildability, and building heights. Within the Digital Building Permit (DBP) process, it functions as a tool for assessing whether proposed designs meet applicable planning regulations.

In the context of the CHEK project, CYPEURBAN is applied at two stages:

• Pre-checking of rules (applicant): Applicants can use CYPEURBAN to check their designs against specified planning rules prior to formal submission.
• Automated rule-checking (municipality): Municipalities can apply the same rule checks to verify compliance of submitted models during the validation process.

This dual role situates CYPEURBAN as a regulatory checking environment that supports both applicants and authorities within the DBP workflow.

Verifi3D, developed by Xinaps, is a cloud solution for BIM model checking. It combines a 3D viewer with classification and rule engines that allow creation and reuse of rule templates. The platform connects with multiple common data environments (CDEs) and issue trackers, supporting both open and proprietary formats. Input can include IFC or Revit models along with encoded regulations (e.g. CHEK WP2 rules). Outputs include interactive results, Excel/CSV exports, BCF, and links to issue trackers such as BIM 360, BIMcollab, and BIM Track.

Within the CHEK project, Verifi3D contributes to the digital building permit stage (municipality): it allows municipalities to carry out automated rule-checking of BIM models against encoded regulations, with results presented interactively and exportable to common issue-tracking systems.