---
license: cc-by-nc-4.0
task_categories:
  - visual-question-answering
  - image-to-text

viewer: false

# Gated form configuration
extra_gated_fields:
  full_name: 
    type: "text"
    label: "Full Name"
  affiliation: 
    type: "text"
    label: "Affiliation / Organization"
  email: 
    type: "text"
    label: "Institutional Email (preferred)"
  country: 
    type: "country"
    label: "Country / Region"
  intended_use:
    type: "select"
    label: "Intended Use Case"
    options: ["Academic research", "Educational purpose", "Internal enterprise testing (non-commercial)", "Other"]
  non_commercial_use:
    type: "checkbox"
    label: "I confirm that this dataset will be used for non-commercial purposes only"
  data_protection_ack:
    type: "checkbox"
    label: "I confirm that I will not attempt to extract personal, sensitive, or confidential information from this dataset"

extra_gated_prompt: |
  To request access to the **ArchCAD** dataset, please complete the following form. 
  Access is restricted to non-commercial use. 
  All requests will be reviewed, and approval may take up to 3 business days.
---


# 🏗️ ArchCAD

[🇺🇸 English](README.md) | [🇨🇳 中文说明](README_zh-CN.md)

<div align="left">
 
[![arXiv](https://img.shields.io/badge/arXiv-2503.22346-b31b1b.svg)](https://arxiv.org/abs/2503.22346)  [![Code](https://img.shields.io/badge/Code-Github-blue)](https://github.com/ArchiAI-LAB/ArchCAD)  [![Dataset](https://img.shields.io/badge/Dataset-HuggingFace-yellow)](https://huggingface.co/datasets/jackluoluo/ArchCAD) 
 
</div>

*A Multimodal CAD Dataset for Vectorized Drawing Understanding*

> **40k Samples · 5 Strictly Aligned Modalities · Foundational Data for AI Understanding of Engineering Drawings**

---

## 📑 Table of Contents
- [What is ArchCAD?](#📘-what-is-archcad)
- [Key Features](#✨-key-features)
- [Dataset Structure](#🧩-dataset-structure)
  - [Data Modalities](#data-modalities)
  - [Annotations](#annotations)
- [Baseline Model: DPSS](#🏆-baseline-model-dpss)
- [Potential Applications](#🚀-potential-applications)
- [Citation](#📚-citation)

---

## 📘 What is ArchCAD?

AI systems have long struggled to interpret and utilize CAD drawings directly — a major bottleneck in automation for the construction industry.  
**ArchCAD** aims to address this challenge by providing a large-scale, high-quality CAD dataset with fine-grained, primitive-level annotations.  
It serves as a foundation for training AI models with deep multimodal understanding of architectural and engineering drawings.

Each sample is generated through a **“drawing slicing”** process, where each slice corresponds to a 14m × 14m area of a floor plan, aligned across multiple data modalities.

---

## ✨ Key Features
- **🧠 Rich Multimodal Data**: Each sample includes five synchronized data types — raster image, SVG, JSON, Q&A, and point cloud.  
- **🏛️ Primitive-Level Annotation**: Every geometric entity (e.g., line, arc, circle) within a slice carries both semantic and instance-level labels.  
- **🧩 Strict Data Alignment**: All five modalities correspond exactly by filename.  

---

## 🧩 Dataset Structure

### Data Modalities

<center>
    <img src="./assets/data_example.png">
</center>

Each ArchCAD sample provides five data modalities:  
1. **Rasterized Images**: Standard pixel representation of CAD drawings.  
2. **SVG Data (Vector Graphics)**: Preserves full vector information.  
    ```xml
    <svg>
      <path d="M x1, y1 L x2, y2" semantic="single_door" instance="single_door_23" stroke-width=1>
      <circle cx="x1" cy="y1" fill="none" r="r1" semantic="single_door" instance="single_door_23" stroke-width=1>
      ...
    </svg>
    ```
3. **JSON Data**: Explicit representation of every geometric element as an independent object with all properties stored as key-value pairs.
    ```json
    [
      {
        "type": "LINE", 
        "linetype": "Continuous", 
        "start": [x1, y1], 
        "end": [x2, y2], 
        "rgb": [0, 0, 0], 
        "semantic": "single_door", 
        "instance": "single_door_23"
      }, 
      {
        "type": "CIRCLE",
        "center": [x1, y1],
        "radius": r1, 
        "semantic": "single_door", 
        "instance": "single_door_23"
      }
    ]
    ```
4. **Q&A Pairs**: Automatically generated structured question-answer pairs for each drawing slice.
    - **question:** How many doors are in the drawing?  
      **answer:** There are 11 doors in total, including 7 single doors, 1 double door, 1 parent-child door, and 2 other types.  
    - **question:** What are the coordinates of the staircase?  
      **answer:** The bounding box of the staircase has vertices at (0, 624), (104, 624), (104, 827), (0, 827).  
5. **Point Cloud Data**: Key control points from geometric primitives (e.g., lines, arcs, circles) represented as 2D point clouds with class labels.

### Annotations

Each geometric primitive in ArchCAD carries semantic information, and countable entities additionally have instance-level labels:
- `semantic`: the semantic class of the primitive (mapping provided below).  
- `instance`: a unique identifier shared by all primitives belonging to the same object instance.

| ID  | Name               | Countable  |
|-----|--------------------|------------|
| 0   | Axis & Grid        | No         |
| 1   | Single Door        | Yes        |
| 2   | Double Door        | Yes        |
| 3   | Parent-Child Door  | Yes        |
| 4   | Other Door         | Yes        |
| 5   | Elevator           | Yes        |
| 6   | Staircase          | Yes        |
| 7   | Sink               | Yes        |
| 8   | Urinal             | Yes        |
| 9   | Toilet             | Yes        |
| 10  | Bathtub            | Yes        |
| 11  | Squat Toilet       | Yes        |
| 12  | Other Fixtures     | No         |
| 13  | Drain              | No         |
| 14  | Table              | Yes        |
| 15  | Chair              | Yes        |
| 16  | Bed                | Yes        |
| 17  | Sofa               | Yes        |
| 18  | Hole               | Yes        |
| 19  | Glass              | No         |
| 20  | Wall               | No         |
| 21  | Concrete Column    | Yes        |
| 22  | Steel Column       | Yes        |
| 23  | Concrete Beam      | No         |
| 24  | Steel Beam         | No         |
| 25  | Parking Space      | Yes        |
| 26  | Foundation         | No         |
| 27  | Pile               | Yes        |
| 28  | Rebar              | No         |
| 29  | Fire Hydrant       | Yes        |
| 100 | Others             | No         |

---


## 📚 Citation

If you use ArchCAD in your research, please cite the following paper:
```bibtex
@article{Luo2025ArchCAD,
  title={ArchCAD-400K: An Open Large-Scale Architectural CAD Dataset and New Baseline for Panoptic Symbol Spotting},
  author={Luo R, Liu Z, Cheng T, et al.},
  journal={arXiv preprint arXiv:2503.22346},
  year={2025}
}
```