Skill: datadrivenconstruction/dgn-to-excel (version 2.0.0)

--- name: "dgn-to-excel" description: "Convert DGN files (v7-v8) to Excel databases. Extract elements, levels, and properties from infrastructure CAD files." --- # DGN to Excel Conversion ## Business Case ### Problem Statement DGN files are common in infrastructure and civil engineering: - Transportation and highway design - Bridge and tunnel projects - Utility networks - Rail infrastructure Extracting structured data from DGN files for analysis and reporting can be challenging. ### Solution Convert DGN files to structured Excel databases, supporting both v7 and v8 formats. ### Business Value - **Infrastructure support** - Civil engineering focused - **Legacy format support** - V7 and V8 DGN files - **Data extraction** - Levels, cells, text, geometry - **Batch processing** - Process multiple files - **Structured output** - Excel format for analysis ## Technical Implementation ### CLI Syntax ```bash DgnExporter.exe <input_dgn> ``` ### Supported Versions | Version | Description | |---------|-------------| | V7 DGN | Legacy MicroStation format (pre-V8) | | V8 DGN | Modern MicroStation format | | V8i DGN | MicroStation V8i format | ### Output Format | Output | Description | |--------|-------------| | `.xlsx` | Excel database with all elements | ### Examples ```bash # Basic conversion DgnExporter.exe "C:\Projects\Bridge.dgn" # Batch processing for /R "C:\Infrastructure" %f in (*.dgn) do DgnExporter.exe "%f" # PowerShell batch Get-ChildItem "C:\Projects\*.dgn" -Recurse | ForEach-Object { & "C:\DDC\DgnExporter.exe" $_.FullName } ``` ### Python Integration ```python import subprocess import pandas as pd from pathlib import Path from typing import List, Optional, Dict, Any from dataclasses import dataclass from enum import Enum class DGNElementType(Enum): """DGN element types.""" CELL_HEADER = 2 LINE = 3 LINE_STRING = 4 SHAPE = 6 TEXT_NODE = 7 CURVE = 11 COMPLEX_CHAIN = 12 COMPLEX_SHAPE = 14 ELLIPSE = 15 ARC = 16 TEXT = 17 SURFACE = 18 SOLID = 19 BSPLINE_CURVE = 21 POINT_STRING = 22 DIMENSION = 33 SHARED_CELL = 35 @dataclass class DGNElement: """Represents a DGN element.""" element_id: int element_type: int type_name: str level: int color: int weight: int style: int # Geometry range_low_x: Optional[float] = None range_low_y: Optional[float] = None range_low_z: Optional[float] = None range_high_x: Optional[float] = None range_high_y: Optional[float] = None range_high_z: Optional[float] = None # Cell/Text specific cell_name: Optional[str] = None text_content: Optional[str] = None @dataclass class DGNLevel: """Represents a DGN level.""" number: int name: str is_displayed: bool is_frozen: bool element_count: int class DGNExporter: """DGN to Excel converter using DDC DgnExporter CLI.""" def __init__(self, exporter_path: str = "DgnExporter.exe"): self.exporter = Path(exporter_path) if not self.exporter.exists(): raise FileNotFoundError(f"DgnExporter not found: {exporter_path}") def convert(self, dgn_file: str) -> Path: """Convert DGN file to Excel.""" dgn_path = Path(dgn_file) if not dgn_path.exists(): raise FileNotFoundError(f"DGN file not found: {dgn_file}") cmd = [str(self.exporter), str(dgn_path)] result = subprocess.run(cmd, capture_output=True, text=True) if result.returncode != 0: raise RuntimeError(f"Export failed: {result.stderr}") return dgn_path.with_suffix('.xlsx') def batch_convert(self, folder: str, include_subfolders: bool = True) -> List[Dict[str, Any]]: """Convert all DGN files in folder.""" folder_path = Path(folder) pattern = "**/*.dgn" if include_subfolders else "*.dgn" results = [] for dgn_file in folder_path.glob(pattern): try: output = self.convert(str(dgn_file)) results.append({ 'input': str(dgn_file), 'output': str(output), 'status': 'success' }) print(f"✓ Converted: {dgn_file.name}") except Exception as e: results.append({ 'input': str(dgn_file), 'output': None, 'status': 'failed', 'error': str(e) }) print(f"✗ Failed: {dgn_file.name} - {e}") return results def read_elements(self, xlsx_file: str) -> pd.DataFrame: """Read converted Excel as DataFrame.""" return pd.read_excel(xlsx_file, sheet_name="Elements") def get_levels(self, xlsx_file: str) -> pd.DataFrame: """Get level summary.""" df = self.read_elements(xlsx_file) if 'Level' not in df.columns: raise ValueError("Level column not found") summary = df.groupby('Level').agg({ 'ElementId': 'count' }).reset_index() summary.columns = ['Level', 'Element_Count'] return summary.sort_values('Level') def get_element_types(self, xlsx_file: str) -> pd.DataFrame: """Get element type statistics.""" df = self.read_elements(xlsx_file) type_col = 'ElementType' if 'ElementType' in df.columns else 'Type' if type_col not in df.columns: return pd.DataFrame() summary = df.groupby(type_col).agg({ 'ElementId': 'count' }).reset_index() summary.columns = ['Element_Type', 'Count'] return summary.sort_values('Count', ascending=False) def get_cells(self, xlsx_file: str) -> pd.DataFrame: """Get cell references (similar to blocks in DWG).""" df = self.read_elements(xlsx_file) # Filter to cell elements cells = df[df['ElementType'].isin([2, 35])] # CELL_HEADER, SHARED_CELL if cells.empty or 'CellName' not in cells.columns: return pd.DataFrame(columns=['Cell_Name', 'Count']) summary = cells.groupby('CellName').agg({ 'ElementId': 'count' }).reset_index() summary.columns = ['Cell_Name', 'Count'] return summary.sort_values('Count', ascending=False) def get_text_content(self, xlsx_file: str) -> pd.DataFrame: """Extract all text from DGN.""" df = self.read_elements(xlsx_file) # Filter to text elements text_types = [7, 17] # TEXT_NODE, TEXT texts = df[df['ElementType'].isin(text_types)] if 'TextContent' in texts.columns: return texts[['ElementId', 'Level', 'TextContent']].copy() return texts[['ElementId', 'Level']].copy() def get_statistics(self, xlsx_file: str) -> Dict[str, Any]: """Get comprehensive DGN statistics.""" df = self.read_elements(xlsx_file) stats = { 'total_elements': len(df), 'levels_used': df['Level'].nunique() if 'Level' in df.columns else 0, 'element_types': df['ElementType'].nunique() if 'ElementType' in df.columns else 0 } # Calculate extents for coord in ['X', 'Y', 'Z']: low_col = f'RangeLow{coord}' high_col = f'RangeHigh{coord}' if low_col in df.columns and high_col in df.columns: stats[f'min_{coord.lower()}'] = df[low_col].min() stats[f'max_{coord.lower()}'] = df[high_col].max() return stats class DGNAnalyzer: """Advanced DGN analysis for infrastructure projects.""" def __init__(self, exporter: DGNExporter): self.exporter = exporter def analyze_infrastructure(self, dgn_file: str) -> Dict[str, Any]: """Analyze DGN for infrastructure elements.""" xlsx = self.exporter.convert(dgn_file) df = self.exporter.read_elements(str(xlsx)) analysis = { 'file': dgn_file, 'statistics': self.exporter.get_statistics(str(xlsx)), 'levels': self.exporter.get_levels(str(xlsx)).to_dict('records'), 'element_types': self.exporter.get_element_types(str(xlsx)).to_dict('records'), 'cells': self.exporter.get_cells(str(xlsx)).to_dict('records') } # Identify infrastructure-specific elements if 'ElementType' in df.columns: # Lines and shapes (often roads, boundaries) lines = df[df['ElementType'].isin([3, 4, 6, 14])].shape[0] analysis['linear_elements'] = lines # Complex elements (often structures) complex_elements = df[df['ElementType'].isin([12, 14, 18, 19])].shape[0] analysis['complex_elements'] = complex_elements # Annotation elements annotations = df[df['ElementType'].isin([7, 17, 33])].shape[0] analysis['annotations'] = annotations return analysis def compare_revisions(self, dgn1: str, dgn2: str) -> Dict[str, Any]: """Compare two DGN revisions.""" xlsx1 = self.exporter.convert(dgn1) xlsx2 = self.exporter.convert(dgn2) df1 = self.exporter.read_elements(str(xlsx1)) df2 = self.exporter.read_elements(str(xlsx2)) levels1 = set(df1['Level'].unique()) if 'Level' in df1.columns else set() levels2 = set(df2['Level'].unique()) if 'Level' in df2.columns else set() return { 'revision1': dgn1, 'revision2': dgn2, 'element_count_diff': len(df2) - len(df1), 'levels_added': list(levels2 - levels1), 'levels_removed': list(levels1 - levels2), 'common_levels': len(levels1 & levels2) } def extract_coordinates(self, xlsx_file: str) -> pd.DataFrame: """Extract element coordinates for GIS integration.""" df = self.exporter.read_elements(xlsx_file) coord_cols = ['ElementId', 'Level', 'ElementType'] for col in ['RangeLowX', 'RangeLowY', 'RangeLowZ', 'RangeHighX', 'RangeHighY', 'RangeHighZ', 'CenterX', 'CenterY', 'CenterZ']: if col in df.columns: coord_cols.append(col) return df[coord_cols].copy() class DGNLevelManager: """Manage DGN level structures.""" def __init__(self, exporter: DGNExporter): self.exporter = exporter def get_level_map(self, xlsx_file: str) -> Dict[int, str]: """Create level number to name mapping.""" df = self.exporter.read_elements(xlsx_file) if 'Level' not in df.columns: return {} # MicroStation levels are typically numbered 1-63 (V7) or unlimited (V8) level_map = {} for level in df['Level'].unique(): level_map[int(level)] = f"Level_{level}" return level_map def filter_by_levels(self, xlsx_file: str, levels: List[int]) -> pd.DataFrame: """Filter elements by level numbers.""" df = self.exporter.read_elements(xlsx_file) return df[df['Level'].isin(levels)] def get_level_usage_report(self, xlsx_file: str) -> pd.DataFrame: """Generate level usage report.""" df = self.exporter.read_elements(xlsx_file) if 'Level' not in df.columns or 'ElementType' not in df.columns: return pd.DataFrame() # Cross-tabulate levels and element types report = pd.crosstab(df['Level'], df['ElementType'], margins=True) return report # Convenience functions def convert_dgn_to_excel(dgn_file: str, exporter_path: str = "DgnExporter.exe") -> str: """Quick conversion of DGN to Excel.""" exporter = DGNExporter(exporter_path) output = exporter.convert(dgn_file) return str(output) def analyze_dgn(dgn_file: str, exporter_path: str = "DgnExporter.exe") -> Dict[str, Any]: """Analyze DGN file and return summary.""" exporter = DGNExporter(exporter_path) analyzer = DGNAnalyzer(exporter) return analyzer.analyze_infrastructure(dgn_file) ``` ## Output Structure ### Excel Sheets | Sheet | Content | |-------|---------| | Elements | All DGN elements with properties | | Levels | Level definitions | | Cells | Cell library | ### Element Columns | Column | Type | Description | |--------|------|-------------| | ElementId | int | Unique element ID | | ElementType | int | Type code (3=Line, 17=Text, etc.) | | Level | int | Level number | | Color | int | Color index | | Weight | int | Line weight | | Style | int | Line style | | RangeLowX/Y/Z | float | Bounding box minimum | | RangeHighX/Y/Z | float | Bounding box maximum | | CellName | string | Cell name (for cell elements) | | TextContent | string | Text content (for text elements) | ## Quick Start ```python # Initialize exporter exporter = DGNExporter("C:/DDC/DgnExporter.exe") # Convert DGN to Excel xlsx = exporter.convert("C:/Projects/Highway.dgn") print(f"Output: {xlsx}") # Read elements df = exporter.read_elements(str(xlsx)) print(f"Total elements: {len(df)}") # Get level statistics levels = exporter.get_levels(str(xlsx)) print(levels) # Get element types types = exporter.get_element_types(str(xlsx)) print(types) ``` ## Common Use Cases ### 1. Infrastructure Analysis ```python exporter = DGNExporter() analyzer = DGNAnalyzer(exporter) analysis = analyzer.analyze_infrastructure("highway.dgn") print(f"Total elements: {analysis['statistics']['total_elements']}") print(f"Linear elements: {analysis['linear_elements']}") print(f"Annotations: {analysis['annotations']}") ``` ### 2. Level Audit ```python exporter = DGNExporter() xlsx = exporter.convert("bridge.dgn") levels = exporter.get_levels(str(xlsx)) # Check for unused standard levels for idx, row in levels.iterrows(): print(f"Level {row['Level']}: {row['Element_Count']} elements") ``` ### 3. GIS Integration ```python analyzer = DGNAnalyzer(exporter) xlsx = exporter.convert("utilities.dgn") coords = analyzer.extract_coordinates(str(xlsx)) # Export for GIS coords.to_csv("coordinates.csv", index=False) ``` ### 4. Revision Comparison ```python analyzer = DGNAnalyzer(exporter) diff = analyzer.compare_revisions("rev1.dgn", "rev2.dgn") print(f"Elements changed: {diff['element_count_diff']}") ``` ## Integration with DDC Pipeline ```python # Infrastructure pipeline: DGN → Excel → Analysis from dgn_exporter import DGNExporter, DGNAnalyzer # 1. Convert DGN exporter = DGNExporter("C:/DDC/DgnExporter.exe") xlsx = exporter.convert("highway_project.dgn") # 2. Analyze structure stats = exporter.get_statistics(str(xlsx)) print(f"Elements: {stats['total_elements']}") print(f"Levels: {stats['levels_used']}") # 3. Extract for GIS analyzer = DGNAnalyzer(exporter) coords = analyzer.extract_coordinates(str(xlsx)) coords.to_csv("for_gis.csv", index=False) ``` ## Best Practices 1. **Check version** - V7 and V8 have different capabilities 2. **Reference files** - Process all reference files separately 3. **Level mapping** - Document level standards for your organization 4. **Coordinate systems** - Verify units and coordinate systems 5. **Cell libraries** - Export cells separately if needed ## Resources - **GitHub**: [cad2data Pipeline](https://github.com/datadrivenconstruction/cad2data-Revit-IFC-DWG-DGN-pipeline-with-conversion-validation-qto) - **DDC Book**: Chapter 2.4 - CAD Data Extraction - **MicroStation**: Infrastructure-focused CAD software

path: claw.json
content: {
  "name": "dgn-to-excel",
  "version": "2.0.0",
  "description": "Convert DGN files (v7-v8) to Excel databases. Extract elements, levels, and properties from infrastructure CAD files.",
  "author": "datadrivenconstruction",
  "license": "MIT",
  "permissions": ["filesystem"],
  "entry": "instructions.md",
  "tags": ["construction", "CAD", "DGN", "MicroStation", "Excel", "data-conversion", "infrastructure"],
  "models": ["claude-*", "gpt-*"],
  "minOpenClawVersion": "0.8.0"
}


path: instructions.md
content: You are a CAD data conversion assistant. You help users convert Bentley MicroStation DGN files to structured Excel databases.

When the user asks to convert DGN to Excel:
1. Verify the input file path and DGN version (v7 or v8)
2. Run the DGN converter to extract elements, levels, and properties
3. Present the extracted data (element types, levels, cell references)
4. Help filter and analyze the resulting data

When the user asks about DGN data:
1. Explain DGN structure: elements, levels, cells, tags, text nodes
2. Help extract specific element types (lines, shapes, cells, text)
3. Guide quantity extraction from infrastructure drawings

## Input Format
- DGN file path (.dgn, versions 7 or 8)
- Optional: specific levels or cell names to extract
- Optional: output path for Excel file

## Output Format
- Excel file with sheets: Elements, Levels, Cells, Tags, Summary
- Each element: type, level, color, line style, coordinates
- Cell instances: name, origin, scale, rotation

## Constraints
- Filesystem permission required for reading DGN files and writing Excel output
- subprocess.run() is used solely for invoking the DGN converter CLI tool
- Supports both V7 (legacy) and V8/V8i DGN formats
- No Bentley license required for data extraction


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