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Translating from CAD to GIS enables the CAD drawings to become enhanced with spatial information and attributes.The data in a CAD file requires manipulation to extract valuable information,such as geometries and labels,to fit the data structure of GIS data.This article provides an overview of some common tasks involved in a CAD to GIS transformation.
In the example workspace,the following tasks are performed to translate from a MicroStation DGN file to an Esri File Geodatabase:
In the workspace,the MicroStation DGN (*.dgn) file (NorthVancouver.dgn) is read using the Bentley MicroStation Design (V8) reader.Under Parameters,Group Elements By > Level Names is selected,so that the feature types will be represented by name rather than by number.If known,you are required to specify the coordinate system in the Coord.System parameter.In this case,the Coord.System is set to UTM83-10.
Microstation DGN (V8) Reader Parameters
DGN Data Displayed in Data Inspector
The "ParcelLineLength" level in the DGN file contains text features that display the length of the nearest parcel line.The lines themselves are stored on the "ParcelLine" level.There are 3 steps involved in moving the text values onto the lines as attributes:
(2a) Separate Single Text Features from Multiple Text Features
(2b) Combine Multiple Text Features into One
(2c) Transfer Text Values Representing Line Length onto Parcel Lines
Some text features representing length are one feature (e.g."24.11"),whereas others are separated into contain multiple pieces of text (e.g."2" "4" "." "1" "1").The multiple pieces of text first need to be combined into one text feature.We use a StringLengthCalculator and Tester to separate the single pieces of text from the multiple pieces.
The multiple pieces of text (from the Passed port of Tester) are routed to a series of transformers which results in a single piece of text representing each line length::
This workspace writes using an Esri File Geodatabase (File Geodb Open API).The Writer parameter is set to "Yes" to Overwrite Existing Geodatabase to ensure any existing database is deleted before writing begins.
Output Esri File Geodatabase
The data used here originates from open data made available by theDistrict of North Vancouver.It contains information licensed under the Open Government License - North Vancouver.
Writing Microstation (DGN) Text Nodes with FME
GIS to CAD: Convert Parcel Polygons and Lines from Geodatabase to DGN
MicroStation Text Styles in FME 2015.1 and newer
Reading MicroStation (DGN) Tags with FME
How do I convert curved text from Geodatabase to Microstation DGN?
MicroStation Text Styles in FME 2015.0 and older
Handling MicroStation (DGN) Dimensions
Reading Basic Geodatabase Annotation - GDB to DGN
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