8. CAD to GIS CAD GIS Preserve attribution Data Improvement Create connectivity (snapping) Recover attribution from text or blocks Data Quality Layer / Level consistency Valid attributes Example
9. Introduction GIS is interactive Must be queried to get all the information. CAD is static Most information is visible, but link to geometry must be inferred. 5
10. Thank You! Questions? For more information: Mark Stoakes (mark.stoakes@safe.com) Safe Software
Editor's Notes
Many organizations are using both GIS and CAD systems. It’s important that we are able to move data smoothly between the two systems. Although there’s a great deal of overlap in functionality each has there strengths, in general: CAD users are focused on visual clarity and editing tools GIS users are focused on data models & data structuresA typical example is exporting GIS as-built features to a CAD design tool. Designing a new layout and then importing the new design back into the GIS.
This is what we’re going to demo.The requirements are the same as GIS to CAD – to preserve the meaning of the data in the different format. Issues with CAD is that the environment can be less stringent so entities may not be on the correct layer or have different attributes that represent the same information. Or different attributes values that mean the same thing: Phase = ABC and Phase = 123DEMOFor this example, we have a Microstation design file that contains road lines and lables for those roads. [open roads.dgn in Viewer]To successfully load the data into a GIS, we must attach the road label text to the road lines as attributes.The the problem is that labels may be close to several roads, so we have to use some logic to match the labels to the correct roads, and send any roads that don’t match a lable to a separate output for further investigation.
![CAD & GIS What’s important to CAD users? Visual clarity / Editing tools Symbology Labels & white space Dimensions What drives the GIS? Data structure / Data model Consistency Attribution / enumerated values Location Connectivity Analysis Example: GIS as-built CAD Design GIS Proposed What CAD Formats? ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)