NewCAD is said to have a coordinate system that’s going to be written and read properly. A CAD file could be shifted by plopping down a coordinate system and a world file, then the feature manipulation engine (FME) would pick it up. Yes, there is always the option of tricking the local coordinate systems as everyone did early on, inspired by ESRI. Even back in the days of MapInfo, people realized that not having a coordinate system at all was a problem. Migration and the lack of coordinate system in CADĪ missing coordinate system is a menace, really. If an organization prefers to go down the CAD route, it can do so with the help of these newer developments focusing on stricter specs. NewCAD now has certain GIS elements, a little bit like Bentley’s XFM that stores rich attribution with drawing elements such as AutoCAD map or Civil 3D, providing structure. This opened up a new market for CAD add-on tools that enforce specifications, resulting in tighter data models. More recently, systems like Maximo and IBM require CAD standards as well as CAD files to conform. Rules are often interpreted and enforced differently depending on how rigorous the mindset of the users or the organization is. Doing this can reduce 800 variations of the layer names down to 30, so that the translation can take place. In the case of our misnamed streets, once the different names you encountered are collected and put in an Excel sheet, someone can manually go through the list and group them.
Anything that doesn’t match the specs is handed over to a technician for cleaning up. Colors, line styles, levels, and layer names. During the transformation from CAD to GIS, you read the CAD file and check against a spreadsheet of what’s standard and should be allowed. Once you scan a thousand CAD files, you’ll see how people just named things on the whim. A street can be labeled as a boulevard as well as a road. Even if users followed CAD specifications, they probably applied them loosely.
It would be hard to go rogue and abuse it.ĬAD technicians, on the other hand, can apply their artistic license and suggest how it should be used and design anything they want.īased on the fundamental differences, data migration between the two can be a nightmare. It’s data management with precise specifications and schemas defined. An early CAD file amphibian or a GIS mammal? Dale Lutz, co-founder, Safe Software explains how the two compare, who the new kid on the mapping block is, and where his allegiance lies.
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