- Clients, usually from one group or the other, are accustom to very specific symbols for specific map features.
- All of the historic maps from either side have had consistent symbology that match said clients preferences.
- The two groups symbology clashes - what is the red line; a 70kv line, water main, or a user annotation from someone in the field?
- The extents of the features clash.
- A lot of features are not loosely coupled: there are groups where if something is not present it makes no sense, or applications that may require it fail.
- The labeling becomes very problematic for the same reasons symbols do.
- Definitions! What does "deactivated" mean exactly across very different features in different groups?
- There are a truly massive number of features. So many that a given client is not necessarily going to know what they really need.
- How do you project it? The scales of the datasets vary immensely.
- What coordinate system - clients have different preferences in this matter, and one has a custom one of their own creation.
Wednesday, May 13, 2009
The company I work for is both a water and power utility. Both sides have their own geographic information systems, with parts of IT trying to integrate both systems into one big GIS database. While there are complications on the technical end, let me try to describe some of the issues on such an integration from a cartographic perspective: