Mike Dobson of Telemapics:
Perhaps Apple is not aware that data quality is a topic that professional map makers and GIS professionals know a lot about. In more formal terms, the problems that Apple is facing are these:
Completeness – Features are absent and some features that are included seem to have erroneous attributes and relationships. I suspect that as the reporting goes on, we will find they Apple has not only omissions in their data, but also errors of commission where the same feature is represented more than once (usually due to duplication by multiple data providers).
Logical Consistency – the degree of adherence to logical rules of data structure, attribution and relationships. There are a number of sins included here, but the ones that appear to be most vexing to Apple are compliance to the rules of conceptual schema and the correctness of the topological characteristics of a data set. An example of this could be having a store’s name, street number and street name correct, but mapping it in the wrong place (town).
Positional Accuracy – is considered the closeness of a coordinate value to values accepted as being true.
Temporal Accuracy – particularly in respect to temporal validity – are the features that they map still in existence today?
Thematic Accuracy – particularly in respect to non-quantitative attribute correctness and classification correctness.
Dobson gives a great overview of what he thinks are the problems with Apple’s approach to mapping. While Dobson thinks it can be fixed, the downside is it looks like it’s going to take a massive effort. Dobson concludes:
There is no really quick fix for Apple’s problems in this area, but this should not be news to anyone who is familiar with mapping and the large scale integration of data that has a spatial component.
Of course there appears nowhere to go but up for Apple in mapping. I wish them the greatest of success and suggest that they review this blog for numerous topics that will be of assistance to them.
Fascinating read. I highly recommend checking out the whole article.