This is what metadata is for. If a vendor's data doesn't include
it, then the data's probably not worth very much. Metadata is
"data about data", and it includes information about accuracy,
resolution, sources, processing performed and so on. The
information should be sufficient for you to make a reliable
estimate of the data's suitability to your needs. MapInfo
provides support for metadata, and data products like StreetWorks
and some others come with it. Unfortunately, there's precious
little info about metadata in the MapInfo manuals, but there's
lots more on the subject at:
http://www.fgdc.gov/metadata/metadata.html. There's also a couple
of freeware utilities (metadata.zip and Compass.zip) at the
MapInfo-L FTP site.
- Bill Thoen
Derek Wilson wrote:
> Hi, does anyone have any warnings, comments or concerns
> regarding data purchased from a vendor. The last postal code
> point file I purchased had numerous duplications of lat and
> long values and a number of points were simply not in the right
> location. When I contacted the vendor to complain, they tried
> to downplay the inaccuracies.
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