How is the data
Verified?
We match similar data from multiple sources to isolate and
correct irregularities.
Different organisations record information at different
stages in the life of a property, and by cross matching
their data, we have been able to identify potential errors,
and correct them.
Missing information can be worse than incorrect
information sometimes, because you may not be aware something
is missing. Where information such as "Who owns this
property" is missing, we normally complete the picture.
LINZ will confidently tell you who owns a title, because after
all, they are the authorative source, but they can only
connect it to the Survey System 78% of the time. This means
they can only draw it on a map 78% of the time. We can do this
98%, which is the best match in the country.
In other cases, we enable you to verify the data yourself.
An example of this is where we report the sale information of
a given property from REINZ, the Local Authority or Headway
Systems in the same report. If the sale data matches, you know
you can trust it. Our match to REINZ data is 94% which
is the best in the country. This allows you to recognise when
data entry errors have occurred, and avoid using incorrect
data.
We also run a lot of sanity checks on data to make sure it
is reasonable. The first time we ran these checks, we
discovered over 20,000 properties that others have
matched to the wrong title/owner.
