[OSM-talk] Tiger 2007 Data

[Andy Allan]

On Mon, Oct 20, 2008 at 9:44 PM, vegard <vegard at engen.priv.no> wrote:
> On Mon, Oct 20, 2008 at 12:27:27PM -0700, Dave Hansen wrote:
>> On Mon, 2008-10-20 at 09:43 +0200, vegard wrote:
>> >
>> > I see it like this: What could be very useful to have, is a mapping
>> > between tiger data (old set) and OSM data. It could be to late for this
>> > round, but an external_id:tiger = XXXX that you'd *never* remove, is a
>> > good thing. That'll help when updating.
>>
>> Umm.  We have this.  It's called a tlid, and it's already in the data
>> set.  When TIGER objects got combined into a single OSM object, I
>> preserved this tag.  I *also* submitted patches to JOSM to preserve this
>> tag when merging points and ways.
>>
>
> Good! I swear, I did mean to write "you might already have this,
> but...".

It would have taken two minutes to check.

> Well, rest of conversion depends: Is there a (relatively) easy way to do a diff
> between the old set and the new set? It'd be good to know what is the
> changes introduced by the new set. The size/amount of those changes will
> decide the strategy for rest, no?

These are simple questions that everyone knows need asking - maybe you
could do some research and come back with the answers?

Cheers,
Andy