[postgis-users] electronic GIS data scale

[MarkW]

It might be helpful to think about intended uses of your data. You mention
different digitization methods - if you're concerned that these will impact
data use, then the methods could go in the metadata or somehow be encoded
with the data. If you digitized pond boundaries from aerial photos versus
satellite images, these are different scales - I don't know how you come up
with a precision for that (but the resolution would factor in), but I would
think knowing the digitization method would be helpful - i.e. in deciding
not to do areal calculations below a certain size, etc etc.

Mark

On Tue, Jan 6, 2009 at 8:57 AM, Kristian Thy <thy at 42.dk> wrote:

> On Tue, Jan 06, erik wrote:
>
> > This leads to my second question: is it pertinent to talk about scale
> with
> > electronic GIS vector data
>
> No.
>
> > and is *scale* the best way to express the
> > precision of the data given the different digitization methods used?
>
> Probably not.
>
> > Is there another way to express precision?
>
> I would use "accuracy in metres" (as in, the precision is +/- 5 metres).
>
> \\kristian
>
>
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