On 6/15/07, brian grant <[EMAIL PROTECTED]> wrote:
> What is 'contemptible' about lat/lon?
it's lousy for assigning attributes to an area; more than adequate for
determining what area is under measurement.
It occurs to me that you are looking for an alternate system because
you are not using tools that understand geometries. Take a look at
the PostGIS documentation dicusion of GIS objects:
http://postgis.refractions.net/docs/ch04.html#RefObject
> I am still confused as to what is wrong with tracking the location of
> your sensor notes using lat/lon. What is the problem with lat/lon?
identifying their location with lat/lon is OK - it's storing the resulting
data attributable to a defined area where lat/lon becomes troublesome.
I don't think you want to store your data 'attributable to a defined
area.' You want to be able to analyze and present your data by
defined areas...
> What is so attractive to you about losing resolution?
I'm not losing resolution. in fact, I'm incorporating the precision of the
location measurement into the area defined.
huh? It looks like you are applying a non-reversible transformation
to your initial point data. Arguably, because of GPS accuracy, your
original point data is really an area of probability-you have a 95%
(or whatever) chance that your true position is within x meters of the
GPS reported position...
So either you have a point location, or a circular area, and you are
applying a transformation to change that point, or circle, into a
triangle. And you can't reverse that transformation, plus you don't
have any real certainty that your actual position is within the
resulting triangle.
also, the mesh I'm suggesting has a direct correlation to lat/lon.
it has to - it's how we measure location.
my point is that our method for measurement doesn't have to be how we store
data.
But nor does your method of storing data need to be how you present the data.
cheers,
Rich
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