[Xastir] Georeferencing shapefiles.

[Gerry Creager N5JXS]

I'm awake, I'm awake...

Rusheeting of data is problemmatical.  It can be done but it's not 
straightforward.  If I can find my Microstation software... and remember 
how to load it into XP... (yes, I keep a throw-down XP box around for 
some of this stuff)... I might be able to rubber sheet it *if* you could 
identify 5-7 points on the ground, that correspond to identifiable 
points you can gain coordinates on.  Rubber sheeting really is easier 
with raster data, and is now frowned upon in the GIS world for vector data.

gerry

Curt Mills wrote:
> On Mon, 20 Dec 2004, James Ewen wrote:
> 
> 
>>So, here I sit with a problem on my hands.
>>
>>I have been able to determine that the shapefiles I have are not tied to
>>anywhere upon the face of the earth.
>>
>>
>>>The original "Blackfoot" files were created as dgn files (Microstation)
>>>by another person, without being geo-referenced. I imported them into
>>>shapefile format. The shapefiles are not georeferenced.
>>
>>I guess that if shapefiles can be created using 'relative' coordinates,
>>there must be a way to tie them to a 'real world' location. I just need to
>>figure out how to do that!
> 
> 
> The first thing I'd ask is:  Are they to scale?  If not, they might
> not be worth the bits they're written on.  Then again, they might
> be better than the Tiger/Line stuff we have down here, hi hi.
> 
> There's such a thing as rubber-sheeting software, that can morph a
> set of data into a new system of coordinates.  If your data is to
> scale and you can find some reference points for it, you might be
> able to go that route and get something useful.
> 
> I suspect Gerry C. will have something to say about it.  I wonder if
> he's awake yet?
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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