Overlaying vectors on raster

[Gerry Creager N5JXS]

It has the appearance of a datum shift.  There's precious little
difference for street overlays between NAD83 and WGS84 datums.  So what
if you were to declare the Tiger data NAD27 (EPSG 4267)?

An idea of where, geographically, the image and vector data are from
would help in calculating the datum shift.

gerry

Randy Page wrote:
> Hi All,
>
> I’m working with Tiger data in the standard old geographic non-projection,
> and am attempting to overlay streets on top of aerials pulled in via WGS
> from USGS.    The problem I am having is that the streets are WAY off in
> every location I try.   I realize the Tiger data is not terribly accurate,
> but I have seen others do a much better job of overlaying the data.   The
> aerials I am requesting are in EPSG 4326 (which is I believe WGS84
> geographic) while the Tiger data is in EPSG 4269 (which is I believe NAD83
> geographic.)   I wouldn’t think the datum would make that much of a
> difference.
>
> The link below is to an example map that shows how far off the streets are:
>
> http://viewer.terraverge.net/viewer_mi/maps/sample.jpg
>
> Any ideas or suggestions?
>
> Thanks,
>
> Randy

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