Overlaying vectors on raster

[Stephen Woodbridge]

It is easy to set the output projection to to that of you images and add
the same to all the image layers, then you can set the tiger layers to
have a different projection block. This will only cause the vector
layers to be reprojected.

I get pretty good registration between GPS tracks in the north-east and
tiger data without the need for any projection and the GPS is returning
data in WGS84 and the TIGER data is in NAD83 See here:
   http://swoodbridge.com/moto/

Tiger data was collect in different ways in different areas. There are
some areas the that have poor registration and other with good. Check an
area in the north-east and see how it lines up. Tiger is going through a
modernization program and will be making a lot of updates over the next
few years so it will be ready for the 2010 census.

-Steve W


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
>