Terraservice data not aligning

[Stephen Woodbridge]

Camden,

Tiger data is known to have varying accuracy from county to county.
Sometimes the data is very closely aligned but in some areas it can be
grossly off. The Census is spending $200 Million to improve the quality
and accuracy of there data. See http://www.census.gov/geo/mod/maftiger.html
The first changes from this project will be getting release in Q1'05 and
will be getting rolled out twice a year over the next few years until
the project is done.

Until then we all have to live with it as it is or license commercial
data which is typically very expensive.

-Steve W.
  http://imaptools.com/

Camden Daily wrote:
> Hello all.  I've got a layer in my map file that I'm grabbing from
> terraservice, and it's mostly working great.  However, when I overlay
> some Tiger/Line street data over the terraserver image, things aren't
> quite lining up.  It's very, very close, but just slightly offset when
> zoomed in (maybe by 20-50 feet).
>
> My map file, the terraservice layer, and the tiger/line data are all
> projected as EPSG:4326, so I don't think it's a projection issue.  Has
> anyone else experienced any issues mixing these two data sets?
>
> Is it possible to 'tweak' a layer so that it's offset by a short
> distance?  I know about the 'offset' parameters for styles, but those
> only take units of pixels (which will look good at some zoom levels,
> but not others...)  I'd be grateful for any suggestions.
>
> -Camden Daily
>
> terraserver layer:
>
>   LAYER
>     NAME "aerial"
>     TYPE RASTER
>     STATUS OFF
>     MINSCALE 1000 # trying to grab too small a scale might result in
> an error from terraservice
>     CONNECTIONTYPE WMS
>     CONNECTION
> "http://terraservice.net/ogcmap.ashx?VERSION=1.1.1&SERVICE=wms&LAYERS=urbanarea&FORMAT=image/jpeg&STYLES="
>     METADATA
>      "wms_srs" "EPSG:4326"
>     END
>     PROJECTION
>       "init=epsg:4326"
>     END
>   END
>
> tiger/line layer:
>
>   LAYER
>     NAME "aerial_road_small_near"
>     TYPE LINE
>     STATUS OFF
>     DATA "tgr17031lkA"
>     MAXSCALE 100000
>     CLASSITEM "CFCC2"
>     CLASS
>       EXPRESSION /A4|A5|A6|A7/
>       COLOR 150 150 150
>     END
>     PROJECTION
>       "init=epsg:4326"
>     END
>   END
>