[UW-GIS-L] Trouble with projections

[Phil Hurvitz]

Because ArcMap attempts to be so smart about dealing with projections, I
suggest loading both data sets into ArcView.  If they don't line up, then
you know for sure that they are in different projections.  Mainly I've had
this issue with images, as GeoTIFF have internal headers, while other
files can have .aux, .tfw, .hdr, that can all confuse ArcMap.  Make sure
you don't have a projection defined for the data frame as well, as this
can make ArcMap confuse itself.

-P.

******************************************************************************
Phil Hurvitz, MFR | GIS Specialist | College of Forest Resources | 355 Bloedel
Box 352100 | University of Washington, Seattle, Washington  98195-2100, USA
 tel: 206.685.8179 | FAX: 206.685.3091 | e-mail: phurvitz at u.washington.edu
             WWW: http://gis.washington.edu/phurvitz
******************************************************************************

On Wed, 8 Jan 2003, David Finlayson wrote:

> Can you display the 1980 shapefile in Arcmap?
>
> --
> David Finlayson
> dfinlays at u.washington.edu
> Geomorphologist and GIS Specialist
> NearPRISM - Puget Sound Nearshore Research Group
> University of Washington, Seattle
> (206) 543-7229
>
> On Wed, 8 Jan 2003, Aimee A. Pierce wrote:
>
> > Hello,
> >
> > I'm the new GIS assistant at the Map Library in Suzzallo just arrived this January, currently a Senior in Geography program.  I've already come across a problem that has stumped me!  A patron came in with 1990 and 1980 census tract shapefiles for King County that Jenny Stone, the previous Head of the Map Library had given her awhile back.  The 1980 shapefile's coordinate system is GCS Assumed Geographic 1, the datum D North American 1927 and the spheroid Clarke 1886.  The 1990 shapefile is unprojected.  I have tried using ArcCatalog and ArcToolbox to import the coordinate system of the 1980 shapefile, but that didn't work.  I have also tried reprojecting them both into a new coordinate system all together.  I have made sure the map units are the same as well.  I would appreciate any suggestions.
> >
> > Thanks!
> > Aimee
> >
> > Aimee A. Pierce
> > GIS Assistant, Map Library
> > University of Washington
> > aimeeap at u.washington.edu
> > 206.543.9392
> >
>
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