[UW-GIS-L] lat long points not visible on map

Sun Nov 23 23:21:10 PST 2003

    Yes indeed.  I think her source DRGs might be the best source for that
info!
    I forgot about that one...
    Keven

----- Original Message ----- 
From: "Rebecca Handcock" <rebeccah at u.washington.edu>
To: "UW - GIS Discussion & Support" <uw-gis-l at u.washington.edu>
Sent: Sunday, November 23, 2003 10:03 PM
Subject: Re: [UW-GIS-L] lat long points not visible on map


>
> Also double check that you have the right UTM zone specified. I have
> imported USGS DEM quads before, and there are several UTM zones in
> Washington State. Sometimes I forget and wonder why all of my Seattle data
> is in Greenland.
>
> Thanks
> Rebecca
>
> ---------------------------------------------------------------------
> Rebecca Handcock Ph.D.                             Research Associate
> Dept. of Earth and Space Sciences
> University of Washington                    RebeccaH at u.washington.edu
> Seattle, WA 98195-1310        http://faculty.washington.edu/rebeccah/
>
> On Fri, 21 Nov 2003, Phil Hurvitz wrote:
>
> > You need to be absolutely certain what your original projection
parameters
> > of your points are before you do anything else.  NAD27 and WGS84 are
only
> > datums, and thus are only 1 of the many projection parameters you need
to
> > be certain of.
> >
> > -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 Fri, 21 Nov 2003, Sacha Vignieri wrote:
> >
> > > Hi Phil,
> > > Thanks for getting back to me, and sorry to bother you again, but I am
> > > still having trouble. I've reprojected the points into the projection
of
> > > the map (NAD27) and the map into the projection of the points (WSG84).
I
> > > also tried reprojecting both into other projections. In both cases
with
> > > no luck. I also tried adding the points in ArcView 3.2, in that case I
> > > couldn't even zoom to them as a theme.
> > >
> > > It seems that it should be so simple...
> > >
> > > Any other ideas? I am the lone GIS user in my department and so am
> > > pretty isolated.
> > >
> > > Thanks so much for the help!
> > > Sacha
> > >
> > > Phil Hurvitz wrote:
> > >
> > > > Sacha, you probably have defined your prj incorrectly.  Make sure
your prj
> > > > for your points matches the actual data.  If you know the projection
> > > > parameters for your points, I suggest projecting the data set to a
new
> > > > data set stored in the same projection as the other data you want to
use.
> > > >
> > > > In addition, sometimes ArcMap attempts to be too smart for its own
good,
> > > > by reading the GeoTIFF headers embedded in images; even when you
change
> > > > the .prj for e GeoTIFF, the embedded parameters override the prj or
tfw.
> > > >
> > > > I also suggest viewing your data in ArcView 3.x, which lacks the
ability
> > > > to read GeoTIFF headers, and can't project vector and raster data
> > > > simultaneously on the fly, and can't read .prj files for display
purposes.
> > > >
> > > > -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 Fri, 21 Nov 2003, Sacha Vignieri wrote:
> > > >
> > > >
> > > >>Hi,
> > > >>I am a relatively new user of ArcGIS, although I did take a course
in
> > > >>ArcView a few years ago. I am having a problem getting lat long
points
> > > >>to appear on my map. The map is a mosaic of several USGS DEM quad
maps
> > > >>that has been texturized with DRG data that I purchased online at
> > > >>MapMart, it is in a NAD 27 projection. The points are sample
locations
> > > >>in Lat Long that I collected with a GPS unit. I have been working in
> > > >>ArcMap, and am able to successfully add the table and describe the
> > > >>projection used (by selecting the .prj file I was given with the
maps).
> > > >>When I add the points however, they do not appear on the map. They
are
> > > >>listed first in the table of contents, so they are not hidden. Also,
> > > >>when I select zoom to event I am able to see some of them (not all),
but
> > > >>not in the same area as the map. I know that the lat longs are
correct,
> > > >>and should overlap with the map.
> > > >>
> > > >>Any insight would be GREATLY appreciated, I have been struggling for
days.
> > > >>
> > > >>Thanks for your time!
> > > >>Sacha Vignieri
> > > >>Department of Biology
> > > >>University of Washington
> > > >>Seattle,WA
> > > >>sachav at u.washington.edu
> > > >>
> > > >>_______________________________________________
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> > > >>Uw-gis-l at u.washington.edu
> > > >>http://mailman.u.washington.edu/mailman/listinfo/uw-gis-l
> > > >>
> > > >
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