[Manifold-l] Coordinate Weirdness

[jburn_gis at cogeco.ca]

I think you'll find that the problem is a "local offset" problem.  Often (I won't get into why) raster images are
projected, and then offset to put them in the "right spot".  If this *is* the case, then you should just have to
"change" the projection of the component to whatever you want, but just make sure that the check box for keeping local
values (bottom of the change projection box) is not checked.  You should see no actual change on the screen, but if you
check your X(I)/Y(I) values, you'll see that they're probably different.

Hope that helps.


>
>
>
> Hello Wizards:
>
>          I have an ECW image and several drawings, all NAD83, UTM 10N.  The
> ECW was sent me georegistered and all drawings were referenced to it.  I
> have generated several export files (shp, dxf) from my drawings which the
> client cannot load properly (project).  I have discovered the following
> upon importing my own exports:
>     * files imported with the XML file available import with the correct
> projection and datum.
>     * files imported without the XML file and assigned NAD83/UTM "manually"
> are not projected correctly.
>     * changing the projection to Lat/Lon has no effect.
>     * the wrong coordinates are in the range of -500 to 16,000.
>          I don't believe I've ever seen the likes of this and am hard
> pressed to guess what might be wonky.  I may have overlooked something
> simple.  This is the latest Manifold release.
>
>          I've appended the XML file for reference for those who may be
> familiar with the content.
>
>          Any thoughts would be appreciated . . . .
>
> <?xml version="1.0" encoding="UTF-8"?>
> <data>
>          <coordinateSystem>
>                  <name>Universal Transverse Mercator - Zone 10 (N)</name>
>                  <datum>North American 1983 (mean for CONUS)</datum>
>                  <system>Transverse Mercator</system>
>                  <unit>Meter</unit>
>                  <majorAxis>6.378137000000000000000000e+006</majorAxis>
>                  <eccentricity>8.181919104281579200000000e-002</eccentricity>
>                  <centerX>0.000000000000000000000000e+000</centerX>
>                  <centerY>0.000000000000000000000000e+000</centerY>
>                  <centerZ>0.000000000000000000000000e+000</centerZ>
>                  <rotationX>0.000000000000000000000000e+000</rotationX>
>                  <rotationY>0.000000000000000000000000e+000</rotationY>
>                  <rotationZ>0.000000000000000000000000e+000</rotationZ>
>                  <scaleAdjustment>0.000000000000000000000000e+000</scaleAdjustment>
>                  <scaleX>9.996000000000000400000000e-001</scaleX>
>                  <localScaleX>1.000000000000000100000000e-001</localScaleX>
>                  <scaleY>9.996000000000000400000000e-001</scaleY>
>                  <localScaleY>1.000000000000000100000000e-001</localScaleY>
>                  <falseEasting>5.000000000000000000000000e+005</falseEasting>
>                  <localOffsetX>4.675800000000000000000000e+005</localOffsetX>
>                  <falseNorthing>0.000000000000000000000000e+000</falseNorthing>
>                  <localOffsetY>5.389200000000000000000000e+006</localOffsetY>
>                  <centerLat>0.000000000000000000000000e+000</centerLat>
>                  <centerLon>-1.230000000000000000000000e+002</centerLon>
>          </coordinateSystem>
> </data>
>
>
>                             Spring Harrison
>                                        Stellar GPS & Mapping
>                                  103 - 9800 McDonald Park Road
>                                         Sidney, B. C. Canada
>
>
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--------------
James Burn AScT