I verified what you are experiencing. Here is what I tried, and some
things I observed.
* The polygon can be queried with the "identify tool", but it is not
drawing the geometry correctly at scales smaller than 1:6.
* Reprojected the dataset to something more localized for Alaska (UTM
zone 6). Still got the odd shape.
* Extracted and drew only that polygon ("ID" = 3407) and still got
odd geometry.
* Converted the shapefile to a mapinfo file, and got the same odd geometry
* Verified that the data draws ok in other GIS software.
* Zooming in to a scale of 1:6, the polygon draws where it appears
white/empty at scales smaller than this.
* Imported into GRASS the single AK polygon which was extracted
previously with ogr2ogr. File imports into GRASS with the same odd
shape.
Maybe it is a bad shapefile, specifically along the northern edge of
Alaska, where the shape seems to "flip" about the northern boundary
line. I did downloaded and draw the 109th congress data file, and it
displayed the same erroneous shape; however, I wonder if 109 and 110
could be from the same geometry source, but contain different
attributes.
Interestingly enough, from the same webpage, I then downloaded the
1980 county boundaries shapefile (same projection), and QGIS drew
Alaska without any of those issues.
Not sure how much that really helps, but I tried.
Mark
On Feb 12, 2008 11:45 AM, <[EMAIL PROTECTED]> wrote:
>
>
>
>
> I have opened a shape file of the U.S. showing U.S. Congressional Districts.
> Alaska does not appear correctly in the Map View window of Quantum GIS. I
> have previously opened this file using ArcGIS without this problem. Here is
> the link to the file I'm using:
>
> http://nationalatlas.gov/atlasftp.html#cgd110p
>
>
>
> The title is "Congressional Districts of the United States - 110th Congress"
> and the zip file is cgd110p020.tar.gz.
>
>
>
> So, does anyone know why Alaska does not look right? I need to be able to
> work with this file as part of an important job assignment.
>
>
>
> My second question: How do I add a new field and populate it efficiently? I
> would like to add the voting results for a bill to the above shape file
> dataset. There are 1000's of features in this file, since there are many
> more land forms than there are districts. So efficiently putting in a "yea"
> or "nay" in the vote column is going to require a good method.
>
>
>
> As you can tell, I am a novice w/ GIS.
>
>
>
> Thanks,
>
>
>
> Roger
>
>
>
>
> _______________________________________________
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>
>
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