[Xastir] manually generated tiger map problem

[Matt Werner]

Why not just download the ready-made files from esri.com?

>I'm trying to generate some tiger maps to use when an internet  
>connection is not available.  I fired up the sniffer, extracted the  
>tiger URL that xastir generates, and wrote a little perl script to  
>generate the URLs and (I think) matching .geo files.  Here is a sample  
>URL and .geo file:
>
>/usr/local/bin/wget --output-document=t_00.gif  
>"http://tiger.census.gov/cgi-bin/mapper/map.gif? 
>&on=GRID&on=counties&on=CITIES&on=places&on=majroads&on=railroad&off=sta 
>tes&on=interstate&on=ushwy&on=statehwy&on=water&on=shorelin&on=miscell&l 
>at=34.05&lon=-86.95&wid=0.1&ht=0.1&iwd=1000&iht=1000"
>
>FILENAME t_00.gif
>TIEPOINT 0 0 -87.0 34.1
>TIEPOINT 999 999 -86.9 34.0
>IMAGESIZE 1000 1000
>
>My problem is that the vertical edges of the maps are off by quite a  
>bit.  For the maps that are 0.1 degree square, points that should be on  
>the left and right edges are 0.01 (10%) toward the center of the map.   
>I have tried square maps from 7.5 minutes to 1 degree square with the  
>same results.
>
>The horizontal edges match perfectly.
>
>Is there some mapping magic I don't understand here, or is my .geo file  
>wrong, or what?
>
>The tiger maps that xastir generates are, of course, pretty much  
>perfect.  The reason I'm not using snapshots as someone suggested  
>yesterday is that I need hundreds of them to get the detail I want, and  
>copying that many snapshot files is too much effort.
>
>thanks,
>Jason
>kg4wsv
>----------------------------------------
>Jason Winningham
>Computer Systems Engineer
>College of Engineering
>The University of Alabama in Huntsville
>http://support.eng.uah.edu/	http://www.eng.uah.edu/~jdw
>
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