[Xastir] Re: USGS DRG files no longer free.. (Tyler Allison)

[Jerry Chamberlin]

That did it, I did find the end of the earth.......


On Mon, 6 Oct 2003, Curt Mills, WE7U wrote:

> On Mon, 6 Oct 2003, Tyler Allison wrote:
> 
> > True. That's what I get.
> >
> > Im not trying to be a tard really. I just dont see how 121.20692W turns
> > into -121. Shouldnt the line be -121.20692 or can you simply drop the
> > decimal section when building a fdg file from hand?
> 
> Sorry.  W = -
>         E = +
>         S = -
>         N = +
> 
> So 121.20692W = -121.20692
> 
> 
> > How do I know which number to use as the east/south/west/north boundaries?
> > The listgeo file has two numbers listed for things like 'lower left' or
> > 'upper right' which obviously isnt east or south ;)
> 
> Pick the average?
> 
> 
> > Right now Im just sorta looking at the 'working' geotif files and saying...
> >
> > Well the second number on the third line of that listgeo was a 121 and the
> > fdg for east boundary is 121 so I must need to take the third line of my
> > listgeo output and make it my east boundary.  I have no idea what it all
> > means Im just faking it ;)  I'd prefer to understand what Im doing instead
> > of "take the third number, drop the decimal and make it the East boundary"
> 
> The problem is that the projection used for the USGS DRG maps is the
> UTM projection.  We're not using that in Xastir.  I'd take the
> average of the values and that'll get you so close you won't care.
> So, for the two west values, average them.  Same for the two north
> values, the two south values, and the two east values.  That'll give
> you four values to use for the boundaries.
> 
> -- 
> Curt Mills, WE7U                    hacker_NO_SPAM_ at tc.fluke.com
> Senior Methods Engineer/SysAdmin
> "Lotto:    A tax on people who are bad at math!"
> "Windows:  Microsoft's tax on computer illiterates!" -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
> 
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