newb - calc'ing geotiff world file internals

[Mike D'Ambrogia]

You know, I could just get std USGS topo maps of the same area and build
the tiles off the topo maps, would that make the projection calc easier?

Mike

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Mike D'Ambrogia
Sent: Sunday, May 08, 2005 8:56 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] newb - calc'ing geotiff world file
internals


Ed,

Thanks for the response

Was thinking about this while driving around awhile ago, if I know the
UTM or lat/long of each corner of each image couldn't I determine the
distance across the map in meters or feet and then divide that by 673 to
get pixel X value?  And then do the same for the top to bottom of each
image and divide by 795 to come up with a pixel Y unit value?

>>You can relax things a bit if you're simply trying to display the
data. If you
>>don't really care about coordinates, AND if you don't intend to
integrate other
>>data sets with this one, you can just make things up.

I do want to map data to coordinates, but I think I'll roll right now
with your logic below just to see if I can get the raster data into the
system and have it display correctly.  Something to build on in the
meanwhile

Thanks for the reply

Mike