Not knowing where you bought your quads I would asnwer your question this
way.
The quads I have bought from both SureMap and LandInfo come fully
registered. I stopped using SureMaps and went with LandInfo as they have
been nominated by the USGS in some sort of special distribution realionship.
They can service you with CD(s) in three to six days normally.
LandInfo upon ordeing asks you a couple of questions concerning projection
and the like. I would go for the highest resolution (dpi) in trade for
color info - these maps are only five or six color anyway so four bit color
is OK. The files are in geoTIFF and they gratis a nifty utility known as
WorldReg that converts geoTIFF to TAB. Edge mapping in my experiece of now
four different sets of four to get the those "golden centers" suggests their
registrations are pretty spot on. Line match on teh edges is naother thing
and the quality varies. I have used other tools to build a single image of
the central 4-corners region so that four images didn't have to be loaded.
This requires re-registration and locks you to NAD27, UTM, or State Plane.
MapInfo by design uses the most visible of the images to dominate the afine
presentation. There is a company in Boulder that Bill Thoen can put you
intouch with that can give you a very nice shaded relief of the same maps.
You'll need to invest in the DEM files as well. Ask LandInfo about this and
I am prettry they will direct you in the proper direction. Otherwise drop a
note to Bill.
MidNight Mapper
aka Neil
3/25/99
-----Original Message-----
From: Uhl, Philip/SLC <[EMAIL PROTECTED]>
To: '[EMAIL PROTECTED]' <[EMAIL PROTECTED]>
Date: Wednesday, March 24, 1999 1:01 PM
Subject: MI PRO: Tiling DRGs
>Hi,
>
>I'm venturing into new territory. I have a project which needs to use USGS
>7.5' Quads (DRGs). The area of interest falls on the intersection of four
>different quads.
>
>Questions:
>
>Has anyone compiled notes on working with these TIF images? Specifically
>tiling them in a workspace? When you open them in MI aren't they
>automatically placed in the correct geographic position? How do you deal
>with overlap?
>
>Is the "collar information" the title block, scale, credits and stuff
around
>the outside of the map in the tif image? How do I get rid of it so the
maps
>will fit together neatly; or do I even need to worry about it? One report
>from the archives said that if you cut off the outside info in PhotoShop
you
>also lose the georeferencing.
>
>Does anyone know of a website where you can download quads of Colorado?
>
>Thanks for the help.
>
>Phil Uhl
>Salt Lake City
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