Re: Agawa Canyon Expedition - map help please -- Fortune Bay Expeditionary Team Campfire

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Subject: Re: Agawa Canyon Expedition - map help please

Author:
pathfinder

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Date Posted: 10:45:36 08/19/04 Thu
In reply to: Ken 's message, "Re: Agawa Canyon Expedition - map help please" on 01:45:15 08/19/04 Thu

Yeah, Yeah, Yeah.

Just giving you a hard time.

But, if you need an accurate map then I need to know what GIS and projection you would like. And it is a Reference Overlay not a Calibration. If you remember, it is impossible to have a perfect map, and calibration assumes there is a standard for 0.

And actually cut and paste is as accurate (if not more) as your method (remember the backtracks have waypoints), as long as you has the same projections (GPS and Software). Quite honestly, the GeoTIFF method you talk about only helps with copyright, the Softmap and Nat Geo meet USGS and Ministry standards for digital mapping, but you will have inaccuracy by scanning and pasting the for corners of a papermap.

So, what projection would you like for your map? Let me know if you need help with this concept;)

Pathfinder

>Well now I just can't help it if Mac users are savvier
>than Windows uers. Nope, can't help that at all.
>
>A GeoTIFF file has nothing to do with Macs per se.
>It's a TIFF file with geographic reference information
>in it. That information can be read by mapping
>software and so the software then knows where to plot
>information on top of the image of the map. A
>callibrated map is a map where geographical reference
>points are known. If you don't have such a map then
>you can't plot your tracks, waypoints, routes,
>whatnots, on top of the image.
>
>To callibrate a map you use whatever software you're
>using (assuming it lets you do this at all) and you
>tell it where known locations are. Usually you work
>with the corners and a central point, but good
>software will accept any valid information. The more
>points of reference you can provide the better. You
>also tell the software what datum to use, the scale,
>and so forth.
>
>So, yah, I can download GPS data with Nat Geo TOPO or
>other programs. I've done that, but if you really want
>to work with the data (the overlay) on a real map
>image (basemap) you need a calibrated map. Remember
>you can't really just paste a line, the track data, on
>top of some picture and hope things line up unless you
>match the "scale" of the picture and the data. With a
>calibrated map image that's done for you
>automatically. Then you can use your favorite mapping
>software and better plot routes, learn distances, and
>so on.
>
>Of course, if you don't really care about generating
>good maps then this is all moot. But you're an
>expeditioner, right..... ;-) You want to make nice
>maps....

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Replies:

Subject	Author	Date
Re: Agawa Canyon Expedition - map help please	Ken	16:34:18 08/19/04 Thu
Re: Agawa Canyon Expedition - map help please -- Pathfinder, 12:03:23 08/23/04 Mon