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Good info, thanks!

I had a lake map that I scanned into a .pdf at three resolutions, 300, 350 and 400 dpi, which corresponds to about 11, 10 and 8.5 feet per pixel.  The file sizes were 860, 940 and 1140 k, respectively.

Do the raw file sizes matter with your program and/or installing them on the gpsr once they're chopped up and spit out?  Sorry if I'm asking stupid questions but this is all pretty new to me.  I haven't had time to download g-raster yet, but I plan on doing it these next couple of days...hopefully I'll get a better idea of how to do this stuff.

Thanks,

Jason

Thanks for the reply!

The lakemap in question is available at the MN DNR website as either a pdf or tif file, and is about 140k or so.  I also have a scannable copy of the map, which I haven't done yet but still may.  Maybe I'd get better resolution if scanned it, but then I suppose you're at the mercy of your scanner's performance?  If I scanned it at the highest resolution possible, would that help my cause?

I'll give g-Raster a try--looks easy to use, and I wouldn't mind paying for the registered version.  I read through the limitations of the freeware version: do you think I'd be able to get a pretty good idea of its functionality before buying?  I saw the 1500x1500 pixel limits on kmz files and 2000x2000 pixel limits on gpdf to gtiff conversion and wondered if I'd be able to at least clearly see what it does before purchase...

Jason

Hey all,

Thanks for this site:  you all are really good at what you do!

After not being able to figure out how to make the "MN Lake Depths" work that's posted on this site (apparently no one can figure it out?) I decided to follow the instructions for using Google Earth to make my own.  I downloaded a jpeg image of a lake (with contours) from the MN DNR website and all went well...it appeared in basemap and I was able to view all areas, mark waypoints, zoom to see individual contours, and it loaded perfectly into my 62sc.

However, when I attempted to zoom in on my unit in order to navigate to a certain depth, I discovered that the resolution leaves something to be desired.  When making the map, some trial and error showed me that the size of the image can't exceed something like 3mb (?), and I pushed it right up to that limit.  Is there some method of increasing resolution on a map like this that would allow me to zoom and be able to at least somewhat see lake depth contours?

Thanks in advance,

Jason

p.s.  I'm a GPS noob, so be nice