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Author Topic: GNIS to Globalmapper  (Read 2593 times)

Boyd

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GNIS to Globalmapper
« on: January 30, 2010, 07:34:05 PM »
I just "discovered" that Globalmapper can now directly open downloaded CSV GNIS .txt files. Is that a new feature in version 11, or did I just never notice it before? Either way, it sure makes things easier! You just go to the open file menu in Globalmapper and choose GNIS as the file type.  :)

Seldom

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Re: GNIS to Globalmapper
« Reply #1 on: January 30, 2010, 08:30:25 PM »
You've been able to do that since version 8.  Only problem is that the way GM reads it doesn't completely agree with MP_TYPE assignments.  So, in order to avoid lots of "unknown point type" warnings at the beginning of a cgpsmapper compile I import the GNIS file into Excel and use a vlookup table to assign the correct MP_TYPES.

Another problem with GNIS files is they change the format, column headers, column delineators, from time to time.  At least twice in the past three years.  IIRC the old spacer was a tab. Now it's a "|".
« Last Edit: January 31, 2010, 06:34:30 AM by seldom_sn »

Boyd

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Re: GNIS to Globalmapper
« Reply #2 on: February 01, 2010, 10:04:12 AM »
Well obviously I just wasn't paying attention with the old version  ;)  The trick is that you have to choose the GNIS option when you open the files I think. I know I tried opening them with version 9 and couldn't get it to work.

I found that it did a pretty good job with the PA data I downloaded the other day. There were some unknown point types, but that isn't an issue for me. I convert everything to either a generic dot or a custom MP_TYPE anyway - I hate the ugly standard symbols.