Crossing UTM zone or boundaries

We’re in UTM zone 14N here, so all our mapping is based on that. We do some soil samples that spill over into Zone 15N, which throws everything off. Here’s what I did to convert from 15 to 14. This doubtless introduced some inaccuracy, but it should be close enough for Tone Ag purposes.
1. In Mapsource, change the coordinate system to decimal degrees (lat/lon hddd.ddddd), export points, close Mapsource
2. Open the resulting text file in Excel, strip out redundant columns (leave only position, elevation), save as tab delimited txt, close Excel
3. Open the resulting text file in your favorite text editor, search and replace ft with nothing, search and replace N with nothing, search and replace (space)W with (tab)-, save and close
4. Open the resulting text file in Excel, insert two columns filled with 1 before elevation, swap lat/long columns, save as txt, close Excel
5. Run my coordshift.pl program on the resulting text file

Alternate method
1. In Mapsource, change the coordinate system to decimal degrees (lat/lon hddd.ddddd), export points, close Mapsource
2. Open the resulting text file in your favorite text editor, search and replace N with nothing, search and replace (space)W with (tab)-, add (tab)position_w header after position header, save and close
3. Open the resulting text file in Excel, save as dbf, close Excel
4. In ArcView, add dbf as event theme in a lat/long view, convert theme to shapefile, close ArcView
5. Use ESRI projection utility to convert shapefile from degrees to zone nad_83_14N
6. In ArcView, add new shapefile

Usual disclaimers – don’t use this in any environment where precision is at all important, I take no responsibility, use at own risk, blah, blah, blah.

You might want to look at this article on crossing UTM zone boundaries.

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