Comments on: Thematic Polygon Shapefile Display In Google Maps http://freegeographytools.com/2007/thematic-polygon-shapefile-display-in-google-maps Exploring the world of free tools for GIS, GPS, Google Earth, neogeography, and more. Wed, 18 Nov 2009 03:05:04 -0700 http://wordpress.org/?v=2.8.6 hourly 1 By: Leszek Pawlowicz http://freegeographytools.com/2007/thematic-polygon-shapefile-display-in-google-maps/comment-page-1#comment-407 Leszek Pawlowicz Sun, 01 Nov 2009 01:04:16 +0000 http://freegeographytools.com/?p=119#comment-407 I'm guessing that your shapefile doesn't have a numeric field, e.g. one describing population, growth rate, etc., and the GMapCreator requires at least one. By opening the shapefile's DBF file and adding a field with numbers, you could get around that; for example, creating a column of numbers representing the district number. I’m guessing that your shapefile doesn’t have a numeric field, e.g. one describing population, growth rate, etc., and the GMapCreator requires at least one. By opening the shapefile’s DBF file and adding a field with numbers, you could get around that; for example, creating a column of numbers representing the district number.

]]> By: Devin http://freegeographytools.com/2007/thematic-polygon-shapefile-display-in-google-maps/comment-page-1#comment-406 Devin Sun, 01 Nov 2009 00:12:48 +0000 http://freegeographytools.com/?p=119#comment-406 Could you explain this a little better? "2. A thematic variable you can plot that is numeric in nature – Google Map Creator doesn’t handle alphabetic variables yet. For small ranges of alphabetic variable, you could open the DBF file in OpenOffice, make a copy of that column, and replace the alphabetic variables with discrete numeric values..." I've been trying to use GMapCreator to convert a US Congressional District shapefile from the Census Bureau into custom tiles, but I keep running into an error that I can’t seem to figure out. At first, I was getting the .prj error message (even when it existed) but eventually seemed to have gotten past then. Then, it looks as though everything is proceeding just fine until the very end when I get this message: “No fields in the shapefile contain numeric data. The file must contain geometry and at least one numeric field which determines the value of the region.” Any suggestions? Could you explain this a little better?

“2. A thematic variable you can plot that is numeric in nature – Google Map Creator doesn’t handle alphabetic variables yet. For small ranges of alphabetic variable, you could open the DBF file in OpenOffice, make a copy of that column, and replace the alphabetic variables with discrete numeric values…”

I’ve been trying to use GMapCreator to convert a US Congressional District shapefile from the Census Bureau into custom tiles, but I keep running into an error that I can’t seem to figure out. At first, I was getting the .prj error message (even when it existed) but eventually seemed to have gotten past then. Then, it looks as though everything is proceeding just fine until the very end when I get this message: “No fields in the shapefile contain numeric data. The file must contain geometry and at least one numeric field which determines the value of the region.”

Any suggestions?

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