Splitting contour lines
Posted 11 February 2009 - 02:22 PM
Posted 11 February 2009 - 05:52 PM
co-cartographic creator of boringmaps.com
Posted 11 February 2009 - 06:23 PM
What are some ways of splitting contour lines so that they can be colored to reflect a change in land cover (ex. blue contours over glaciers)? I've tried doing this in Illustrator's pathfinder but have had no luck. Cutting the the lines manually is not an option. (I'm also working in ArcGIS and Photoshop, if those tools might help.) Any tips?
In ArcMap you can add a field in the attributes database, (call it something that makes sense to you) then select all of the contours that you want a different color and label them in the new column you made (something that makes sense to you). Then all you have to do is choose categories in the symbology tab of the layer properties and add the newly created attribute field to the list and symbolize it any way you want. You have to start an editing session in order to do this.
Posted 11 February 2009 - 07:29 PM
World Sites Atlas
Posted 11 February 2009 - 11:05 PM
1. Reclassified my land cover data to isolate the category I was interested in (reclassing it to "1" and everything else as "0").
2. Used "Raster to Polygon" tool to convert the land cover raster to a vector layer
3. Used "Intersect" tool to intersect the contours with the land cover vector layer
4. Changed the symbology of the resulting contour layer to category/unique values, using the "gridcode" in the value field so that I could select different colors for the "0" contours and the "1" contours (the ones that overlapped the land cover)
5. Exported this contour layer to Illy and adjusted the colors by using "Select Same - Stroke Color"
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