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Ice Cream and Topology


It is still a crazy time around the office of PetersonGIS. It may appear to be all quiet and calm but the manuscript deadline for the 2nd edition is fast approaching and things are not moving as swiftly as I had guessed. Age-old problem, I know. This is what keeps me motivated, though…the thought of getting myself one of these on THE DEADLINE DAY, Nov. 1, 2013:

Thanks to everyone who has submitted a map for potential inclusion in the book. I’m going to carefully go through all of them just as soon as I can. I was supposed to do that this week but it’s not going to happen. I’ll let you know yes or no just as soon as possible.

Currently on the radar is figuring out just what the heck is going on with ArcMap 10.1. Here’s a map from 1st edition that needs updating…

You can see it’s not entirely topologically correct. In the process of trying to export a new map, Arc wants to convert the dashed lines for the little tributaries to solid lines. But how did I solve the issue back in 2008 when writing the 1st edition? It’s a mystery! The stated workaround according to Esri is to use the symbol property editor but I’ve got these as simple line graphics as my own workaround to another problem. It really never ends. Perhaps when you pick up a copy of the 2nd edition sometime in 2014 you’ll get to find out if I ever solved it. :)

Updated 10 min. later—I’ve just discovered that I can simply save as a lower resolution file to keep the dashed lines. To get around the fact that I need a high res output, I’ve increased the size of the original so that it can be reduced in size proportionally to an acceptable resolution.

This entry was posted on October 10, 2013, 12:15 pm and is filed under News. You can follow any responses to this entry through RSS 2.0. Both comments and pings are currently closed.

  1. #1 by Jeremy Wright on October 15, 2013 - 4:34 pm

    Gretchen,

    Are you using a simple line symbol with style “dashed”? Use a Cartographic line instead. The dash pattern gets denser with higher resolution on the “simple line symbol”, it’s a longstanding bug due to the type of GDI commands used to render simple line symbols.

    I’ve included the link as my website link.

    Regards,
    Jeremy W.

  2. #2 by G.P. on October 16, 2013 - 8:40 am

    Hi Jeremy-Thanks for your response. Yes, I’ve got these symbolized as simple line graphics as stated in the post. This was due to some other issues I was having but you’re right…I could now convert them to features and then use the cartographic line. I’ll keep that in mind for next time!

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