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So you want to map the buffer around your city, trimmed on one side at the halfway point with the other city? You could make a Thiessen polygon around your city and then Union it with your 3 mile buffer. You need a layer of both cities' limits. (This is assuming the limits are irregular and the halfway point is not already a convenient straight line.) Now before you ask, I know Thiessen polygons are technically only for points. But thanks to computers we can do this easily. (Here's a topic when I was figuring out how to make polygons around my streets.) Basically you turn all the city limits into a whole bunch of points at a convenient spacing, run thiessen polygons on those, and merge the sliver polygons back together into one big polygon for each city.
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04-29-2013
08:11 AM
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Have a look at the help file on georeferencing here: http://resources.arcgis.com/en/help/main/10.1/index.html#/to_another_raster/009t000001z9000000/ Regards Anthony Yup, I use this a lot and love it. Georeferencing can also be achieved with vector layers as your target location. Your map has clear topo lines, roads, and streams; those are good things to reference to if you have corresponding layers handy. Many jurisdictions share those for free download. Just do a Google search for example "free GIS data roads" for your state or country.
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04-29-2013
07:49 AM
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Hi Great Idea! Unfortunately the polygon neighbors tool is not available with arcgis 10.0. regards OK. Hmm. :confused: I'm sure there must be a way to do this. Tinker with Polygon to Line or Feature to Line, along with Split Line at Vertices. The idea being to convert the polygon boundaries to lines that are split at the vertices; eg a 5-sided polygon becomes 5 separate lines. Make sure the lines retain an attribute ID for the polygon they originated from. Then calculate the length of each line. Then do overlap analysis to see which are touching your slivers. That should get you to where you can perform my previously described workaround.
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04-29-2013
07:26 AM
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Hi No there is no Option to define which neighboring polygon should be Chosen. I think I Need a modified python code or some free Extension which allows this. Can someone help me? Many thanks The Polygon Neighbors tool claims to be able to determine the lengths of touching sides of polygons. It could be incorporated into a script. A sans python workaround (because I don't code and I'm surprised no coders have responded yet) could be done by running comparisons of the data in Excel and bringing it back in for merging. It would take about the same amount of time as searching for the right script, and involves: -Running the polygon neighbor tool to get the touching side lengths and IDs of touching neighbors. -Comparing in Excel to determine which neighbor is longest. -Creating a DissolveID field on all slivers & neighbors to tell which sliver to merge with which polygon. (These last two steps could easily be done in 2 equations.) -Bringing that new field back into Arcmap as a table join or field join. -Running the Dissolve tool based on the new DissolveID field.
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04-24-2013
07:34 AM
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Have you checked out the help page on fixing slivers? You might need some extra steps to determine which polygons have the longest touching sides, I'm not sure any of the sliver tools have that kind of option built in.
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04-23-2013
09:00 AM
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If your data is the same type (polygons to polygons, etc) and is going to be styled according to the same fields you can save the symbology to a layer file, add it to your new maps, and change the source data to point to the new shapefiles. If you need symbology based on different fields and just want a color match, you can use Export Map Styles to make all your symbols easily retrievable, they can be chosen from the standard symbols list that comes up when you go to choose a symbol. (This is also for if the data is the same type.) If you have lots of colors on data that is of different types, you may be able to script something to export the RGB values of the symbols. I know I've seen scripts to color features based on RGB values in the table so maybe it can be made to go the other way.
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04-23-2013
08:01 AM
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OK that's kinda cool, I learned a new trick today. 🙂 From there you should be able to get your triangle. If there isn't already a convenient triangle shape you like then you can make one in Paint. Use it as your Picture Marker Symbol instead of the square.
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04-09-2013
10:09 AM
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So I have two polygons, different shoreline reconstructions, one from 6,000 years ago, and one from 4,500 years ago. I would like to linearly interpolate between these two layers and project the sea level at exactly 4,900 years ago. Is there a simple way to do this. The only thing I can think to do is manually calculating a series of points with the measure function and running a spline function or something? Which measure function do you mean? If you literally mean measuring the distance with the little ruler, it can be way easier than that. Here are two ideas. 1. Create a series of regular lines crossing both polygons. Create points where they intersect the polygons (variety of ways to do that). For each line interpolate a new point between those endpoints (can be done in Excel, or Field Calculator depending how you organize the data). Create a line from those new points. Here is a concept sketch to find the middle. This would work best if your data is pretty general, where there would only be one intersection between each polygon and the crossing line. Not so great if you have capes, bays, etc, but it could probably work on those if you do multiple iterations with lines crossing the polygons at various angles. [ATTACH=CONFIG]23296[/ATTACH] 2. Convert the shorelines into points and do a Raster Interpolation. Classify or Reclassify the raster data to get a convenient class break at 4900 years ago. Convert the raster back to polygons. (This requires Spatial Analyst.)
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04-08-2013
08:32 AM
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DDP's cycle through all the features in the index layer. So if you only want 7 pages, you want 7 features. Run the Dissolve tool on your counties based on the region. You will then have 7 polygons. Set that up as your index layer for DDP.
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02-11-2013
07:03 AM
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Good question. I'd like to know why it's greyed out too. If you don't have very many color classes, you could try using graduated symbols because they allow rotation. You'd have to change the symbol sizes to all be equal and graduate the colors yourself. But it would allow attributes to control color and rotation together.
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02-08-2013
12:55 PM
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Hi Alex. This thread has discussion and some script suggestions.
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02-08-2013
12:43 PM
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I'd like to know the same thing, we are in the same boat with attributes changing mid-pipe and wanting to integrate with asset management software.
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02-06-2013
07:28 AM
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Good job with all that research. We use Granite XP. We're also a small city--9000 pop, 17.5 miles of sanitary sewer inspected on a 3-year cycle. We are quite happy with it, we've had it for a long time so I've never compared it to other programs. I only have the Viewer version and the field crew has the Inspector version so my knowledge of its inner workings is limited. We also have a separate asset management program PubWorks, for about a year now, which has a steep learning curve to input data but our PW Director loves it for his $$ reporting. We are looking at getting Granite's GIS module so we can link the inspections with the maps and with PubWorks, but like you are weighing what we'd gain from that. Not sure what I can tell you that the sales reps haven't, but if you want any examples of how it works for us I'll see what I can do.
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02-06-2013
07:17 AM
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Inserting a control - enter into the legend label sounds so great. But why can't I do it? I tried that at first too with the same problem. 😉 You right click on the symbology value and click "Edit Description," this is where you can enter text with the carriage returns. Then in the legend properties, Items tab, you can set the style for a given feature class to use the label and/or description.
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02-06-2013
06:24 AM
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GAH, this is where my lost post went! Sorry about that! I was trying to answer a different thread and evidently hopped around too many tabs at once. There's nothing wrong with how you worded your question. OK so to actually address your problem. Hopefully someone can present an automated solution, in the meantime this workaround can cut down on the labor. You can save custom RGB colors into the color palette so that you have quick access to them. [ATTACH=CONFIG]21498[/ATTACH] This topic gives a VB code (which is outdated by 10, I know) for something related, to automatically color polygons based on RGB values in the attribute table. Maybe something in there can spark an idea of how to do it with labels?
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02-06-2013
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