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I'm not an expert on DEM's and their downloads, but here's some ideas based on my likewise flailing around on my infrequent downloads of them: An idea - there are several options in Download Data section of the National Map Viewer. One is "Click here to draw and download based on a bounding box." This could help limit your selection. Also, I believe the 30 meter DEM's match the same extents of USGS 24K Topo Quads (though I could be off on this). This may offer another way to determine which ones you need - there is a reference layer that can be displayed for the 24k Quads. Then the crux issue - once you go to the Download function, it returns a long list of different files, making it difficult to figure out which one needs. I believe for 30meter DEM's the files you want to download are just the ones listed as "1 arc-second" under the Resolution column. However, I'm not 100% sure on that - maybe someone who is more knowledgeable can chime in on that? Hope this helps, Chris Donohue, GISP
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12-04-2014
03:59 PM
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A few of questions to help clarify what you after: 1. Which software are you using? ArcGIS Desktop, ArcGIS Online, etc. 2. When you say you want a count for the layer of stores per state, do you mean in the Legend? For example, the legend item for Arizona followed by the count. Or in the Table of Contents (if ArcGIS Desktop)? Or a separate table of states with their counts placed on the map? 3. Is the count already compiled, or are you looking for a way to create the count of stores per state? Chris Donohue, GISP
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12-02-2014
12:55 PM
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What you ran into is a common issue that comes up when doing Network Analysis - the data seems all ready to go, but in reality it takes a bit of preparation and troubleshooting to get it ready for analysis My experience is that most Network Analysis projects are 90% data preparation and 10% actually running the analysis.
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12-02-2014
07:44 AM
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That was part of what made it cool - one could go back and forth to GIS with the Plug ins. Plus it was very easy to use. The company that made SketchUp (@Last Software) was very small, and if you called tech support for them you could get anyone from the company heads to the programmers (and they were all knowledgeable and enthusiastic). If you suggested additional functionality, they often would create it within a short time. We had a great user experience with them. The company was sold to Google around 2007. I hear that Google sold it to Trimble in recent years. I don't if/how that has affected their software and user experience.
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11-26-2014
10:32 AM
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Another idea - review the Select Layer By Location "Selection Types (optional)" to see if the setting is not the appropriate one. It may be that it is defaulted to a different setting than needed.
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11-26-2014
08:56 AM
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SketchUp has been around since before 2006. In that year, Urban Planning colleagues of mine discovered it and were using it for a plethora of projects. They really liked it. I played with it a bit and found it to be very intuitive. I have not used it in recent years, though.
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11-26-2014
08:44 AM
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The lyr files can still be saved if you want. What would change is the model would branch instead of being linear. One branch off I_InZips_Name would go to the Save to Layer File, another branch off I_InZips_Name would go to Select By Location. Anyway, see if it helps to do the direct feed from I_InZipsName to the Select By Location - that's the critical part to troubleshoot first, as it looks to be where things are going awry.
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11-25-2014
04:05 PM
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That helps. Just a thought - maybe try the Select By Location directly off "I_InZips_Name" instead of the layer file. Layer files have some unusual properties and are sometimes problematic when doing analysis. Also, can you mention what the characteristics are of the results that didn't work? What exactly about them is unexpected/not working? This will help in troubleshooting.
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11-25-2014
03:42 PM
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Quick question to help clarify this - is the input labeled "InZips (3)" the same as the input "InZips"? It looks like you stated that above, but I wanted to confirm it. The reason I ask is twofold: 1. If it is the same, usually it would be connected to the first input ("InZips"). 2. The other reason is the Select By Location appears at first glance to be unneeded. The features are already selected, and how it is set up now seems to reselect the already selected features. I suspect I am missing something obvious, or there is another intent to this. Can you clarify what the Select By Location is for? Thanks, Chris Donohue, GISP
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11-25-2014
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Here's an alternative software that may do the trick, should no one know of a good GIS solution. SketchUp http://www.sketchup.com/ Chris Donohue, GISP
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11-25-2014
02:47 PM
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Somes troubleshooting ideas: If you haven't already done it, I'd start by running topology on all the participating datasets. Use rules to ensure that you have connectivity between all the edges. It's been my experience with network analysis that there can often be very small gaps between the edges that throw the analysis, even though visually the lines look connected even when zoomed way in. One rough and dirty way to check for this without doing the topology is to run a few Service Areas at several distances. If you notice the Service Areas not covering areas with linework (edges) at the expected distances, that points towards issues. It may be a disconnect is present, or that some of the edges have a directionality error (set one-way when they should be two-way, or set opposite the direction they should be). Another potential issue - be aware that the Search Distance sometimes will fail to find nearby edges, even when they are within the set distance. In this case, you may have to digitize in added linework from your existing edges to the points to ensure a connection. Be sure to check the topology of whatever you added. Chris Donohue, GISP
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11-25-2014
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That I don't know. Somewhat related, there is a Delete Fields tool. But I'm not sure if a workaround with that will help.
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11-20-2014
01:58 PM
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Here's a reference: Field names cannot be longer than 10 characters. Geoprocessing considerations for shapefile output http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002t0000000m000000 There are also specific known restricted character issues that are commonly run into when converting from Coverages to Shapefiles. I used to have a link to a nice information page on that, but I'm not finding that information so far (and I lost the bookmark for it).
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11-20-2014
01:55 PM
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I think I just figured out what the potential issue is. The final Feature Class to Feature Class is going from a Coverage to a Shapefile. Not a problem in general, however, there are often field name issues when transferring data from a coverage to a shapefile (and reverse). For example, field names that are OK in one file type are not OK in the other due to the differing restricted characters, allowed field lengths, etc. This can cause data to not transfer correctly.
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11-20-2014
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Forgive me if I am missing something obvious, but I don't see any processes that would differentially add fields, so therefore it seems all the fields would be constant. What is causing there to be different fields between iterations? ( I realize there may be scripts and coding hidden in the model that can't be seen in the image) Knowing where processes are adding/removing fields would help in troubleshooting this.
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11-20-2014
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