Latest Contributions by ChrisDonohue__GISP

‎11-19-2014

Interesting. Can you post a snapshot of the first several lines of your attribute data?

‎11-19-2014

Here's an example I threw together quickly, which I think might be representative of what you are trying to do (please see attached jpg): I'm assuming you want to symbolize simulataneously with two fields, so chose the "unique values, many categories". To have ArcGIS provide all the possible data combinations, hit the "Add All Values" button and it will come up with a default series of symbols for all the combinations in your data. The symbology itself can then be modified to suit your needs in the window in the Layer Properties, Symbology Tab. Click on the Symbol in the "Symbol" column and a "Symbol Selector" window will come up with many symbol options, including size and color. You can also edit the symbols by clicking on them in the Table of Contents. Chris Donohue, GISP

‎11-19-2014

Here's a starting point: Symbolizing data based on unique attribute values http://resources.arcgis.com/en/help/main/10.1/index.html#//006300000018000000 If this doesn't provide what you need, let us know what else is needed. There are other ways to do the symbolization, so more detail would be needed to chose the best method (they tend to get more complex). Chris Donohue, GISP

‎11-18-2014

As a workaround for now, you may want to create the new feature class for your zones in a new File Geodatabase on a local hard drive, then consider moving it to a the MSSQL database after you have all the zones drawn in. If you are going through SDE to get to the MSSQL database, it may be that there are permissions set in SDE to prevent data changes. Chris Donohue, GISP

‎11-18-2014

Unfortunately, the writeup states that geodatabases are untested and unsupported by this tool. One can build a version of the same thing that will do geodatbase output with Modelbuilder. It could be done with an "Iterate Row Selection" iterator with the "Group by Fields" set to the category field. Then add a Copy Features tool to the right to save each selection that comes out of the Iterator as an output. Then to have the output name the file by category, you can use an in-line variable (see below): What is Modelbuilder http://resources.arcgis.com/en/help/main/10.1/index.html#//002w00000001000000 Iterators http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00400000001n000000.htm In-line Variable Substitution http://resources.arcgis.com/en/help/main/10.2/index.html#/Examples_of_inline_model_variable_substitution/002w0000005w000000/ Chris Donohue, GISP

‎11-18-2014

Based on ESRI, it sounds like there is a way to do it through topology. However, I have not tried this particular challenge myself, so am not totally sure. Editing Shared Topology - Selecting Topological Edges http://resources.arcgis.com/en/help/main/10.1/index.html#/Selecting_topology_edges/01mm00000007000000/ Chris Donohue, GISP

‎11-18-2014

Looks interesting. Prebuilt, so no need for Modelbuilder and/or coding to get the same results. Chris Donohue, GISP

‎11-13-2014

Here's some information to help get you started Fundamentals of Georeferencing a dataset. http://resources.arcgis.com/en/help/main/10.2/index.html#//009t000000mn000000 You can decide on whether to rectify it after georeferencing. Chris Donohue, GISP

‎11-13-2014

If the two images were in the same projection originally, and covered exactly the same extents, it may be possible to line them up by copying the World File from the working one and then renaming the copy to the file name of the non-working one. For example, for a tif image, copy goodtif.tfw and rename it to the other rasters name (and keep the .tfw extension). Then open a brand new ArcMap session and load them both in. Note that you definitely need to start a new session - the addition of a world file won't help for images already loaded into ArcGIS. However, the liklihood that the images are exactly the same is a longshot. More likely Georeferencing will need to be employed to get the two aligned. One thing that would be helpful to know in terms of troubleshooting this is the raster file type of the imagery you have. Are they tiffs, sids, jpg, or another of the many image formats? This information is helpful to know as different rasters have different properties. For example, some rasters also can have the extent embedded in the raster itself, which can override the world file. Chris Donohue, GISP

‎11-13-2014

There are several ways you could do this. Probably the easiest is to Intersect (Geoprocessing tool) the two buffers to produce a feature class that only contains the overlap area. Then run a Select by Location for the students using the newly-derived overlap feature class. Chris Donohue, GISP

‎11-13-2014

Welcome to GeoNet. If you have any questions, go ahead and post - there's bound to be folks who know the answer. Chris Donohue, GISP

‎11-13-2014

Dan: This is a nice summary in your blog. I didn't know about the Python Code Snippet function - that will be handy. Thanks for posting that. Chris Donohue, GISP

‎11-13-2014

I think Iterate Row Selection will work for you. Note that there is a setting to change that will do the sorting by County that is built into the tool already. Here's what you do: 1. Click on the Iterate Row Selection tool in Modelbuilder. 2. When the tool window opens, go to the "Group By Fields (optional)" pulldown and select the field that denotes your counties. 3. Hit the Plus sign icon on the right to add it in. 4. Hit OK. Now the iterator will grab all the selected rows for each county. In regards to outputting this, I think a "Copy Features" tool will work. Attach this to the right of the Iterator. Use the "Selected Rows" that come off the Iterator as the input to "Copy Features". In regards to the output file names, if you want the county name included in the output, the "Value" from the Iterator (which will be county names) can be used as what they call an "in-line variable" to name the output. Basically, in the file naming, one adds %Value% to the file name. Each time the iterator runs and a file is made, the part with %Value% gets the County name. This is very handy for keeping the files organized. Here's some information on that. http://resources.arcgis.com/en/help/main/10.2/index.html#/Examples_of_inline_model_variable_substitution/002w0000005w000000/ Chris Donohue, GISP

‎11-12-2014

A few quick questions to help sort out what you are trying to achieve: How do you want the results grouped? For example, would it work to output the Feature Classes for County A into a folder named County_A, then Feature Classes for County B into a County_B folder, etc? Also, I was wondering if the intent is to select from each Feature Class only the features that fall within each County (i.e. the Feature Class contains features that fall in multiple counties)? Chris Donohue, GISP

‎11-12-2014

Ooof. Sounds like you are a grad student. Unfortunately, using Python in ArcGIS is not something that is learned immediately, so if you haven't had an opportunity to study it before, hopefully you have some time before this project is due. One potential solution - if you know Modelbuilder at all, you can create your analysis process there, then export the whole thing as a Python Script. Given that your analysis criteria don't appear to be too complex, this could work out well. For the most part you would not have to learn Python, as Modelbuilder will create the code for you. Modelbuilder (in general): http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002w00000001000000 Exporting Modelbuilder to a Python Script http://resources.arcgis.com/en/help/main/10.1/index.html#//002w00000031000000 Chris Donohue, GISP

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