Latest Contributions by ChrisDonohue__GISP

‎11-26-2018

It appears to be working at the moment. I was able to download it. EDIT: Scratch that - I just realized I downloaded the 9.3.1 file. The 10.2 file does not want to download. Some ideas as to why this did not work: Maybe the server was down earlier? I would consider contacting ESRI Support and see if they have any insight. Maybe the Internet Browser used is a potential issue? I tried Firefox, but there may be a specific browser that is needed. Lastly, there may be security constraints in place by your organization that may be not be obvious that are limiting it. Chris Donohue, GISP

‎11-26-2018

For the layers where the existing projection/coordinate system is already defined and one wants to change them to a different projection/coordinate system, one way to do this is by using the Project geoprocessing tool, which can be found in the Data Management toolbox. Project—Data Management toolbox | ArcGIS Desktop If instead the projection/coordinate system is unknown or incorrectly assigned and one is sure what it should be instead, one can use the Define Projection geoprocessing tool to update it. Define Projection—Data Management toolbox | ArcGIS Desktop Chris Donohue, GISP

‎11-13-2018

Some questions: How is the data stored? Feature Class in a File Geodatabase? Enterprise Geodatabase (SDE)? Shapefile? Personal Geodatabase? Which software and what version of the software are you using? ArcGIS Desktop? ArcGIS Pro? Chris Donohue, GISP

‎11-09-2018

For a start, here's a diagram from an earlier version of ArcGIS Desktop which is helpful in understanding the whole process (I believe the process steps are still the same in ArcGIS Pro). I am not a floodplain expert, but I have done some modelling, so this may be of help. Source: Deriving runoff characteristics—Help | ArcGIS for Desktop Also, besides the above process, there can be some confounding issues that interfere with outputting a nice neat result. For example, the Digital Elevation Model (DEM) may not be a fine enough resolution to discern where the streambanks are, or other constraining influences. Likewise, a bridge may be represented in the DEM as a solid obstruction when in reality there is a location where the water flows below it. Pipes and diversion ditches may also influence the result, yet not be discerned. So data cleanup is often a necessary step. All these unwanted issues need to be identified and then remedied. One common remedy is to "burn in" the proper morphology into the cells where the DEM misinterrprets the reality. For example, one could use Raster Calculator to do a subtraction on a cell where a bridge was recorded as a full feature to create the "gap" for the water to pass through. Also, the settings used in some of the specific tools can affect the outcome. For example, you results can vary tremendously depending on how the Sink-filling is handled. Flow Accumulation is another one where the setting chosen (Expression setting) will produce different results depending on what is chosen. Anyways, I would start with evaluating your process first. Ensure all the needed steps are being done. Expect to run several iterations as the settings are adjusted to find the most representative outcome. Also, probably more than you want to know, Floodplain mapping can get very complex (there are folks here on GeoNet who do complex modelling of Floodplains). For example: ESRI International Users Conference 2018 Demo by ESRI Staff - 3D Water Surface Elevation Modeling Good luck with your project, Chris Donohue, GISP

‎11-08-2018

My bad. As Dan mentioned, don't start with a number. Chris Donohue, GISP

‎11-08-2018

Besides what Dan Patterson specified, ensure there are no spaces in filename and folders. Having a space can be the kiss of death when running raster processes. If a space was used for clarity, use an underscore _ instead. For example, the path showing in the run message appears to end with "2017RC DATA". Throw an underscore in there instead of the space. I.E. "2017RC_DATA". It terms of file naming and structure, Rasters are finicky... Chris Donohue, GISP

‎11-02-2018

The ideal schema approach is workable. Alter Fields at first seemed like a possibility, but unfortunately is moot as there is a software limitation in that the user only has ArcGIS Desktop 10.0. If I recall correctly, Alter Fields was a new innovation ESRI rolled out in ArcGIS Desktop 10.2. In regards to using the Delete Field geoprocessing tool on a shapefile, it does seem to have this functionality. At least, it works in ArcGIS 10.4.1 (see below): Chris Donohue, GISP

‎11-02-2018

There are several processes that can help accomplish this: Delete Field (Data Management) geoprocessing tool: Delete Field—Help | ArcGIS for Desktop Caveat: While the tool will work with ArcGIS Desktop Basic am not sure if this tool exists in ArcGIS 10.0. As to adding the new fields: Add Field (Data Management) georprocessing tool: Add Field—Data Management toolbox | ArcGIS Desktop (same for both Pro and Desktop) To handle all 300 at once, automate it all by using either: Modelbuilder What is ModelBuilder?—Help | ArcGIS for Desktop Place all your shapefiles in one folder. Then use an Iterator in Modelbuilder to loop through all your shapefiles within that folder. OR Python Scripting What is Python?—Help | ArcGIS Desktop Chris Donohue, GISP

‎10-29-2018

What CBenkelman-esristaff suggested is the way to go. Some helpful links if you are unfamiliar with Mosaic Datasets: What is a mosaic dataset?—Help | ArcGIS for Desktop Creating a mosaic dataset—Help | ArcGIS for Desktop Chris Donohue, GISP

‎10-29-2018

Not sure if this will address the issue you are having, but is it essentially related to having a different spatial extent than expected due to all the editing? If so, you can run a geoprocessing tool to update this. Recalculate Feature Class Extent—Help | ArcGIS Desktop Also, if this is not the issue, can you provide more specifics on what processes/software is being used currently in the processing? ArcGIS Desktop? ArcGIS Pro? Also, what version? Some processing will vary depending on variables like the software being used and the version. Chris Donohue, GISP

‎10-18-2018

One way to go is to process each polygon individually. This can be automated by employing Modelbuilder or Python. I'm not great with Python, but here is how to do it with Modelbuilder: Create a New Toolbox. What is ModelBuilder?—ArcGIS Pro | ArcGIS Desktop Create a Model Edit the Model. Add your polygons and your buffers Add an Iterator. Examples of using iterators in ModelBuilder—Help | ArcGIS for Desktop Use "Inline Variable Substitution" to ensure there is a unique output for each buffer run. Otherwise each time the Iterator moves on to a new buffer it will overwrite the output with the result from the latest iteration. Inline variable substitution—ArcGIS Pro | ArcGIS Desktop Note: you probably can also add in the processing to do the calculations as another step in the model. Calculate Value—Tools | ArcGIS Desktop Note that if you have not worked with Modelbuilder before that it will probably take some front-end time to learn it and get confident with it. I'd suggest saving off just a few buffers to a separate feature class for testing purposes until you get the Model working, then point at the full buffer dataset to do the runs. Also - be sure to keep the file paths and filenames simple. Ensure there are no spaces in either the file paths or filenames, or the model will often fail with no error message. Likewise, if the path is very long, even if it has no spaces the model may fail to run, and again no error message. It is pretty common to have to do data organizing and cleanup like this before doing a run for the first time on data. Chris Donohue, GISP

‎10-04-2018

What Jay Sandhu suggested will likely cover it. But if there still is an issue, check to see if the problem area streets are attributed as 'one-way". I've several times seen data goofs where street segments were attributed as one-way when they are actually two-way (and vice versa). Also, check the other Network Attributes. Look for weirdness, like a Speed of zero. If you are modeling one-way streets, be sure that your edge sources have a field specifying one-way street information. The New Network Dataset wizard recognizes a string field named One_Way or Oneway, creating evaluators that interpret its values as follows: FT or F indicates a one-way street permitting travel only in the digitized direction of the edge. TF or T indicates a one-way street permitting travel only against the digitized direction of the edge. N indicates a street that does not permit travel in either direction. Any other value indicates a street that permits travel in either direction. Creating a network dataset—Help | ArcGIS Desktop Chris Donohue, GISP

‎10-02-2018

Ouch! Chris Donohue, GISP

‎10-01-2018

On the Modelbuilder side, one of the issues that may be occurring is that the process is actually running through and extracting all the features, but what is output shows only the results for one feature class. This occurs if unique output names are not specified; instead what happens is the same output gets overwritten again and again. To resolve this, use In-Line Variable Substitution to allow for the creation of uniquely-named output. Inline variable substitution—ArcGIS Pro | ArcGIS Desktop Chris Donohue, GISP

‎10-01-2018

There are several ways to do this, but it will depend upon how the data is set up and in what environment it is stored. For example, if the data is not stored in a Enterprise geodatabase feature class and it has attributes that match how you want the segments merged, one could run a Dissolve geoprocessing tool based on the attributes. To do this, when running the tool, one would select the field that differentiates the line segments and add it to the "Dissolve Field(s) (optional)" area. Say if you wanted to merge all streets by street name, if there was a street name field that could be used here to accomplish this. Dissolve—Help | ArcGIS for Desktop Which software package are you using? ArcGIS Desktop? ArcGIS Pro? Other? What version? Advance license, Standard, Basic? How is the data stored? Feature class in File or Personal Geodatabase, feature class in SDE, shapefile, coverage? Chris Donohue, GISP

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Date Last Visited	‎08-03-2022 01:39 PM

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Latest Contributions by ChrisDonohue__GISP

Re: Impossible to download the predictive analysis tool

Re: Spatial reference does not match data frame

Re: %Name% variable error

Re: Using a DEM and Flood Accumulation to find Flood Plains

Re: Struggling with raster reclass?

Re: Struggling with raster reclass?

Re: Adding attribute structure to multiple shapefiles

Re: Adding attribute structure to multiple shapefiles

Re: Scanned Maps

Re: Scanned Maps

Re: How to union to polygons with lots of overlap

Re: Network Analyst - Service Area problem (ArcGIS 10.4.1)

Re: ArcGIS Pro 2.2 Patch 3

Re: Modelbuilder - iterative function

Re: Is it possible to remove a split on a line/polyline feature class?

Re: ArcGIS 10: Graphics won't display in Data View

Re: Can't set output as intermediate data

Re: Addressing - Plus Code or What3Words (W3W)

Re: Strange California Coordinates (-21678.911, 15...

Re: Slivers between polygons when zoomed in.

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