Latest Contributions by ChrisDonohue__GISP

I can't answer for ArcGIS Pro's flavor of Modelbuilder, but in ArcGIS Desktop's Modelbuilder one would set the output as a "Model Parameter".  This way, if the Model is run as a Tool, it will prompt the user for an output location.  Note, however, that the prompt will not come up if the model is run in Edit mode. Chris Donohue, GISP ... View more

If one wants to create a map based on individual polygons in a layer, those polygons can be used as the Index layer instead of the more typical Strip Index Map or Grid Index Map.  See the example below: The index layer does not have to be a grid. It can be map features. For example, you can create Data Driven Pages using a polygon layer of U.S. states. In this case, a page is created for each state. Source:  Creating Data Driven Pages—Help | ArcGIS for Desktop  Chris Donohue, GISP ... View more

You may have already seen this support article. If not, there is a workaround in it that may work: Error: SDE Error(-139) The specified coordinate exceeds the valid coordinate range  Also, Vince Angelo offers some advice in this post from a few years back that may apply: https://community.esri.com/thread/43845  Chris Donohue, GISP ... View more

Another way to solve this is to use two Select By Locations.  For example, one could use Select By Location to find the parcels crossed by the lines, then save that selection out as a new feature class, then run the second Select By Location comparing the output from the first one to the points. Using Select By Location—Help | ArcGIS for Desktop  Chris Donohue, GISP ... View more

Just an idea - a different approach based on the theory that you want the 50 closest to the fixed central point in the City.  If that is the case:  Combine all your data of each species into a feature class for each species (so you end up with two feature classes).   Create a point feature class of your central city point.   Then for each species layer, run one of the following tools to determine the distance from your central point to each of the features in a species layer (read over each to determine which way you want to do this):   Pointdistance (for older versions of ArcGIS)  Point Distance—Help | ArcGIS for Desktop  Near  Near—Help | ArcGIS for Desktop  Generate Near Table  Generate Near Table—Help | ArcGIS for Desktop   Then sort each layer by Distance to come up with the top 50.  Find the distance to the 50th feature for each species and that will become a distance value to then buffer based on your central point. Chris Donohue, GISP ... View more

There are several ways to do this.  Here's one workflow to find the proportional amount of each block group within the bus stop buffers: Add a new field to your buffered stops polygons.  Call it OriginalArea or something similar.  Make it its field type  double. Use Field Calculator to populate this new field with the value from the Shape.Area field for each polygon in the buffered stops feature class.  Making simple field calculations—Help | ArcGIS Desktop   Run the Identity geoprocessing tool  Identity—Help | ArcGIS for Desktop .  When running the tool, the Input Layer will be the buffers and the Identity Layer will be the Block Group polygons. In the resulting output, add a new field called Percent.  Using Field Calculator, derive the percent by dividing the Shape.Area field by the OriginalArea field.  Notes/Caveats: Identity requires an Advanced License.  You can do a similar process with the tools available at the basic license, but it will take several more steps to essentially duplicate Identity. The Identity step will have to be run one buffer polygon at a time to avoid issues where there are overlapping buffer polygons.  If it is desired to automate this aspect, it can be done with Modelbuilder or via Python Scripting. Chris Donohue, GISP ... View more

Any chance you have permission to build topology in your enterprise geodatabase/SDE?  That would help greatly. Also, one alternative would be to export the data into a Feature Dataset in File Geodatabase (not shapefiles), then build a topology in the File Geodatabase, then run Data Reviewer (or run the rules manually).  Note - be sure to set up the Feature Dataset with the same XY Resolution and Tolerance as your enterprise geodatabase.  If any issues crop up, fix the feature classes, then go back to SDE and replace the geometry/attributes (Atttribute Transfer tool or delete/paste).  This is a longer but viable process for when a production layer resides in SDE but for various reasons the topology is not available (this is a process for several feature classes where I work). Chris Donohue, GISP ... View more

Since it appears two Iterators will be needed, one way to approach this would be to employ 3 models:  1 each for the iterators and a connecting model where the first iterator model would be linked to the second iterator model.  In this scenario, probably the best place to put the Clip would be in the model with the second iterator. A different approach that may work would be to employ Lists.  I have not done much with this approach myself, but it looks promising. ArcGIS Help 10.1  Chris Donohue, GISP ... View more

I believe you can do this by employing the Environments settings.  (Caveat - this works with ArcGIS Desktop with the Spatial Analyst Extension.  I am not sure how ArcGIS Pro would handle this, as I don't have a copy of that). 1.  When in Raster Calculator, hit the Environments button on the bottom. 2.  Click on Processing Extent on the left to expand it. 3.  In the Extent setting, for what you want it sounds like  "Union of Inputs" would be the choice.  However, check the other types to see if a different one would better suit your needs. 4.  Then hit OK and go ahead with combining the rasters in Raster Calculator. Chris Donohue, GISP ... View more

By any chance do you have topology built for the feature class?  If so, one way potential way to go with Data Reviewer would be to use the Database Validation, Topology Rules Check function, and then import the needed Topology Rules.   If I remember correctly, those rules would be:  Must Not Overlap and Must Not Have Gaps.  However, I have not used Data Reviewer in several months, so you would need to check this. http://desktop.arcgis.com/en/arcmap/latest/extensions/data-reviewer/validating-a-topology-against-topology-rules.htm Chris Donohue, GISP ... View more

If you have access to the Spatial Analyst extension, there are several tools available that can be used to create generalized land use polygons from the imagery. Generalization of classified raster imagery—Help | ArcGIS for Desktop  Caveats: Whether this will be effective or not will depend heavily on the qualities of the source data you have available and what the ultimate requirements are.  Also, as with any modeling, expect to have to do several iterations as different settings are tried in an attempt to tune up the results. It is unlikely this will be a "run once and be done" project. Definitely Ground Truth the results. If the results are for anything but casual use one would probably want to lay this out with Quality Control and Quality Assurance methodology (QA/QC). Chris Donohue, GISP ... View more

My guess is that Jerad White is on to the root cause.  If that is the case, another way to potentially fix it is to run the Repair Geometry (Data Management) geoprocessing tool. Caveats: Run this tool on a copy of your dataset, as it affects the original directly. If the dataset to be repaired resides in SDE, then running this tool is moot, as SDE already runs checks in the background for the issues this tool fixes. Repair Geometry—Help | ArcGIS for Desktop  ... View more

By any chance is there a polyline or polygon layer for the road extents?  If you do and have access to an Advanced Licence level and have ArcGIS Desktop, here's one way to do it: If there is a polygon layer for the roads, one could use Erase to remove the segments from the road extents.  Erase—Help | ArcGIS for Desktop   This would be a very fast way to do them all in one shot. I there is a polyline layer for the roads, one could split the lines by first finding the intersections to create points, then splitting by those points.  There are several ways to do this, but one that immediately comes to mind is first using Intersect and setting the output type to points, then run Split Line By Point.  Intersect—Help | ArcGIS for Desktop  Split Line at Point—Help | ArcGIS Desktop  If an Advanced license it not available, there are other ways to do this.  Post what license level you have. Assuming the reason the trail needs to be split out is for display purposes, there also may be opportunities to use Representations for what you need instead of splitting up the lines manually.  However, that will depend on your data and take some setup time.  If this is for figure(s) that needs to be updated on regular basis it may be worth doing. What are representations?—Help | ArcGIS for Desktop  Chris Donohue, GISP ... View more

Can you post an image of the output? Also, if you have not already done it, one thing you may want to try is running Snap Pour Point tool to ensure that the Pour Points get located in the flow areas. Snap Pour Point—Help | ArcGIS for Desktop  Chris Donohue, GISP ... View more

If it is desired to create the watershed at each road alignment where it crosses a stream, then one would need a pour point at each of these locations. How Watershed works—Help | ArcGIS Desktop  Deriving runoff characteristics—Help | ArcGIS Desktop  Image source:  Understanding drainage systems—Help | ArcGIS Desktop  Chris Donohue, GISP ... View more