Latest Contributions by ChrisDonohue__GISP

A general observation - when folks find they need to use iterators with conditions, that often is the point they end up going to Python scripting instead of Modelbuilder. That said, there are some options in Modelbuilder to do what you are looking for.   But Modelbuilder is limited in this regard.  It will depend in part on how complex a condition is that you want to trigger the end of the run and whether the data is structured to support this. Some possibilities: Use a While Iterator (likely part of a "model within a model strategy" as mentioned by Joe Borgione )  While—Help | ArcGIS for Desktop  Use a Stop "Model-only tool".  This can be useful  if one does not want to do the "model within a model strategy"  Stop—Help | ArcGIS for Desktop  It may be possible to write a short bit of Python code to do the check for when to stop, then import that into Modelbuilder as a script tool and then add it to the Model.  A quick tour of creating tools with Python—Help | ArcGIS for Desktop  There are Iterator properties that can be set at the Model-level that may do what you want.  In the Model itself, click on "Model" in the top menu, then  "Model properties...", then in the window that pops up the "Iteration" tab.  There are several possibilities here.  This may also be useful in conjunction with a script tool that checks for the condition, then sets a variable false when that happens.                                                                                                                                                                                      Chris Donohue, GISP ... View more

There are several strategies to do this.  Here's a couple that can work if the data is in two or more feature classes (shapefiles): Select by Location  Using Select By Location—Help | ArcGIS for Desktop   When using this process, look at the various "spatial selection options... " that can be chosen in the tool. Buffer the river polylines by a distance, then Select by Location using the buffer as the basis to select lines. Buffer—Help | ArcGIS for Desktop  Also, can you expand on how the data is organized?  Are you working with all the lines in one feature class or more than one?  I.e there is just a rivers shapefile or instead there is a rivers shapefile and say a roads shapefile. Chris Donohue, GISP ... View more

Just a quick workflow idea that could be tried if you have access to Spatial Analyst or 3D Analyst.  Untested, but I think this could work.  It would need to be fleshed out with the specific processes (this is just the basic process). Convert the polygons to lines Combine into one feature class (if not already) Add an integer field called "Elevation" Populate one line with zero and the other with 100 Convert the lines to a surface (raster) Contour the surface, specifying an elevation of 50.  This will essentially produce the result you are seeking. Convert to vector, then Convert the lines back to polygons. Chris Donohue, GISP ... View more

Some ideas of the top of my head.  Neither will totally solve the challenge, but may spur ideas: 1.  Contact the County Assessors office for the Right-of-Way (ROW) polygons and then use the Merge geoprocessing tool to combine them with the Urban Renewal polygons.  Then Select ones that belong together while in an editing session and use the editing Merge to then come up with one large polygon for each set of urban areas.  This may entail some Cutting of the ROW parts to match the urban areas. 2.  If the ROW polygons are not available, find some overall large polygon feature class that extends beyond the Urban Renewal polygons and use the Erase geoprocessing tool to come up with the difference.  Then Merge the Erased feature class with the Urban Renewal polygons. In editing mode cut the added Erase polygons where need be, then in editing mode use the editing Merge to join them together.  Alternately, it may work to use Eliminate for this last part. Eliminate—Data Management toolbox | ArcGIS Desktop  3.  Just a guess - I bet there is a raster way to do this.  Or with Bounding Boxes.  This guy might know:  Dan Patterson  Chris Donohue, GISP ... View more