Latest Contributions by DuncanHornby

Just want to say I too hit this issue with a survey 123 table, it displays the alias in an attribute table when I need to see the field name. I would like an option in the attribute table menu to flip between alias/name. ... View more

If you have access to ArcPro then have a look at RivEX, it has many tools for processing sites along rivers. You can very easily create 3km u/s and d/s reach polylines by using one of the reach generation tools. The RivEX manual has a section of worked examples to inspire users with the wide range of river related processing that can be done. ... View more

@JMutunga  I had searched high and low the help file for any advice on the merge policy. I have to say 1 line tucked away on the tool is a bit obscure! And its not even emphasised by say the grey box that the documentation uses. I had crashed around the help file on the pages that document domains and these polices. That's where I had been searching for any advice. I would recommend you get your help documentation team to replicate that 1 line (I'm sure they can find the time to do that) and state within the domains policy section here that it does not actually apply to the Merge edit tool. With that said it has been good to get some clarification and I had not been doing something wrong with setting up a merge policy on a domain. This useful discussion leads me to one final question, when does the merge policy get execute, does it only run when using the merge or dissolve geoprocessing tools for example? ... View more

The tool RivEX can help with this problem as long as your river network is vector and not a raster network. If you define the main river as starting at the mouth of the network then RivEX has the Add Main Channel. If you are starting at some random point within a catchment is the main channel the route to source? If so you could use the Find source of site tool. If your definition of main river from some random starting point is the route to source and route to network mouth then you could use the Create site centred reach and set the distances to a very large value to ensure searching reaches the source and mouth, an example is shown below.   ... View more

I believe the issue is that having selected the watershed and used that selection to select the points within it you do your first attribute selection, that immediate "destroys" the selection based upon the watershed polygon. You have two options, start using an iterator and get your head around embedded sub-models, or the more clunky but easier to understand is for each attribute selection have a separate select by location before it. At the moment you have three select by attributes feeding from one select by location, you want to duplicate the location tool each with the select HUC tool feeding to them. With that logic after a select by attribute has run the selection on the wells is reset by the location tool. ... View more

Have you tried typing into Google "image detection of beach line vegetation"? Didn't take much to get here. ... View more

I think this functionality is broken in ArcPro, I made the same question in September last year here and no one from ESRI has stepped up to say why. May be I have done something stupid, but your workflow is identical so makes me think it's broken?  Would be good to get some clarification from ESRI! ... View more

Sorry are you saying you are trying to insert a vertex into a polygon that is composed of 8 million vertices? I would imagine any sort of spatial processing would be quite slow and you would need to dice up your data? ... View more

You state that you are aware that ArcMap is being retired but you don't actually say if you want to make the jump to ArcPro? If you do then I would say many of your steps could be automated in arcpy, driving ArcPro projects for map production.  You don't need the heavy investment of using VB/C# in visual studio.  You can run python in an IDE, don't even need ArcPro open if that's what you want. What might be highly problematic for you is that ArcPro does not support MS Access in the way ArcMap use to. A failing of ArcPro in my opinion as MS Access is a very useful and powerful database software used by many. You could use the interoperability extension to export from an accdb as an intermediate step. ... View more

I'm surprised the HitTest() even works as the help file indicates the first parameter is a point object which in your code you don't supply? ... View more

The link to your model graphic does not work. ... View more

Have you reviewed any of these solutions? https://gis.stackexchange.com/questions/333819/displaying-lines-which-share-segments-by-offsetting-them-only-where-they-overlap https://gis.stackexchange.com/questions/37777/representing-overlapping-lines-in-arcgis-desktop https://community.esri.com/t5/public-transit-questions/transit-map-with-offset-routes/m-p/1003771 ... View more

Same question was asked and answered on GIS StackExchange here. ... View more