Latest Contributions by DavidPike

‎09-17-2023

Probably easiest to just run a Service Area analysis to identify unreachable areas after polygon barriers are applied https://pro.arcgis.com/en/pro-app/latest/help/analysis/networks/service-area-analysis-layer.htm Note the 'Lines Feature Class' section in the help above. Set the output shape type to lines and you'll get only the traversable road segments returned. You can then just use that to select and delete or erase your original edges/roads input features - that will then return the non-traversable edges due to the barriers. Also not you'd need to set a Cutoffs (analysis setting) or Breaks (input parameter) large enough to cover your intended possible area. If you don't do this, then your analysis could be misleading.

‎09-12-2023

Hi, Recently had a external choice list issue the same as described in https://community.esri.com/t5/arcgis-survey123-questions/issue-with-external-choice-list-in-arcgis/m-p/1324231 I'm facing an issue with ArcGIS Survey123 involving an external choice list and seeking insights into its root cause. Our setup has multiple surveys in ArcGIS Survey123 that utilize an external choice list. This choice list is in the form of a CSV file that we've uploaded to ArcGIS Online. The CSV file comprises three columns: 'id', 'name', and 'label'. This list contains approximately 10,000 choices. Initially, everything worked smoothly, and participants could select choices from the external list while responding to the survey. However, a peculiar problem has emerged. The link between the external choice list and some specific surveys seems to have broken. Users can view the choice list correctly when providing responses, but upon saving a response as a draft or submitting it, the chosen value transforms into 'name' instead of retaining the actual value. Notably, this anomaly is occurring only for certain surveys. Other surveys using the same external choice list remain unaffected. This issue had occurred before, and I was able to resolve it by re-establishing the link between the external choice list and the survey through Survey123 Connect. If anyone has encountered a similar issue or possesses insights into what might be causing this behaviour, your input would be highly appreciated. In trying to get Esri to troubleshoot the issue, a new group was created a shared with their tech support. However it seems that when the survey was shared to the troubleshooting group (shared via survey123.arcgis.com - collaboration tab) - it re-saved the form in AGOL and relinked the previously unlinked external choice list CSV we had hosted in AGOL. The Survey also shows as a new download available, when it should really be unchanged. I'm wondering why sharing a survey to a group is updating the form again in AGOL, and what exactly is being updated. No other item types I know of show as recently updated content in AGOL when you adjust their group sharing so I'm confused as to exactly is going on when a survey is shared. We can't explain how the external choice list then also somehow relinked itself when this happened (meaning Esri couldn't then troubleshoot it!). I also don't see how resaving the external choice CSV could have cascaded down to the form and relinked it as content. Appreciate anything, even anecdotal.

‎09-10-2023

Try following the steps in the link below to ensure you've actually created a hosted feature layer from your Excel sheet - rather than just displaying them as points in your map. When you've created this layer, add it to your WebMap and the data should then be available to use in your dashboard. https://resource.esriuk.com/blog/adding-excel-data-into-arcgis-online/

‎09-09-2023

those are UTM coordinates 39R Northing | 39 R Easting

‎09-08-2023

Is it a feature service or map service (I'm guessing you're trying this on a map service)? have you tried FeatureSetByPortalItem()? What does the url look like for this 'live' item.

‎09-05-2023

Have you got an example of the issue? A raster attribute table commonly is a count of the number of pixels which have that certain value, so I don't quite understand why you'd want to join that to your polygons as it doesn't make sense. How did you create your polygons exactly?

‎09-05-2023

Prefer this over instantiating a cursor for each row.

‎09-04-2023

Did you find the root cause? I've experienced this in the past also.

‎09-01-2023

https://support.esri.com/en-us/knowledge-base/how-to-convert-each-pixel-of-a-raster-into-a-polygon-000012696

‎09-01-2023

Sure, the Purple represents an area traversable along any road segment (from your point of origin) up to 400m, the Brown for 1200m. You can test this by simply measuring the shortest network distance (follow the most direct road route) from your source to the edge of the purple or brown. That origin to South-West route looks the simplest to measure.

‎08-31-2023

What's not working with Dissolve? Would think just setting the confidence field as the statistics field "MAX" would do it.

‎08-31-2023

https://desktop.arcgis.com/en/arcmap/latest/tools/analysis-toolbox/tabulate-intersection.htm Zone features - your polygons Zone Field - something you can use to identify later Class feature - Lines class fields - something to identify by later Then take that output table and use the Pivot Table tool (exactly how to do this is shown in the tool help link above) Note needs Advanced license. If you don't have one then https://esriaustraliatechblog.wordpress.com/2015/06/22/spatial-joins-hidden-trick-or-how-to-transfer-attribute-values-in-a-one-to-many-relationship/ but you'll need to do wrangling with the concatenated field. Also top tip is to make sure the field length in the output field properties (shown if you read the guide fully) is long enough to store all the possibilities (from experience..)

‎08-31-2023

maybe a shapefile?

‎08-30-2023

Hmmm I found the help a bit confusing, but perhaps it just needs to be wrapped in another set of brackets. snapEnv = [['WBDHU12',"EDGE",'5 Meters']] arcpy.edit.Snap('FeatureClassName',snapEnv)

‎08-30-2023

Yes exactly, or https://pro.arcgis.com/en/pro-app/latest/tool-reference/spatial-analyst/zonal-statistics-as-table.htm

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My Ideas

Latest Contributions by DavidPike

Re: Identify roads affected by barriers

Sharing Survey updates the form in AGOL

Re: Why added points are not showing in Map viewer or ArcGIS online dashboard?

Re: Coordination System

Re: arcade calculate expression - Unknown Error

Re: Copying valzes from DEM raster into polygon shapefile

Re: Example using search cursor to copy data from a cells in attribute table A to attribute table B

Re: Issue with External Choice List in ArcGIS Survey123 - Choices Not Persisting

Re: Converting DEM raster to polygons, keeping amount of pixels

Re: Service Area Analysis

Re: Trying to consolidate points with different attributes

Re: Adjacency Matrix Between Polylines and Polygons

Re: While converting feature class to spatially enabled dataframe shape_length data is not populating ?

Re: Snap Error Using Arcpy

Re: Issue extracting data from a raster layer based on a shapefile

Re: Calculate precise population using 2020 Census...

Re: Define Projection crack-down

Re: Generate polygons that represent historic air ...

Re: Enterprise geodatabase connection slow - machi...

Re: Discrepancy between measure tool and expected ...

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