Dotaz na použití symboliky podle hodnoty pole

Question

V jedné webové mapě mám několik tisíc bodů, z nichž každý má vlastní kategorii symboliky. Lze použít určitou symboliku podle hodnoty pole? Například výraz Arcade:

IIF($Attatchment != "", použít tento symbol, pokud je prázdné, nic neměnit)

Pole, na které se ptám, je pole příloh. Uživatelé v terénu pořizují snímky bodů. Bylo by ideální, kdyby terénní pracovníci podle symboliky viděli, zda je k danému bodu už připojen obrázek. Ruční změna symbolů není proveditelná.

Zdrojová vrstva těchto bodů je hostovaná na Arc Serveru. K této vrstvě mám přístup na svém místním počítači v ArcMapu, což by případně mohlo nabídnout další řešení.

XanderBakker · Answer

Good one, I forgot that I posted that option... There might be another alternative. Will dive into that and post later...

Edit: I guess you could use the suggestion provided by Nat Carter (see last comment: https://community.esri.com/thread/117274#comment-695968 ) to create two layers and include a definition query and publish those. It works in Desktop and might work in the published service too.

Anonymous User · Answer

Howdy!

It looks like you can run some custom symbology logic from the root data (How to symbolize which features have attachments? ) and then should be able to publish up using that symbology logic.

If that doesn't work for you, you could also have a Python logic that parses the feature's endpoints for the attachment count: Attachment Infos (Feature ID: 298186). You'll probably need some solid experience with Python and XML/JSON parsing, but it could also accomplish what you're looking for.

XanderBakker · Answer

When you apply Arcade for symbology you will return values (numbers or strings) that you will base your symbology on. There is another aspect to take into account and that is the fact that the attachment is in a related table, not in the feature layer itself, so your Arcade script does not have access to it (yet, since this will probably be possible in a future release or Arcade).

You can create a script (and program a scheduled task) that will populate a field (with the count of related attachments or a simple "Yes", "No") that you can use to symbology the data on indicating if a geometry has an attachment.