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Unbeabsichtigte Änderung/Fehler in der Symbolisierung von Feature-Services in Webkarte und App

HCCGISICT_

Hallo,

Unsere Organisation hat mehrere Webkarten, die Apps in unserer öffentlichen Kartengalerie bereitstellen.

Kürzlich traten bei dieser Karte:

https://hobartcc.maps.arcgis.com/home/item.html?id=f32a803c066a457aaafa73c6003be761

bei zwei Feature-Services Probleme mit der Symbolisierung auf, ohne dass wir etwas daran geändert haben. Die Inhalte der Feature-Classes sind seit der ersten Veröffentlichung Anfang November 2015 unverändert geblieben.

Überflutungsgefahr an der Küste
Gefahrenzonen für Küstenerosion

Ich habe versucht, die Services aus der Karte zu entfernen, die Karte zu speichern, die Feature-Services und Feature-Definitionen zu löschen, sie erneut zu veröffentlichen und die neuen Services zur Karte hinzuzufügen. Es hat sich jedoch nichts geändert. Wenn ich versuche, die erneut veröffentlichten Feature-Services in einem neuen Kartenfenster hinzuzufügen, ergibt sich ein ähnliches Bild. Außerdem habe ich die Topologie auf Fehler überprüft, ohne dass dabei etwas Auffälliges zu erkennen war.

Ich kann die Feature-Services in ArcGIS Online als Shapefile exportieren, herunterladen und in ArcGIS Desktop öffnen, ohne dass Symbolisierungsfehler auftreten.

Für jeden Rat wäre ich sehr dankbar.

Mit freundlichen Grüßen

Roy Langman

Stadt Hobart

Tasmanien, Australien.

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pt_instructor

Roy, your question caught my interest and so I took a closer look at your data. I noticed that some Coastal Hazard Inundation polygons are extremely small. For example, OBJECTID=115 is just a few square centimeters. Even though these sliver polygons are, presumably, unintended, they shouldn't normally be a big problem. However, I suspect that the projection from 28355 to Web Mercator (102100) at this scale is somehow screwing things up.

To quickly test this notion, I think I would make copies of the two suspect data sets and simply delete all polygons that are less than, say, 1 square meter. Point the layers to these edited copies and republish the services. Test the web map and if it solves the problem, you could then look at more sophisticated editing techniques to preserve the areas from the slivers in your original data.

HCCGISICT_

Hey Paul,

Your fast response and advice is fantastic! I was really scratching my head as to what may be causing the issue.

I will try your suggestion ASAP.

These suggestions are helpful and will hopefully correct the current issue.

Has there been a change to the projection system used in arcgisonline which may have caused the data to do this?

Kind Regards,

Roy Langman

GIS Development | ICT services

50 Macquarie Street, Hobart, Tasmania, Australia, 7000 | hobartcity.com.au<http://www.hobartcity.com.au/>

Telephone (03) 6238 2452

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HCCGISICT_

Hello Paul,

Copied the feature classes, deleted all polygons which were smaller than one square metre, republished then added the new feature services back to my original map. The problem appears to have resolved.

I now need to deal with and issue surrounding the authors of the data set, I don't have permission to make theapparent changes I need in order to support an AGOL map service.

Did you have any luck with the question relating to why this error has occurred given we had not changed the underlying feature service?

Once again, thank you for the response.

Roy.

pt_instructor

Glad to learn that the test brought you closer to a resolution. I'm not aware of any changes to the projection algorithms, but I'll see what I can come up with. I gather that your data is unchanged between the time when everything was working fine and when you started to notice display problems with these two layers.

HCCGISICT_

Paul you are correct, the two feature services remained unchanged for a period of months.

ChrisWhitmore

Hi Roy,

Would it be possible for you to send the exported shapefile to me at cwhitmore@esri.com? We'll be able to troubleshoot and reproduce the issue internally (data would be kept confidential).

Thanks,

Chris

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