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Alteração/erro não solicitado na simbologia de serviços de feição em mapa e aplicativo da web

HCCGISICT_

Olá,

Nossa organização tem vários mapas da web que alimentam aplicativos disponíveis em nossa galeria pública de mapas.

Recentemente, neste mapa específico:

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

Dois serviços de feição apresentaram falhas na simbologia, sem que tenhamos feito qualquer alteração. O conteúdo das classes de feição permanece inalterado desde a publicação inicial, no começo de novembro de 2015.

Inundação por perigos costeiros
Faixas de risco de erosão costeira

Tentei remover os serviços do mapa, salvar o mapa, excluir os serviços de feição e as definições de feição, republicá-los e adicionar os novos serviços ao mapa, mas nada mudou. Ao tentar adicionar os serviços de feição republicados a uma nova janela de mapa, o resultado é semelhante. Também tentei executar uma verificação de topologia em busca de erros, mas não encontrei nada que parecesse ser um problema.

Consigo exportar os serviços de feição como shapefile no ArcGIS Online, baixá-los e abri-los no ArcGIS Desktop sem erros de simbologia.

Qualquer orientação será muito bem-vinda.

Atenciosamente,

Roy Langman

Prefeitura de Hobart

Tasmânia, Austrália.

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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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