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Problème d'affichage de la rampe de couleurs d'image étirée

GregSpontak

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J'ai un problème avec l'affichage d'une couche d'image dans ArcGIS Online. La couche est une référence à un service REST d'un MNE (mosaïque d'images) provenant du bureau SIG de notre état. Je l'ai configurée pour s'afficher avec une symbologie étirée, min\/max, et une rampe de couleurs d'élévation. Elle est également configurée pour ajuster dynamiquement la plage. Parfois, cela fonctionne très bien, mais le plus souvent la rampe de couleurs présente une caractéristique étrange en marches (notez l'affichage de la rampe de couleurs dans la capture d'écran jointe - elle devrait être comme montré dans la deuxième pièce jointe (ElevationColorRamp)) et la rampe est aussi inversée - le blanc correspond à la plus basse élévation tandis que le bleu correspond à la plus haute.
Un autre problème est qu'elle cesse souvent de s'afficher complètement - particulièrement lorsque j'essaie de dépanner.<\/P>

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Quelqu'un aurait-il des idées sur ce qui cause cela ?<\/P>

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Merci !<\/P><\/BODY><\/HTML>

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Anonymous User

Just out of curiosity did you ever find out why this was happening to the image layer? I have similar things happening to an image layer that is set to stretch and min/max being used in a web map and application. In addition to it reversing the color ramp when zooming in and panning it is also displaying different colors in Portal versus ArcGIS Online when using the same color ramp. For example I chose a blue to red color ramp but green is showing up on the map in ArcGIS Online. We are also having an issue with another feature layer's symbology changing when we use the editing widget, not sure if that is related to the problems we are having with the image layer.

ArcGis Portal Display

ArcGis Online Display

Thanks,

- K

GregSpontak

No, I haven't had any success figuring this out or gotten any assistance.

The only additional info I can offer is that I found out from the state GIS office that the service is slowed due to increased demand (they're also hosting information related to the pandemic.) I think that may be why I sometimes don't get any image - I suspect the request times out - but I don't know whether that is impacting the color ramp display. And I'm using a state-wide image layer, so I've wondered whether some of the problem is that it's such a large data set. Can you try using a smaller source file? I know the issue began appearing well before the pandemic (so I don't think it's just that the data source is slow,) but it seems to have gotten progressively worse. I'm not sure we ever get the correct appearance any more. If I remember correctly, I did determine that sticking with the black to white default behaved as it should - but I have users that want to show it to clients and that gradation is not visually obvious enough.

Good luck, and if you figure anything out, I'd love to hear about it!

Greg

MichelleMestrovich1

I just got off a call with ESRI and showed them the behavior. I have an analyst working it. I think it might be a bug. Greg are you using Pro 2.5.2 to publish?

GregSpontak

No, this is a layer created in ArcGIS Online as a reference to the URL of an image service layer published by our state GIS office. And I have no idea what they used, but it was published in September 2018 so I don't think it was ArcGIS Pro 2.5. Here's the REST endpoint: gis dot arkansas period gov slash arcgis slash rest/services/ImageServices/DEM_1M_2018/ImageServer

Greg

SonomaMapAdministrator

ESRI has logged this as a BUG and is working on it.

BUG-000132637: The color ramp on an image service changes when scale is changed in ArcGIS Enterprise portal map viewer

DiegoGuidi

yep, and no updates about this issue

DJB

Has there been any updates on this issue. I'm experiencing the same behavior... four years later.

I would expect that the legend (Min / Max) updates when the map extents change.

The functionality that I am looking for works perfectly in ArcGIS Pro.

Is this kind of functionality even possible in ArcGIS Online?

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