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Creating a Hillshade from Mosaic DEM

MikeMichalek

I am having problems creating a Hillshade from a mosaic DEM I made with 10m USGS seamless data DEM's. I go to the Spatial Analyst tool "Hillshade" and create the new hillshade layer, but the output is a grey screen in which you can view lines where the individual USGS DEM's boundaries were, not a hillshade. I was wondering if anyone knew what I could do to fix this.

(Screen Captures Attached)

Thanks,

Mike

MosaicDEMProb.jpg

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FerasObeidat

Hi,

Is it possible to run Hillshade Function on local image ?

Thanks,

JeffreySwain

Mike,

The functions that Eric is mentioning are functions after you create a Mosaic Dataset. They are not in ArcToolbox, but are available under the Function Tab when viewing the properties of Mosaic Datasets in ArcCatalog or the ArcCatalog Window.

MikeMichalek

Eric,

Is there a different ArcTollbox function for the shaded relief function? If so could you please direct me to it. I know that you can create a 'color' hillshade by changing the transparency % and allowing the DEM to blend through.

Thanks,

Mike

EricRice

Mike,

Hillshade is black and white. Shaded Relief is a colored hillshade basically.

Eric

MikeMichalek

What is the difference between a Hillshade Shade & Shaded Relief Function?

Thanks for the help,

Mike

EricRice

It sounds like you need to apply the Shaded Relief Function instead of the Hillshade Function on your mosaic dataset.

-Eric

MikeMichalek

Thanks for the input guys but I am still having difficulties. In the past I created/used a Hillshade layer behind a DEM (with a sent transparency %). Using the Hillshade option within the DEM Mosaic itself produces a different look than I'd prefer (a separate hillshade file). **You can see the difference in the attachment**

I guess what I am asking now;
Does anyone know how I can produce a Hillshade output using the Mosaic DEM, without getting the grey output?

Or can I use the Hillshade effect in the Mosaic DEM as suggested, but somehow manipulate it to produce the same thing as a DEM set with a transparency and Hillshade behind? If so, what steps would I have to take to get this function to produce what I desire? Mess with the Z Factor, ect.?

Thanks for the help,

Mike

MosaicQuestion.jpg

EricRice

Mike,

I see that you're working with a mosaic dataset. Is there a reason you want to output a hillshade to disk, which requires storage? You can simply add the Hillshade function to your mosaic dataset and the system will generate a hillshade on the fly. As recent as this week I outlined how to add the hillshade function to a mosaic dataset containing elevation data. You can review step by step here: http://forums.arcgis.com/threads/51137-Hillshade-coming-out-totally-wrong

Regards,
Eric

DanPatterson_Retired

Is the mosaic projected so that the x, y and z values have the same units? If not, mosaic, project the dem, then hillshade. You may have to exaggerate the z factor if the elevation difference isn't very much relative to the x/y extent

JoeFlannery

Mike:

Have you run Statistics on your DEM mosaic?
Also, you can "Symbolize" your DEM for hillshade.
>Layer Properties >Symbology tab >check on "Use hillshade effect"

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