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Aspect raster every 30' ?

GalaNuñez

Hello,

I need to classify my Aspect raster every 0.5 degrees (30'). It's an Aspect raster of euclidean distance from a single point. The INT tool only provided me with 360 degree values, that is every 1º but I require more precision.

How can this be done?

Thank you

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GalaNuñez

Thanks for this suggestion. I tried something like this at some point but had so much trouble with erasing all the 'non-visible's from the 'visible's in the viewshed raster, I gave up. Also, the final graph needs to relate degrees with elevation points in meters.

I'm going to put up another thread explaining what I'm trying to work out. Thank you all for your help.

DarrenWiens2

Yes, this goes in Raster Calculator, although I think you want the following expression that will round to the nearest 0.5 (Int truncates, it doesn't round):

Int<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"aspect"</SPAN><SPAN class="operator token">*</SPAN><SPAN class="number token">2</SPAN><SPAN class="operator token">+</SPAN><SPAN class="number token">0.5</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="operator token">/</SPAN><SPAN class="number token">2.0</SPAN>‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

DanPatterson_Retired

why not take the outer boundary of a viewshed, convert it to a polyline and use it to extract the elevation profile?

GalaNuñez

Int(Aspect * 2)

Do I use the raster calculator for this?

GalaNuñez

I'm trying to create a table that relates elevation in a DEM with viewing angles from a single point. I need a realistic graph of the terrain in the horizon, but as it is now, with only 360 degrees, many details are lost. I'm using Zonal Statistics as Table tool to do this. Can you help me?

XanderBakker

You could do this: Int(Aspect * 2). However, just like Dan_Patterson‌ I am very curious to know why you want to obtain 720 classes...

DanPatterson_Retired

This is how aspect is calculated in ArcGIS Aspect—Help | ArcGIS Desktop and How Aspect works—Help | ArcGIS Desktop

If you don't want to use a finite difference method, could you elaborate on what it is you are going to use?

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