Friday, November 20, 2015

lab 7 Working Rasters

Rasters:

Extensions: Spatial Analysis (added toolbar for easy access)
Introduced Raster calculator (Spatial Analyst Tools>Map Algebra>Raster Calculator

Raster Calculator>environments>Processing extent/Raster Analysis: allow to select area that the calculator will focus.

Selected the Dem 30 which after the Calculator was converted into rastercal 1 (see below)

Wanted to add in road data (UWroad_clip) and used selection tool to select "Type_L"=  'Rd' and "Type_L" = "Blvd" then used analysis Tools>overlay>intersect with Studyarea similar to lab6 for practice and to follow closer to the clips in the power point


Selection shows designated area selected by the view of the window

Next selection >Raster calc>enviroments>raster analysis allowing to select a specific feature, was not sure of the selection that it made. Did not quite remeber this from class and without more information created a selection but not sure how it differed. Played around with it setting the Maximum inputs with the mask of layer 3. Selection the same as seen above. though I am not quite sure how to interpret the difference. 

>spatial analysis>surface>hillshade: input raster rastercalc5 created above with stretched symbology overlayed over the intersect clip created earlier. 


Took selection and converted into an ASPECT (>spacial analysis tools>surface>Aspect) input raster the hillshade created earlier. 
Using the raster calculator and sin("aspect_hills1" * 3.1459/180) using basic numerical functions. (note: resuls look much like the hillshade effect 


Results gave a depth to the map though i honestly do not understand all the conversions just need more time working with them. Basic understanding is useful though. I understand though it is useful for highlighting and area and bringing and individuals attention to an important area but leaving surrounding information available for reference. 




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