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Hello, This all started because I used the sun shadow volume tool, but I didn't like how the shadow enveloped the buildings. I want to the be able to see the buildings separate from their shadow. I'm trying to recreate the type of analysis seen here. I downloaded the tutorial, but when I looked at the Skyline parameters, the box it says to check under Surface Options, "Use Refraction," is grayed out so that I can't check it. Since the point is to create silhouettes instead of a skyline, I checked the box "Create Silhouettes" under Skyline Options instead. I left everything else alone and clicked apply and ok. I validated the model and ran it, getting the following error: === Executing (Create Sun Skymap): SunSkymap Buildings "(UTC-6:00) Central Time (US & Canada), Central America, Guadalajara, Mexico City" "3/21/2010 11:00:00 AM" # # # # # "C:\Users\Chase\Desktop\Shadows\Maps and GDBs\Shadows.gdb\Buildings_Sun" 7500 0 Start Time: Sun Jun 15 08:49:36 2014 Running script SunSkymap... Traceback (most recent call last): File "C:\Users\Chase\Desktop\Shadows\Maps and GDBs\Sun_tools\ClassSunSkyMap.py", line 15, in <module> import arcpy, ephem File "C:\Users\Chase\Desktop\Shadows\Maps and GDBs\Sun_tools\ephem\__init__.py", line 5, in <module> import ephem._libastro as _libastro File "C:\Users\Chase\Desktop\Shadows\Maps and GDBs\Sun_tools\ephem\_libastro.py", line 1 SyntaxError: Non-ASCII character '\x90' in file C:\Users\Chase\Desktop\Shadows\Maps and GDBs\Sun_tools\ephem\_libastro.py on line 1, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details Failed to execute (Create Sun Skymap). Failed at Sun Jun 15 08:49:38 2014 (Elapsed Time: 2.00 seconds) === Does anyone know why this is happening? I downloaded Python 2.6 as well as PyEphem.
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06-15-2014
06:21 AM
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I'm working on a similar project and I might have a solution, depending on your topography. I am working in a relatively flat area, so I deleted the elevation column from my building attribute table. I then added an aerial raster so that the buildings sat right on it, then ran the sun shadow volume tool. The shadows cut through the aerial, but looking at it from above, it looks accurate enough. Maybe you can create a footprint from that? What tool are you using for that step, btw?
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06-14-2014
04:16 AM
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Thanks for responding! I'm not sure I understand you. I need to basically draw a line from the housing project to the bus stop using the sidewalk network. This is related to a concern that there are gaps in the network so that even though a development is within a 1/4 mi. buffer from the bus stop (as the crow flies), it isn't actually accessible because it takes considerably longer to get there by using the street network, there are no sidewalks, etc.
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05-09-2014
08:42 AM
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Hello, how can I map whether housing projects are within 1/4 mi. from a bus stop on a sidewalk network? I'm having trouble just getting started on this. Any guidance would be appreciated. Thanks, Chase
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05-09-2014
08:10 AM
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