All Questions
Tagged with aspect spatial-analyst
7 questions
7
votes
1
answer
2k
views
What is the "57.29578" that ArcGIS uses in Aspect calculation?
ArcGIS Desktop Help on How Aspect works explains the calculations used, but introduces the for me magic number of 57.29578:
aspect = 57.29578 * atan2 ([dz/dy], -[dz/dx])
Where does this number come ...
- 435
6
votes
1
answer
3k
views
Understanding aspect units in QGIS
I created an aspect raster form a DEM raster in QGIS 2.14, and got this results:
I know that the results refer to degree units , but still i don't understand how to read the map result- i mean to ...
- 4,082
4
votes
1
answer
1k
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What is the difference between Aspect and Flow Direction tools?
There are two seemingly identical Spatial Analysis tools:
(1) Surface -> Aspect:
Derives aspect from a raster surface. The aspect identifies the
downslope direction of the maximum rate of change ...
- 223
1
vote
2
answers
405
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How to find out the density or percentage of vegetation in each aspect
I am trying to find out what is controlling vegetation in an area of Saudi Arabia for my masters project and I am currently focusing on the aspect of slopes in the area.
I have a DEM layer and I have ...
- 27
0
votes
0
answers
12
views
Aspect function creates blank file [duplicate]
I am trying to make get aspect from an elevation file but the code keeps making a blank file
import arcpy, os
from arcpy import env
from arcpy.sa import *
env.overwriteOutput = True
elevation = r&...
0
votes
0
answers
114
views
Aspect function creating empty raster using ArcPy
I am trying to derive the aspect from an elevation file. When I run the function it creates a new file but the file is empty. my code:
import arcpy, os
from arcpy import env
from arcpy.sa import *
env....
0
votes
1
answer
93
views
Calculating area of pixles for certain Aspect value per specific area?
I am using ArcGIS 10.6. I have the aspect (raster file) for the roof of buildings at the city scale. Now I want to calculate the area of each aspect group per building. I tied zonal statistics, zonal ...
- 19