Aspect Tool ArcMap

Aspect Tool, Raster Surface Toolset, 3D Analyst ArcToolbox
Summary
Derives the aspect from each cell of a raster surface.

The aspect identifies the compass direction that the downhill slope faces for each location
Usage
This tool uses a 3 by 3 cell moving window to process the data. If the processing cell is NoData, the output for that location will be NoData.

Of the eight cells neighboring the processing cell, this tool requires that at least seven of them have a valid value. If there are fewer than seven valid cells, the calculation will not be performed, and the output at that processing cell will be NoData.

The cells in the outermost rows and columns of the output raster will be NoData. This is because along the boundary of the input dataset, those cells do not have enough valid neighbors.

Aspect is expressed in positive degrees from 0 to 360, measured clockwise from north.

Cells in the input raster that are flat—with zero slope—are assigned an aspect of -1.

For the geodesic method, specifying the surface z-unit is important to ensure the accuracy of the output. The Z unit parameter will be enabled only when the geodesic method is selected.

If a z-unit is available in the vertical coordinate system of the input raster, it will be applied automatically. It is suggested that you define a z-unit for the input raster if it is missing. You can use the Define Projection tool to specify a z-unit. If it is undefined, meter will be used by default.

The Project geodesic azimuths (project_geodesic_azimuths in Python) parameter is available only when the Method parameter is set to Geodesic.

For the Geodesic method, if the Project geodesic azimuths parameter is checked (project_geodesic_azimuths is set to PROJECT_GEODESIC_AZIMUTHS in Python), the following are true:

North is always represented by 360 degrees.
Azimuths will be projected to correct the distortion caused by a nonconformal Output Coordinate System. These angles can be used to accurately locate points along the steepest downhill slope.
When the input raster needs to be resampled, the bilinear technique will be used. An example of when an input raster may be resampled is when the output coordinate system, extent, or cell size is different from that of the input.

This tool can be graphics processing unit (GPU) accelerated when calculating geodesic aspect. This means that if a GPU device is available on your system, it can be used to improve the performance of the geodesic method.

More information on how to configure your GPU device is available in the Spatial Analyst extension help in the GPU processing with Spatial Analyst help topic.
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