Raster_AspectService
This service involves to compute aspect from a raster map layer of true elevation values.
Operation:
aspect - Generate raster map layer of aspect derivative from a raster map layer of true elevation values. Aspect is calculated counterclockwise from east.
The aspect output raster map indicates the direction that slopes are facing. The aspect categories represent the number degrees of east. Category and color table files are also generated for the aspect map layer. The aspect categories represent the number degrees of east and they increase counterclockwise: 90deg is North, 180 is West, 270 is South 360 is East. The aspect value 0 is used to indicate undefined aspect in flat areas with slope=0. The operation is based on GRASS raster command r.slope.aspect.
Request Parameters:
- sourceURL
- URL of input raster elevation file
- Default format: GeoTIFF
- prec
- Type of output aspect map
- Parameter format: string
- Options: double, float, int
- Default: float
- zfactor
- Multiplicative factor to convert elevation units to meters
- Parameter format: float
- Default: 1.0
- min_slope_allowed
- Minimum slope value. (in percent) for which aspect is computed. Because most cells with a very small slope end up having category 0, 45, ..., 360, it is sometimes possible to reduce the bias in these directions by filtering out the aspect in areas where the terrain is almost flat. A new option min_slp_allowed was added to specify the minimum slope for which aspect is computed. The aspect for all cells with slope (min_slp_allowed) is set to null.
- Parameter format: float
- Default: 0.0
- outputGeoTiffType
- Type of output GeoTIFF file. The output Format Type is specified as GeoTIFF
- Parameter format: string
- Options: Byte, Int16, UInt16, UInt32, Int32, Float32, Float64, CInt16, CInt32, CFloat32, CFloat64
Response Parameters:
- returnURL
- URL of output aspect file
- returnFormat
- Format of output aspect file
- Default: GeoTIFF
For further informations
ServiceLocation
WSDL
JavaInterface
See also GRASS command
r.slope.aspect
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