Raster_OpennessCalculationService
This service could be used to derive the openness from DEM data.
Openness is a new concept of surface representation. It is a novel method for digital terrain modelingactually an image-processing technique-by which values of surface openness are calculated from a DEM, displayed in map form, and used to visualize landscapes. The resulting maps of openness superficially resemble digital images of shaded relief or slope angle, but emphasize dominant surface concavities and convexities. Values of openness require no light source, thus removing one limitation of relief shading, and are less affected by the DEM noise that afflicts most other parameters. (Ryuzo Yokoyama, Mlchlo Shlrasawa, and Richard J. Pike, 2002)
Operation:
openness - Allow the user to calculate the openness from a DEM.
Request Parameters:
- sourceURL
- URL of input raster elevation file
- Default format: GeoTIFF
- scale
- Spatial scale in # of cells
- Parameter format: Integer
- Default: 1
- zunit
- Vertical unit
- Parameter format: string
- Options: m, ft
- m: Vertical unit will be meter. If the zunit is meter, the scale will be 1
- ft: Vertical unit will be feet. If the zunit is feet, the scale will be set to 0.3048
- Default: m
- 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
- Default: Byte
Response Parameters:
- phiReturnURL
- URL of output raster map containing the positive openness.
- psiReturnURL
- URL of output raster map containing the negative openness.
- phiReturnFormat
- Format of output raster map containing the positive openness.
- Default: GeoTIFF
- psiReturnFormat
- Format of output raster map containing the negative openness.
- Default: GeoTIFF
For further informations
ServiceLocation
WSDL
JavaInterface
See also
Ryuzo Yokoyama, Mlchlo Shlrasawa, and Richard J. Pike, 2002. “Visualizing Topography by Openness: A New Application of Image Processing to Digital Elevation Models.”Photogrammetric Engineering & Remote Sensing, March 2002, p257-265. See at http://www.asprs.org/publications/pers/2002journal/march/2002_mar_257-265.pdf.
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