rsaga.hillshade(RSAGA)
rsaga.hillshade()所属R语言包:RSAGA
Analytical hillshading
分析山体阴影
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Analytical hillshading calculation.
分析山体阴影计算。
用法----------Usage----------
rsaga.hillshade(in.dem, out.grid, method = "standard",
azimuth = 315, declination = 45, exaggeration = 4, ...)
参数----------Arguments----------
参数:in.dem
Input digital elevation model (DEM) as SAGA grid file (default extension: .sgrd).
输入数字高程模型(DEM)SAGA的网格文件(默认扩展名:.sgrd“)。
参数:out.grid
Output hillshading grid (SAGA grid file). Existing files will be overwritten!
山体阴影栅格输出(SAGA网格文件)。现有的文件将被覆盖!
参数:method
Available choices (character or numeric): "standard" (or 0 - default), "max90deg.standard" (1), "combined.shading" (2), "ray.tracing" (3). See Details.
可用的选择(字符或数字):"standard"(或0 - 默认值),"max90deg.standard"(1)"combined.shading"(2), "ray.tracing"(3)。查看详细信息。
参数:azimuth
Direction of the light source, measured in degree clockwise from the north direction; default 315, i.e. northwest.
度从正北方向顺时针测量的光源,默认315,即西北方向。
参数:declination
Declination of the light source, measured in degree above the horizon (default 45).
偏角的测量光源,在地平线以上学历(默认为45)。
参数:exaggeration
Vertical exaggeration of elevation (default: 4). The terrain exaggeration factor allows to increase the shading contrasts in flat areas.
垂直夸张的海拔高度(默认值:4)。地形夸张因子允许,增加在平坦区域的遮光对比。
参数:...
Optional arguments to be passed to rsaga.geoprocessor, including the env RSAGA geoprocessing environment.
可选参数被传递给rsaga.geoprocessor,包括env RSAGAGEO处理环境。
Details
详细信息----------Details----------
The Analytical Hillshading algorithm is based on
分析山体阴影算法是基于
值----------Value----------
The type of object returned depends on the intern argument passed to the rsaga.geoprocessor. For intern=FALSE it is a numerical error code (0: success), or otherwise (default)
返回的对象的类型取决于intern参数传递的rsaga.geoprocessor。对于intern=FALSE它是一个数字错误代码(0:成功),或以其他方式(默认)
注意----------Note----------
While the default azimuth of 315 degree (northwest) is not physically meaningful on the northern hemisphere, a northwesterly light source is required to properly depict relief in hillshading images. Physically correct southerly light sources results a hillshade that would be considered by most people as inverted: hills look like depressions, mountain chains like troughs.
虽然在北半球是不是物理意义上的默认方位角315度(西北),西北光源所需,正确描绘山体阴影图像的救济。物理上正确的南风光源导致的山体阴影,将被视为大多数人所为倒:看起来像槽的洼地,山脉丘陵。
This function uses module 0 from SAGA library ta_lighting.
此功能使用模块0,从的SAGA库ta_lighting。
(作者)----------Author(s)----------
Alexander Brenning (R interface), Olaf Conrad (SAGA module)
参见----------See Also----------
rsaga.solar.radiation, rsaga.insolation
rsaga.solar.radiation,rsaga.insolation
实例----------Examples----------
## Not run: rsaga.hillshade("dem.sgrd","hillshade")[#不运行:rsaga.hillshade(“dem.sgrd”,“山影”)]
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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