river(topmodel)
river()所属R语言包:topmodel
Identification of rivers in a digital elevation model
数字高程模型在河流鉴定
译者:生物统计家园网 机器人LoveR
描述----------Description----------
This function identifies river headwater cells based on threshold values in a topographic index and accumulated area river (generated using topidx. Rivers are then traced downslope using a single flow algorithm.
此功能可识别上游单元阈值的基础上,在地形指数和累计面积河流(使用,然后跟踪topidx。河流下坡使用单流算法的产生。
用法----------Usage----------
river(DEM,atb,area,res,thatb,tharea)
参数----------Arguments----------
参数:DEM
A matrix representing a digital elevation model [m] with equally sized pixels and equal NS and EW resolution
一个矩阵[M]与同样大小的像素和平等的NS和EW分辨率的数字高程模型
参数:atb
Matrix with topographic index values generated by topidx
矩阵与地形指数值所产生的topidx
参数:area
Matrix with drainage area values generated by topidx
矩阵与流域面积值所产生的topidx
参数:res
Resolution of the digital elevation model (m)
分辨率的数字高程模型(M)
参数:thatb
A topographic index threshold for headwater cells
河源单元的地形指数阈值
参数:tharea
A drainage threshold for headwater cells
河源单元的排水阈值
Details
详细信息----------Details----------
Cells that exceed thatb or tharea in the respective maps are identified as headwater cells. The routine then traces down rivers from these cells based on a D8 algorithm and calculates the distance towards the outlet. Outlets are recognized by sinks, map borders or excluded areas (NA). The subcatch function can be used to set areas outside the target catchment to NA.
被认定为河源单元的单元,在各自的图超过thatb或tharea的。然后程序跟踪河流从这些单元在D8算法计算对出口的距离。奥特莱斯是公认的水槽,图的边界或排除区域(NA)。 subcatch功能,可用于设置目标集水区以外的区域,以NA。
值----------Value----------
A matrix of the same size as DEM.
的矩阵的大小相同的DEM。
(作者)----------Author(s)----------
Wouter Buytaert, Imperial College London, based on an implementation from the Hydrology Group of Lancaster University
参考文献----------References----------
<h3>See Also</h3>
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
注1:为了方便大家学习,本文档为生物统计家园网机器人LoveR翻译而成,仅供个人R语言学习参考使用,生物统计家园保留版权。
注2:由于是机器人自动翻译,难免有不准确之处,使用时仔细对照中、英文内容进行反复理解,可以帮助R语言的学习。
注3:如遇到不准确之处,请在本贴的后面进行回帖,我们会逐渐进行修订。
|