smooth2d: Smooth the 2D data.table fields.

In nmcdev/nmcMetIO: Meteorological Data IO in NMC.

Description

该程序调用fields程序库对二维场进行平滑, 首先将离散点插值到nx,ny的网格点上, 如果输入场是等经纬度网格点, 也可看成离散点, 然后插值到(nx,ny)的格点上.之后 调用image.smooth进行平滑, theta控制平滑度, 值越大越平滑. 返回为data.table 数据, 以便于ggplot绘制图像.

Usage

smooth2d(x, y, z, theta = 0.03, nx = 128, ny = 128)

Arguments

x	: 1D vector, longitude.
y	: 1D vector, latitude.
z	: 1D vector,
theta	: the bandwidth or scale parameter, larger for smoother.
nx	: Number of grid point in X coordinate.
ny	: Number of grid points in Y coordinate.

Value

data.table, (x, y, z)

nmcdev/nmcMetIO documentation built on Jan. 30, 2022, 5:09 a.m.