Raster Stackの計算

R

Githubにて。 https://github.com/naru-T/Rscripts/blob/master/raster_calc_function.mdもうちょっとmarkdownの書き方べんきょうせねば。

2016-12-16

try user-defined function approach

this does not necessary to prepare large amount of RAM.```{r} na_func x[x return(as.vector(x)) }stk system.time(ans summary(ans) ``` user system elapsed 10.585 0.254 10.898 #### calculation for temporal interpolating NA values in raster st…

2016-12-16

try normal approach

this approach depends on RAM. it is only faster when using smaller raster data. Do not try this way if you use big raster data.```{r} system.time(stk[stk summary(stk) ``````{r} system.time(stk[stk summary(stk) ``` user system elapsed 0.984…

2016-12-16

set up raster stack

```{r} library(raster) r r1 r2 r3 r4 r5 r6 stk ```

2016-12-16

try user-defined function approach

this does not necessary to prepare large amount of RAM.```{r} na_func x[x return(as.vector(x)) }stk system.time(ans summary(ans) ``` user system elapsed 10.585 0.254 10.898 #### calculation for temporal interpolating NA values in raster st…

2016-12-16

try normal approach

this approach depends on RAM. it is only faster when using smaller raster data. Do not try this way if you use big raster data.```{r} system.time(stk[stk summary(stk) ``````{r} system.time(stk[stk summary(stk) ``` user system elapsed 0.984…