[R-sig-Geo] Combining different RasterBricks maintaining z-values (dates)

[J Rojo]

Great!
It works as I needed
Thank you!
Jesús

El 30 nov 2019, a las 0:37, Stephen Stewart <stephen.stewart85 using gmail.com<mailto:stephen.stewart85 using gmail.com>> escribió:

Hi Jesús,

You can use the getZ and setZ functions in the raster package to extract and then reassign Z values.

> rain = brick("C:/Users/sbste/Downloads/2000.monthly_rain.nc<http://2000.monthly_rain.nc/>")
> rain_z = getZ(rain)
>
> rain_x2 = stack(rain,rain)
> getZ(rain_x2)
NULL
> rain_x2 = setZ(rain_x2,c(rain_z,rain_z),name = "Date")
> rain_x2
class      : RasterStack
dimensions : 681, 841, 572721, 24  (nrow, ncol, ncell, nlayers)
resolution : 0.05, 0.05  (x, y)
extent     : 111.975, 154.025, -44.025, -9.975  (xmin, xmax, ymin, ymax)
crs        : +proj=longlat +datum=WGS84
names      : X2000.01.16.1, X2000.02.15.1, X2000.03.16.1, X2000.04.16.1, X2000.05.16.1, X2000.06.16.1, X2000.07.16.1, X2000.08.16.1, X2000.09.16.1, X2000.10.16.1, X2000.11.16.1, X2000.12.16.1, X2000.01.16.2, X2000.02.15.2, X2000.03.16.2, ...
Date        : 2000-01-16 - 2000-12-16 (range)

Cheers,

Steve

On Sat, 30 Nov 2019 at 10:06, J Rojo <jru85yebe using hotmail.com<mailto:jru85yebe using hotmail.com>> wrote:
Hi everyone
I am trying to combine different RasterBricks into one and if use the function ‘brick’ does not work, and with ‘stack’ remove the z-values as RasterStack does not include it.
The objective is to do a loop for reading and processing one nc file for each iterative step, and include each Brick into a big general Brick
One example with two RasterBricks

> a <- brick("tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM_2020.nc”); a

class      : RasterBrick
dimensions : 720, 1440, 1036800, 366  (nrow, ncol, ncell, nlayers)
resolution : 0.25, 0.25  (x, y)
extent     : 0, 360, -90, 90  (xmin, xmax, ymin, ymax)
crs        : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
source     : /Volumes/Copy/NASA/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM_2020.nc
names      : X2020.01.01, X2020.01.02, X2020.01.03, X2020.01.04, X2020.01.05, X2020.01.06, X2020.01.07, X2020.01.08, X2020.01.09, X2020.01.10, X2020.01.11, X2020.01.12, X2020.01.13, X2020.01.14, X2020.01.15, ...
Date       : 2020-01-01, 2020-12-31 (min, max)
varname    : tasmax

> b <- brick("tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM_2021.nc”); b

class      : RasterBrick
dimensions : 720, 1440, 1036800, 365  (nrow, ncol, ncell, nlayers)
resolution : 0.25, 0.25  (x, y)
extent     : 0, 360, -90, 90  (xmin, xmax, ymin, ymax)
crs        : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
source     : /Volumes/Copy/NASA/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM/tasmax_day_BCSD_rcp45_r1i1p1_MIROC-ESM-CHEM_2021.nc
names      : X2021.01.01, X2021.01.02, X2021.01.03, X2021.01.04, X2021.01.05, X2021.01.06, X2021.01.07, X2021.01.08, X2021.01.09, X2021.01.10, X2021.01.11, X2021.01.12, X2021.01.13, X2021.01.14, X2021.01.15, ...
Date       : 2021-01-01, 2021-12-31 (min, max)
varname    : tasmax

## Now I would like to combine both RasterBrick into one big RasterBrick with 731 layer, maintaining the Date as z-value
> c <- stack(a, b) # If I do a ‘stack’ z-value is not considered
> c <- brick(a, b) # If I do a ‘brick’ does not work and the file when saved is very weighted, and any case z-value is not maintained

Any idea about how I can combine in easy way the layers for multiple bricks according to the z-value
I am grateful any help, thank you so much

Jesús Rojo



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