[R-sig-Geo] rasterVis, multiple plots and scalebar labels

[Ben Tupper]

Hi Melanie,

Thanks for this.  I tried that approach by adding layers with the latticeExtra package - no joy yet.  My lattice skills are a bit wobbly - but I have The Good Books in hand so I'll keep noodling around and may prevail yet.

https://www.r-project.org/doc/bib/R-books_bib.html#R:Sarkar:2008
https://www.r-project.org/doc/bib/R-books_bib.html#R:Bivand+Pebesma+Gomez-Rubio:2008
http://oscarperpinan.github.io/spacetime-vis/

Cheers,
Ben

> On Sep 23, 2016, at 12:55 PM, Bacou, Melanie <mel at mbacou.com> wrote:
> 
> Here is a stump that might also work with levelplot():
> 
> # Plot raster with no scalebar first
> raster::plot(r, col=vector_of_colors, legend=FALSE, axes=FALSE)
> 
> # Add a custom scalebar
> raster::plot(r, legend.only=TRUE,
>  col=vector_of_colors,
>  axis.args=list(at=1:length(vector_of_labels), labels=vector_of_labels)
> 
> 
> On 9/23/2016 12:11 PM, Ben Tupper wrote:
>> Hi,
>> 
>> I would like to specify the labels drawn on the scalebar for a multi-raster plot.  I have seen this exchange (and try to replicate for multiple rasters below)
>> 
>> https://stat.ethz.ch/pipermail/r-help/2011-August/286705.html
>> 
>> I can't make that work with rasterVis::levelplot()
>> 
>> # start preparatory
>> library(raster)
>> library(rasterVis)
>> 
>> x <- raster::raster(volcano,
>> 	crs = '+proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0',
>> 	xmn = -45, xmx = -40, ymn = 39, ymx = 47)
>> xx <- addLayer(x,x,x)
>> 
>> at <- seq(90, 200, length = 10)
>> labels <- rep(" ", length(at))
>> labels[1] <- "low"
>> labels[length(labels)] <- "high"
>> # end preparatory
>> 
>> # try as in help exchange above - ticks are labeled with numerics
>> rasterVis::levelplot(xx,
>>      colorkey = list(at = at),
>>      labels = list(labels = labels, at = at) )
>> 
>> # try as described in ?rasterVis::levelplot section for labels
>> # ticks still labeled with numerics
>> rasterVis::levelplot(xx,
>> 	at = at,
>>  	labels = labels )
>> 
>> I'm stumped!  How do I control the tick labels on a scalebar?
>> 
>> Thanks!
>> Ben
>> 
>> 
>>> sessionInfo()
>> R version 3.3.1 (2016-06-21)
>> Platform: x86_64-apple-darwin13.4.0 (64-bit)
>> Running under: OS X 10.11.6 (El Capitan)
>> 
>> locale:
>> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>> 
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>> 
>> other attached packages:
>> [1] rasterVis_0.40      latticeExtra_0.6-28 RColorBrewer_1.1-2  lattice_0.20-33
>> [5] raster_2.5-8        sp_1.2-3
>> 
>> loaded via a namespace (and not attached):
>> [1] zoo_1.7-13        rgdal_1.1-10      parallel_3.3.1    hexbin_1.27.1
>> [5] Rcpp_0.12.6       grid_3.3.1        viridisLite_0.1.3
>> 
>> 
>> Ben Tupper
>> Bigelow Laboratory for Ocean Sciences
>> 60 Bigelow Drive, P.O. Box 380
>> East Boothbay, Maine 04544
>> http://www.bigelow.org
>> 
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> 

Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org