Provides tools to move between adult brain EM and light level data, emphasising the interaction between the CATMAID web application and the R Neuroanatomy Toolbox package. See also, from which this package borrows a name and which was used to define the landmark data sets that provide a bridge between the FAFB EM brain and light level template.

Quick Start

For the impatient …

# install
if (!require("devtools")) install.packages("devtools") 

# use

# run examples 

# get overview help for package 

# help for functions/data 


Currently there isn’t a released version on CRAN.

Development version

You can use the devtools package to install the development version:

if (!require("devtools")) install.packages("devtools")

# to transform skeletons to template brains other than JFRC2013, you also need
# a CMTK installation (see
# and to download some additional bridging registrations.

Note that this should also install the latest version of the necessary dependencies. To carry out nblast comparisons with neurons, you may need to install optional dependencies by installing as follows:

devtools::install_github("jefferis/elmr", dependencies=TRUE)

Note: Windows users need Rtools and devtools to install this way.


elmr and its dependencies are still under fairly heavy development. You can conveniently bring the devlopment versions up to date by doing:

devtools::update_packages("elmr", dependencies = TRUE)


  • elmr is part of a suite of R packages based on the NeuroAnatomy Toolbox

  • The approach to transforming data between template brains is descibed in

Combining genome-scale Drosophila 3D neuroanatomical data by bridging template brains James D. Manton, Aaron D. Ostrovsky, Lea Goetz, Marta Costa, Torsten Rohlfing, Gregory S. X. E. Jefferis. bioRxiv 006353; doi: 10.1101/006353

  • The elm tool originally used to define landmarks is in turn based on BigWarp:

JA Bogovic, P Hanslovsky, A Wong, S Saalfeld, “Robust registration of calcium images by learned contrast synthesis”, In Biomedical Imaging (ISBI), 2016 IEEE 13th International Symposium on, 1123-1126, DOI: 10.1109/ISBI.2016.7493463.

  • Finally, the FAFB EM dataset is described in:

A Complete Electron Microscopy Volume Of The Brain Of Adult Drosophila melanogaster Zhihao Zheng, J. Scott Lauritzen, Eric Perlman, Camenzind G. Robinson, Matthew Nichols, Daniel Milkie, Omar Torrens, John Price, Corey B. Fisher, Nadiya Sharifi, Steven A. Calle-Schuler, Lucia Kmecova, Iqbal J. Ali, Bill Karsh, Eric T. Trautman, John Bogovic, Philipp Hanslovsky, Gregory S. X. E. Jefferis, Michael Kazhdan, Khaled Khairy, Stephan Saalfeld, Richard D. Fetter, Davi D. Bock bioRxiv 140905; doi: 10.1101/140905