Version 1.2 of the Hemibrain dataset has been released. We suggest you familiarize yourself with the dataset and tools to access it through the initial discussion in our previous V1.0 and V1.1 release posts. This post provides updated links and descriptions.

neuPrint+ tools from FlyEM Team#

The neuPrint+ Explorer should be most visitors' first stop, and it has been updated with the V1.2 data and sports enhancements since June. We now designate the neuPrint ecosystem as neuPrint+ because we add intra-cellular interactions in addition to the inter-cellular data.

For programmatic access to the neuPrint+ database, see the neuprint-python library . For power-users who need access to the DVID database (see last section), you can try the neuclease.dvid python bindings.

This table differentiates each library based on the types of requests they support:

neuPrint tools from Collaborators#

Our collaborators have developed a nice ecosystem for neurodata analysis and visualization using the neuPrint connectome service. Some of their work can be seen in their tweet thread. Code for getting and using the data include the neuprintr R library, the hemibrainr R code tailored to this Hemibrain dataset, and the NAVis python library.

Downloads#

From the 26+ TB of data, we can generate a compact (44 MB) data model containing the following:

• Table of the neuron IDs, types, and instance names.
• Neuron-neuron connection table with synapse count between each pair.
• Same as above but each connection pair is split by ROI in which the synapses reside.

You can download all the data injected into neuPrint+ (excluding the 3D data and skeletons) in CSV format.

Neuroglancer Precomputed Data#

Here's a link to viewing the v1.2 dataset directly in your browser with Google's Neuroglancer web app.

The hemibrain EM data and proofread reconstruction is available at the Google Cloud Storage bucket gs://neuroglancer-janelia-flyem-hemibrain in the Neuroglancer precomputed format for interactive visualization with Neuroglancer and programmatic access using libraries like Cloudvolume (see below). You can also download the data directly using the Google gsutil tool (use the -m option, e.g., gsutil -m cp -r gs://bucket mydir for bulk transfers).

To parse the data, use one of the software libraries below or you'll have to write software to parse data using the format specification linked above.

Available data:#

• EM data
  • Original aligned stack (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/raw/jpeg JPEG format
  • CLAHE applied over YZ cross sections (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/clahe_yz/jpeg JPEG format
• Segmentation
  • Volumetric segmentation labels (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.2/segmentation Neuroglancer compressed segmentation format
• ROIs
  • Volumetric ROI labels (at 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.2/rois Neuroglancer compressed segmentation format
• Synapse detections
  • Indexed spatially and by pre-synaptic and post-synaptic cell id gs://neuroglancer-janelia-flyem-hemibrain/v1.2/synapses Neuroglancer annotation format
• Tissue type classifications
  • Volumetric labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/mask_normalized_round6 Neuroglancer compressed segmentation format
• Mitochondria detections
  • Voxelwise mitochondrion class labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.2/mito-classes Neuroglancer compressed segmentation format
  • Instance segmentation labels (at original 16x16x16nm resolution, as well as downsamplings and upsampling to 8nm) gs://neuroglancer-janelia-flyem-hemibrain/v1.2/mito-objects Neuroglancer compressed segmentation format
  • Relabeled instance segmentation, grouped by encompassing neuron ID (at original 16x16x16nm resolution, as well as downsamplings and upsampling to 8nm) gs://neuroglancer-janelia-flyem-hemibrain/v1.2/mito-objects-grouped Neuroglancer compressed segmentation format

Tensorstore#

Earlier this year, Google released a new library for efficiently reading and writing large multi-dimensional arrays. At this time, there are C++ and python APIs. An example of reading the hemibrain segmentation is in the Tensorstore documentation.

CloudVolume#

The Seung Lab's CloudVolume python client allows you to programmatically access Neuroglancer Precomputed data. CloudVolume currently handles Precomputed images (sharded and unsharded), skeletons (sharded and unsharded) and meshes (unsharded legacy format only). It doesn't handle annotations at the moment, which are usually handled by whatever proofreading system a given lab uses.

Full Datasets with DVID#

For those users who want to download and forge ahead on their own copy of our reconstruction data, we can provide a replica of our production DVID system and the full Hemibrain databases. Since we are in the process of modifying the underlying system, we suggest using one of the above approaches unless you require additional data or versions only available in the production databases. Please drop us a note if you would like access to the full data. The setup for a DVID replica is described on this page.

NeuTu#

NeuTu is a proofreading workhorse for the FlyEM team and can be used to proofread with DVID. It allows users to observe segmentation and to split or merge bodies if necessary. It also permits annotation, ROI creation, and many other features. Please visit this NeuTu documentation page for how to setup DVID with the Hemibrain dataset as described below.

Version 1.1 of the Hemibrain dataset has been released. We suggest you familiarize yourself with the dataset and tools to access it through the initial discussion in our previous V1.0 release post. This post provides updated links and descriptions.

neuPrint#

The neuPrint Explorer should be most visitors' first stop, and it has been updated with the V1.1 data and sports enhancements since last January.

For programmatic access to the neuPrint database, see the neuprint-python library. For power-users who need access to the DVID database (see last section), you can try the neuclease.dvid python bindings.

This table differentiates each library based on the types of requests they support:

Downloads#

From the 26+ TB of data, we can generate a compact (45.5 MB) data model containing the following:

• Table of the neuron IDs, types, and instance names.
• Neuron-neuron connection table with synapse count between each pair.
• Same as above but each connection pair is split by ROI in which the synapses reside.

You can download all the data injected into neuPrint (excluding the 3D data and skeletons) in CSV format.

Pending ... The skeletons of the 21,663 traced neurons are available as a tar file. Included is a CSV file traced-neurons.csv listing the instance and type of each traced body ID.

Neuroglancer Precomputed Data#

Here's a link to viewing the v1.1 dataset directly in your browser with Google's Neuroglancer web app.

The hemibrain EM data and proofread reconstruction is available at the Google Cloud Storage bucket gs://neuroglancer-janelia-flyem-hemibrain in the Neuroglancer precomputed format for interactive visualization with Neuroglancer and programmatic access using libraries like Cloudvolume (see below). You can also download the data directly using the Google gsutil tool (use the -m option, e.g., gsutil -m cp -r gs://bucket mydir for bulk transfers).

To parse the data, use one of the software libraries below or you'll have to write software to parse data using the format specification linked above.

Available data:#

• EM data
  • Original aligned stack (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/raw/jpeg JPEG format
  • CLAHE applied over YZ cross sections (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/clahe_yz/jpeg JPEG format
• Segmentation
  • Volumetric segmentation labels (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.1/segmentation Neuroglancer compressed segmentation format
• ROIs
  • Volumetric ROI labels (at 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.1/rois Neuroglancer compressed segmentation format
• Synapse detections
  • Indexed spatially and by pre-synaptic and post-synaptic cell id gs://neuroglancer-janelia-flyem-hemibrain/v1.1/synapses Neuroglancer annotation format
• Tissue type classifications
  • Volumetric labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/mask_normalized_round6 Neuroglancer compressed segmentation format
• Mitochondria detections
  • Volumetric labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/mito_20190717.27250582 Neuroglancer compressed segmentation format

Tensorstore#

Earlier this year, Google released a new library for efficiently reading and writing large multi-dimensional arrays. At this time, there are C++ and python APIs. An example of reading the hemibrain segmentation is in the Tensorstore documentation.

CloudVolume#

The Seung Lab's CloudVolume python client allows you to programmatically access Neuroglancer Precomputed data. CloudVolume currently handles Precomputed images (sharded and unsharded), skeletons (sharded and unsharded) and meshes (unsharded legacy format only). It doesn't handle annotations at the moment, which are usually handled by whatever proofreading system a given lab uses.

Full Datasets with DVID#

For those users who want to download and forge ahead on their own copy of our reconstruction data, you can download a replica of our production DVID system and the full Hemibrain databases.

You can quickly download a relatively small DVID executable which then allows access to grayscale data stored in the cloud, both in JPEG and raw format. All other data can be downloaded by type (e.g., synapses, ROIs, segmentation, etc.) so you can choose what you need.

Please refer to the Hemibrain DVID release page for download information. This is currently the v1.0 data but will be updated to the v1.1 data shortly.

Please drop us a note if you are running your own fork so we can keep you apprised of continuing work, documentation, and opportunities to push back your changes to the public server.

NeuTu#

NeuTu is a proofreading workhorse for the FlyEM team and can be used to proofread with DVID. It allows users to observe segmentation and to split or merge bodies if necessary. It also permits annotation, ROI creation, and many other features. Please visit this NeuTu documentation page for how to setup DVID with the Hemibrain dataset as described below.

Welcome to the opening of the dvid.io website and the release of the Hemibrain dataset!

For the first blog post, I'll oddly tell you all the ways you can access the dataset without DVID, and end the post with how you can setup your own DVID installation. The full Hemibrain DVID dataset is composed of the grayscale image volume (34431 x 39743 x 41407 voxels kept in the cloud) with approximately another two terabytes of local data generated as part of the reconstruction process. (See Data Management in Connectomics for a blog post on how we manage data.)

DVID was the central database for 50+ users, managing many versions of data throughout the connectome construction including:

• segmentation: supervoxel identifiers per voxel and their mapping to neuron body IDs
• regions of interest (ROIs) like the Mushroom Body
• meshes (ROIs, supervoxels, and neurons)
• neuron skeletons
• synapses and info to rapidly get synapse counts for any body
• cell/label information
• proofreader assignments for various protocols
• bookmarks (3d point annotations)
• various classifications of volume like mitochondria
• miscellaneous data stored in versioned files

Here's where DVID fits into the reconstruction workflow:

There's a lot of data and much of it may be irrelevant to a biologist trying to understand the Connectome of the Adult Drosophila Central Brain. For our research at Janelia, DVID ideally fades into the background and most of what users see are connectomics-focused applications like neuPrint, NeuTu, and Neuroglancer, which is actually embedded in other apps as well. All these connectomics-focused apps use DVID as a backend although Neuroglancer can use a number of backends and can be optimized for particular versions of data (like the Hemibrain dataset snapshot at its release) via its "precomputed" storage format.

Let's briefly cover the various ways you can download or interact with the newly released data.

neuPrint#

The first obvious stop is the neuPrint Hemibrain website. It's a nice web interface to query and visualize the released connectomics data without having to download anything locally.

Downloads#

From the 26+ TB of data, we can generate a compact (25 MB) data model containing the adjacency matrix. We annotate brain region information for each connection to make the model richer.

You can download all the data injected into neuPrint (excluding the 3D data and skeletons) in CSV format.

The skeletons of the 21,663 traced neurons are available as a tar file. Included is a CSV file traced-neurons.csv listing the instance and type of each traced body ID.

Neuroglancer#

Our great collaborators at Google have not only produced exceptional automatic neuron segmentation to guide our proofreading, but the Neuroglancer web app has become a fixture in the connectomics community. Jeremy Maitin-Shepard has enhanced his Neuroglancer tool for this Hemibrain data release. Here's a link to viewing the dataset directly in your browser.

The hemibrain EM data and proofread reconstruction is available at the Google Cloud Storage bucket gs://neuroglancer-janelia-flyem-hemibrain in the Neuroglancer precomputed format for interactive visualization with Neuroglancer and programmatic access using libraries like Cloudvolume (see below). You can also download the data directly using the Google gsutil tool (use the -m option, e.g., gsutil -m cp -r gs://bucket mydir for bulk transfers).

Available data:

• EM data
  • Original aligned stack (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/raw/jpeg JPEG format
  • CLAHE applied over YZ cross sections (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/emdata/clahe_yz/jpeg JPEG format
• Segmentation
  • Volumetric segmentation labels (at original 8x8x8nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.0/segmentation Neuroglancer compressed segmentation format
• ROIs
  • Volumetric ROI labels (at 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/v1.0/rois Neuroglancer compressed segmentation format
• Tissue type classifications
  • Volumetric labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/mask_normalized_round6 Neuroglancer compressed segmentation format
• Mitochondria detections
  • Volumetric labels (at original 16x16x16nm resolution, as well as downsamplings) gs://neuroglancer-janelia-flyem-hemibrain/mito_20190717.27250582 Neuroglancer compressed segmentation format
• Synapse detections
  • Indexed spatially and by pre-synaptic and post-synaptic cell id gs://neuroglancer-janelia-flyem-hemibrain/v1.0/synapses Neuroglancer annotation format

Tensorstore (Added 2020-04-03)#

Google just released a new library for efficiently reading and writing large multi-dimensional arrays. At this time, there are C++ and python APIs. An example of reading the hemibrain segmentation is in the Tensorstore documentation.

CloudVolume#

The Seung Lab's CloudVolume python client allows you to programmatically access Neuroglancer Precomputed data. CloudVolume currently handles Precomputed images (sharded and unsharded), skeletons (sharded and unsharded) and meshes (unsharded legacy format only). It doesn't handle annotations at the moment, which are usually handled by whatever proofreading system a given lab uses.

NeuTu#

NeuTu is a proofreading workhorse for the FlyEM team. It allows users to observe segmentation and to split or merge bodies if necessary. It also permits annotation, ROI creation, and many other features. Please visit this NeuTu documentation page for how to setup DVID with the Hemibrain dataset as described below.

Full Datasets with DVID#

For those users who want to download and forge ahead on their own copy of our reconstruction data, you can download a replica of our production DVID system and the full Hemibrain databases.

<Clarification added 2020-03-24> You can quickly download a relatively small DVID executable which then allows access to grayscale data stored in the cloud, both in JPEG and raw format. All other data can be downloaded by type (e.g., synapses, ROIs, segmentation, etc.) so you can choose what you need.

Please refer to the Hemibrain DVID release page for download information.

We'll be updating the documentation on this website over time.
Please drop us a note if you are running your own fork so we can keep you apprised of continuing work, documentation, and opportunities to push back your changes to the public server.