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Because the feature data files are compressed, you may need to uncompress them into JSON-formatted text files, depending on your need. The compression used is bzip2. If you are using the files with the HTRC Feature Reader, the library will deal with the compression automatically.
Workset Builder 2.0
Extracted Features files can also be downloaded for search results in Workset Builder 2.0. First, enter search terms for a desired set of volumes. Once results are returned, apply any filtering for the results to remove any volumes for which you do not want Extracted Features files. Once your result set includes all of the volumes you'd like Extracted Features files for, click "JSON Extracted Features (ZIP)" under the "Export Search Results" heading at the top of the left sidebar:
Clicking this link will start a download of the Extracted Features files for all volumes in your results. Since this process is fetching and compressing files, and result sets can be large, it may take a few moments to start and finish your download.
Alternatively, you can download Extracted Features files for individual volumes by following the same steps as above, and then clicking the "Download Extracted Features (complete volume)" link under each desired volume in the search results:
This will download uncompressed Extracted Features for the given volume, in JSON.