PCL --visualize capability of the pdal command line application has been removed.
writer.derivative has been removed. Use gdaldem for faster and more featureful equivalent functionality.
GeoTIFF and Proj.4 are now required dependencies.
writers.p2g has been removed. It was replaced by writers.gdal in 1.4, but the P2G writer was essentially unmaintained and we will be using the GDAL one going forward.
filters.attribute was split into filters.assign and filters.overlay to separate their functionalities
filters.pmf and filters.outlier have dropped the classify and extract options. They now only classify points and leave it downstream filters to ignore/extract classifications as needed.
filters.outlier has changed the default classification for noise points from 18 to 7 to match the LAS classification code for "Low point (noise)".
pdal pipeline now supports a --stream option which will default to one-at-a-time or chunk-at-a-time point processing when all stages in the pipeline support it. You can use this option to control memory consumption -- for example when interpolating a very large file with writers.gdal
filters.crop was enhanced to support transformed filter polygons, streaming, and radius cropping.
readers.greyhound updated to support greyhound.io 1.0 release, with the most significant enhancement being support for passing downstream JSON filters.
user_data JSON object can be applied to any PDAL pipeline object and it will be carried through processing. You can use this mechanism for carrying your own information in PDAL pipelines without having to sidecar data. #1427
writers.las now can write pdal_metadata and pdal_pipeline VLRs for processing history tracking. #1509#1525
metadata, schema, and spatialreference objects added to global module for filters.programmable and filters.predicate Python filters.
pdalargs option for filters.programmable and filters.predicate allow you to pass in a JSON dictionary to your Python module for override or modification of your script
Stage tags can be used in pipeline override scenarios