pcodec
gdal
pcodec | gdal | |
---|---|---|
19 | 44 | |
248 | 4,509 | |
- | 2.0% | |
8.8 | 10.0 | |
2 days ago | 3 days ago | |
Rust | C++ | |
Apache License 2.0 | GNU General Public License v3.0 or later |
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pcodec
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Learnings from making things fast
Context: I've been iterating on my side project pcodec (a codec for columns of numerical data) and have gradually improved decompression speed from ~150MB/s to ~1GB/s. Not everything here is novel or Rust-specific, but here's what I've learned in the process:
- Compressing bytes?
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Worries about tANS?
For context: I'm creating an experimental successor to my library Quantile Compression, which does good compression for numerical sequences and has several users. I have a variable number of symbols which may be as high as 212 in some cases, but is ~26 in most cases. The data is typically 216 to 224 tokens long.
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Quantile Compression, a compression format for numerical data that improves compression ratio by ~30% over alternatives
I'm not a member, but you can use the CLI to try it out pretty easily: https://github.com/mwlon/quantile-compression/tree/main/q_compress_cli . Let me know how it does
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I built Quantile Compression, which could make all our numerical columnar data 25% smaller.
You can try it out very easily with the CLI which works on CSV and Parquet columns now, e.g. cargo run --release compress --csv my.csv --col-name my_column out.qco
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Quantile Compression: 35% higher compression ratio for numeric sequences than any other compressor
Right, please don't try to use it for general files. It looks like zpaq is kinda hard to set up except on windows, so I'm probably not going to, but I encourage you to try it out! There's an example you can use to generate a bunch of random numerical distributions, outputting binary files, .qco, and other formats.
- Q_compress: Lossless compressor and decompressor for numerical data
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q_compress 0.7: still has 35% higher compression ratio than .zstd.parquet for numerical sequences, now with delta encoding and 2x faster than before
Here's how you can generate benchmark data, including binary files: https://github.com/mwlon/quantile-compression/blob/main/q_compress/examples/primary.md
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Quantile Compression, a format and algorithm for numerical sequences offering 35% higher compression ratio than .zstd.parquet.
I made a simple CLI for compressing and inspecting .qco files. Not available on package managers yet, but it's still pretty easy to try out: https://github.com/mwlon/quantile-compression/blob/main/CLI.md
- Quantile Compression (q-compress), a new compression format and rust library that shrinks real-world columns of numerical data 10-40% smaller than other methods
gdal
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Building a Dynamic Tile Server Using Cloud Optimized GeoTIFF(COG) with TiTiler
TiTiler is a dynamic tile server built on FastAPI and Rasterio/GDAL. Its main features include support for Cloud Optimized GeoTIFF(COG), multiple projection methods, various output formats (JPEG, JP2, PNG, WEBP, GTIFF, NumpyTile), WMTS, and virtual mosaic. It also provides Lambda and ECS deployment environments using AWS CDK.
- Protomaps – A free and open source map of the world
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Company decided to move away from AutoCAD to something cheaper...
GDAL is the real heart, the python aspect is mostly wrappers around that I'm fairly sure. I love python for the record, the only reason I bring it up, is cause python haters accuse it of being slow, but QGIS drops down to C++ when speed is necessary, like most modern packages do.
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gdal 0.15 is out!
gdal 0.15 (repo, docs), a set of Rust bindings for the GDAL library, used for access to geo-spatial data formats, is now out!
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What's missing from C# in Godot 4?
GDAL (Geospatial Data Abstraction Library) is a the geospatial data processing library. It handles a lot of Raster/Vector analysis and alteration. gdal_contour and gdal_rasterize which would be used to create isolines (contour lines) . There's more complex processing and analyses than that. More common is reprojecting multiple layers, and some that being as Vector files, into different coordiatne systems.
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12 Open Source GIS Software
Access: GDAL
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Not sure if I'm ready to make the jump from Unity yet.
As an example we use GDAL heavily through its C# binds. We do all the additional data processing, that isn't done by the C++ GDAL, in C#. The final results are both Data (held in memory or temp exported to a file), and a normalized Raster Texture that we can display on a TextureRect. Most of the C# data processing scripts aren't even Inheriting from any Godot Class.
- gdal v3.6.3 released
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What data structure should I use for reading data from a .shp file?
I think this would be the best way to handle this. GDAL is what you should look into for this project.
- GDAL v3.6.2 released
What are some alternatives?
ans-large-alphabet - Large-Alphabet Semi-Static Entropy Coding Via Asymmetric Numeral Systems
geos - Geometry Engine, Open Source
encoding - Integer Compression Libraries for Go
tippecanoe - Build vector tilesets from large collections of GeoJSON features.
x3-rust - X3 Lossless Audio Compression for Rust
ryg_rans - Simple rANS encoder/decoder (arithmetic coding-ish entropy coder).
tilemaker - Make OpenStreetMap vector tiles without the stack
spark-pancake-connector - support for the "pancake" format in Spark
Apache Camel - Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.
bitwise-compression - Trying some compression methods
openmaptiles - OpenMapTiles Vector Tile Schema Implementation