roaring
S2 geometry
| roaring | S2 geometry | |
|---|---|---|
| 5 | 4 | |
| 2,349 | 1,638 | |
| 0.9% | 0.7% | |
| 7.6 | 2.0 | |
| 14 days ago | 10 months ago | |
| Go | Go | |
| Apache License 2.0 | Apache License 2.0 |
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roaring
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I have some questions about defining a series of bits in Golang
For (3), and if you’re interested in checking if specific bits are set or not, take a look at https://github.com/bits-and-blooms/bitset and https://github.com/RoaringBitmap/roaring.
- Bitmasks - how and why to use?
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Skipfilter
Each topic has a roaring bitmap. Each bit corresponds to a subscriber in the skip list. For each topic, head and tail cursors are also maintained to ensure that newly added subscriptions are always tested and deleted subscriptions are always evicted. Roaring bitmaps are compressed and discontinuous so memory usage again remains bounded as subscribers come and go.
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Bit shifting blew my mind
Definitely take a look at a roaring bitmap. https://github.com/RoaringBitmap/roaring
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Protocol buffers database, a Key-Value database on the wire
Roaring bitmaps + btrees are a rock solid indexing approach. Alternatively, bleve has a lot out of the box but that's introducing a new datastore, basically.
S2 geometry
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I wrote a package to compute the distance between two geographic latitude, longitude coordinates
I could be mistaken, but https://github.com/golang/geo does it already...
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Get Coordinates Within Maps Bound Box
s2 a geo library from google can do exactly that, and has an implementation in Go. https://github.com/golang/geo
- Looking for a library to perform boolean operations on polygons
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Protocol buffers database, a Key-Value database on the wire
There's a Java port and bindings for Python. The go port has been a work in progress for a while and the claimed to be at about 40% done. There's a rust port but it is based off of the go port and thus not complete either.
What are some alternatives?
skiplist - skiplist for golang
h3 - Hexagonal hierarchical geospatial indexing system
boomfilters - Probabilistic data structures for processing continuous, unbounded streams.
S2 geojson - Draw a polygon on the map or paste a geoJSON and explore how the s2.RegionCoverer covers it with S2 cells depending on the min and max levels
bit - Bitset data structure
h3-go - Go bindings for H3, a hierarchical hexagonal geospatial indexing system
bitset - Go package implementing bitsets
osm - General purpose library for reading, writing and working with OpenStreetMap data
hyperloglog - HyperLogLog with lots of sugar (Sparse, LogLog-Beta bias correction and TailCut space reduction) brought to you by Axiom
mbtileserver - Basic Go server for mbtiles
golang-set - A simple, battle-tested and generic set type for the Go language. Trusted by Docker, 1Password, Ethereum and Hashicorp.
simplefeatures - Simple Features is a pure Go Implementation of the OpenGIS Simple Feature Access Specification