ogc-grpc
h3
| ogc-grpc | h3 | |
|---|---|---|
| 1 | 21 | |
| 0 | 4,619 | |
| - | 1.3% | |
| 0.0 | 7.2 | |
| about 3 years ago | 6 days ago | |
| C | ||
| The Unlicense | Apache License 2.0 |
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ogc-grpc
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Protocol buffers database, a Key-Value database on the wire
I have later started mapping the OGC WFS api at MikkelHJuul/ogc-grpc, I want to open source the WFS gRPC mappings including open api specification for the proxy server. And use this as a backing database. Having two very well-defined API boundaries for the gRPC service between the two makes for focused developer experience. I may throw in my extension library for fun. Write some demo app for it all.
h3
- H3: Hexagonal hierarchical geospatial indexing system
- Evaluation of Location Encoding Systems
- Not sure if this is the worst or most genius indentation I've seen
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A population density map of the state of Pennsylvania
It looks like the base Kontur dataset uses H3 resolution 8, and there’s a lookup table here. “400m” seems to refer to the edge length (which averages to 461m).
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[ANN] HexTree: geographical region-to-value mapping
I can speak to quadtrees, but the primary reason for using this is that you need a geographic "dictionary" (not using the word map to avoid confusion with charts), and you're perhaps already using the H3 hexagonal grid system.
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What's everyone working on this week (34/2022)?
HexSet: is a way of storing a set of H3 cells in a tree, and doing fast (2-20 ns on my 2013 trashcan Mac Pro) membership tests. You must first convert the input data (e.g. GeoJSoN polygon) into H3 cells.
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Surprising result while transpiling C to Go
> What an amazing tool that can completely change function names when it converts from C to Go.
How can one read the code of the benchmark, then switch into virulent sarcasm mode without trying to understand the code? And seeing "+1" comments without any effort to understand is also disheartening.
The blog post had a link about the Go helper functions the author used. It lands on https://github.com/akhenakh/goh3/blob/main/h3.go This shows that the `FromGeo()` function used by the Go benchmark is a helper that calls transpiled functions. The benchmark code itself was of course not transpiled, so the sarcasm was unneeded and wrong.
If anyone wants to dig in deeper, the C function `latLngToCell()` calls 2 functions, see https://github.com/uber/h3/blob/master/src/h3lib/lib/h3Index...
- Completely ignorant Newbie needing help with launching Ubers H3 Software.
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Anyone doing geospatial queries? NoSQL? Amazon Location Service?
Uber just released their library to perform geospatial indexing - https://h3geo.org/. This might be an useful building block for you.
What are some alternatives?
protoc-gen-star - protoc plugin library for efficient proto-based code generation
S2 geometry - S2 geometry library in Go
Leaflet - 🍃 JavaScript library for mobile-friendly interactive maps 🇺🇦
s2geometry - Computational geometry and spatial indexing on the sphere
mapbox-gl-js - Interactive, thoroughly customizable maps in the browser, powered by vector tiles and WebGL
sled - the champagne of beta embedded databases
starlink-coverage - Calculating some statistics about Starlink satellites
maplibre-gl-js - MapLibre GL JS - Interactive vector tile maps in WebGL2
Cesium - An open-source JavaScript library for world-class 3D globes and maps :earth_americas:
ultra-weather - UltraWeather gives user-friendly, actionable weather forecasts.