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README
Rust Reverse Geocoder
A fast reverse geocoder in Rust. Inspired by Python reverse-geocoder.
Links
- Crate
- 2.0.0 Docs
- 1.0.1 Docs
- Build status:
Description
rrgeo takes a latitude and longitude as input and returns the closest city, country, latitude, and longitude, using a k-d tree to efficiently find the nearest neighbour based on a known list of locations. This can be useful if you need to reverse geocode a large number of coordinates quickly, or just need the rough location of coordinates but don't want the expense or complication of an online reverse geocoder.
This crate is implemented as a library, an Actix REST API, a Warp REST API, and as a command-line utility, thanks to Cargo workspaces.
Usage
Command line search
Example usage:
> cargo run -p rrgeo-cmd --release 40 -73
71 ms to load cities.csv
3 ms to build the KdTree
(40.72788, -73.09761): West Sayville New York Suffolk County US
Actix Web Server
Example usage:
cargo run -p rrgeo-actix --release
Navigate to the local web server.
Warp Web Server
Example usage:
cargo run -p rrgeo-warp --release
Navigate to the local web server.
Benchmarks
Benchmarked on Intel Core i7 4790K at 4.00GHz.
The core library (measured with criterion):
> cargo bench
Benchmarking search: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 11.7s or reduce sample count to 40.
search time: [2.3144 ms 2.3440 ms 2.3760 ms]
change: [-3.7824% -1.2338% +1.6347%] (p = 0.36 > 0.05)
No change in performance detected.
Found 6 outliers among 100 measurements (6.00%)
2 (2.00%) high mild
4 (4.00%) high severe
Served via Actix Web:
> cargo run --release --bin rrgeo-actix
> oha http://localhost:3000/\?lat\=40\&long\=\-73 -z 5sec
Summary:
Success rate: 1.0000
Total: 5.0166 secs
Slowest: 0.0531 secs
Fastest: 0.0023 secs
Average: 0.0166 secs
Requests/sec: 2985.8853
Total data: 1.47 MiB
Size/request: 103.00 B
Size/sec: 300.34 KiB
Response time histogram:
0.004 [606] |■■■■
0.009 [2031] |■■■■■■■■■■■■■■■
0.013 [4248] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.017 [3815] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.022 [2415] |■■■■■■■■■■■■■■■■■■
0.026 [1097] |■■■■■■■■
0.030 [542] |■■■■
0.035 [130] |
0.039 [55] |
0.043 [34] |
0.048 [6] |
Latency distribution:
10% in 0.0092 secs
25% in 0.0124 secs
50% in 0.0158 secs
75% in 0.0206 secs
90% in 0.0252 secs
95% in 0.0284 secs
99% in 0.0347 secs
Details (average, fastest, slowest):
DNS+dialup: 0.0043 secs, 0.0008 secs, 0.0099 secs
DNS-lookup: 0.0000 secs, 0.0000 secs, 0.0001 secs
Status code distribution:
[200] 14979 responses
Served via Warp:
> cargo run --release --bin rrgeo-warp
Summary:
Summary:
Success rate: 1.0000
Total: 5.0006 secs
Slowest: 0.2553 secs
Fastest: 0.0113 secs
Average: 0.1263 secs
Requests/sec: 388.9503
Total data: 275.42 KiB
Size/request: 145.00 B
Size/sec: 55.08 KiB
Response time histogram:
0.022 [9] |
0.044 [10] |
0.067 [8] |
0.089 [9] |
0.111 [78] |■
0.133 [1793] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.155 [0] |
0.177 [0] |
0.200 [0] |
0.222 [0] |
0.244 [38] |
Latency distribution:
10% in 0.1229 secs
25% in 0.1239 secs
50% in 0.1250 secs
75% in 0.1266 secs
90% in 0.1277 secs
95% in 0.1285 secs
99% in 0.2504 secs
Details (average, fastest, slowest):
DNS+dialup: 0.0045 secs, 0.0009 secs, 0.0097 secs
DNS-lookup: 0.0000 secs, 0.0000 secs, 0.0001 secs
Status code distribution:
[200] 1945 responses
Performance
Below we have comparisons between the Rust, Python and Node.js versions.
| Rust | Node | |
|---|---|---|
| Load CSV | 61ms | 1221ms |
| Build KdTree | 4ms | 805ms |
| Search | 1.1ms | 0.5ms |
Most of the performance differences appear to be in time taken to load the CSV file and create the k-d tree, but not searching the tree. Searching time resembles algorithmic complexity of k-d tree. Python version is partly implemented in C++ meaning it is not a purely Python implementation. (It might be interesting to see how a pure Python version performs.) The Node.js version is pure JavaScript, as in, not using C add-ons.
Rust --release build
Running `target/release/web`
PT0.062677465S seconds to load cities.csv
PT0.003835230S seconds to build the KdTree
PT0.068904911S seconds to search
PT0.002596743S seconds to search
PT0.002887542S seconds to search
Rust --debug build
Running `target/debug/web`
PT1.198010357S seconds to load cities.csv
PT0.124435778S seconds to build the KdTree
PT1.401588031S seconds to search
PT0.077837996S seconds to search
PT0.078178297S seconds to search
Python mode 1 (single threaded K-D tree)
➜ reverse-geocoder git:(master) ✗ time python mode1.py
Loading formatted geocoded file...
[{'name': 'Saint Louis Park', 'cc': 'US', 'lon': '-93.34801', 'admin1': 'Minnesota', 'admin2': 'Hennepin County', 'lat': '44.9483'}]
python mode1.py 1.60s user 0.22s system 98% cpu 1.847 total
Python mode 2 (multi threaded K-D tree)
➜ reverse-geocoder git:(master) ✗ time python mode2.py
Loading formatted geocoded file...
[{'name': 'Saint Louis Park', 'cc': 'US', 'lon': '-93.34801', 'admin1': 'Minnesota', 'admin2': 'Hennepin County', 'lat': '44.9483'}]
python mode2.py 2.82s user 0.34s system 142% cpu 2.221 total
nreverse (Node.js version)
load modules: 12.619ms
load cities.csv: 1221.833ms
create kdtree: 805.310ms
search tree: 0.758ms
search tree: 0.086ms
search tree: 0.198ms
search tree: 0.104ms
search tree: 0.031ms
total_heap_size 114mb
total_heap_size_executable 5mb
total_physical_size 112mb
total_available_size 1325mb
used_heap_size 83mb
heap_size_limit 1432mb
malloced_memory 0mb
peak_malloced_memory 4mb
does_zap_garbage 0mb
License
Licensed under either of
- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
*Note that all licence references and agreements mentioned in the rust-reverse-geocoder README section above
are relevant to that project's source code only.