lddl / horizon

Map matching (snapping GPS points to road graph) and routing library in Go

Welcome to my cosy repos page!

Developer in computer vision / telemetry (GPS) fields

• 💼 I’m currently working on a Horizon - map matching library for GPS tracks; and ODaM - Object Detection and Monitoring via GoCV and go-darknet; and Generative Adversarial Networks (GANs) in Golang - https://github.com/LdDl/gan-go
• 🥅 My current goals: improve hobby projects quality and contribute to open source, implement GAN and other interesting neural networks architectures in Golang, learn Rust programming language (oh, here is my toy project for road traffic monitoring in Rust).
• 📖 Interests: applied mathematics, neural networks, graph theory

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horizon's Issues

[FEATURE REQUEST] Maplibre

Hello,
I think that the use of Maplibre would be better than MapboxGL, because it is open-source.

THE http api search POI(Point of Information) from osm data?

THE http api about search POI(Point of Information) from osm data?
will take it into the todo list?

[FEATURE REQUEST / question] ellipsoidal model for distance

Hello,
For mitigating the distortion error in distance, $r$, arisen from spherical model (= S2 geometry), I think that ellipsoidal model would be better, and it would traditionally consist of the following:

• ellipsoidal model + cylindrical projection (e.g., Braun projection) + R-tree (e.g., Priority R-Tree)

Do you have any ideas about it?

• Ellipsoidal model is differentially (i.e., in short range) represented as follows:

$$ \begin{align} dr &= \sqrt{dE^2+dN^2} \\ dE &= \left(\frac{R}{\sqrt{1-e^2\sin^2 \phi }}\right) \cos \phi d \lambda \\ dN &= \left(\frac{R\ (1- e^2)}{\left(1-e^2 \sin^2 \phi\right)^{3/2}}\right) d \phi \\ \end{align} $$

• The Braun projection is represented as follows:

$$ \begin{align} x &= R\lambda \\ y &= 2 R \tan \frac{\phi}{2} \\ \chi &= \tan \frac{\phi}{2} \\ d \phi &= \frac{2}{1 + \chi^2} d \chi \\ \cos \phi &= \frac{1 - \chi^2 }{1 + \chi^2}\\ \sin \phi &= \frac{2 \chi}{1 + \chi^2} \end{align} $$

[FEATURE REQUEST|DOCUMENTATION] Swagger docs

Is your feature request related to a problem? Please describe.
Whould be cool to have swagger documentation for REST-part of applications

Describe the solution you'd like and provide pseudocode examples if you can
Use tool swag for doc generation + do route 'host:port/api/docs/' via Fiber for serving static files
Use rapidoc for visual representation of swagger specification

Describe alternatives you've considered and provide pseudocode examples if you can
nope

Additional context
nope

Installation issue

When trying to install horizon getting following error
Please help me if I am doing something wrong

Thanks

[QUESTION] Edge- or vertex-based model?

Hello,
Which does horizon use, edge-based or vertex-based algorithm/model?

I think that the edge-based one can be represented by the trellis transition diagram whose nodes correspond to road-network links (=edges), which can handle multiple edges in a multigraph of road network, whereas the vertex-based one's nodes correspond to road-network nodes.

[FEATURE REQUEST] Isochrones REST API

Is your feature request related to a problem? Please describe.
We need REST server-side for isochrones building

Describe the solution you'd like and provide pseudocode examples if you can
CH-library gives us opportunity to calculate isochrones.
So just wrap this into service which would

1. accepts WGS84 Point and cost restriction.
2. calculates nearest possible vertex
3. calcuates isochrones via CH-library
4. prepares output as polygons or polylines (it depends on what we want: edges geom with 'colorized' attributes, or polygons built on top of edges' vertices with same 'colorization'), or plain points with costs info

Describe alternatives you've considered and provide pseudocode examples if you can
nope

Additional context
Would be awesome to have client-side example also
Wiki: https://en.wikipedia.org/wiki/Isochrone_map

[FEATURE REQUEST / question] vehicle trajectory analysis

Hello,
I think that the horizon's map-matching technology would be closely related to vehicle trajectory analysis. See, fo example:

• Traffic-state-reconstruction-using-Deep-CNN (github.com)

Do you have any idea about that?

[BUG] Dependabot alerts

Need to deal with fasthttp update

Screenshots

Question: is there a way to find the fastest route between coordinates in the supplied order.

Is there a way to find the fastest route between coordinates in the supplied order:
Example:
Need to find out a shortest path from 'A' to 'B', 'C','X','Y'
The result would be like as per road network.