Compass Data

A Rust library for reading, writing, and working with Compass cave survey project files (.mak) and survey data files (.dat).

Overview

This library enables interoperation and data sharing between cave survey software by providing a complete implementation of the Compass file formats. It supports:

• Project files (.mak): Parse and create project files that organize multiple survey data files
• Survey data files (.dat): Parse and serialize individual survey data with shots, stations, and metadata
• Coordinate systems: UTM coordinates with support for 23 geodetic datums
• Rich error reporting: Detailed error messages with source locations using miette

Usage

Reading a Project File

use compass_data::Project;
use std::path::PathBuf;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Read a project file (parses metadata but doesn't load survey data yet)
    let project = Project::read(&PathBuf::from("cave.mak"))?;

    println!("Project has {} survey files", project.survey_files.len());

    // Access file metadata without loading survey data
    for dat_file in &project.survey_files {
        println!("  File: {}", dat_file.file_path.display());
        println!("  Datum: {:?}", dat_file.file_state.datum);
    }

    // Load all survey data from disk
    let loaded_project = project.load_survey_files()?;

    // Now access the actual survey data
    for dat_file in &loaded_project.survey_files {
        for survey in dat_file.surveys() {
            println!("Survey: {} - {} shots", survey.name, survey.shots.len());
        }
    }
    Ok(())
}

Reading a Survey Data File Directly

use compass_data::Survey;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let contents = std::fs::read_to_string("survey.dat")?;
    let surveys = Survey::parse_dat_file(&contents)?;

    for survey in &surveys {
        println!("Cave: {}", survey.cave_name);
        println!("Survey: {}", survey.name);
        println!("Date: {}", survey.date);
        println!("Shots: {}", survey.shots.len());
    }
    Ok(())
}

Serializing Survey Data

use compass_data::Survey;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Parse and re-serialize (round-trip)
    let contents = std::fs::read_to_string("survey.dat")?;
    let surveys = Survey::parse_dat_file(&contents)?;

    for survey in &surveys {
        let serialized = survey.serialize();
        std::fs::write(format!("{}.dat", survey.name), serialized)?;
    }
    Ok(())
}

Key Types

Features

• serde: Enable serialization/deserialization with serde
• cli: Build the compass CLI tool for inspecting project and survey files

CLI Tool

When built with the cli feature, a command-line tool is available:

# Install
cargo install compass_data --features cli

# Inspect a project file
compass inspect project cave.mak

# Inspect with full survey data
compass inspect project cave.mak --load

# Inspect a survey data file
compass inspect survey cave.dat

# Show detailed shot data
compass inspect survey cave.dat --verbose

File Format Documentation

The Compass file formats are documented at:

• Project File Format
• Survey Data File Format

License

Licensed under either:

• Apache License Version 2.0, or
• MIT license

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.