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new file mode 100644
index 0000000..c47c02d
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+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ac403e0
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "mercator_data_generator"
+version = "0.1.0"
+authors = ["EPFL-DIAS", "Lionel Sambuc <lionel.sambuc@epfl.ch>"]
+
+edition = "2018"
+
+description = "Generate test data for Mercator"
+#homepage = "https://crates.io/crates/mercator_data_generator"
+repository = "https://github.com/epfl-dias/mercator_data_generator"
+readme = "README.md"
+
+keywords = []
+categories = [ ]
+
+license = "MIT"
+#license-file = "LICENSE"
+
+include = ["Cargo.toml", "README.md", "LICENSE", "ACKNOWLEDGEMENTS", "src/**/*.rs"]
+
+[dependencies]
+serde = "^1.0"
+serde_derive = "^1.0"
+serde_json = "^1.0"
+rand = "^0.7"
+
+[workspace]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..29c7a5d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,38 @@
+# Mercator Test data generator
+
+Small tool to generate test data for Mercator, a spatial index.
+
+## Mercator: Spatial Index
+
+**Mercator** is a spatial *volumetric* index for the [Human Brain Project](http://www.humanbrainproject.eu). It is a component of the [Knowledge Graph](http://www.humanbrainproject.eu/en/explore-the-brain/search/) service, which  provides the spatial anchoring for the metadata registered as well as processes the volumetric queries.
+
+It is build on top of the Iron Sea database toolkit.
+
+## Iron Sea: Database Toolkit
+
+**Iron Sea** provides a set of database engine bricks, which can be combined and applied on arbitrary data structures.
+
+Unlike a traditional database, it does not assume a specific physical structure for the tables nor the records, but relies on the developper to provide a set of extractor functions which are used by the specific indices provided.
+
+This enables the index implementations to be agnostic from the underlying data structure, and re-used.
+
+## Requirements
+
+### Software
+
+ * Rust: https://www.rust-lang.org
+
+## Quick start
+
+Adapt the main function to generate the datasets you want, then run:
+
+```sh
+cargo run --release
+```
+
+## Acknowledgements
+
+This open source software code was developed in part or in whole in the
+Human Brain Project, funded from the European Union’s Horizon 2020
+Framework Programme for Research and Innovation under the Specific Grant
+Agreement No. 785907 (Human Brain Project SGA2).
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..883094a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,49 @@
+#[macro_use]
+extern crate serde_derive;
+
+mod storage;
+
+use rand::distributions::{Distribution, Uniform};
+
+use rand::prelude::ThreadRng;
+use storage::*;
+
+const POSITIONS_PER_SHAPE: usize = 1000;
+
+fn get_point(space_name: &str, rng: &mut ThreadRng, die: &Uniform<f64>) -> SpatialObject {
+    let mut shapes = Vec::with_capacity(POSITIONS_PER_SHAPE);
+
+    for _ in 0..POSITIONS_PER_SHAPE {
+        shapes.push(Shape {
+            type_name: "Point".to_string(),
+            vertices: vec![vec![die.sample(rng), die.sample(rng), die.sample(rng)]],
+            reference_space: space_name.to_string(),
+        });
+    }
+
+    SpatialObject::new(shapes, format!("oid{}", die.sample(rng)))
+}
+
+fn get_space(nb_points: usize, rng: &mut ThreadRng, die: &Uniform<f64>) {
+    let space_name = "std";
+
+    let mut objects = Vec::with_capacity(nb_points);
+
+    for _ in 0..nb_points {
+        objects.push(get_point(&space_name, rng, &die));
+    }
+
+    storage::store(format!("{}k", nb_points).as_str(), objects);
+}
+
+fn main() {
+    let mut rng = rand::thread_rng();
+    let die = Uniform::from(0.0..1.0);
+
+    get_space(1, &mut rng, &die);
+    get_space(10, &mut rng, &die);
+    get_space(100, &mut rng, &die);
+    get_space(1000, &mut rng, &die);
+    get_space(10000, &mut rng, &die);
+    //get_space(40000, &mut rng, &die);
+}
diff --git a/src/storage.rs b/src/storage.rs
new file mode 100644
index 0000000..a661782
--- /dev/null
+++ b/src/storage.rs
@@ -0,0 +1,102 @@
+use std::fs::File;
+use std::io::BufWriter;
+
+use serde::Serialize;
+
+#[derive(Clone, Debug, Serialize)]
+pub struct Space {
+    pub name: String,
+    pub system: CoordinateSystem,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct CoordinateSystem {
+    pub origin: Vec<f64>,
+    pub axes: Vec<Axis>,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct Axis {
+    pub measurement_unit: String,
+    pub graduation: Graduation,
+    pub unit_vector: Vec<f64>,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct Graduation {
+    pub set: String,
+    pub minimum: f64,
+    pub maximum: f64,
+    pub steps: u64,
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct SpatialObject {
+    pub properties: Properties,
+    pub shapes: Vec<Shape>,
+}
+
+impl SpatialObject {
+    pub fn new(shapes: Vec<Shape>, id: String) -> Self {
+        SpatialObject {
+            shapes,
+            properties: Properties {
+                type_name: "Feature".to_string(),
+                id,
+            },
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize)]
+pub struct Shape {
+    #[serde(rename = "type")]
+    pub type_name: String,
+    #[serde(rename = "space")]
+    pub reference_space: String,
+    pub vertices: Vec<Point>,
+}
+
+type Point = Vec<f64>;
+
+#[derive(Clone, Debug, Serialize)]
+pub struct Properties {
+    #[serde(rename = "type")]
+    pub type_name: String,
+    pub id: String,
+}
+
+mod json {
+    use super::*;
+
+    pub fn store<T>(data: T, to: &str)
+    where
+        T: Serialize,
+    {
+        let file_out =
+            File::create(to).unwrap_or_else(|e| panic!("Unable to create file: {}: {}", to, e));
+
+        // We create a buffered writer from the file we get
+        let writer = BufWriter::new(&file_out);
+
+        serde_json::to_writer(writer, &data).unwrap();
+    }
+}
+
+pub fn store<S, T>(name: S, data: T)
+where
+    S: Into<String>,
+    T: Serialize,
+{
+    let name = name.into();
+    /*
+        // Convert Reference Space definitions
+        let fn_out = format!("{}.spaces.json", name);
+
+        json::store::<Vec<json::Space>>(data, &fn_out);
+    */
+    // Convert Spatial Objects
+    let fn_out = format!("{}.objects.json", name);
+
+    json::store(data, &fn_out);
+}