add sample data and its generator

Author: do-me

.github/.DS_Store

@@ -0,0 +1,72 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5e17e8ee",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np\n",
+    "\n",
+    "N = 1_000_000\n",
+    "\n",
+    "CHUNK = int(N/100)##_000_000\n",
+    "OUT = \"world_points.json\"\n",
+    "\n",
+    "with open(OUT, \"w\") as f:\n",
+    "    f.write(\"[\\n\")\n",
+    "\n",
+    "    written = 0\n",
+    "\n",
+    "    first = True\n",
+    "\n",
+    "    while written < N:\n",
+    "        size = min(CHUNK, N - written)\n",
+    "\n",
+    "        lon = np.random.uniform(-180, 180, size)\n",
+    "        lat = np.random.uniform(-90, 90, size)\n",
+    "        val = np.random.randint(1, 3, size)\n",
+    "\n",
+    "        for i in range(size):\n",
+    "            if not first:\n",
+    "                f.write(\",\\n\")\n",
+    "            first = False\n",
+    "            f.write(f\"[{lon[i]:.6f},{lat[i]:.6f},{val[i]}]\")\n",
+    "\n",
+    "        written += size\n",
+    "\n",
+    "    f.write(\"\\n]\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d33dbdcf",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "py3.14",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.14.0"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

generate_test_data.ipynb

@@ -5,6 +5,8 @@
   <meta charset="utf-8">
   <title>deck.gl Scatterplot Example</title>
   <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon"
+    href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='0.9em' font-size='90'>🗺️</text></svg>">
   <style>
     body {
       margin: 0;