Update tile images for version 4.0: replaced multiple PNG files across various directories with new assets to enhance visual quality and consistency.

misc/update-openstreetmap-tiles.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# If we're in "misc", cd ..
+if [[ "$(basename "$PWD")" == "misc" ]]; then
+    cd ..
+fi
+
+# ========== CONFIGURATION ==========
+USER_AGENT="BunkerWebTileDownloader/1.0 (contact@bunkerity.com)"
+BASE_URL="https://tile.openstreetmap.org"
+MIN_ZOOM=2
+MAX_ZOOM=4
+OUT_DIR="./src/ui/app/static/img/tiles"
+MAX_RETRIES=5
+SLEEP_BETWEEN_REQUESTS=0.6   # OSM: no more than 2–3 requests per second
+
+rm -rf "$OUT_DIR"
+
+download_tile() {
+    local z="$1"
+    local x="$2"
+    local y="$3"
+    local tile_dir="$OUT_DIR/$z/$x"
+    local tile_file="$tile_dir/$y.png"
+    local url="$BASE_URL/$z/$x/$y.png"
+
+    # Already downloaded
+    [[ -f "$tile_file" ]] && return
+
+    mkdir -p "$tile_dir"
+
+    local attempt=1
+    local delay="$SLEEP_BETWEEN_REQUESTS"
+    while (( attempt <= MAX_RETRIES )); do
+        wget --user-agent="$USER_AGENT" -q -O "$tile_file" "$url" && break
+        echo "Failed: $url (attempt $attempt)"
+        rm -f "$tile_file"
+        sleep "$delay"
+        delay=$(awk "BEGIN {print $delay * 2}") # exponential backoff
+        ((attempt++))
+    done
+
+    if (( attempt > MAX_RETRIES )); then
+        echo "Giving up: $url"
+    else
+        echo "Downloaded: $z/$x/$y.png"
+    fi
+}
+
+for z in $(seq "$MIN_ZOOM" "$MAX_ZOOM"); do
+    max_index=$(( (1 << z) - 1 ))
+    for x in $(seq 0 "$max_index"); do
+        for y in $(seq 0 "$max_index"); do
+            download_tile "$z" "$x" "$y"
+            sleep "$SLEEP_BETWEEN_REQUESTS"
+        done
+    done
+done
+
+echo "All tiles downloaded under $OUT_DIR."
+
+# Notes:
+# - Set USER_AGENT to your real email/website for OSM compliance.
+# - This script never runs more than 1 request at a time.
+# - The 0.6s delay is <2 req/sec (safe).
+# - If you want to throttle more (e.g. overnight download), increase SLEEP_BETWEEN_REQUESTS.
+# - Respect OSM: never mass-download huge areas.