auto-sync: 2026-05-13 11:00:01

tasks/enduro-trails/scripts/gen_tri_v2.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+set -e
+
+echo '=== REGENERATE TRI TILES WITH LOWER THRESHOLDS ==='
+echo "Start: $(date)"
+
+TMP='/tmp/tri_gen'
+TERRAIN_DIR='/home/slin/enduro-trails/data/terrain'
+TRI_DIR="${TERRAIN_DIR}/tri"
+
+echo ''
+echo '=== Step 1: New color ramp (lower thresholds) ==='
+# TRI stats: mean=2.97, stddev=2.12, max=86.8
+# Most terrain: 0-5. Interesting: 3+. Very rugged: 8+
+cat > $TMP/tri_color_v2.txt << 'EOF'
+nv    0    0    0    0
+0     0    0    0    0
+2     0    0    0    0
+3     255  255  100  60
+4     255  230  50   100
+5     255  200  0    140
+7     255  150  0    180
+10    255  100  0    200
+15    230  50   0    220
+20    200  0    0    235
+30    180  0   50    245
+50    150  0   100   255
+EOF
+
+echo ''
+echo '=== Step 2: Generate colored TRI ==='
+gdaldem color-relief \
+  $TMP/tri_raw.tif \
+  $TMP/tri_color_v2.txt \
+  $TMP/tri_colored_v2.tif \
+  -alpha \
+  -of GTiff \
+  -co COMPRESS=LZW \
+  -co BIGTIFF=YES 2>&1
+
+echo 'Stats:'
+gdalinfo -stats $TMP/tri_colored_v2.tif 2>&1 | grep STATISTICS_MAX
+
+echo ''
+echo '=== Step 3: Regenerate tiles ==='
+rm -rf ${TRI_DIR}
+mkdir -p ${TRI_DIR}
+
+gdal2tiles.py \
+  --zoom=5-12 \
+  --processes=4 \
+  --tilesize=256 \
+  --webviewer=none \
+  $TMP/tri_colored_v2.tif \
+  ${TRI_DIR}/ 2>&1
+
+echo ''
+echo '=== Step 4: Stats ==='
+for z in 5 6 7 8 9 10 11 12; do
+  total=$(find ${TRI_DIR}/$z/ -name '*.png' 2>/dev/null | wc -l)
+  nonempty=$(find ${TRI_DIR}/$z/ -name '*.png' -size +400c 2>/dev/null | wc -l)
+  echo "  zoom $z: $total total, $nonempty non-empty"
+done
+
+echo ''
+du -sh ${TRI_DIR}
+echo '=== DONE ==='
+echo "End: $(date)"