Files
GeoData/export_heightmaps.py

78 lines
2.5 KiB
Python

#!/usr/bin/env python3
import glob
import math
import os
from osgeo import gdal
RAW_DIR = "raw_dgm1"
VRT_PATH = "work/dgm.vrt"
OUT_DIR = "export_unity/height_png16"
TILE_SIZE_M = 1000 # real-world tile size in meters
OUT_RES = 1025 # Unity Terrain-friendly resolution (2^n + 1)
RESAMPLE = "bilinear"
os.makedirs("work", exist_ok=True)
os.makedirs(OUT_DIR, exist_ok=True)
# Open VRT
ds = gdal.Open(VRT_PATH)
if ds is None:
raise SystemExit(f"Could not open {VRT_PATH}. Did you run gdalbuildvrt?")
band = ds.GetRasterBand(1)
# Strategy B: compute global min/max for CURRENT downloaded AOI (full scan for stability)
gmin, gmax = band.ComputeRasterMinMax(False)
print(f"GLOBAL_MIN={gmin}, GLOBAL_MAX={gmax}")
# Export manifest for Unity placement later
manifest_path = os.path.join("export_unity", "tile_index.csv")
with open(manifest_path, "w", encoding="utf-8") as f:
f.write("tile_id,xmin,ymin,xmax,ymax,global_min,global_max,out_res\n")
for tif in sorted(glob.glob(os.path.join(RAW_DIR, "*.tif"))):
tds = gdal.Open(tif)
if tds is None:
print(f"Skipping unreadable: {tif}")
continue
gt = tds.GetGeoTransform()
ulx, xres, _, uly, _, yres = gt # yres typically negative in north-up rasters
# Use the source tile footprint directly to avoid shifting during export.
xmax = ulx + xres * tds.RasterXSize
ymin = uly + yres * tds.RasterYSize
xmin = ulx
ymax = uly
base = os.path.splitext(os.path.basename(tif))[0]
tile_id = base # keep stable naming = easy re-export + reimport
tmp_path = os.path.join("work", f"{tile_id}_tmp.tif")
out_path = os.path.join(OUT_DIR, f"{tile_id}.png")
warp_opts = gdal.WarpOptions(
outputBounds=(xmin, ymin, xmax, ymax),
width=OUT_RES,
height=OUT_RES,
resampleAlg=RESAMPLE,
srcNodata=-9999,
dstNodata=gmin, # fill nodata with global min to avoid deep pits
)
gdal.Warp(tmp_path, ds, options=warp_opts)
# Scale to UInt16 (0..65535) using Strategy-B global min/max
trans_opts = gdal.TranslateOptions(
outputType=gdal.GDT_UInt16,
scaleParams=[(gmin, gmax, 0, 65535)],
format="PNG",
)
gdal.Translate(out_path, tmp_path, options=trans_opts)
f.write(f"{tile_id},{xmin},{ymin},{xmax},{ymax},{gmin},{gmax},{OUT_RES}\n")
print(f"Wrote {out_path}")
print(f"Manifest: {manifest_path}")