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Freemap Tiler

Tool to create MBTiles from raster geodata with a full pyramid overview from to 0. Uses Z-order curve to efficiently create lower-zoom tiles storing minimal tiles in RAM.

Source can be any raster GDAL source containing 4 bands - Red, Green, Blue, Alpha. The tool takes care of reprojection, slicing to tiles including all lowzoom (overview) tiles and storing it to MBTile format with cusom extension.

Extensions of MBTile format

Prodiced MBTile has following extensions:

  • column tile_alpha in tiles table contains ZSTD compressed alpha channel (layer mask)
  • limits metadata contains JSON encoded column/row bounds for every zoom level: { [zoom_level: string]: min_x: number, max_x: number, min_y: number, max_y: number }

These extensions are supported by freemap-tileserver which should be used for serving the tiles.

Building and installing

If necessary, first clone, compile and install latest GDAL locally and then use it with GDAL_HOME=/usr/local environment variable.

GDAL_HOME=/usr/local cargo install --path .

Command options

Use -h or --help to get description of all available options:

Usage: freemap-tiler [OPTIONS] --source-file <SOURCE_FILE> --target-file <TARGET_FILE> --max-zoom <MAX_ZOOM>

Options:
      --source-file <SOURCE_FILE>
          Input raster geofile
      --target-file <TARGET_FILE>
          Output *.mbtiles file
      --max-zoom <MAX_ZOOM>
          Max zoom level
      --source-srs <SOURCE_SRS>
          Source SRS
      --transform-pipeline <TRANSFORM_PIPELINE>
          Projection transformation pipeline
      --tile-size <TILE_SIZE>
          Tile size [default: 256]
      --num-threads <NUM_THREADS>
          Number of threads for parallel processing [default: available parallelism]
      --jpeg-quality <JPEG_QUALITY>
          JPEG quality [default: 85]
  -h, --help
          Print help
  -V, --version
          Print version

Example

freemap-tiler \
  --source-file vychod-with-mask.vrt \
  --target-file vychod.mbtiles \
  --max-zoom 19 \
  --source-srs EPSG:8353 \
  --jpeg-quality 90 \
  --transform-pipeline "+proj=pipeline +step +inv +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +inv +proj=hgridshift +grids=Slovakia_JTSK03_to_JTSK.gsb +step +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +inv +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +proj=push +v_3 +step +proj=cart +ellps=bessel +step +proj=helmert +x=485.021 +y=169.465 +z=483.839 +rx=-7.786342 +ry=-4.397554 +rz=-4.102655 +s=0 +convention=coordinate_frame +step +inv +proj=cart +ellps=WGS84 +step +proj=pop +v_3 +step +proj=webmerc +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84"

Cookbook

Slovakia

  1. download part of Ortofotomozaika SR you want to process from and extract it, for example východ (vychod)
  2. build VRT: 
    gdalbuildvrt -a_srs EPSG:8353 vychod.vrt vychod-extracted/*.tif
  3. create a tile index file gdaltindex tmp.gpkg vychod-extracted/*.tif && ogr2ogr -f GPKG -t_srs EPSG:8353 index.gpkg tmp.gpkg && rm tmp.gpkg
  4. download lms_datum_snimkovania_#.zip where # is currently 2 or 3
  5. dissolve lms_datum_snimkovania: 
    ogr2ogr \
  -f GPKG \
  sk-area.gpkg \
  /vsizip/lms_datum_snimkovania_2.zip/lms_datum_snimkovania_2_cyklus.shp \
  -nln dissolved \
  -nlt POLYGON \
  -dialect sqlite \
  -sql "SELECT ST_Simplify(ST_MakePolygon(ST_ExteriorRing(ST_Buffer(ST_Union(geometry), 0.00001, 1))), 0.1) AS geometry FROM lms_datum_snimkovania_2_cyklus" \
  -a_srs EPSG:8353
  6. dissolve the tile index 
    ogr2ogr \
  -f GPKG \
  vychod-tiles.gpkg \
  index.gpkg \
  -nln tiles \
  -nlt POLYGON\
  -dialect sqlite \
  -sql "SELECT ST_Union(geom) AS geometry FROM 'index'" \
  -a_srs EPSG:8353
  7. create a vector mask 
    ogr2ogr -f GPKG combined.gpkg sk-area.gpkg -nln dissolved
cp combined.gpkg vychod-mask.gpkg
ogr2ogr -f GPKG -update -append vychod-mask.gpkg vychod-tiles.gpkg -nln tiles
ogr2ogr -f GPKG intersection.gpkg vychod-mask.gpkg \
  -dialect sqlite \
  -sql "
    SELECT ST_Intersection(a.geometry, b.geometry) AS geometry
    FROM tiles a, dissolved b
    WHERE ST_Intersects(a.geometry, b.geometry)
  " \
  -nln intersection \
  -nlt POLYGON \
  -a_srs EPSG:8353
  8. rasterize the mask 
    gdal_rasterize \
  -burn 0 \
  -at -i \
  -init 255 \
  -tap \
  $(gdalinfo -json vychod.vrt | jq -r '"-te \(.cornerCoordinates.upperLeft[0]) \(.cornerCoordinates.lowerRight[1]) \(.cornerCoordinates.lowerRight[0]) \(.cornerCoordinates.upperLeft[1]) -tr \(.geoTransform[1]) \(-.geoTransform[5])"') \
  -ot Byte \
  -of GTiff \
  -co TILED=YES \
  -co COMPRESS=ZSTD \
  -co BIGTIFF=YES \
  vychod-mask.gpkg vychod-mask.tif
  9. generate VRT of the mask 
    gdalbuildvrt vychod-mask.vrt vychod-mask.tif
  10. edit vychod.vrt and add VRTRasterBand from vychod-mask.vrt and save to vychod-with-mask.vrt; example: 
      ...
  <VRTRasterBand dataType="Byte" band="4">
    <ColorInterp>Alpha</ColorInterp>
    <SimpleSource>
      <SourceFilename relativeToVRT="1">vychod-mask.tif</SourceFilename>
      <SourceBand>1</SourceBand>
      <SourceProperties RasterXSize="775000" RasterYSize="898014" DataType="Byte" BlockXSize="256" BlockYSize="256" />
      <SrcRect xOff="0" yOff="0" xSize="775000" ySize="898014" />
      <DstRect xOff="0" yOff="0" xSize="775000" ySize="898014" />
    </SimpleSource>
  </VRTRasterBand>
</VRTDataset>
<!-- end of file -->
  11. create MBTiles 
    nice freemap-tiler --source-file vychod-with-mask.vrt --target-file vychod.mbtiles --max-zoom 19 --source-srs EPSG:8353 --jpeg-quality 85 --transform-pipeline "+proj=pipeline +step +inv +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +inv +proj=hgridshift +grids=Slovakia_JTSK03_to_JTSK.gsb +step +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +inv +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +proj=push +v_3 +step +proj=cart +ellps=bessel +step +proj=helmert +x=485.021 +y=169.465 +z=483.839 +rx=-7.786342 +ry=-4.397554 +rz=-4.102655 +s=0 +convention=coordinate_frame +step +inv +proj=cart +ellps=WGS84 +step +proj=pop +v_3 +step +proj=webmerc +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84"

### Czech republic

TODO

```sh
gdaltindex vychod-tileindex.gpkg -lyr_name index new/*.jpg

ogr2ogr \
-f GPKG \
vychod-tileindex-dissolved.gpkg \
vychod-tileindex.gpkg \
-nln dissolved \
-nlt POLYGON \
-dialect sqlite \
-sql "SELECT ST_Union(geom) AS geometry FROM 'index'" \
-a_srs EPSG:5514

ogr2ogr \
-f GPKG \
result.gpkg \
admin.gpkg \
-nln tiles \
-nlt POLYGON \
-dialect sqlite \
-sql "SELECT ST_Buffer(geom, 99.5, 16) AS geometry FROM administrative_units" \
-a_srs EPSG:5514

ogr2ogr -f GPKG -update -append result.gpkg vychod-tileindex-dissolved.gpkg -nln dissolved

ogr2ogr -f GPKG intersection.gpkg result.gpkg \
-dialect sqlite \
-sql "
 SELECT ST_Intersection(a.geometry, b.geometry) AS geometry
 FROM tiles a, dissolved b
 WHERE ST_Intersects(a.geometry, b.geometry)
" \
-nln intersection \
-nlt POLYGON \
-a_srs EPSG:5514

gdalbuildvrt vychod.vrt new/*.jpg

gdal_rasterize \
-burn 0 \
-at -i \
-init 255 \
-tap \
$(gdalinfo -json vychod.vrt | jq -r '"-te \(.cornerCoordinates.upperLeft[0]) \(.cornerCoordinates.lowerRight[1]) \(.cornerCoordinates.lowerRight[0]) \(.cornerCoordinates.upperLeft[1]) -tr \(.geoTransform[1]) \(-.geoTransform[5])"') \
-ot Byte \
-of GTiff \
-co TILED=YES \
-co COMPRESS=ZSTD \
-co BIGTIFF=YES \
intersection.gpkg \
vychod-alpha-mask.tif

To get transformation pipeline: projinfo -s EPSG:5514 -t EPSG:3857 --spatial-test intersects -o proj

nice cargo run --release -- --source-file /home/martin/14TB/CZ-ORTOFOTO/vychod/test.vrt --target-file /home/martin/14TB/CZ-ORTOFOTO//vychod/test.mbtiles --max-zoom 20 --source-srs EPSG:5514 --jpeg-quality 90 --bounding-polygon /home/martin/14TB/CZ-ORTOFOTO/vychod/test-bounds.geojson --transform-pipeline "+proj=pipeline +step +inv +proj=krovak +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +step +proj=push +v_3 +step +proj=cart +ellps=bessel +step +proj=helmert +x=570.8 +y=85.7 +z=462.8 +rx=4.998 +ry=1.587 +rz=5.261 +s=3.56 +convention=position_vector +step +inv +proj=cart +ellps=WGS84 +step +proj=pop +v_3 +step +proj=webmerc +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84"

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