Preprocessorcerer
Makes magical adjustments to geospatial files
Usage
perform-preprocessorcery /some/folder/file.tif
# {"outfile":"/some/folder/eddd5fb92364d75d","parts":1,"descriptions":["Reproject TIFF file to EPSG:3857"]}Potential Preprocessorcery
This table lists the various preprocessing steps that a file might undergo. These steps are written in the preprocessors folder, each file representing a distinct preprocessing step. Each preprocessor exposes a criteria function that determines whether or not it should act on the incoming file. The order of this list is the order in which preprocessors would be applied to any single file that matches multiple criteria.
| preprocessor | criteria | description |
|---|---|---|
| tif-toBytes | TIF file with 16-bit pixels | Scale 16-bit TIFF files to 8-bit |
| tif-reproject | TIF file that is not in EPSG:3857 | Reproject TIFF file to EPSG:3857 |
| tif-overviews | TIF file | Generate overviews for TIFF files |
| shp-index | Shapefile that has no mapnik index | Add a spatial index to shapefile |
| geojson-bom | GeoJSON string with a BOM char | Remove a byte-order-mark from a geojson string |
| spatial-index | GeoJSON or CSV has no mapnik index | Add spatial index (*.index) to GeoJSON or CSV |
Part Splitting
| splitter | criteria | description |
|---|---|---|
| mbtiles-byTiles | mbtiles file | 100,000 tiles per part, up to 50 parts max |
| serialtiles-byTiles | serialtiles file | 200,000 tiles per part, up to 50 parts max |
| default | none of above criteria matched | Split into parts based on file size |