Preprocessorcerer NPM

Preprocessorcerer

wip 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