Preparing S-57 data using enc_processor tool

S-57 source data can be converted to MBTiles using the tool enc_processor. The output is split into one MBTiles dataset for each scaleband. Some layers are given custom fields to facilitate rendering in MARIA GDK. Zoom level configuration in the output is defined to work with the existing product NorwayNauticalENCVector.

Processing all scalebands for Norway typically takes 7-9 hours on a fast computer and SSD.

scalebands = {
    1 : {'name':'Overview', 'minzoom':3, 'maxzoom':12},
    2 : {'name':'General', 'minzoom':10, 'maxzoom':13},
    3 : {'name':'Coastal', 'minzoom':10, 'maxzoom':13},
    4 : {'name':'Approach', 'minzoom':13, 'maxzoom':16},
    5 : {'name':'Harbor', 'minzoom':14, 'maxzoom':17},
    6 : {'name':'Berthing', 'minzoom':14, 'maxzoom':17},
}

Dependencies

When this tool is distributed as command-line tool enc_processor.exe, it can be run on the Windows with no external dependencies.

When distributed as a Python wheel, it depends on the following non-standard Python packages:

• GDAL
• protobuf

Arguments

Argument	Description
input	Input folder containing S-57 "000" files. Folders are searched recursively.
output	Output folder where MBTiles will be built
--outputtype	product to create a fully compatible product with styling and data. files to create data files only. Default is product
--name	Name to use for output product and dataset. If not provided, the name of the input folder will be used.
--debug	Write debug log messages

Examples

Command-line tool

Display help:

enc_processor.exe --help

Convert a directory tree of S-57 files to a fully compatible product which can be read directly by any Maria-based application:

enc_processor.exe "c:\work\oslofjord\enc_root\" "c:\work\enc\output" --name "NorwayOslofjordNautical"

Python module

Display help:

python -m enc_processor --help

Convert a directory tree of S-57 files to MBTiles, with detailed log messages:

python -m enc_processor "c:\work\enc\enc_root\" "c:\work\enc\mbtiles\" --outputtype "files" --debug