geopackage-optimizer-go

geopackage-optimizer

Optimizes GeoPackage so that it can be used as datasource for (PDOK) OGC services and APIs.

Build

docker build pdok/geopackage-optimizer-go .

Run

Usage of /optimizer:
  -config string
        optional JSON config for additional optimizations
  -s string
        source geopackage (default "empty")
  -service-type string
        service type to optimize geopackage for (default "ows")

TL;DR

Run from the root of this repo (note modifies testdata/original.gpkg):

docker run \
  -v testdata:/testdata \
  pdok/geopackage-optimizer-go:latest "/testdata/original.gpkg"

Optimizations

OGC webservices

With flag -service-type ows:

• create index PUUID using UUID4
• create index FUUID using [tablename].[PUUID]
• can add (unique) indices on specified columns

This ensures that there are randomly generated UUID's usable as index, which has a couple of advantages:

• having an index is good for performance
• having a UUID instead of an incremental ID prevents crawling
• having a UUID prevents users from creating applications that assumes that id has meaning and will not change in the future

docker run -v `pwd`/testdata:/testdata pdok/geopackage-optimizer-go 
    /testdata/original.gpkg 
    -service-type ows 
    -config '{"indices":[{"name": "my_index", "table": "mytable", "unique": false, "columns": ["mycolumn1", "mycolumn2"]}]}'

OGC API Features

With flag -service-type oaf:

• create BTree equivalent of an RTree spatial index
• create index for temporal columns
• create indexed column with an "external feature id" (external_fid). This external FID is a UUID v5 based on one or more given columns that are functionally unique across time.

Above optimizations primarily target OGC API Features served through GoKoala.

Example:

docker run -v `pwd`/testdata:/testdata pdok/geopackage-optimizer-go 
    /testdata/original.gpkg 
    -service-type oaf 
    -config '{"layers":{"mytable":{"external-fid-columns":["fid"]}}}'

Relations

Optionally, one can add relations between features using this tool. This is in support of OAF Part 5 Feature References.

Relations are only supported when external-fid-columns are defined. Use a config like:

docker run -v `pwd`/testdata:/testdata pdok/geopackage-optimizer-go 
    /testdata/somepkg.gpkg 
    -service-type oaf 
    -config '{"layers":{"table1":{"external-fid-columns":["foo","bar"]},"table2":{"external-fid-columns":["foo","bar","bazz"],"relations":[{"table":"table1","columns":{"keys":[{"fk":"foo","pk":"foo"},{"fk":"bar","pk":"bar"}]}}]}}}'