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harvest-restrictions

Lifecycle:Stable

Scripts to create Generalized Forest Harvesting Restrictions - a "spatial representation of various land designations that stipulate, to varying degrees, limits on forest harvesting activity."

Method

Each source land designation / restriction is defined as a 'layer' in sources.json. Sources are defined in descending order of importance - if different sources overlap, data from the uppermost source takes priority.

key description
alias Key to uniquely identify the data source when processing (lower case, _ separated)
description Description of the data source
source_type Type of data - types of BCGW and FILE are supported
source For sources of type BCGW, the table name. For sources of type FILE, the url or path
layer For sources of type FILE, the layer to use within the file (optional)
query Query to subset data in source/layer - ECQL for BCGW sources, OGR SQL for files (optional)
primary_key The column holding primary key for the given source
field map Mapping of source column names to new column names
data Additional data to add to all records of the source, as key(column):value pair

The harvest_restriction key in the data field defines the level of restriction a the given source, where restrictions are:

harvest_restriction description
1 Protected
2 Prohibited
3 High Restricted
4 Medium Restricted
5 Low Restricted
6 No Special Restriction

For example, this defines National Parks - data come from the BCGW, all parks are included (no query), the name of interest is held in the column ENGLISH_NAME, and these features have a harvest_restriction of 1 (Protected):

    {
        "alias": "park_national",
        "description": "National Park",
        "source_type": "BCGW",
        "source": "WHSE_ADMIN_BOUNDARIES.CLAB_NATIONAL_PARKS",
        "primary_key": "NATIONAL_PARK_ID",
        "query": null,
        "field_mapper": {"name": "ENGLISH_NAME"},
        "data": {"harvest_restriction": 1}
    },

See source.schema.json for a full description.

Usage

  1. Edit sources.json as required

  2. Validate sources.json:

     python download.py --dry-run -v

  3. Download data to file:

     python download.py download -v

  4. Load downloaded files to database:

     python download.py cache2pg -v --out_table designations

  5. Run overlays, dump results to file, log result summaries to csv:

     ./harvest_restrictions.sh

Output files are:

  • harvest_restrictions.gdb.zip
  • log_land_designations.csv
  • log_harvest_restrictions.csv

Versioning

Note that logging of results over time is based on the output of git describe - for this to function effectively, tag releases with v<year>_<month>. When a new release has been tagged, update the list of releases to track in log.py.

designatedlands

This tool is a stripped down version of the designated lands script and could be used for that analysis by adding mine and oil and gas restriction levels to each source in sources.json. Note however that several components of designatedlands are not currently supported by this tool:

  • raster based analysis
  • config based pre-processing of input sources
  • adjustment of tiled processing to include the sliver of BC's official boundary not covered by 250k tiles
  • overlay of results with arbitrary admin or eco layer