feat(data): Add 2 initial datasets

records/glw4-2020/glw4-2020.yaml

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+# yaml-language-server: $schema=../../spec/schemas/profiles/cdh.schema.json
+"$schema": https://cgiar-climate-data-hub.github.io/cdh-metadata-standard/v0.2.0/schemas/profiles/cdh.schema.json
+cdh_schema_version: "v0.2.0"
+
+extensions:
+  - https://cgiar-climate-data-hub.github.io/cdh-metadata-standard/v0.2.0/extensions/cdh/schema.json
+  - https://cgiar-climate-data-hub.github.io/cdh-metadata-standard/v0.2.0/extensions/datacube/schema.json
+  - https://cgiar-climate-data-hub.github.io/cdh-metadata-standard/v0.2.0/extensions/agriculture/schema.json
+
+id: glw4-2020
+title: Gridded livestock density for 2020 (GLW4)
+series:
+  name: Gridded Livestock of the World (GLW)
+  url: https://www.fao.org/livestock-systems/global-distributions/en/
+description: >
+  Gridded Livestock of the World, version 4 (GLW 4) maps modelled densities of six livestock
+  species: buffalo, cattle, sheep, goats, pigs, and chickens. This data is for the 2020 reference
+  year. Densities are estimated with a Random Forest model that downscales harmonized subnational
+  census counts onto a regular grid, so the values represent modelled distributions rather than
+  direct observations. All of the values are number of animals per km^2
+license: CC-BY-4.0
+resource_type: dataset
+
+keywords:
+  - gridded
+  - modelled
+  - exposure
+  - term: animal husbandry
+    scheme: https://agrovoc.fao.org/
+    uri: http://aims.fao.org/aos/agrovoc/c_8532
+note: >
+  Values are densities (head/km²), so individual pixel values are valid anywhere. However, the data
+  are distributed in lat/long (EPSG:4326), where pixel ground area shrinks toward the poles. A
+  standard lat/long map visually over-represents high-latitude densities, and naive spatial
+  aggregation (totals, means, zonal statistics) assuming equal-area pixels will be biased. Reproject
+  to an equal-area projection or weight by true pixel area for visualization and area-based
+  analysis.
+
+contact:
+  - organization: Food and Agriculture Organization of the United Nations
+    roles: [licensor, producer, processor]
+    url: https://www.fao.org/home/en/
+  - name: Dominik Wisser
+    roles: [point-of-contact]
+    email: Dominik.Wisser@fao.org
+    organization: Food and Agriculture Organization of the United Nations
+  - name: Giuseppina Cinardi
+    roles: [point-of-contact]
+    email: giuseppina.cinardi@fao.org
+    organization: Food and Agriculture Organization of the United Nations
+  - name: Brayden Youngberg
+    roles: [processor, custodian]
+    email: b.youngberg@cgiar.org
+    organization: The Alliance of Bioversity International and CIAT
+
+citation:
+  title: "GLW 4: Gridded Livestock Density (Global - 2020 - 10 km)"
+  authors:
+    - Food and Agriculture Organization of the United Nations
+  date: "2024"
+  publisher: FAO Agro-Informatic Data Catalog
+  url: https://data.apps.fao.org/catalog/dataset/9d1e149b-d63f-4213-978b-317a8eb42d02
+related_publications:
+  - doi: 10.1371/journal.pone.0133381
+
+# metadata tracking
+created: "2026-06-23"
+updated: "2026-06-23"
+
+spatial:
+  bbox: [-180.0, -90.0, 180.0, 90.0]
+  geography: [world]
+  crs: EPSG:4326
+  resolution:
+    - type: xy
+      unit: degree
+      value: 0.08333333
+      label: 5 arc-minutes (~10km at equator)
+
+temporal:
+  date: "2020" # static 2020 reference year (year precision)
+
+dimensions:
+  - name: species
+    type: species
+    description: The livestock species for which the data is provided
+    values: [buffalo, cattle, chicken, goat, pig, sheep]
+
+variables:
+  - name: Livestock Density
+    description: Number of livestock per km2
+    data_type: float32
+    unit: "{head}/km-1"
+
+cdh:
+  not_recommended_for:
+    - use: exact livestock counts
+      reason: values are spatially modeled estimates derived from census and other data
+      use_instead: official livestock census counts where available
+  domain: [agricultural-production]
+
+commodities: [buffalo, cattle, chickens, goats, swine, sheep]
+
+processing:
+  - id: source
+    description: Original GLW 4 release
+    date: "2024-07-15"
+    derived_from:
+      - url: https://data.apps.fao.org/catalog//iso/9d1e149b-d63f-4213-978b-317a8eb42d02
+        title: GLW 4 2020
+  - id: cloud-optimize
+    description: Optimize data for cloud storage
+    date: "2026-06-23"
+    code:
+      url: https://github.com/CGIAR-Climate-Data-Hub/cdh-data-pipeline/blob/main/recipes/glw4.py
+      version: "885ed96"
+
+data:
+  - name: zarr
+    locations:
+      - url: https://digital-atlas.s3.amazonaws.com/cdh/data/glw4-2020/glw4-2020.zarr
+        title: HTTPS
+      - url: s3://digital-atlas/cdh/data/glw4-2020/glw4-2020.zarr
+        title: S3
+    processing_steps: [cloud-optimize]
+    description: Zarr store of GLW 4 2020
+    nodata: "NaN"
+    media_type: application/vnd.zarr; version=3
+    file_size: 31.1 MB
+  - name: cogs
+    locations:
+      - url: https://digital-atlas.s3.amazonaws.com/cdh/data/glw4-2020/cogs/
+        title: HTTPS
+      - url: s3://digital-atlas/cdh/data/glw4-2020/cogs/
+        title: S3
+    href_template: "glw4-2020-{species}.tif"
+    processing_steps: [cloud-optimize]
+    description: Cloud-optimized GeoTIFFs of GLW 4 2020
+    nodata: -3.4028235e+38
+    media_type: "image/tiff; application=geotiff; profile=cloud-optimized"
+
+additional_links:
+  - name: FAO Livestock Distributions
+    rel: related
+    url: https://www.fao.org/livestock-systems/global-distributions/en/
+  - name: FAOSTAT Crop and Livestock Production
+    rel: related
+    url: https://www.fao.org/faostat/en/#data/QCL