# catalog/operations/raster/mosaic.yaml

id: raster_mosaic
name: Mosaic
description: >
  Mosaic multiple rasters together into a single raster. All input rasters
  must have the same CRS. Supports various methods for handling overlapping
  pixels.
version: 1.0.0
category: raster
type: raster-to-raster
default_implementation: native

inputs:
  - name: rasters
    type: raster[]
    format: geotiff
    description: List of rasters to mosaic together
    required: true

requires: {}  # structural — operates on any raster

outputs:
  - name: mosaic
    type: raster
    format: cog
    description: Mosaicked raster combining all inputs

params:
  method:
    type: enum
    default: first
    enum: [first, last, max, min, mean]
    description: >
      Method for handling overlapping pixels:
      - first: use value from first raster
      - last: use value from last raster
      - max: use maximum value
      - min: use minimum value
      - mean: use mean value
  nodata:
    type: number
    description: Output nodata value (uses source nodata if not specified)

granularity:
  min_resolution_m: 0.1
  max_resolution_m: 100000
  output_resolution: inherit
  requires_continuous: false
  suitable_aoi_km2:
    min: 0.01
    max: 1000000
  realtime_max_km2: 1000

execution:
  realtime_max_km2: 1000
  cost_per_km2: 0.001
  time_per_km2_sec: 0.3
  memory_profile: medium
  profile:
    cpu: low
    memory: medium
    io: high
  scaling:
    model: linear
    parallelizable: true
    min_chunk_km2: 1

cache_policy:
  ttl_days: 30
  invalidate_on: [source_update]

# backends: audited 2026-08-14 (defect 50). A key means a runtime that DISPATCHES this op —
# folia-engine `dispatch_op` (products/sdk/folia-engine/src/lib.rs), a `registerOp`/OP_TABLE
# entry in packages/compute, `_BUILTIN_OP_MAP` in folia/compute.py, or a backend manifest
# (folia/backends/*/backend.yaml).
backends:
  python:
    function: geo.raster.mosaic
    dispatch: folia/compute.py _BUILTIN_OP_MAP

display_hints:
  map:
    renderer: maplibre

ui:
  icon: layers
  color: "#9370DB"