Describe a vector layer before any analysis: CRS (and whether it is in degrees), feature count, missing/empty/invalid geometries, geometry types, bounds and fields with their null counts. Call this first on every layer.

Args: path: Path to a vector file (GeoPackage, Shapefile, GeoJSON, KML, FlatGeobuf...). layer: Layer name inside a multi-layer file such as a GeoPackage (optional).

Area in hectares of a polygon layer, in total and per stratum, measured in an equal-area CRS. Overlapping polygons are dissolved so ground is never counted twice, and the overlap inside each stratum and between strata is reported.

Args: path: Polygon layer (project area, strata, eligible area...). stratum_field: Attribute holding the stratum or class (optional). layer: Layer name inside a multi-layer file (optional). crs: Projected CRS to measure in, e.g. "EPSG:32720". If omitted, a local Lambert Azimuthal Equal Area projection centred on the data is used.

Compare areas declared in a project document (PD, monitoring report) with the areas calculated from the layer, and flag differences above a tolerance.

Args: path: Polygon layer with the project area or strata. declared_ha: Declared hectares, keyed by stratum value and/or "total", e.g. {"total": 8000, "dense_forest": 5200}. stratum_field: Attribute holding the stratum (needed for per-stratum keys). tolerance_pct: Accepted absolute difference in percent (default 1.0). layer: Layer name inside a multi-layer file (optional). crs: Projected CRS to measure in (optional, equal-area by default).

Overlap between two polygon layers (e.g. project area vs. protected areas, other registered projects, leakage belt or reference region): hectares, percentage of each layer and the largest overlapping feature pairs. Reports 0 ha explicitly.

Args: path_a: First polygon layer (usually the project area). path_b: Second polygon layer. id_field_a: Attribute used to name features of layer A (optional). id_field_b: Attribute used to name features of layer B (optional). layer_a: Layer name inside a multi-layer file A (optional). layer_b: Layer name inside a multi-layer file B (optional). crs: Projected CRS to measure in (optional, equal-area by default). max_pairs: Maximum number of overlapping pairs to list (default 20).

Check monitoring or inventory plots against the strata: plots outside every stratum (with distance), plots whose declared stratum differs from the stratum they fall in, plots on overlapping strata, plots close to the boundary and duplicated coordinates. Distances are measured in the local UTM zone unless a CRS is given.

Args: plots_path: Point layer with plot centres. strata_path: Polygon layer with the strata. stratum_field: Stratum attribute in the strata layer. plot_stratum_field: Stratum declared for each plot in the plots layer (optional). plot_id_field: Plot identifier attribute (optional). edge_distance_m: Flag plots closer than this to the strata boundary (0 = off). plots_layer: Layer name inside the plots file (optional). strata_layer: Layer name inside the strata file (optional). crs: Projected CRS for distances (optional).

Forest loss per year inside an area of interest from a local "lossyear" raster (e.g. a Hansen Global Forest Change tile, where 1 = 2001 ... 24 = 2024). Pixel areas are geodesic for rasters in degrees. Also reports how much of the area the raster actually covers, so a partial tile is never read as "no loss".

Args: aoi_path: Polygon layer with the area of interest (project area, leakage belt...). lossyear_raster: Path to the GeoTIFF with loss years. aoi_layer: Layer name inside a multi-layer AOI file (optional). start_year: First year to include, e.g. 2015 (optional). end_year: Last year to include, e.g. 2024 (optional). base_year: Year added to the raster value (2000 for Hansen GFC).

Completeness of the attributes of a layer: filled and missing values per field (blank text counts as missing) and number of distinct values.

Args: path: Vector layer to inspect. fields: Fields to check (optional, all fields by default). layer: Layer name inside a multi-layer file (optional).