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Site quality and physiography

Topographic parameters (slope, aspect, altitude) and site quality metrics (site index at reference age) determining stand productive potential.

Plot-level variables

  • Plot_type — integer  •  dimensionless  •  output: PLOT_TYPE

    Inventory plot type or design (SNFI, circular, rectangular, etc.).

  • Plot_area — decimal  •  m2  •  output: PLOT_AREA

    Total area of the sample plot.

  • Slope — decimal  •  %  •  output: SLOPE

    Terrain slope expressed as percentage (%, where 45º equals 100%).

  • Aspect — decimal  •  rad  •  output: ASPECT

    Topographic aspect expressed in radians (0 to 2π, where 0 is North, π/2 East, π South, and 3π/2 West).

  • Continentality — decimal  •  km  •  output: CONTINENTALITY

    Minimum linear distance from the plot to the Mediterranean Sea coast. Used in regional models for Catalonia (e.g., ingrowth in Pinus nigra).

  • Longitude — decimal  •  deg  •  output: LON

    Geographic longitude coordinate of the plot in decimal degrees (WGS84 reference system, EPSG:4326).

  • Latitude — decimal  •  deg  •  output: LAT

    Geographic latitude coordinate of the plot in decimal degrees (WGS84 reference system, EPSG:4326).

  • Altitude — decimal  •  m  •  output: ALTITUDE

    Elevation of the plot above sea level.

Tree-level variables

  • longitude — decimal  •  deg  •  output: lon

    Geographic longitude coordinate of the individual tree position in decimal degrees (WGS84 reference system, EPSG:4326).

  • latitude — decimal  •  deg  •  output: lat

    Geographic latitude coordinate of the individual tree position in decimal degrees (WGS84 reference system, EPSG:4326).

  • x (coord_x) — decimal  •  m  •  output: x

    Cartesian spatial coordinate on the X axis (horizontal) of the tree position within the plot (local origin or UTM East), in meters.

  • y (coord_y) — decimal  •  m  •  output: y

    Cartesian spatial coordinate on the Y axis (vertical) of the tree position within the plot (local origin or UTM North), in meters.

  • z (coord_z) — decimal  •  m  •  output: z

    Cartesian spatial coordinate on the Z axis (elevation or relative/absolute height) of the tree base, in meters.

Translated using AI translation assistant.