Morrowind Mod:Mod File Format/LAND

LAND records contain information about the landscape of exterior cells. More specifically, it defines 65x65 arrays of vertex heights, normals, colors, and a smaller 16x16 array of textures. It also defines a 9x9 array of heights that the game can load to quickly build the world map.

C	Field	Type/Size	Info
+	INTV	struct (8 bytes)	Coordinates int32 - X int32 - Y
+	DATA	uint32	Data types included. If the relevant bit isn't set, the related fields will not be loaded, even if present. 0x01 = Includes VNML, VHGT and WNAM 0x02 = Includes VCLR 0x04 = Includes VTEX
-	VNML	struct (12,675 bytes)	Vertex Normals. A 65×65 array of: int8 - X int8 - Y int8 - Z Note that the Y-direction of the data is from the bottom up.
-	VHGT	struct (4,232 bytes)	Height Data float32 - A height offset for the entire cell. Decreasing this value will shift the entire cell land down (by 8 units).[verification needed — Oblivion and Skyrim use 8 units, is this the same?] int8[65][65] - Contains the height data for the cell in the form of a 65×65 pixel array. The height data is not absolute values but uses differences between adjacent pixels. Thus a pixel value of 0 means it has the same height as the last pixel. Note that the Y-direction of the data is from the bottom up. uint8[3] - Junk data (ignored)
-	WNAM	uint8[9][9]	Heights for world map. Derived from VHGT data.
-	VCLR	struct (12,675 bytes)	Vertex Colors. A 65×65 array of RGB (no alpha) values.
-	VTEX	uint16[16][16]	Texture Indices. Each value corresponds to the Index (INTV) value from a LTEX record.