Attributes map file

The L3DT attributes map file (AMF) stores the land type of each pixel in the height map. The 'amf.gz' extension indicates the AMF file has been compressed using the gzip algorithm.

The data is preceded by a 10-byte header containing the following information:

The map data itself has two bytes per pixel, the first being 'land type ID' and the second being 'climate ID'. The pixels are ordered in rows going west-to-east, with south-to-north row-order.

The climate ID value indicates the ID number of the relevant climate within the group climate list (which you can find in the Climates section of the project file). The land type ID indicates the ID number of the land type in that climate (see LandTypeList section of the climate file). You also can get the combined 2-byte values using the export type list option.

In L3DT v2.8 and later versions, the AMF file contains an additional list of climate names after the map data. This extra data consist of:

• A 32-bit integer for the number of climates.
• Then, for each climate:
  • A 32-bit integer for the climate name length.
  • The climate name, the length of which is given by the preceding integer. The string is not null-terminated.

This additional data is optional, and can be safely omitted or ignored.