The .#map file format (stored in rage::fwMapDataStore) is a PSO/RSC-style format expecting a CMapData (project-specific, inherits from rage::fwMapData) root element.
Formerly, this would be placed in a .#pl file. .#map is also known as .imap in North naming conventions.
The #map format has the following structure:
CMapData
fwMapData
| Field | Type | Description | 
| name | string/hash | Unused name of the map data file itself. | 
| parent | string/hash | Reference to the parent of the map data file, for LOD indexing. | 
| flags | u32 | … | 
| contentFlags | u32 | Flags describing the map data contents. See Content Flags. | 
| streamingExtentsMin | Vec3V | Streaming AABB, mins, determining when the box streamer should load the mapdata. | 
| streamingExtentsMax | Vec3V | Streaming AABB, maxs. | 
| entitiesExtentsMin | Vec3V | Entity AABB, mins. | 
| entitiesExtentsMax | Vec3V | Entity AABB, maxs. | 
| entities | array of rage::fwEntityDef | Entities to create. | 
| containerLods |  |  | 
| boxOccluders |  | Boxes used for occluding game world models (blocking rendering inside buildings). | 
| occludeModels |  | Simplified models used for occluding game world models (blocking rendering below terrain). | 
| physicsDictionaries | string/hash | Models list with imbedded collisions used in this file. | 
| instancedData |  | Instanced entities like grass or small rocks placed in separate #map file. | 
 
entities
Object placement, rotation and additional features.
| Field | Type | Description | 
| archetypeName | string | Name of the object defined in #typ files. | 
| flags | u32 | Specific feature applied to this particular entity. | 
| guid | u32 | Globally Unique Identifier, mostly unused in mods. | 
| position | Vec3V | Position of entity, in x,y,z. | 
| rotation | Vec4V | Rotation of entity in quaternions. | 
| scaleXY | float | Scale of entity in X and Y axis. | 
| scaleZ | float | Scale of entity in Z axis. | 
| parentIndex | int | Index linkage to lower detailed entity in parent#map file. | 
| lodDist | float | Draw distance of entity, in meters. | 
| childLodDist | float | Draw distance of linked child entity, in meters. | 
| lodLevel | string | LOD level type of entity, important for LOD linking. | 
| numChildren | int | Value of linked children entities. | 
| priorityLevel | string | Priority of drawing entites, especially used in GTAO to avoid unnecessary entities to load. | 
| extensions | array | Additional particle/sound effects attached to archetypes. | 
| ambientOcclusionMultiplier | int | Strength of ambient occlusion. | 
| artificialAmbientOcclusion | int | Strength of artificial ambient occlusion, coming from lampposts, lights etc… | 
| tintValue | int | Switches a row for tint palette texture. | 
| groupId | int | Unknown usage. | 
| floorId | int | Unknown usage. | 
| defaultEntitySets | array | Group of entities enabled by default. | 
| numExitPortals | int | Number of portals with roomTovalue set to 0. | 
| MLOInstflags | int | Attributes for MLO instance. | 
 
CMapData
| Field | Type | Description | 
| timeCycleModifiers |  | Modifies weather/lighting settings for specific area. | 
| carGenerators |  | Allows to spawn vehicles spread in game world. | 
| LODLightsSOA |  | Instanced low detailed lights spawned across the map. | 
| DistantLODLightsSOA |  | Instanced distant low detailed lights spawned across the map, linked to LODLightsSOA. | 
| block | CBlockDesc | Metadata for this map block. | 
 
Entity flags
flags
| Flag | Decimal | Meaning | 
| 0x1 | 1 | Allows full rotation for entity. | 
| 0x2 | 2 | Do not delete the entity during streaming cleanup (out-of-memory situations) even if the entity is invisible. Usually used for dynamic objects where deleting the entity would result in moving the object back to its original position. | 
| 0x4 | 4 | Disables embedded collision, works for entites using 0x20000/131072 archetype flag. | 
| 0x8 | 8 | Used for entities linking to another entity in parent #map file. | 
| 0x10 | 16 | Unknown usage. | 
| 0x20 | 32 | This flag enables a indestructibility for archetype, making it static for props. | 
| 0x40 | 64 | Unknown usage. | 
| 0x80 | 128 | Unknown usage. | 
| 0x100 | 256 | Unknown usage. | 
| 0x200 | 512 | Disables embedded light source for #dr models. | 
| 0x400 | 1024 | Unknown usage. | 
| 0x800 | 2048 | Unknown usage. | 
| 0x1000 | 4096 | Unknown usage. | 
| 0x2000 | 8192 | Unknown usage. | 
| 0x4000 | 16384 | Unknown usage. | 
| 0x8000 | 32768 | Unknown usage. | 
| 0x10000 | 65536 | Unknown usage. | 
| 0x20000 | 131072 | Unknown usage. | 
| 0x40000 | 262144 | Disable archetype extensions for #dr models. | 
| 0x80000 | 524288 | Unknown usage. | 
| 0x100000 | 1048576 | Unknown usage. | 
| 0x200000 | 2097152 | Unknown usage. | 
| 0x400000 | 4194304 | Disables sun shadow for entity. | 
| 0x800000 | 8388608 | Disables entity but sun shadow is casted. | 
| 0x1000000 | 16777216 | Entity will not cast reflections. | 
| 0x2000000 | 33554432 | Marks that entity is a interior proxy. | 
| 0x4000000 | 67108864 | Marks that entity doesn’t render in water reflections. | 
| 0x8000000 | 134217728 | Marks that entity is a reflection proxy. | 
| 0x10000000 | 268435456 | Unknown usage. | 
| 0x20000000 | 536870912 | Marks that entity is a mirror proxy. | 
| 0x40000000 | 1073741824 | Unknown usage. | 
| 0x80000000 | 2147483648 | Unknown usage. | 
 
Flags
A bit mask of flags.
| Flag | Decimal | Meaning | 
| 0x1 | 1 | This flag forces file to be enabled/disabled by REQUEST_IPL native. | 
| 0x2 | 2 | This flag is set to determine LOD objects in entities array. | 
 
Content Flags
A bit mask of flags.
| Flag | Decimal | Meaning | 
| 0x1 | 1 | This map contains physics instances. | 
| 0x2 | 2 | This map contains LOD entities. | 
| 0x4 | 4 | This map contains LOD entities type, as SLOD2 and higher. | 
| 0x8 | 8 | This map contains interior instance. | 
| 0x10 | 16 | This map contains SLOD1 entities type. | 
| 0x20 | 32 | This map contains box/model occluders. | 
| 0x40 | 64 | This map contains physics instances. | 
| 0x80 | 128 | This map contains LOD lights. | 
| 0x100 | 256 | This map contains distant LOD lights. | 
| 0x200 | 512 | This map is ‘critical’ and should be placed in the ‘critical’ box streamer slot. Used for maps with tall objects such as lamp posts and trees. | 
| 0x400 | 1024 | This map contains grass instances from instancedData in fwMapData. | 
 
timeCycleModifiers
Weather modifier settings.
| Parameter | Meaning | 
| name | Name of the modifier, taken from timecyc_mods_1-4 in update.rpf/common/data/timecycle | 
| minExtents | Bottom-left corner of bounding box | 
| maxExtents | Top-right corner of bounding box | 
| percentage | Strength of modifier | 
| range | Strength of modifier when close to the bounding box | 
| startHour | Modifier will be enabled at this hour | 
| endHour | Modifier will be disabled at this hour | 
 
carGenerators
Vehicle placement.
| Parameter | Meaning | 
| position | Position of vehicle placement, in x,y,z. | 
| orientX |  | 
| orientY |  | 
| perpendicularLength | Perpendicular length of placed vehicle. | 
| carModel | Vehicle name, randomly spawned while empty. | 
| flags | Special attributes for vehicle spawning. | 
| bodyColorRemap1 | Primary vehicle color, value taken from carcols.#mt | 
| bodyColorRemap2 | Secondary vehicle color, value taken from carcols.#mt | 
| bodyColorRemap3 | Teritary vehicle color, value taken from carcols.#mt | 
| bodyColorRemap4 | Quaternary vehicle color, value taken from carcols.#mt | 
| popGroup | Vehicle group name, choosing one of the vehicles defined in group, taken from popgroups.#mt | 
| livery | Value of livery to be assinged on a vehicle, barely used. | 
 
             
            
              
              
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