Index: ps/trunk/binaries/data/mods/public/maps/random/rmgen/library.js
===================================================================
--- ps/trunk/binaries/data/mods/public/maps/random/rmgen/library.js
+++ ps/trunk/binaries/data/mods/public/maps/random/rmgen/library.js
@@ -10,6 +10,13 @@
  */
 const MAX_HEIGHT_RANGE = 0xFFFF / HEIGHT_UNITS_PER_METRE; // Engine limit, Roughly 700 meters
 const MIN_HEIGHT = - SEA_LEVEL;
+
+/**
+ * Length of one tile of the terrain grid in metres.
+ * Useful to transform footprint sizes of templates to the coordinate system used by getMapSize.
+ */
+const TERRAIN_TILE_SIZE = RMS.GetTerrainTileSize();
+
 const MAX_HEIGHT = MAX_HEIGHT_RANGE - SEA_LEVEL;
 // Default angle for buildings
 const BUILDING_ORIENTATION = - PI / 4;
Index: ps/trunk/source/graphics/MapGenerator.h
===================================================================
--- ps/trunk/source/graphics/MapGenerator.h
+++ ps/trunk/source/graphics/MapGenerator.h
@@ -132,6 +132,7 @@
 	static bool TemplateExists(ScriptInterface::CxPrivate* pCxPrivate, const std::string& templateName);
 	static std::vector<std::string> FindTemplates(ScriptInterface::CxPrivate* pCxPrivate, const std::string& path, bool includeSubdirectories);
 	static std::vector<std::string> FindActorTemplates(ScriptInterface::CxPrivate* pCxPrivate, const std::string& path, bool includeSubdirectories);
+	static int GetTerrainTileSize(ScriptInterface::CxPrivate* pCxPrivate);
 
 	std::set<std::wstring> m_LoadedLibraries;
 	shared_ptr<ScriptInterface::StructuredClone> m_MapData;
Index: ps/trunk/source/graphics/MapGenerator.cpp
===================================================================
--- ps/trunk/source/graphics/MapGenerator.cpp
+++ ps/trunk/source/graphics/MapGenerator.cpp
@@ -19,6 +19,7 @@
 
 #include "MapGenerator.h"
 
+#include "graphics/Terrain.h"
 #include "lib/timer.h"
 #include "ps/CLogger.h"
 #include "ps/Profile.h"
@@ -110,6 +111,7 @@
 	m_ScriptInterface->RegisterFunction<bool, std::string, CMapGeneratorWorker::TemplateExists>("TemplateExists");
 	m_ScriptInterface->RegisterFunction<std::vector<std::string>, std::string, bool, CMapGeneratorWorker::FindTemplates>("FindTemplates");
 	m_ScriptInterface->RegisterFunction<std::vector<std::string>, std::string, bool, CMapGeneratorWorker::FindActorTemplates>("FindActorTemplates");
+	m_ScriptInterface->RegisterFunction<int, CMapGeneratorWorker::GetTerrainTileSize>("GetTerrainTileSize");
 
 	// Parse settings
 	JS::RootedValue settingsVal(cx);
@@ -271,6 +273,12 @@
 	return self->m_TemplateLoader.FindTemplates(path, includeSubdirectories, ACTOR_TEMPLATES);
 }
 
+int CMapGeneratorWorker::GetTerrainTileSize(ScriptInterface::CxPrivate* UNUSED(pCxPrivate))
+{
+	return TERRAIN_TILE_SIZE;
+}
+
+
 bool CMapGeneratorWorker::LoadScripts(const std::wstring& libraryName)
 {
 	// Ignore libraries that are already loaded