diff --git a/CMakeLists.txt b/CMakeLists.txt
index d23851b..1413eb1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -106,6 +106,7 @@ set(mapper_SRCS
 
 if(USE_LEVELDB)
 	set(mapper_SRCS ${mapper_SRCS} db-leveldb.cpp)
+	set(mapper_SRCS ${mapper_SRCS} db-leveldbfm.cpp)
 endif(USE_LEVELDB)
 
 if(USE_REDIS)
diff --git a/TileGenerator.cpp b/TileGenerator.cpp
index 2406f7d..65016eb 100644
--- a/TileGenerator.cpp
+++ b/TileGenerator.cpp
@@ -16,6 +16,7 @@
 #include "db-sqlite3.h"
 #if USE_LEVELDB
 #include "db-leveldb.h"
+#include "db-leveldbfm.h"
 #endif
 #if USE_REDIS
 #include "db-redis.h"
@@ -294,6 +295,8 @@ void TileGenerator::openDb(const std::string &input)
 #if USE_LEVELDB
 	else if(m_backend == "leveldb")
 		m_db = new DBLevelDB(input);
+	else if(m_backend == "leveldbfm")
+		m_db = new DBLevelDBFM(input);
 #endif
 #if USE_REDIS
 	else if(m_backend == "redis")
diff --git a/db-leveldb.cpp b/db-leveldb.cpp
index 849384a..b99ce09 100644
--- a/db-leveldb.cpp
+++ b/db-leveldb.cpp
@@ -28,7 +28,8 @@ DBLevelDB::DBLevelDB(const std::string &mapdir)
 		throw std::runtime_error(std::string("Failed to open Database: ") + status.ToString());
 	}
 
-	loadPosCache();
+	if(!no_load)
+		loadPosCache();
 }
 
 
diff --git a/db-leveldb.h b/db-leveldb.h
index 8128ee9..500d014 100644
--- a/db-leveldb.h
+++ b/db-leveldb.h
@@ -6,13 +6,14 @@
 
 class DBLevelDB : public DB {
 public:
-	DBLevelDB(const std::string &mapdir);
+	DBLevelDB(const std::string &mapdir, bool no_load = 0);
 	virtual std::vector<BlockPos> getBlockPos();
 	virtual void getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos);
 	~DBLevelDB();
 private:
 	void loadPosCache();
 
+protected:
 	std::vector<BlockPos> posCache;
 
 	leveldb::DB *db;
diff --git a/db-leveldbfm.cpp b/db-leveldbfm.cpp
new file mode 100644
index 0000000..82b1f2d
--- /dev/null
+++ b/db-leveldbfm.cpp
@@ -0,0 +1,69 @@
+#include <sstream>
+#include "db-leveldbfm.h"
+#include "types.h"
+
+static inline int64_t stoi64(const std::string &s)
+{
+	std::stringstream tmp(s);
+	int64_t t;
+	tmp >> t;
+	return t;
+}
+
+DBLevelDBFM::DBLevelDBFM(const std::string &mapdir) : DBLevelDB(mapdir, 1)
+{
+	loadPosCache();
+}
+
+DBLevelDBFM::~DBLevelDBFM()
+{
+}
+
+std::string getBlockAsString(const BlockPos &pos) {
+	std::ostringstream os;
+	os << "a" << pos.x << "," << pos.y << "," << pos.z;
+	return os.str().c_str();
+}
+
+BlockPos DBLevelDBFM::getStringAsBlock(const std::string &i)  {
+	std::istringstream is(i);
+	BlockPos pos;
+	char c;
+	if (i[0] == 'a') {
+		is >> c; // 'a'
+		is >> pos.x;
+		is >> c; // ','
+		is >> pos.y;
+		is >> c; // ','
+		is >> pos.z;
+	} else { // old format
+		return decodeBlockPos(stoi64(i));
+	}
+	return pos;
+}
+
+void DBLevelDBFM::loadPosCache()
+{
+	leveldb::Iterator * it = db->NewIterator(leveldb::ReadOptions());
+	for (it->SeekToFirst(); it->Valid(); it->Next()) {
+		posCache.push_back(getStringAsBlock(it->key().ToString()));
+	}
+	delete it;
+}
+
+void DBLevelDBFM::getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos)
+{
+	std::string datastr;
+	leveldb::Status status;
+
+	for (std::vector<BlockPos>::iterator it = posCache.begin(); it != posCache.end(); ++it) {
+		if (it->z != zPos) {
+			continue;
+		}
+		status = db->Get(leveldb::ReadOptions(), getBlockAsString(*it), &datastr);
+		if (status.ok()) {
+			Block b(*it, ustring((const unsigned char *) datastr.data(), datastr.size()));
+			blocks[b.first.x].push_back(b);
+		}
+	}
+}
diff --git a/db-leveldbfm.h b/db-leveldbfm.h
new file mode 100644
index 0000000..015601a
--- /dev/null
+++ b/db-leveldbfm.h
@@ -0,0 +1,18 @@
+#ifndef DB_LEVELDBFM_HEADER
+#define DB_LEVELDBFM_HEADER
+
+#include "db-leveldb.h"
+#include <leveldb/db.h>
+
+class DBLevelDBFM : public DBLevelDB {
+public:
+	DBLevelDBFM(const std::string &mapdir);
+	virtual void getBlocksOnZ(std::map<int16_t, BlockList> &blocks, int16_t zPos);
+	~DBLevelDBFM();
+
+protected:
+	BlockPos getStringAsBlock(const std::string &i);
+	virtual void loadPosCache();
+};
+
+#endif // DB_LEVELDBFM_HEADER
diff --git a/mapper.cpp b/mapper.cpp
index a661511..46dea59 100644
--- a/mapper.cpp
+++ b/mapper.cpp
@@ -34,7 +34,7 @@ void usage()
 			"  --noshading\n"
 			"  --min-y <y>\n"
 			"  --max-y <y>\n"
-			"  --backend <sqlite3/leveldb/redis>\n"
+			"  --backend <sqlite3/leveldb/leveldbfm/redis>\n"
 			"  --geometry x:y+w+h\n"
 			"Color format: '#000000'\n";
 	std::cout << usage_text;