diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+              GNU GENERAL PUBLIC LICENSE
+                Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+              END OF TERMS AND CONDITIONS
+
+     How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/bindings-saga-cmd.cabal b/bindings-saga-cmd.cabal
new file mode 100644
--- /dev/null
+++ b/bindings-saga-cmd.cabal
@@ -0,0 +1,65 @@
+name:                bindings-saga-cmd
+version:             0.1.0.0
+synopsis:            Wrapping saga_cmd
+description:         A simple wrapper around the command-line version of the GIS-program saga
+homepage:            https://github.com/michelk/bindings-saga-cmd.hs
+
+license:             GPL-3
+license-file:        LICENSE
+author:              Michel Kuhlmann
+maintainer:          michel.kuhlmann@tkconsult.ch
+category:            Math
+build-type:          Simple
+cabal-version:       >=1.8
+
+source-repository head
+  type:     git
+  location: https://github.com/michelk/bindings-saga-cmd.hs
+
+library
+  exposed-modules:   Gis.Saga.Types
+                     Gis.Saga.Cmd
+                     Gis.Saga.Data
+                     Gis.Saga.Utils
+                     Gis.Saga.LUT
+                     Gis.Saga.Doc
+                     Gis.Saga.Node
+  build-depends:     base >=4.3 && < 5,
+                     filepath,
+                     process,
+                     containers,
+                     directory,
+                     unix
+  hs-source-dirs:    src
+
+executable sagaPipe
+  main-is:           sagaPipe.hs
+  build-depends:     base  >=4.3 && < 5,
+                     filepath,
+                     cmdargs,
+                     process,
+                     text,
+                     containers,
+                     directory,
+                     unix,
+                     bindings-saga-cmd
+  hs-source-dirs:    src
+
+executable sagaTopo
+  main-is:           sagaTopo.hs
+  build-depends:     base  >=4.3 && < 5,
+                     filepath,
+                     cmdargs,
+                     process,
+                     text,
+                     containers,
+                     directory,
+                     unix,
+                     bindings-saga-cmd
+  hs-source-dirs:    src
+
+executable sagaLut
+  main-is:           sagaLut.hs
+  build-depends:     base  >=4.3 && < 5,
+                     bindings-saga-cmd
+  hs-source-dirs:    src
diff --git a/src/Gis/Saga/Cmd.hs b/src/Gis/Saga/Cmd.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Cmd.hs
@@ -0,0 +1,95 @@
+module Gis.Saga.Cmd where
+import           Data.Map (elems)
+import qualified Data.Map as M
+import           Data.Maybe (fromMaybe, fromJust)
+import           GHC.IO.Exception
+import           Gis.Saga.Types
+import           Gis.Saga.Utils
+import           System.Process (system)
+import           System.Posix.Temp (mkdtemp)
+import           System.FilePath.Posix (replaceDirectory, joinPath)
+import           System.Directory (getTemporaryDirectory)
+
+-- | Actual Program to do the work
+progName :: String
+progName = "saga_cmd"
+
+-- | Call saga with a specific configuration
+doSaga :: SagaCmd -> IO FilePath
+doSaga (SagaCmd lib mod (kIn, kOut) ps maybePre maybePost fOut fIn) = do
+   pre fIn fOut
+   r <- saga lib mod (elems ps ++ [(kIn,fIn),(kOut,fOut)])
+   case r of
+       ExitSuccess -> do
+           post fIn fOut
+           return fOut
+       ExitFailure _ -> error "saga_cmd failed"
+   where
+     pre  = fromMaybe nthn maybePre
+     post = fromMaybe nthn maybePost
+     nthn _ _ =  return ()
+
+
+-- | Wrapper around saga
+saga ::
+       String                   -- ^ Library name
+    -> String                   -- ^ Module name
+    -> [(String,String)]        -- ^ Parameter key-value
+    -> IO ExitCode              -- ^ Output-file
+saga lib mod params =
+ do putStrLn cmd
+    system cmd
+  where
+    renderParams = map renderPara
+    renderPara (k,v) = "-" ++ k ++ "=" ++ v
+    cmd = unwords [
+        progName
+       ,lib
+       ,mod
+       ,unwords . renderParams  $ params
+       ]
+
+
+-- | adjust default parameters with the ones given on the command-line
+adjustSagaCmdParas :: CmdPars ->  SagaCmd -> SagaCmd
+adjustSagaCmdParas cmdPrs cmd@(SagaCmd{sParas = libPrs}) =
+  cmd {sParas = adjustParas libPrs cmdPrs}
+
+-- | Overwrite default parameters with parameters given on the command-line
+adjustParas :: ParaMap          -- ^ parameters specified in 'SagaCmd'
+               -> CmdPars       -- ^ parameters given on the cmd-line
+               -> ParaMap       -- ^ adjusted parameters
+adjustParas libPrs cmdPrs = M.mapWithKey lkp m'
+  where
+    -- | union of cmd-pars and lib-pars; this overwrites the defaults
+    m  = M.union cmdPrs $ M.map snd libPrs
+    -- | select relevant pars
+    m' = M.filterWithKey (\k _ -> k `elem` M.keys libPrs) m
+    lkp k v = (fst $ fromJust (M.lookup k libPrs), v)
+
+-- | Execute a 'SagaIoCmdExt'
+doCmdChain :: [SagaIoCmdExt] -> CmdPars -> FilePath -> Maybe FilePath -> IO FilePath
+doCmdChain chain pars fIn fOut = do
+  let outFsDefault = tail $ scanl appendFileName fIn (map snd chain)
+  outFs <- case fOut of
+    Nothing -> return outFsDefault
+    Just f  -> do
+      dtempDir <- getTemporaryDirectory
+      let dtempT = joinPath [dtempDir, "sagaPipe"]
+      dtemp <- mkdtemp dtempT
+      return $ map (`replaceDirectory` dtemp) (init outFsDefault) ++ [f]
+  let chain' = map (\(f,ext) -> f ext) $ zip (map fst chain) outFs
+  foldl (\fOut f -> do
+            fIn' <- fOut
+            doSaga . adjustSagaCmdParas pars . f $ fIn'
+        ) (return fIn) chain'
+
+-- | Lookup a chain
+lkpChain :: SagaIoCmdDB -> [String] -> [SagaIoCmdExt]
+lkpChain db = map (`lkpCmd` db)
+
+-- | Lookup a single command
+lkpCmd :: String -> SagaIoCmdDB -> SagaIoCmdExt
+lkpCmd  s db = fromMaybe (error "Command is not yet implemented") $ M.lookup s db
+
+
diff --git a/src/Gis/Saga/Data.hs b/src/Gis/Saga/Data.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Data.hs
@@ -0,0 +1,141 @@
+module Gis.Saga.Data where
+import Gis.Saga.Types
+import Gis.Saga.Utils
+import System.Directory (removeFile)
+import qualified Data.Map as M
+
+-- | Implemented command for piping
+sIoDB :: SagaIoCmdDB
+sIoDB = M.fromList [
+  ("xyzGridToGrid", (
+      SagaCmd "io_grid" "6" ("FILENAME","GRID") -- library, module, input-,output-parameters
+              (M.fromList [     --  parameters: sagaPipe-par, saga_cmd-par, default
+                   ("cs",  ("CELLSIZE"  , "1"))
+                  ,("sep", ("SEPARATOR" , "space"))
+                  ])
+              Nothing Nothing   -- pre-, post-processing
+      , ".sgrd"                 --  output-file extension
+      )
+  )
+  ,("lasToPtCld", (
+       SagaCmd "io_shapes_las" "1" ("FILE", "POINTS")
+       (M.fromList []) Nothing Nothing , ".spc"))
+  ,("ptCldToGrid", (
+       SagaCmd "pointcloud_tools" "4" ("POINTS","GRID")
+       (M.fromList [
+                   ("cs",  ("CELLSIZE"  , "1"))
+                   ])
+       Nothing Nothing ,".sgrd"))
+  ,("gridFillGaps", (
+       SagaCmd "grid_spline" "5" ("GRIDPOINTS","GRID_GRID")
+       (M.fromList [("grdFlT", ("TARGET", "1"))])
+       (Just copyGrid) Nothing, "_filled.sgrd"))
+  ,("gridHillshade", (
+       SagaCmd "ta_lighting" "0" ("ELEVATION","SHADE")
+       (M.fromList []) Nothing Nothing , "_hillshade.sgrd"))
+  ,("gridContour", (
+       SagaCmd "shapes_grid" "5" ("INPUT","CONTOUR")
+       (M.fromList [
+            ("min" , ("ZMIN"  , "0"))
+           ,("max" , ("ZMAX" , "10000"))
+           ,("d",    ("ZSTEP" , "1"))
+           ]) Nothing Nothing, "_contour.sgrd"))
+  ,("gridPolyClip", (
+       SagaCmd "shapes_grid" "7" ("INPUT","OUTPUT")
+       (M.fromList [
+           ("poly" , ("POLYGONS"  , "1"))
+           ]) Nothing Nothing, "_polyClip.sgrd"))
+  ,("gridTifHillshade", (
+       SagaCmd "io_grid_image" "0" ("GRID","FILE")
+       (M.fromList [
+           ("pal" ,  ("COL_PALETTE", "2"))
+          ,("colRev",("COL_REVERT" , "1"))
+          ,("min",("STRETCH_MIN" , "0"))
+          ,("max",("STRETCH_MAX" , "1.571"))
+          --,("stddev",("STDDEV"   , "2"))
+          --,("col",("COLOURING"   , "2"))
+           ]) Nothing Nothing, ".tif"))
+  ,("gridTifTerrain", (
+       SagaCmd "io_grid_image" "0" ("GRID","FILE")
+       (M.fromList [
+           ("pal" ,  ("COL_PALETTE", "23"))
+          --,("colRev",("COL_REVERT" , "1"))
+          ,("min",("STRETCH_MIN" , "0"))
+          ,("max",("STRETCH_MAX" , "100"))
+          --,("stddev",("STDDEV"   , "2"))
+          ,("col",("COLOURING"   , "2"))
+           ]) Nothing Nothing, ".tif"))
+  ,("gridTifGdal", (
+       SagaCmd "io_gdal" "2" ("GRIDS","FILE")
+       (M.fromList [
+           ]) Nothing Nothing, ".tif"))
+  ,("gdalGrid", (
+       SagaCmd "io_gdal" "0" ("FILES", "GRIDS")
+       (M.fromList [
+           ]) Nothing Nothing, ".sgrd"))
+  ,("gridXyz", (
+         SagaCmd "io_grid" "5" ("GRIDS","FILENAME")
+         (M.fromList [
+             ]) Nothing Nothing, ".xyz"))
+  ,("polyDissolve", (
+         SagaCmd "shapes_polygons" "5" ("POLYGONS","DISSOLVED")
+         (M.fromList [
+           ("method" ,("DISSOLVE" , "0")) -- 0: polygons with same attribute value
+                                         -- 1: all polygons
+                                         -- 2: polygons with same attribute value (keep inner boundaries)
+                                         -- 3: all polygons (keep inner boundaries)
+          ,("f1",("FIELD_1"  , "1"))
+          ,("f2",("FIELD_1"  , "-1"))
+          ,("f3",("FIELD_1"  , "-1"))
+         ])
+         Nothing Nothing, "_disollved.shp"))
+  ,("gridSlope", (
+         SagaCmd "ta_morphometry" "0" ("ELEVATION","SLOPE")
+         (M.fromList [
+            ("aspect" ,("ASPECT" , "aspect"))
+         ])
+         Nothing Nothing, "_slope.sgrd"))
+  ,("gridClassifyFlat", (
+         SagaCmd "grid_tools" "15" ("INPUT","RESULT")
+         (M.fromList [
+            ("method" ,("METHOD" , "2")) -- 1: range
+                                         -- 2: simple table
+           ,("table" ,("RETAB" , "reclassify.txt"))
+         ])
+         (Just (\_ _ -> writeReclassifyTableFlatSlope "reclassify.txt"))
+         (Just (\_ _ -> removeFile "reclassify.txt"))
+                , "_reclassified.sgrd"))
+  ,("gridClassToPoly", (
+         SagaCmd "shapes_grid" "6" ("GRID","POLYGONS")
+         (M.fromList [
+           ("id",    ("CLASS_ID" , "1")) -- class identifier
+          ,("all",   ("CLASS_ALL" , "0")) -- 0: one single class specified by class identifier
+                                          -- 1: all classes
+          ,("split",  ("SPLIT" , "0")) -- 0: one single (multi-)polygon object
+                                       -- 1: each island as separated polygon
+         ])
+         Nothing Nothing, "_polygons.shp"))
+  ]
+
+
+-- | Pathsway nodes with input and output commands
+sNodes :: NodeMap
+sNodes =
+  M.fromList [
+    ("las", ([], ["lasToPtCld"]))
+   ,("gdal", ([], ["gdalGrid"]))
+   ,("ptc", (["lasToPtCld"], ["ptCldToGrid"]))
+   ,("grid", (["ptCldToGrid", "xyzGridToGrid", "gdalGrid"],
+      ["gridFillGaps", "gridTifGdal", "gridPolyClip"
+      ,"gridSlope", "gridClassToPoly", "gridClassifyFlat"]))
+   ,("xyz-grid", ([], ["xyzGridToGrid"]))
+   ,("grid-filled", (["gridFillGaps"],
+      ["gridHillshade", "gridXyz", "gridContour"]))
+   ,("grid-filled-hillshade", (["gridHillshade"], ["gridTifHillshade"]))
+   ,("grid-filled-hillshade-tif", (["gridTifHillshade"], []))
+   ,("grid-hillshade", (["gridHillshade"], ["gridTifHillshade"]))
+   ,("grid-hillshade-tif", (["gridTifHillshade"], []))
+   ,("grid-filled-xyz", (["gridXyz"], []))
+   ,("grid-filled-contour", (["gridContour"], []))
+   ,("grid-polygonClip", (["gridPolyClip"], []))
+  ]
diff --git a/src/Gis/Saga/Doc.hs b/src/Gis/Saga/Doc.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Doc.hs
@@ -0,0 +1,88 @@
+{-# LANGUAGE FlexibleInstances #-}
+module Gis.Saga.Doc (renderTable, renderDot, renderNodes)
+where
+import qualified Data.Map as M
+import           Gis.Saga.Types
+import           Data.List (intercalate)
+import           Text.Printf (printf)
+
+class TableView a where renderTable :: a -> String
+
+instance TableView SagaIoCmdDB where
+  renderTable db =
+   "Command (cmdPar,sagaPar,default) sagaLib sagaModule defaultSuffix\n" ++
+    (unlines . map renderTable . M.toList $ db)
+
+instance TableView (String, SagaIoCmdExt) where
+  renderTable = renderTableSagaIoCmd
+
+renderTableSagaIoCmd :: (String, SagaIoCmdExt) -> String
+renderTableSagaIoCmd (cmdName, (cmd, ext)) =
+  let SagaCmd {sLib = lib, sMod = mod, sParas = ps } = cmd "" ""
+  in unwords [cmdName, renderTable ps, lib, mod, ext]
+
+instance TableView ParaMap where
+  renderTable pm
+                 | M.size pm == 0  = "NA"
+                 | otherwise = intercalate ":" (map renderTable . M.toList $ pm)
+
+instance TableView (String, (String,String)) where
+  renderTable (cmdArg, (sArg,def)) =
+    "(" ++ intercalate "," [cmdArg,sArg,def] ++ ")"
+
+
+
+class DotGraphics a where renderDot :: a -> String
+
+instance DotGraphics (SagaIoCmdDB,NodeMap) where
+  renderDot (cmds,chains) = unlines [
+    "digraph chains {"
+   ,"  graph  [rankdir = LR];"
+   ,"  node [shape = ellipse, fontsize = 8];"
+   ,""
+   ,unlines . map renderDot . M.toList $ cmds -- implemented modules
+   ,renderDot chains                            -- implemented chains
+   ,"}"
+   ]
+
+instance DotGraphics (String, SagaIoCmdExt) where
+  renderDot = renderDotSagaIoCmd
+
+renderDotSagaIoCmd :: (String, SagaIoCmdExt) -> String
+renderDotSagaIoCmd (cmdName, (cmd,ext)) =
+  let SagaCmd {sLib = lib, sMod = mod, sParas = ps } = cmd "" ""
+  in printf "  %s [shape = record, label = \"%s|%s|%s|%s %s\"];"
+     cmdName cmdName (renderDot ps) ext  lib mod
+
+
+renderDotParaMap :: ParaMap -> String
+renderDotParaMap pm = "{" ++ ss ++ "}"
+  where
+    ps = M.toList pm
+    cmdArgs = intercalate "\\n" (map fst ps)
+    sArgs = intercalate "\\n" (map (fst . snd)  ps)
+    defs = intercalate "\\n" (map (snd . snd)  ps)
+    ss = intercalate "|" [cmdArgs,sArgs,defs]
+
+instance DotGraphics ParaMap where
+  renderDot = renderDotParaMap
+
+instance DotGraphics NodeMap where
+  renderDot = unlines . map renderDot . M.toList
+
+instance DotGraphics (String, ([String],[String])) where
+  renderDot (name, (ins, outs)) = unlines $ map unlines [
+    map (`edge` name) ins
+   ,map (name `edge`) outs
+   ]
+
+edge :: String -> String -> String
+edge = printf "  \"%s\" -> \"%s\";"
+
+class NodeView a where renderNodes :: a -> String
+
+instance NodeView NodeMap where
+  renderNodes = unlines . map renderNodes . M.toList
+
+instance NodeView (String, ([String], [String])) where
+  renderNodes (name, (ins, outs)) = name ++ ": "++ show ins ++ show outs
diff --git a/src/Gis/Saga/LUT.hs b/src/Gis/Saga/LUT.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/LUT.hs
@@ -0,0 +1,138 @@
+module Gis.Saga.LUT (bgrColTable)
+where 
+import Data.List (zip5, intercalate)
+import Text.Printf (printf)
+
+-- | Red-blue-green-colors
+type RGB = (Int, Int, Int)
+
+-- | Create a color lookup-table based on minimum and maximum values
+bgrColTable :: Float -> Float -> String
+bgrColTable  minV maxV = hd ++ unlines (map renderRec recs')
+    where 
+        d = maxV - minV
+        s = d/fromIntegral n
+        minVs = take n [minV, (minV + s) ..]
+        maxVs = take n [(minV + s), (minV + 2*s) ..]
+        n :: Int
+        n = 100
+        nms = take n $ map (\x -> "Class " ++ show x) [1..] 
+        recs = zip5 bgr100 nms nms minVs maxVs
+        recs' = (8388864 :: Int, "Class 0", "Class 0", 0 :: Float, minV) : 
+                 recs  ++ 
+                 [(391 ::Int , "Class 101", "Class 101", maxV, 10000 :: Float)]
+        renderRec (col,nm,desc,k,j)= printf "%7i\t%s\t%s\t%10.7f\t%10.7f" 
+            col (quote nm) (quote desc) k j
+        quote s = "\"" ++ s ++ "\""
+        hd = intercalate "\t" ["COLOR","NAME","DESCRIPTION","MINIMUM", "MAXIMUM"] ++ "\n"
+        
+
+-- | Convert a RGB-color to BGR-color
+rgbToBgr ::  RGB -> Int
+rgbToBgr (r,g,b) = (b * 65536) + (g * 256) + r
+
+bgr100 :: [Int]
+bgr100 = map rgbToBgr rgb100
+
+rgb100 :: [RGB]
+rgb100 = 
+    [(000, 001, 128)
+    ,(000, 001, 135)
+    ,(000, 002, 143)
+    ,(000, 003, 151)
+    ,(000, 004, 159)
+    ,(000, 007, 167)
+    ,(000, 009, 174)
+    ,(000, 013, 182)
+    ,(000, 016, 189)
+    ,(000, 020, 196)
+    ,(000, 025, 202)
+    ,(000, 030, 208)
+    ,(000, 035, 214)
+    ,(000, 041, 220)
+    ,(000, 047, 225)
+    ,(000, 053, 230)
+    ,(000, 059, 235)
+    ,(000, 066, 239)
+    ,(000, 073, 242)
+    ,(000, 081, 246)
+    ,(000, 088, 248)
+    ,(000, 096, 251)
+    ,(000, 104, 252)
+    ,(000, 112, 253)
+    ,(000, 120, 254)
+    ,(001, 128, 255)
+    ,(001, 135, 254)
+    ,(002, 143, 253)
+    ,(003, 151, 252)
+    ,(004, 159, 251)
+    ,(007, 167, 248)
+    ,(009, 174, 246)
+    ,(013, 182, 242)
+    ,(016, 189, 239)
+    ,(020, 196, 235)
+    ,(025, 202, 230)
+    ,(030, 208, 225)
+    ,(035, 214, 220)
+    ,(041, 220, 214)
+    ,(047, 225, 208)
+    ,(053, 230, 202)
+    ,(059, 235, 196)
+    ,(066, 239, 189)
+    ,(073, 242, 182)
+    ,(081, 246, 174)
+    ,(088, 248, 167)
+    ,(096, 251, 159)
+    ,(104, 252, 151)
+    ,(112, 253, 143)
+    ,(120, 254, 135)
+    ,(128, 255, 127)
+    ,(135, 254, 120)
+    ,(143, 253, 112)
+    ,(151, 252, 104)
+    ,(159, 251, 096)
+    ,(167, 248, 088)
+    ,(174, 246, 081)
+    ,(182, 242, 073)
+    ,(189, 239, 066)
+    ,(196, 235, 059)
+    ,(202, 230, 053)
+    ,(208, 225, 047)
+    ,(214, 220, 041)
+    ,(220, 214, 035)
+    ,(225, 208, 030)
+    ,(230, 202, 025)
+    ,(235, 196, 020)
+    ,(239, 189, 016)
+    ,(242, 182, 013)
+    ,(246, 174, 009)
+    ,(248, 167, 007)
+    ,(251, 159, 004)
+    ,(252, 151, 003)
+    ,(253, 143, 002)
+    ,(254, 135, 001)
+    ,(255, 128, 001)
+    ,(254, 120, 000)
+    ,(253, 112, 000)
+    ,(252, 104, 000)
+    ,(251, 096, 000)
+    ,(248, 088, 000)
+    ,(246, 081, 000)
+    ,(242, 073, 000)
+    ,(239, 066, 000)
+    ,(235, 059, 000)
+    ,(230, 053, 000)
+    ,(225, 047, 000)
+    ,(220, 041, 000)
+    ,(214, 035, 000)
+    ,(208, 030, 000)
+    ,(202, 025, 000)
+    ,(196, 020, 000)
+    ,(189, 016, 000)
+    ,(182, 013, 000)
+    ,(174, 009, 000)
+    ,(167, 007, 000)
+    ,(159, 004, 000)
+    ,(151, 003, 000)
+    ,(143, 002, 000)
+    ,(135, 001, 000)]
diff --git a/src/Gis/Saga/Node.hs b/src/Gis/Saga/Node.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Node.hs
@@ -0,0 +1,32 @@
+module Gis.Saga.Node (getAllRoutes)
+where
+import qualified Data.Map as M
+import Gis.Saga.Types
+
+-- | find all possible edges between Nodes
+findEdges :: NodeMap -> [((String,String),[String])]
+findEdges nds =
+  [((fromNme,toNme),[o]) | (fromNme, (_, fromOuts)) <- M.toList nds
+                       , (toNme, (toIns, _)) <- M.toList nds
+                       , o <- fromOuts
+                       , i <- toIns
+                       , o == i
+                       ]
+
+
+-- | Get all possible routes for some nodes
+getAllRoutes :: NodeMap -> [((String,String),[String])]
+getAllRoutes = concat . findRoutes . findEdges
+
+-- | finds all possible routes
+findRoutes :: [((String,String),[String])] -> [[((String,String),[String])]]
+findRoutes [] = []
+findRoutes edgs = edgs : edgs' : findRoutes edgs'
+  where
+    edgs' = chainEdges edgs
+    chainEdges :: [((String,String),[String])] -> [((String,String),[String])]
+    chainEdges edges =
+      [((srcF,dstT), srcCmds ++ dstCmds) | ((srcF,srcT),srcCmds) <- edges
+                                         , ((dstF,dstT),dstCmds) <- edges
+                                         , srcT == dstF
+                                         ]
diff --git a/src/Gis/Saga/Types.hs b/src/Gis/Saga/Types.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Types.hs
@@ -0,0 +1,32 @@
+module Gis.Saga.Types where
+import qualified Data.Map as M
+
+-- | Parameters passed in with command-line
+type CmdPars = M.Map String String
+
+-- | Information needed to call saga_cmd
+data SagaCmd = SagaCmd {
+     sLib     :: String          -- ^ library to call
+    ,sMod     :: String          -- ^ module number
+    ,sInOutKey:: (String,String) -- ^ Keys to use for input and output
+    ,sParas   :: ParaMap -- ^ Parameters in addition to input and output
+    ,sPre     ::  Maybe (FilePath -> FilePath -> IO ()) -- ^ Pre-processing (input/output-file)
+    ,sPost    :: Maybe (FilePath -> FilePath -> IO ()) -- ^ Post-processing (input/output-file)
+    ,sOutFile :: FilePath          -- ^ Output-file
+    ,sInFile  :: FilePath          -- ^ Input-file
+    }
+
+-- | Parameter-Map in a 'SagaCmd'
+type ParaMap = M.Map String  (String,String)
+
+-- | Saga Command which takes only one input-, and one output-file
+type SagaIoCmd = FilePath -> FilePath -> SagaCmd
+
+-- | SagaIO-Command with output file extension
+type SagaIoCmdExt = (SagaIoCmd, String)
+
+-- | Data-base with available Saga-Input-Output-commands
+type SagaIoCmdDB = M.Map String SagaIoCmdExt
+
+-- | Node-map for form-to-combinations
+type NodeMap = M.Map String ([String],[String])
diff --git a/src/Gis/Saga/Utils.hs b/src/Gis/Saga/Utils.hs
new file mode 100644
--- /dev/null
+++ b/src/Gis/Saga/Utils.hs
@@ -0,0 +1,53 @@
+module Gis.Saga.Utils where
+import Gis.Saga.Types
+import qualified Data.Map  as M
+import System.FilePath.Posix (dropExtension, replaceExtension)
+import System.Directory (copyFile, renameFile)
+import Text.Printf (printf)
+
+defaultCmdPars :: SagaCmd -> [(String,String)]
+defaultCmdPars (SagaCmd {sParas = ps}) =
+    map (\(k,(_,v)) -> (k,v)) (M.toList ps)
+
+-- | Copy a grid data-set
+copyGrid :: FilePath -> FilePath -> IO ()
+copyGrid f t = mapM_ cp ["sgrd", "sdat", "mgrd"]
+   where
+     cp ext = copyFile (replaceExtension f ext) (replaceExtension t ext)
+
+-- | Move a grid data-set
+moveGrid :: FilePath -> FilePath -> IO ()
+moveGrid f t = mapM_ cp ["sgrd", "sdat", "mgrd"]
+   where
+     cp ext = renameFile (replaceExtension f ext) (replaceExtension t ext)
+
+-- | Utility function to append to basename of a file-name
+appendFileName :: FilePath -> String -> FilePath
+appendFileName f s = dropExtension f ++ s
+
+-- | Dispatch on field seperator
+-- dispSep :: String -> String
+-- dispSep s = case s of
+--     "space"     -> "space"
+--     "Space"     -> "space"
+--     " "         -> "space"
+--     "\t"        -> "tabulator"
+--     "tab"       -> "tabulator"
+--     "Tab"       -> "tabulator"
+--     "Tabulator" -> "tabulator"
+--     ";"         -> ";"
+--     ","         -> ","
+
+-- Render a list of string-tuple in two columns
+renderStringPairs :: [(String, String)] -> String
+renderStringPairs = concatMap renderPair
+  where
+    renderPair :: (String, String) -> String
+    renderPair (k,v) = twoCol k v
+
+-- | render two strings in two columns
+twoCol :: String -> String -> String
+twoCol = printf "\t%10s  %10s\n"
+
+writeReclassifyTableFlatSlope :: String -> IO ()
+writeReclassifyTableFlatSlope f = writeFile f "minimum\tmaximum\tnew\n0.000000\t0.100000\t1.000000\n0.100000\t0.200000\t2.000000\n0.200000\t0.500000\t3.000000\n0.500000\t1.000000\t4.000000\n1.000000\t5.000000\t5.000000\n5.000000\t25.000000\t6.000000\n25.000000\t50.000000\t7.000000\n"
diff --git a/src/sagaLut.hs b/src/sagaLut.hs
new file mode 100644
--- /dev/null
+++ b/src/sagaLut.hs
@@ -0,0 +1,16 @@
+module Main where
+import System.Environment (getArgs, getProgName)
+import Control.Monad (when)
+import Gis.Saga.LUT
+
+main :: IO ()
+main = do
+    args <- getArgs
+    prg <- getProgName
+    when (length args /= 2) (fail (usage prg))
+    let k:j:[] = args
+    putStr $ bgrColTable (read k) (read j)
+
+
+usage :: String -> String
+usage p = "Usage: " ++ p ++ " min max"
diff --git a/src/sagaPipe.hs b/src/sagaPipe.hs
new file mode 100644
--- /dev/null
+++ b/src/sagaPipe.hs
@@ -0,0 +1,89 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+module Main where
+import Control.Monad (when)
+import System.Console.CmdArgs
+import Gis.Saga.Types
+import Gis.Saga.Data
+import Gis.Saga.Utils
+import Gis.Saga.Cmd
+import Gis.Saga.Node (getAllRoutes)
+import Gis.Saga.Doc
+import Data.Text (split, pack, unpack, Text)
+import qualified Data.Map as M
+import Data.Maybe (fromJust, fromMaybe)
+import System.Environment (getArgs, withArgs)
+import System.Exit (exitSuccess)
+
+
+main :: IO ()
+main = do
+    args <- getArgs
+    -- If the user did not specify any arguments, pretend as "--help" was given
+    opts <- (if null args then withArgs ["--help"] else id) (cmdArgs defaultOpts)
+    when (modules opts) (sequence_ [putStrLn (renderTable sIoDB), exitSuccess])
+    when (dot opts) (sequence_ [putStrLn (renderDot (sIoDB,sNodes)), exitSuccess])
+    when (nodes opts) (sequence_ [putStrLn (renderNodes sNodes), exitSuccess])
+    when (null $ file opts) (error "Please specify an input-file")
+    let cmdPars = parseParamCmdString $ parameters opts
+        allChains = M.fromList . getAllRoutes $ sNodes
+        cmdChain = case chain opts of
+          "" -> lkpChain sIoDB (fromMaybe (error ("from-to-combination not supported.\n\nSupported:\n " ++
+                                                  (unlines . map show . M.toList $ allChains)))
+                                          (M.lookup (from opts, to opts) allChains))
+          _ -> lkpChain  sIoDB (splitStr ':' $ chain opts)
+    result <- doCmdChain cmdChain cmdPars (file opts) (case (output opts) of
+                                                          "" -> Nothing
+                                                          _  -> Just  (output opts)
+                                                      )
+    putStrLn ("Succussfully created " ++ result )
+
+_PROGRAM_NAME, _PROGRAM_VERSION, _PROGRAM_INFO, _PROGRAM_ABOUT, _COPYRIGHT :: String
+_PROGRAM_NAME    = "sagaPipe"
+_PROGRAM_VERSION = "0.1.0.0"
+_PROGRAM_INFO    = _PROGRAM_NAME ++ " version " ++ _PROGRAM_VERSION
+_COPYRIGHT       = "GPL licensed; written by Michel Kuhlmann 2013"
+_PROGRAM_ABOUT   = "Convert Digital Elevation Models (DEM) to diffent formats"
+
+-- | Data structure for command line options.
+data Opt = Opt
+    {
+      from       :: String
+    , to         :: String
+    , parameters :: String
+    , chain      :: String
+    , output     :: FilePath
+    , modules    :: Bool
+    , dot        :: Bool
+    , nodes      :: Bool
+    , file       :: FilePath
+    } deriving (Show, Data, Typeable)
+
+-- | Defaults for command-line options.
+defaultOpts :: Opt
+defaultOpts = Opt
+    {
+      from       = def &= help "Source-format"
+    , to         = def &= help "Target-format"
+    , parameters = def &= help "Conversion-Parameters; delimited by ':'(eg cs=0.5:sep=tabulator)"
+    , chain      = def &= help "Conversion-pathway; delimited by ':'(eg cXyzGridToGrid:cGridFillGaps)"
+    , output     = def &= help "Output-file (optional; no intermediate files preserved)"
+    , modules    = def &= help "Create a table of implemented modules"
+    , dot        = def &= help "Show implemented chains as a dot-graphics"
+    , nodes      = def &= help "Show implemented nodes"
+    , file       = def &= args &= typ "DEM-input-file"
+    } &=
+    program _PROGRAM_NAME &=
+    help _PROGRAM_ABOUT &=
+    summary (_PROGRAM_INFO ++ ", " ++ _COPYRIGHT)
+
+-- | Parse the command-line string specifying parameters
+parseParamCmdString :: String -> CmdPars
+parseParamCmdString "" = M.empty
+parseParamCmdString s = M.fromList . map parseAssign . splitStr ':' $ s
+  where
+    parseAssign :: String -> (String,String)
+    parseAssign s = let k:v:[] = splitStr '=' s in (k,v)
+
+-- | Split a String on a certain delimiter
+splitStr :: Char -> String -> [String]
+splitStr c s = map unpack $ split (== c) (pack s)
diff --git a/src/sagaTopo.hs b/src/sagaTopo.hs
new file mode 100644
--- /dev/null
+++ b/src/sagaTopo.hs
@@ -0,0 +1,97 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+-- | Program to 
+module Main where
+import           Control.Monad (when)
+import qualified Data.Map as M
+import           Gis.Saga.Cmd
+import           Gis.Saga.Data
+import           Gis.Saga.LUT
+import           Gis.Saga.Types
+import           Prelude hiding (min,max)
+import           System.Console.CmdArgs
+import           System.Environment (getArgs, withArgs)
+
+_PROGRAM_NAME, _PROGRAM_VERSION, _PROGRAM_INFO, _PROGRAM_ABOUT, _COPYRIGHT :: String
+_PROGRAM_NAME    = "sagaTopo"
+_PROGRAM_VERSION = "0.1.0.0"
+_PROGRAM_INFO    = _PROGRAM_NAME ++ " version " ++ _PROGRAM_VERSION
+_COPYRIGHT       = "GPL licensed; written by Michel Kuhlmann 2013"
+_PROGRAM_ABOUT   = "Create create topographic maps out of gridded data"
+
+_COLOR_FILE :: FilePath
+_COLOR_FILE = "relief-colors.txt"
+
+main :: IO ()
+main = do
+    cArgs <- getArgs
+    -- If the user did not specify any arguments, pretend as "--help" was given
+    opts <- (if null cArgs then withArgs ["--help"] else id) (cmdArgs defaultOpts)
+    when (output opts == "") (fail "Please specify an output-tif")
+    r <- case (hillshade opts, min opts, max opts) of
+      (True, 0.0, 0.0)  -> sgrdToTopo (file opts) (output opts) Nothing Nothing
+      (False, 0.0, 0.0) -> sgrdToRelief (file opts) (output opts) Nothing Nothing
+      (True, _, _)      -> sgrdToTopo (file opts) (output opts) (Just $ min opts) (Just $ max opts)
+      (False, _, _)     -> sgrdToRelief (file opts) (output opts) (Just $ min opts) (Just $ max opts)
+    putStrLn ("Successfully created " ++ r)
+
+-- | Convert a grid-file into a topo graphic map
+sgrdToTopo :: FilePath -> FilePath -> Maybe Float -> Maybe Float -> IO FilePath
+sgrdToTopo fIn fOut Nothing Nothing = do
+  let hsF = "temp_hillshade.sgrd"
+  doSaga $ gridHillShade hsF fIn
+  doSaga $ SagaCmd "libio_grid_image" "0" ("GRID", "FILE")
+          (M.fromList [
+              ("a",("SHADE", hsF))
+              ])
+          Nothing Nothing fOut fIn
+
+sgrdToTopo fIn fOut (Just min') (Just max') = do
+  let hsF = "temp_hillshade.sgrd"
+  doSaga $ gridHillShade hsF fIn
+  writeFile _COLOR_FILE (bgrColTable min' max') -- color-lookup-table
+  doSaga $ SagaCmd "libio_grid_image" "0" ("GRID", "FILE")
+          (M.fromList [
+              ("a",("SHADE", hsF))
+             ,("b", ("LUT", _COLOR_FILE))
+              ])
+          Nothing Nothing fOut fIn
+
+sgrdToRelief :: FilePath -> FilePath -> Maybe Float -> Maybe Float -> IO FilePath
+sgrdToRelief fIn fOut Nothing Nothing = do
+  doSaga $ SagaCmd "libio_grid_image" "0" ("GRID", "FILE")
+          (M.fromList [])
+          Nothing Nothing fOut fIn
+
+sgrdToRelief fIn fOut (Just min') (Just max') = do
+  writeFile _COLOR_FILE (bgrColTable min' max') -- color-lookup-table
+  doSaga $ SagaCmd "libio_grid_image" "0" ("GRID", "FILE")
+          (M.fromList [
+             ("b", ("LUT", _COLOR_FILE))
+             ])
+          Nothing Nothing fOut fIn
+
+-- | Data structure for command line options.
+data Opt = Opt
+    {min    :: Float
+    ,max    :: Float
+    ,output :: FilePath
+    ,hillshade :: Bool
+    ,file   :: FilePath
+    } deriving (Show, Data, Typeable)
+
+-- | Defaults for command-line options.
+defaultOpts :: Opt
+defaultOpts = Opt
+    {output = def &= typ "TIF" &= help "output-tif"
+    ,min    = def &= help "minimum elevation-value (optional)"
+    ,max    = def &= help "maximum elevation-value (optional)"
+    ,hillshade = def &= help "Should a hillshade be included"
+    ,file   = def &= args &= typ "DEM-file.sgrd"
+    } &=
+    program _PROGRAM_NAME &=
+    help _PROGRAM_ABOUT &=
+    summary (_PROGRAM_INFO ++ ", " ++ _COPYRIGHT)
+
+gridHillShade :: SagaIoCmd
+gridHillShade = fst $ lkpCmd "gridHillshade" sIoDB
+
