diff --git a/kmz2tiff.py b/kmz2tiff.py
new file mode 100644
index 0000000..6109e13
--- /dev/null
+++ b/kmz2tiff.py
@@ -0,0 +1,237 @@
+"""
+kmz2tiff.py
+   -- merge high resoulition images in kmls to one geotiff
+"""
+
+# Version: ImageMagick 6.9.10-23 Ubuntu 20.04
+
+import sys,os,string,glob,math
+import shutil
+import xml.etree.ElementTree as ET
+from PIL import Image
+
+def cleanStrings(inStr, leftstr,rightstr):
+  a = inStr.find(leftstr)
+  b = inStr.find(rightstr)
+
+  if a < 0 and b < 0:
+    return False
+
+  return inStr[a + len(leftstr):b]
+  
+def getimagesize(image_file):
+    """ return image size """
+    
+    img = Image.open(image_file)
+    width,height = img.size
+    
+    return [width, height]
+    
+        
+def extractbbox(kml):
+    """ find boundingbox from a kml """
+    
+    with open(kml,"r") as f:
+        kmlstring = f.read()
+    f.closed
+    
+    #<north>32.93182878</north>
+    #<south>32.87493534</south>
+    #<east>-116.0291427</east>
+    #<west>-116.08603614</west>
+    
+    north = cleanStrings(kmlstring, "<north>","</north>")
+    south = cleanStrings(kmlstring, "<south>","</south>")
+    east  = cleanStrings(kmlstring, "<east>","</east>")
+    west  = cleanStrings(kmlstring, "<west>","</west>")
+    
+    bbox = map(float,[west,east,north,south])
+    return bbox
+
+def generateworldfile(image_file,bbox,imagesize):
+    """ write the world file """
+    
+    # reference: http://en.wikipedia.org/wiki/World_file
+    # Line 1: A: pixel size in the x-direction in map units/pixel
+    # Line 2: D: rotation about y-axis
+    # Line 3: B: rotation about x-axis
+    # Line 4: E: pixel size in the y-direction in map units, almost always negative[3]
+    # Line 5: C: x-coordinate of the center of the upper left pixel
+    # Line 6: F: y-coordinate of the center of the upper left pixel
+    
+    # no rotation in our case
+    world_file = image_file[:-4] + ".pgw"
+    
+    [west,east,north,south] = bbox
+    [width, height] = imagesize
+    with open(world_file,'w') as f:
+        
+        xsize = (east - west) / width
+        ysize = (south - north) / height
+        xul = west
+        yul = north
+        
+        f.write("%.8f" % xsize + "\n")
+        f.write("0.0" + "\n")
+        f.write("0.0" + "\n")
+        f.write("%.8f" % ysize + "\n")
+        f.write("%.8f" % xul + "\n")
+        f.write("%.8f" % yul + "\n")
+    
+    return
+    
+def getint(name):
+    """ sort kml by int """
+    
+    basename = string.split(name,os.path.sep)[-1][:-4]
+    alpha, num = basename.split("-")
+    return int(num)
+
+def parse_kml(dockml):
+    """ parse doc.kml """
+
+    bboxlist=[]
+    tree = ET.parse(dockml)
+    for groundoverlay in tree.iter(tag="{http://www.opengis.net/kml/2.2}GroundOverlay"):
+        V = {}
+        for elem in groundoverlay:
+            if "name" in elem.tag:
+                V['name'] = elem.text
+                continue
+            if "LatLonBox" in elem.tag:
+                for latlon_elem in elem:
+                    pos_tag = latlon_elem.tag.replace('{http://www.opengis.net/kml/2.2}','')
+                    V[pos_tag]=float(latlon_elem.text)
+        if "tile" in V['name']:
+            bboxlist.append(V)
+    return bboxlist
+
+def processing_kml(kmlfolder, outputfolder):
+    """ processing kml folder """
+    
+    # older version
+    newversion = True
+    geotiff = os.path.basename(kmlfolder)+".tiff"
+    geotiff_compressed = os.path.basename(kmlfolder)+"_compressed.tiff"
+
+
+    kmls = glob.glob(kmlfolder + os.path.sep + "tile-*.kml")
+    if not len(kmls) == 0:
+        newversion = False
+        # sort by number from 0 ~ xxx
+        kmls.sort(key=getint)
+    
+        #cmd = "gdal_merge.py -o /tmp/uid10_int.tif"
+        cmd = "montage"
+        # need to find out west most tile
+        # need to find out east most tile
+        bboxlist = []
+        totalwidth, totalheight = 0, 0
+        for kml in kmls:
+            #print kml
+            tile = string.split(kml, os.path.sep)[-1][:-4]
+            bbox = extractbbox(kml)
+            bboxlist.append(bbox)
+            image = kmlfolder + os.path.sep + "images" + os.path.sep + tile + ".png"
+            imagesize = getimagesize(image)
+            totalwidth += imagesize[0]
+            totalheight += imagesize[1]
+            #generateworldfile(image, bbox, imagesize)     
+            cmd += " " + tile + ".png"
+    #os.chdir(kmlfolder + os.path.sep + "images")
+    # new version
+    if newversion:
+        totalwidth, totalheight = 0, 0
+        cmd = "montage"
+        dockml = kmlfolder + os.path.sep + "doc.kml"
+        bbox_dict = parse_kml(dockml)
+        #[west,east,north,south]
+        for item in bbox_dict:
+            image = kmlfolder + os.path.sep + "images" + os.path.sep + item['name']
+            imagesize = getimagesize(image)
+            totalwidth += imagesize[0]
+            totalheight += imagesize[1]
+            #generateworldfile(image, bbox, imagesize)     
+            cmd += " " + item['name']
+        bboxlist = []
+        bboxlist.append([bbox_dict[0]['west'],bbox_dict[0]['east'],bbox_dict[0]['north'],bbox_dict[0]['south']])
+        bboxlist.append([bbox_dict[-1]['west'],bbox_dict[-1]['east'],bbox_dict[-1]['north'],bbox_dict[-1]['south']])
+ 
+
+    uppercorner = bboxlist[0]
+    lowercorner = bboxlist[-1]
+    lonspan = lowercorner[1]-uppercorner[0]
+    latspan = lowercorner[3]-uppercorner[2]
+    #[west,east,north,south]
+    bbox = [uppercorner[0],lowercorner[1],uppercorner[2],lowercorner[3]]
+    row = int(math.ceil(lonspan / (uppercorner[1]-uppercorner[0])))
+    col = int(math.ceil(latspan / (uppercorner[3]-uppercorner[2])))
+    print(row,col)
+    realwidth, realheight = totalwidth/col, totalheight/row
+    totalimage = kmlfolder + os.path.sep + "images" + os.path.sep + "alltest.png"
+    generateworldfile(totalimage, bbox, [realwidth,realheight]) 
+    
+    #gdalfunction -srcnodata 0
+    #gdal_translate -a_nodata 0 -b 1 -b 2 -b 3 -mask 4 alltest.png alltest.tiff -a_srs EPSG:4326
+    #gdal_translate -a_nodata 0 alltest.tiff -co COMPRESS=DEFLATE -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 alltest_compress.tiff
+    #gdaladdo -r average alltest_compress.tiff 2 4 8 16 32
+    # change folder to images folder
+    os.chdir(kmlfolder + os.path.sep + "images")
+    cmd += " -tile "+str(row)+"x" + str(col) +" -geometry +0+0 -depth 8 -background none PNG32:alltest.png"
+    print("mosaic image ...")
+    os.system(cmd)
+    
+    print("gdal_translate image ...")
+    #gdal_translate -a_nodata 0 -b 1 -b 2 -b 3 -mask 4 alltest.png alltest.tiff -a_srs EPSG:4326
+    cmd = "gdal_translate alltest.png "+ geotiff + " -a_srs EPSG:4326"
+    os.system(cmd)
+    #gdal_translate -a_nodata 0 alltest.tiff -co COMPRESS=DEFLATE -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 alltest_compress.tiff
+    cmd = "gdal_translate " + geotiff + " -co COMPRESS=DEFLATE -co TILED=YES -co BLOCKXSIZE=512 -co BLOCKYSIZE=512 "+ geotiff_compressed
+    os.system(cmd)
+    #gdaladdo -r average alltest_compress.tiff 2 4 8 16 32
+    cmd = "gdaladdo -r average "+ geotiff_compressed + " 2 4 8 16 32 64"
+    os.system(cmd)
+    print ("done !")
+
+    # move all tiff file
+    #cmd = "mv *.tiff " + outputfolder
+    #print "moved tiffs"
+    # only move compressed tiff
+    cmd = "mv " + geotiff_compressed + " " + outputfolder
+    print("moved compressed tiff")
+    os.system(cmd)
+
+    return
+
+def convert_kmz(kmz,outputfolder):
+    """ convert kmz to tiff """
+
+    # first unzip kmz file
+    # uzip kmz -d dir
+    kmzfolder = kmz[:-4] 
+    cmd = "unzip " + kmz + " -d " + kmzfolder
+    #print cmd
+    os.system(cmd)
+    processing_kml(kmzfolder,outputfolder)
+
+    # chdir then delete folder
+    os.chdir(os.path.dirname(os.path.abspath(__file__)))
+    # remove kmz folder
+    try:
+        shutil.rmtree(kmzfolder)
+    except OSError as e:
+        print("Error: %s - %s." % (e.filename, e.strerror))
+
+    return
+
+def main():
+
+    kmzs = ["uid1540@SanAnd_08503_12023-008_13095-013_0387d_s01_L090HH_01.unw.kmz",
+        "uid1541@SanAnd_08503_12130-002_13095-013_0196d_s01_L090HH_01.unw.kmz"]
+    outputfolder = "/home/cicuser/Downloads/coding"
+    for kmz in kmzs:
+        convert_kmz(kmz,outputfolder)
+
+
+if __name__ == "__main__":
+    main()