Initial commit

.gitignore

+*.pyc

formats/__init__.py

+from .asciigrid import AsciiGrid;
+from .floatingpointraster import FloatingPointRaster;
+from .gridenvelope2d import GridEnvelope2D;
+from .netcdf4envelope2d import Netcdf4Envelope2D;
+from .hdf5raster import Hdf5Raster;
+from .netcdf4raster import Netcdf4Raster;
\ No newline at end of file

formats/asciigrid.py

+import const;
+import os.path;
+import array;
+from raster import Raster
+from .gridenvelope2d import GridEnvelope2D;
+
+class AsciiGrid(GridEnvelope2D, Raster):
+    "A raster represented by an ASCII file, with extension 'asc'"
+    
+    # Constants
+    const.FILEXT = "asc";     
+    const.MAXDIGITSPERCELL = 11;
+    
+    # Data attributes - assign some dummy values for the mean time
+    name = "dummy." + const.FILEXT;
+    folder = os.getcwd();
+    """
+    ncols = 1;
+    nrows = 1;
+    xll = 0.0;
+    yll = 0.0;
+    """
+    cellsize = 100.0;
+    nodatavalue = -9999.0;
+    datatype = const.FLOAT;
+    dataformat='f'
+    
+    # Private attributes
+    datafile = None;
+    currow = 0;
+    __mode = 'r';
+    __digitspercell = 7;
+    
+    def __init__(self, filepath, *datatype):
+        # Initialise
+        DATAFILEXT = const.FILEXT
+        HEADEREXT = ""
+        # Retrieve the name from the filepath and assign - incl. extension
+        self.name = os.path.basename(filepath);
+        # Also derive the folder
+        self.folder = os.path.dirname(filepath);
+        # Finally set the datatype
+        if len(datatype) > 0:
+            if (datatype[0] == const.INTEGER): 
+                self.datatype = const.INTEGER;
+                self.dataformat = 'i'
+            else: 
+                self.datatype = const.FLOAT;
+                
+    def open(self, mode, ncols=1, nrows=1, xll=0.0, yll=0.0, cellsize=100.0, nodatavalue=-9999.0):
+        # Initialise
+        super(AsciiGrid, self).open(mode); 
+               
+        # If file does not exist and mode[0] = 'w', create it!
+        if (mode[0] == 'w') and (not os.path.exists(self.folder + os.path.sep + self.name)):
+            self.datafile = file(self.folder + os.path.sep + self.name, 'w');
+            self.__mode = mode;
+            GridEnvelope2D.__init__(self, ncols, nrows, xll, yll, cellsize, cellsize);
+            self.cellsize = cellsize;
+            self.nodatavalue = nodatavalue;
+            self.writeheader();
+            return True;
+        else:    
+            # Open the file
+            if os.path.exists(self.folder + os.path.sep + self.name):            
+                self.datafile = open(self.folder + os.path.sep + self.name, mode[0]); 
+                if (mode[0] == 'w'):
+                    # Assign the data attributes 
+                    self.ncols = ncols;
+                    self.nrows = nrows;                    
+                    self.xll = xll;
+                    self.yll = yll;
+                    self.cellsize = cellsize;
+                    self.nodatavalue = nodatavalue;
+                    self.writeheader();
+                else: 
+                    # File is open - retrieve the data attributes from the header of the file
+                    self.readheader();
+                    
+                    # Also find out how many digits per cell were used - assume it's constant
+                    pos = self.datafile.tell();
+                    line = self.datafile.readline();
+                    self.__digitspercell = ((1 + len(line)) / self.ncols) - 1;
+                    self.datafile.seek(pos);  # return to first line with data
+                    GridEnvelope2D.__init__(self, self.ncols, self.nrows, self.xll, self.yll, self.cellsize, self.cellsize);
+                return True;
+            else: return False;
+            
+    def readheader(self):
+        # Assume that the file is open; read header of the file and assign all attributes 
+        if (self.datafile != None):
+            if (not self.datafile.closed):            
+                hl = self.datafile.readline();
+                self.ncols = int(hl.replace('ncols', ''));
+                hl = self.datafile.readline();
+                self.nrows = int(hl.replace('nrows', ''));
+                hl = self.datafile.readline();
+                self.xll = float(hl.replace('xllcorner', ''));        
+                hl = self.datafile.readline();
+                self.yll = float(hl.replace('yllcorner', ''));        
+                hl = self.datafile.readline();
+                self.cellsize = float(hl.replace('cellsize', ''));        
+                hl = self.datafile.readline();
+                if (self.datatype == const.INTEGER): 
+                    self.nodatavalue = int(hl.replace('NODATA_value', ''));
+                else: 
+                    self.nodatavalue = float(hl.replace('NODATA_value', ''));
+            else: 
+                msg = "File " + self.name + " not found in folder " + self.folder;
+                raise IOError(msg);                
+    
+    def next(self, parseLine=True):
+        # Read the next row if possible, otherwise generate StopIteration
+        # Assume that the header lines have been read and are correct wrt. ncols and nrows
+        result = None;
+        try:
+            if (self.datafile != None):
+                if (not self.datafile.closed):
+                    self.currow += 1;
+                    if (self.currow > self.nrows): 
+                        raise StopIteration("Attempt to move beyond last row.");
+                    
+                    # Allocate a new array with ncols of the right type
+                    if (self.datatype == const.INTEGER):
+                        result = array.array('l', self.ncols * [self.nodatavalue]);
+                    else:
+                        result = array.array('f', self.ncols * [self.nodatavalue]);
+
+                    # Now fill the array - first translate whitespace into space
+                    rawline = self.datafile.readline();
+                    if parseLine:
+                        i = 0;                    
+                        for x in rawline.split(): 
+                            if (i < self.ncols):
+                                if (self.datatype == const.INTEGER):
+                                    result[i] = int(x);
+                                else:
+                                    result[i] = float(x);
+                            i = i + 1;
+                    return result;
+                else: raise StopIteration("Attempt to read raster data from a closed file.");
+            else: raise StopIteration("Attempt to read raster data from an unassigned file.")
+        except Exception, e:
+            print "Error: " + str(e);
+            raise StopIteration;
+    
+    """       
+    def hasSameExtent(self, obj):
+        if not isinstance(obj, AsciiGrid):
+            return False;
+        if self.ncols != obj.ncols:
+            return False;
+        if self.nrows != obj.nrows:
+            return False;
+        if abs(self.cellsize - obj.cellsize) > const.epsilon:
+            return False;
+        if abs(self.xll - obj.xll) > const.epsilon:
+            return False;
+        if abs(self.yll - obj.yll) > const.epsilon:
+            return False;
+        else:
+            return True;
+    """
+           
+    @staticmethod
+    def getFileExt():
+        return const.FILEXT;
+        
+    def writeheader(self):
+        # Assume that the file is open; write header of the file with all attributes 
+        if (self.datafile != None):
+            if (not self.datafile.closed):
+                try:
+                    self.datafile.write("ncols         " + str(self.ncols).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                    self.datafile.write("nrows         " + str(self.nrows).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                    self.datafile.write("xllcorner     " + str(self.xll).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                    self.datafile.write("yllcorner     " + str(self.yll).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                    self.datafile.write("cellsize      " + str(self.cellsize).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                    self.datafile.write("NODATA_value  " + str(self.nodatavalue).rjust(const.MAXDIGITSPERCELL + 1) + "\n");
+                except Exception, e:
+                    print e;
+                    msg = "Header lines could not be written to file " + self.name + " in folder " + self.folder;
+                    raise IOError(msg);
+        
+    def writenext(self, sequence_with_data):
+        # Write the next line if possible, otherwise generate StopIteration
+        # We assume that exactly 1 row is included.
+        try:          
+            if (self.datatype == const.INTEGER):
+                for k in range(0, self.ncols):
+                    s = str(sequence_with_data[k]).rjust(const.MAXDIGITSPERCELL + 1);
+                    self.datafile.write(s);  
+            else:
+                totalwidth = const.MAXDIGITSPERCELL - 1
+                fmtstr = "{:" + str(totalwidth) + ".2f}"
+                for k in range(0, self.ncols):
+                    s = fmtstr.format(sequence_with_data[k]).rjust(const.MAXDIGITSPERCELL + 1);
+                    self.datafile.write(s);                 
+            return self.datafile.write("\n");
+        except Exception, e:
+            print e;            
+            raise StopIteration
+    
+    def flush(self):
+        self.datafile.flush();
+                
+    def reset(self):
+        self.datafile.seek(0);
+        if (self.__mode[0] == 'r'):
+            self.readheader();
+        super(AsciiGrid, self).reset() 
+        
\ No newline at end of file

formats/bandraster.py

+# Copyright (c) 2004-2015 Alterra, Wageningen-UR
+# Steven Hoek (steven.hoek@wur.nl), June 2015
+from raster import Raster
+from gridenvelope2d import GridEnvelope2D
+import os.path
+from math import fabs
+
+# Abstract class
+class BandRaster(GridEnvelope2D, Raster):
+    # Constants
+    INTEL = 'I'; # Least significant byte first
+    UNSIGNEDINT = 'UNSIGNEDINT'
+    
+    # Data attributes
+    nbands = 3 #default
+    nbits = 8  #default
+    nodatavalue = 256; #default
+    dataformat = "h" # Default data format (2-byte signed short int)
+
+    def __init__(self, filepath, *dataformat):
+        Raster.__init__(self, filepath)
+        # Retrieve the name from the filepath and assign - incl. extension
+        self.name = os.path.basename(filepath);
+        # Also derive the folder
+        self.folder = os.path.dirname(filepath);
+        # Finally set the dataformat
+        # TODO: get this from the header file?
+        if len(dataformat) > 0:
+            self.dataformat = dataformat[0]
+    
+    def open(self, mode, ncols=1, nrows=1, nbands=1, xll=0.0, yll=0.0, cellsize=1.0, nodatavalue=-9999.0):
+        super(BandRaster, self).open(mode);
+        # If file does not exist and mode[0] = 'w', create it!
+        if (mode[0] == 'w'):
+            # Set data attributes and write header file anyhow
+            self.nbands = nbands;
+            self.cellsize = cellsize
+            self.nodatavalue = nodatavalue
+            self.envelope = GridEnvelope2D.__init__(self, ncols, nrows, xll, yll, cellsize, cellsize)
+            self.writeheader()
+            if (not os.path.exists(self.folder + os.path.sep + self.name)):
+                self.datafile = file(self.folder + os.path.sep + self.name, 'w') # File does not exist
+            else:
+                self.datafile = open(self.folder + os.path.sep + self.name, mode[0] + 'b') # File exists
+            return True
+        else:    
+            # Open the file
+            if os.path.exists(os.path.join(self.folder, self.name)):            
+                # Open the file and retrieve the data attributes from the header file
+                self.datafile = open(self.folder + os.path.sep + self.name, mode[0] + 'b'); 
+                self.readheader();
+                self.xll = self.xul;
+                if self.ycoords_sort == 'DESC':
+                    self.yll = self.yul - self.nrows * self.dy;
+                else:
+                    self.yll = self.yul + self.nrows * self.dy;
+                self.envelope = GridEnvelope2D.__init__(self, self.ncols, self.nrows, self.xll, self.yll, self.dx, self.dy)
+                return True
+            else: return False
+            
+    def readheader(self):
+        # See if we can find the header file to use. Then read it and assign all attributes
+        hdrFilename = ""
+        if os.path.isfile(os.path.join(self.folder, self.name + "." + self.HEADEREXT)): #@UndefinedVariable
+            hdrFilename = os.path.join(self.folder, self.name + "." + self.HEADEREXT) #@UndefinedVariable
+        else:
+            name_wo_ext = os.path.splitext(os.path.join(self.folder, self.name))[0]
+            if os.path.isfile(name_wo_ext + "." + self.HEADEREXT ): #@UndefinedVariable
+                hdrFilename = os.path.join(name_wo_ext + "." + self.HEADEREXT) #@UndefinedVariable
+        if hdrFilename == "":
+            raise ValueError("Not sure about name of header file: " + hdrFilename + "?");
+        hdrFilename = os.path.normpath(hdrFilename)
+        if not os.path.exists(hdrFilename):  
+            raise ValueError("Header file not found: " + hdrFilename);
+        hf = open(hdrFilename, 'r');     
+        if (hf != None):           
+            hl = hf.readline();
+            self.byteorder = str(hl.replace('BYTEORDER', '').strip()); 
+            if self.byteorder != self.INTEL:
+                raise ValueError("Unsupported byte order")
+            hl = hf.readline();
+            layout = str(hl.replace('LAYOUT', '').strip());
+            extuc = self.DATAFILEXT.upper() 
+            if layout != extuc:
+                raise ValueError("Incorrect layout in header - apparently not a " + extuc + " file");
+            hl = hf.readline();
+            self.nrows = int(hl.replace('NROWS', ''));
+            hl = hf.readline();
+            self.ncols = int(hl.replace('NCOLS', ''));                
+            hl = hf.readline();
+            self.nbands = int(hl.replace('NBANDS', ''));
+            hl = hf.readline();
+            self.nbits = int(hl.replace('NBITS', ''));
+            hl = hf.readline();
+            bandrowbytes = int(hl.replace('BANDROWBYTES', ''));
+            if self.nbits * self.ncols / 8 != bandrowbytes:
+                raise ValueError("Incorrect number of bytes per band row in header");
+            hl = hf.readline();
+            totalrowbytes = int(hl.replace('TOTALROWBYTES', ''));
+            if self.nbands * bandrowbytes != totalrowbytes:
+                raise ValueError("Incorrect total bytes per row in header");
+            hl = hf.readline();
+            if hl.find('PIXELTYPE') != -1:
+                # Assume ESRI style header
+                self.pixeltype = str(hl.replace('PIXELTYPE', '').strip());
+                hl = hf.readline();
+                ulxmap = float(hl.replace('ULXMAP', ''));         
+                hl = hf.readline();
+                ulymap = float(hl.replace('ULYMAP', ''));        
+                hl = hf.readline();
+                self.dx = float(hl.replace('XDIM', ''));        
+                hl = hf.readline();
+                self.dy = float(hl.replace('YDIM', ''));  
+                
+                # ulxmap - The x-axis map coordinate of the center of the upper left pixel
+                # ulymap - The y-axis map coordinate of the center of the upper left pixel
+                self.xul = ulxmap - 0.5*self.dx
+                self.yul = ulymap + 0.5*self.dy 
+                hl = hf.readline();
+                self.nodatavalue = int(hl.replace('NODATA', ''));
+                hf.close()
+            else:
+                # Assume that the rest of the information has to be read from a world file
+                name_wo_ext = os.path.splitext(os.path.join(self.folder, self.name))[0]
+                if os.path.isfile(name_wo_ext + "." + self.WORLDEXT):
+                    # TODO: Adapt the following so that it accounts also for rotated mapsheets
+                    sign = lambda x: (1, -1)[x<0];
+                    hdrFilename = os.path.normpath(os.path.join(name_wo_ext + "." + self.WORLDEXT))
+                    hf = open(hdrFilename, 'r')
+                    hl = hf.readline();
+                    self.dx = float(hl.strip());
+                    hl = hf.readline();
+                    self.roty = float(hl.strip());
+                    hl = hf.readline();
+                    self.rotx = float(hl.strip());
+                    eps = 0.0001;
+                    if abs(self.rotx)>eps or abs(self.roty)>eps:
+                        raise NotImplementedError("Cannot handle rotated mapsheets yet!")
+                    hl = hf.readline();            
+                    self.dy = fabs(float(hl.strip()));
+                    if sign(float(hl.strip())) == 1.0: self.ycoords_sort = 'ASC';
+                    hl = hf.readline();
+                    self.xul = float(hl.strip()) - 0.5 * self.dx;
+                    hl = hf.readline();
+                    self.yul = float(hl.strip()) + 0.5 * self.dy;
+                    hf.close();
+            self.cellsize = (self.dx + self.dy) / 2
+        else: 
+            msg = "Unable to open header file " + hdrFilename + " in folder " + self.folder;
+            raise IOError(msg);
+
+    def writeheader(self):
+        # TODO: test!
+        # Write header file with all attributes
+        hdrFilename = os.path.join(self.folder, self.name + "." + self.HEADEREXT) #@UndefinedVariable
+        hdrFilename = os.path.normpath(hdrFilename)
+        try:
+            # Open the file if it exists, otherwise create it
+            if os.path.exists(hdrFilename):
+                hf = open(hdrFilename, 'w');
+            else:
+                hf = file(hdrFilename, 'w');
+
+            # Now write all the attributes
+            hf.write("BYTEORDER     " + str(self.byteorder) + "\n")
+            hf.write("LAYOUT        " + self.DATAFILEXT.upper() + "\n")
+            hf.write("NROWS         " + str(self.nrows) + "\n")
+            hf.write("NCOLS         " + str(self.ncols) + "\n")
+            hf.write("NBANDS        " + str(self.nbands) + "\n")
+            hf.write("NBITS         " + str(self.nbits) + "\n") 
+            bandrowbytes = self.nbits * self.ncols / 8
+            hf.write("BANDROWBYTES  " + str(bandrowbytes) + "\n")
+            hf.write("TOTALROWBYTES " + str(self.nbands * bandrowbytes) + "\n")
+            if self.dataformat.lower() == 'i':
+                if self.dataformat.isupper(): hf.write("PIXELTYPE     UNSIGNEDINT\n") 
+                else: hf.write("PIXELTYPE     SIGNEDINT\n")
+            else: hf.write("PIXELTYPE     FLOAT\n")
+                
+            # ulxmap - The x-axis map coordinate of the center of the upper left pixel
+            ulxmap = self.xll + 0.5*self.dx
+            hf.write("ULXMAP        " + str(ulxmap) + "\n");
+            # ulymap - The y-axis map coordinate of the center of the upper left pixel
+            ulymap = self.yll + self.nrows*self.dy - 0.5*self.dy # Check this!!!
+            hf.write("ULYMAP        " + str(ulymap) + "\n");
+            hf.write("XDIM          " + str(self.dx) + "\n");
+            hf.write("YDIM          " + str(self.dy) + "\n");
+            hf.write("NODATA  " + str(self.nodatavalue) + "\n");
+        except Exception, e:
+            msg = "Header file " + hdrFilename + " could not be written in folder " + self.folder;
+            raise IOError(msg + "(" + str(e) + ")");
+        
+    def _is_sequence(self, arg):
+        return (not hasattr(arg, "strip") and hasattr(arg, "__getitem__") or hasattr(arg, "__iter__"))
+    
+    def next(self, parseLine=True):
+        pass
+
+    def writenext(self, sequence_with_data):
+        # input is sequence type - e.g. list, array.array or numpy.array
+        pass
+    
+    @staticmethod
+    def getDataFileExt(self):
+        return self.DATAFILEXT;
+    
+    @staticmethod
+    def getHeaderFileExt():
+        return self.HEADEREXT 
+    
+    def close(self):
+        if self.datafile:
+            if not self.datafile.closed:
+                self.datafile.close(); 
+
+    def reset(self):
+        self.currow = 0; 
+        self.datafile.seek(0);
+        
+    def __exit__(self, exception_type, exception_value, traceback):
+        self.close()
+        
+    def __enter__(self):
+        return self
+    
\ No newline at end of file

formats/basetiffraster.py

+from raster import Raster
+import os
+from libtiff.libtiff_ctypes import TIFFFieldInfo, TIFFDataType, FIELD_CUSTOM, add_tags
+
+class BaseTiffRaster(Raster):
+    # Constants
+    DATAFILEXT = "tif";
+    HEADEREXT = "tfw"; # WORLD_EXT?
+    __BYTESPERCELL = 4;
+
+    # Data attributes - assign some dummy values for the mean time
+    name = "dummy.tif";
+    folder = os.getcwd();
+    nodatavalue = -9999.0;
+    byteorder = 'II'; # Little endian
+    roty = 0.0;
+    rotx = 0.0;
+    pageNumber = [0, 1]
+    modelPixelScale = [0.0, 0.0, 0.0]
+    modelTiepoint = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+    ModelTransformation = 16 * [0.0]
+    GeoKeyDirectory = 32 * [0]
+    GeoDoubleParams = 1.0e-317
+    GeoAsciiParams = "GCS_WGS_1984|"
+    GdalMetadata = '<GDALMetadata>\n  <Item name="RepresentationType" sample="0">ATHEMATIC</Item>\n</GDALMetadata>'
+        
+    def __init__(self, filepath, *datatype):
+        pass
+    
+    def open(self, mode, ncols=1, nrows=1, xll=0.0, yll=0.0, cellsize=1.0, nodatavalue=-9999.0):
+        super(BaseTiffRaster, self).open(mode)
+        extra_tags = [
+            TIFFFieldInfo(297, 2, 2, TIFFDataType.TIFF_SHORT, FIELD_CUSTOM, True, False, "PageNumber"),          
+            TIFFFieldInfo(33550, 3, 3, TIFFDataType.TIFF_DOUBLE, FIELD_CUSTOM, True, False, "ModelPixelScaleTag"),
+            TIFFFieldInfo(33922, 6, 6, TIFFDataType.TIFF_DOUBLE, FIELD_CUSTOM, True, False, "ModelTiepointTag"),
+            TIFFFieldInfo(34264, 16, 16, TIFFDataType.TIFF_DOUBLE, FIELD_CUSTOM, True, False, "ModelTransformationTag"),
+            TIFFFieldInfo(34735, 32, 32, TIFFDataType.TIFF_SHORT, FIELD_CUSTOM, True, False, "GeoKeyDirectoryTag"),
+            TIFFFieldInfo(34736, -1, -1, TIFFDataType.TIFF_DOUBLE, FIELD_CUSTOM, True, False, "GeoDoubleParamsTag"),
+            TIFFFieldInfo(34737, -1, -1, TIFFDataType.TIFF_ASCII, FIELD_CUSTOM, True, False, "GeoAsciiParamsTag"),
+            TIFFFieldInfo(42112, -1, -1, TIFFDataType.TIFF_ASCII, FIELD_CUSTOM, True, False, "GDAL_METADATA"),
+            TIFFFieldInfo(42113, -1, -1, TIFFDataType.TIFF_ASCII, FIELD_CUSTOM, True, False, "GDAL_NODATA")
+        ]
+        add_tags(extra_tags)
+        
+    def set_extra_tags(self):
+        # The following is in view of the georeferencing
+        self.datafile.SetField("PageNumber", self.pageNumber)
+        self.datafile.SetField("ModelPixelScaleTag", self.modelPixelScale) 
+        self.datafile.SetField("ModelTiepointTag", self.modelTiepoint)
+        self.datafile.SetField("ModelTransformationTag", self.ModelTransformation)
+        self.datafile.SetField("GeoKeyDirectoryTag", self.GeoKeyDirectory)
+        #self.datafile.SetField("GeoDoubleParamsTag", self.GeoDoubleParams)
+        self.datafile.SetField("GeoAsciiParamsTag", str(self.GeoAsciiParams))
+        self.datafile.SetField("GDAL_METADATA", str(self.GdalMetadata))
+        
+    def get_extra_tags(self):        
+        # The following is in view of the georeferencing  
+        self.pageNumber = self.datafile.GetField("PageNumber")   
+        self.modelPixelScale = self.datafile.GetField("ModelPixelScaleTag")
+        self.modelTiepoint = self.datafile.GetField("ModelTiepointTag")
+        self.ModelTransformation = self.datafile.GetField("ModelTransformationTag")
+        self.GeoKeyDirectory = self.datafile.GetField("GeoKeyDirectoryTag")
+        #self.GeoDoubleParams = self.datafile.GetField("GeoDoubleParamsTag")
+        self.GeoAsciiParams = self.datafile.GetField("GeoAsciiParamsTag")
+        self.GdalMetadata = self.datafile.GetField("GDAL_METADATA")
+                
+    def copy_extra_tags(self, rg):
+        # Check input
+        if not isinstance(rg, BaseTiffRaster):
+            raise TypeError("Input is not a raster!")
+        
+        # Ok, go ahead
+        if rg.pageNumber != None: self.pageNumber = rg.pageNumber
+        self.modelPixelScale = rg.modelPixelScale
+        self.modelTiepoint = rg.modelTiepoint
+        if rg.ModelTransformation != None: self.ModelTransformation = rg.ModelTransformation
+        self.GeoKeyDirectory = rg.GeoKeyDirectory
+        #self.GeoDoubleParams = rg.GeoDoubleParams
+        self.GeoAsciiParams = rg.GeoAsciiParams
+        self.GdalMetadata = rg.GdalMetadata
+        
+                
\ No newline at end of file

formats/bilraster.py

+# -*- coding: utf-8 -*-
+# Copyright (c) 2004-2015 Alterra, Wageningen-UR
+# Steven Hoek (steven.hoek@wur.nl), April 2015
+import os.path
+import stat
+import struct
+from array import array
+from math import fabs
+from bandraster import BandRaster
+try:
+    import numpy
+    HAS_NUMPY = True
+except ImportError:
+    HAS_NUMPY = False
+
+class BilRaster(BandRaster):
+    "A raster represented by 2 files, with extensions 'bil' and 'bil.hdr'"
+    
+    # TODO: change some function calls so that it's more obvious how to use "with" statements
+    # Use of such statements are essential when files are written to disk!
+    
+    # Data attributes - assign some dummy values for the mean time
+    DATAFILEXT = 'bil'
+    HEADEREXT = "hdr"
+    name = "dummy.bil";
+    WORLDEXT = "blw"
+    
+    def __init__(self, filepath, *dataformat):
+        # Initialise super class instance
+        BandRaster.__init__(self, filepath, dataformat[0])
+        self.byteorder = self.INTEL
+        self.pixeltype = self.UNSIGNEDINT
+    
+    def open(self, mode, ncols=1, nrows=1, nbands=3, xll=0, yll=0, cellsize=100, nodatavalue=256):
+        self.nbits = struct.calcsize(self.dataformat)*8
+        result = super(BilRaster, self).open(mode, ncols, nrows, nbands, xll, yll, cellsize, nodatavalue);
+        if (mode[0] == 'w'):
+            return result
+        else:
+            # Open the file
+            if os.path.exists(os.path.join(self.folder, self.name)):            
+                # Check given format string is valid
+                bytesperpix = 2 #default
+                try:
+                    bytesperpix = struct.calcsize(self.dataformat)
+                except:
+                    raise ValueError, "Supplied data format " + str(self.dataformat) + " is invalid"
+                # end try
+                
+                # Check file size matches with size attributes
+                fileinfo = os.stat(os.path.join(self.folder, self.name))
+                filesize = fileinfo[stat.ST_SIZE]
+                if (filesize == 0) and (mode[0] == 'w'):
+                    print "Empty BIL file found. I'm going to overwrite it ..."