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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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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+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/mkindex.pl b/mkindex.pl
new file mode 100755
index 0000000..cfc6ac3
--- /dev/null
+++ b/mkindex.pl
@@ -0,0 +1,263 @@
+#!/usr/bin/perl
+
+# Copyright © 2013 Guilhem Moulin <guilhem@fripost.org>
+#
+# 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/>.
+
+use 5.010_000;
+use warnings;
+use strict;
+
+our $VERSION = "0.1, August 9, 2013";
+
+use Getopt::Long qw/:config posix_default no_ignore_case gnu_compat
+                            bundling auto_version auto_help/;
+use Pod::Usage;
+use File::Temp;
+
+use Geo::GDAL;
+use Geo::GDAL::Const; #qw/GRA_Bilinear/;
+use Geo::OSR;
+# http://geoinformatics.aalto.fi/doc/Geo-GDAL-1.9/html/
+
+use Inline 'C';
+
+my %config = ( progress   => Geo::GDAL->can('TermProgress_nocb') ?
+                                sub { Geo::GDAL::TermProgress_nocb(@_[0,1]) } :
+                                *Geo::GDAL::TermProgress
+             , debug      => 0
+             , resampling => &resamplings('near')
+             , rename     => 's/\.[^.]+$//'
+);
+
+
+GetOptions( "q|quiet"  => sub { delete $config{progress} }
+          , "d|debug"  => sub { $config{debug} = 1 }
+          , "rename=s" => sub { $config{rename} = $_[1] }
+          , "r|resampling=s"=> sub { $config{resampling} = &resamplings($_[1]) }
+          , "s_srs=s" => sub { $config{s_srs} = Geo::OSR::SpatialReference::->new();
+                               $config{s_srs}->SetFromUserInput( $_[1] ) }
+          , "t_srs=s" => sub { $config{t_srs} = Geo::OSR::SpatialReference::->new();
+                               $config{t_srs}->SetFromUserInput( $_[1] ) }
+          , "man"     => sub { pod2usage(-exitstatus => 0, -verbose => 2) }
+          )
+    or pod2usage(2);
+pod2usage(2) unless $#ARGV > 0;
+
+my $index = pop;
+my @mapset = @ARGV;
+
+&debug( "Using mapset:", map {"  - ".$_} @mapset );
+&debug( "Building index: $index" );
+
+
+# Find the source and target SRS
+unless ($config{s_srs}) {
+    foreach my $map (@mapset) {
+        &debug ("Opening '$map'");
+        my $ds = Geo::GDAL::Open($map, 'ReadOnly') or exit 1;
+
+        my $wkt = $ds->GetProjection();
+        die "Error: Missing projection for '$map'.\n" unless $wkt;
+
+        my $srs = Geo::OSR::SpatialReference::->new( $wkt );
+        if ($config{s_srs}) {
+            die "Error: Projection for '$map' differ from the previous input tiles'.\n"
+                unless $config{s_srs}->IsSame( $srs );
+        }
+        else {
+            $config{s_srs} = $srs;
+        }
+    }
+}
+
+$config{t_srs} //= $config{s_srs};
+&debug ("Using source SRS: $config{s_srs}");
+&debug ("Using target SRS: $config{t_srs}");
+
+
+# Working directory
+my $tmpdir = File::Temp::tempdir( CLEANUP => 1 );
+&debug ("Using working directory: '$tmpdir'.");
+
+# Ensure the existence of the internal driver.
+my $driver = 'GTiff';
+my $driver_opts = { INTERLEAVE => 'BAND'
+                  , TILED      => 'YES'
+                  , COMPRESS   => 'NONE'
+                  , BIGTIFF    => 'IF_NEEDED'
+                  , PROFILE    => 'BASELINE'
+                  , TFW        => 'YES'
+                  };
+my $driver_type = 'Byte';
+die "Error: Unknown driver: '$driver'.\n"
+    unless Geo::GDAL::GetDriverByName($driver);
+
+foreach my $map (@mapset) {
+    &debug ("Opening '$map'");
+    my $ds = Geo::GDAL::Open($map, 'ReadOnly') or exit 1;
+    &expand_rgba( \$ds );
+    &reproject(   \$ds );
+}
+
+
+#######################################################################
+
+# Print debug messages.
+sub debug {
+    print STDERR (join '', map {"DEBUG: " .$_. "\n"} @_) if $config{debug};
+}
+
+# Create a temporary file. The file is created to defeat race
+# conditions, but the file handle is closed right away.
+sub tempfile {
+    my ($fh, $name) = File::Temp::tempfile(DIR => $tmpdir, UNLINK => 1, @_);
+    close $fh;
+    &debug( "Creating file: '$name'" );
+    return $name;
+}
+
+# The available resampling methods. The strings can be found
+# with keys %Geo::GDAL::RESAMPLING_STRING2INT;
+sub resamplings {
+    my $r = shift;
+    my %h = ( near => 'NearestNeighbour'
+            , bilinear => 'Bilinear'
+            , cubic => 'Cubic'
+            , cubicspline => 'CubicSpline'
+    );
+    $h{$r};
+}
+
+# Expand a dataset to RGBA. This code is mostly a perl translation of pct2rgb(1).
+sub expand_rgba {
+    my $ds = shift;
+    my $src_ds = $$ds;
+
+    return unless $src_ds->{RasterCount} == 1;
+
+    my $src_band = $src_ds->GetRasterBand(1);
+    my $ct = $src_band->GetRasterColorTable() or return;
+
+    &debug("Expansion to RGBA required.");
+
+    my $dst_nb = 4;     # RGBA
+    my $src_nc = 256;   # That's the best we can do, as we're using bytes
+
+    my $lookup = [ map '', (0 .. $src_nc-1) ];
+    $src_nc = $ct->GetCount() if $ct->GetCount() < $src_nc;
+    for (my $i = 0; $i < $src_nc; $i++) {
+        my @e = $ct->GetColorEntryAsRGB( $i );
+        $lookup->[$_] .= chr $e[$_] for (0 .. $dst_nb-1);
+    }
+
+    my $dst_filename = tempfile(SUFFIX => '.tif');
+    my ($xSize, $ySize) = $src_ds->Size();
+    my $dst_ds = Geo::GDAL::GetDriverByName($driver)->Create( $dst_filename
+                                                            , $xSize
+                                                            , $ySize
+                                                            , $dst_nb
+                                                            , $driver_type
+                                                            , $driver_opts
+                                                            );
+
+    $dst_ds->SetProjection( $src_ds->GetProjection() );
+    $dst_ds->SetGeoTransform([ $src_ds->GetGeoTransform() ]);
+    $dst_ds->SetGCPs( $src_ds->GetGCPs(), $src_ds->GetGCPProjection() )
+        if $src_ds->GetGCPCount();
+
+    &{$config{progress}}(0.0) if $config{progress};
+    for (my $y = 0; $y < $ySize; $y++) {
+        my $src_data = $src_band->ReadRaster(0, $y, $xSize, 1);
+
+        for (my $b = 0; $b < $dst_nb; $b++) {
+            local $_ = $src_data;
+            # We use an inlined C function to speed up things a bit.
+            # Essentially what we're doing is a splice through the
+            # lookup table.
+            # Using strings is much more efficients that huge perl
+            # array of scalars. A pure perl version, not so much slower
+            # than our C code, can be obtained using transliteration:
+            #   my $src_str = join '', map chr, (0 .. $src_nc-1);
+            #   eval "tr/\Q$src_str\E/\Q$lookup->[$b]\E/";
+            &subst ( $_, $lookup->[$b], $xSize );
+            $dst_ds->Band(1+$b)->WriteRaster(0, $y, $xSize, 1, $_);
+        }
+
+        &{$config{progress}}( (1+$y) / $ySize )
+            if $config{progress};
+    }
+
+    # Erase (hence flush and close) the previous dataset
+    $$ds = $dst_ds;
+    return $dst_filename;
+}
+
+
+# Reproject the map. This code is inspired from
+# http://jgomezdans.github.io/gdal_notes/reprojection.html
+sub reproject {
+    my $ds = shift;
+    my $src_ds = $$ds;
+
+    my ($src_xSize, $src_ySize) = $src_ds->Size();
+
+    my $tx = Geo::OSR::CoordinateTransformation::->new( $config{s_srs}, $config{t_srs} );
+    my @src_geo = $src_ds->GetGeoTransform();
+    my ($ulx, $uly, $ulz) = $tx->TransformPoint( $src_geo[0], $src_geo[3] );
+    my ($lrx, $lry, $lrz) = $tx->TransformPoint( $src_geo[0] + $src_geo[1]*$src_xSize,
+                                               , $src_geo[3] + $src_geo[5]*$src_ySize );
+    die "Error: Could not transform point.\n"
+        if grep { $_ eq 'inf' } ($ulx, $uly, $ulz, $lrx, $lry, $lrz);
+
+    my $ratio = 64; # TODO: should be computed
+    my ($dst_xSize, $dst_ySize) = ( int( ($lrx-$ulx) / ($src_geo[1]*$ratio) )
+                                  , int( ($lry-$uly) / ($src_geo[5]*$ratio) ) );
+    &debug("Reducing map from ${src_xSize}x${src_ySize} to ${dst_xSize}x${dst_ySize}.");
+
+    my $dst_filename = tempfile(SUFFIX => '.tif');
+    my $dst_ds = Geo::GDAL::GetDriverByName($driver)->Create( $dst_filename
+                                                            , $dst_xSize
+                                                            , $dst_ySize
+                                                            , $src_ds->{RasterCount}
+                                                            , $driver_type
+                                                            , $driver_opts
+                                                            );
+
+    my $t_srs_wkt = $config{t_srs}->ExportToWkt();
+    $dst_ds->SetProjection( $t_srs_wkt );
+    $dst_ds->SetGeoTransform([ $ulx, $src_geo[1]*$ratio, $src_geo[2]
+                             , $uly, $src_geo[4],        $src_geo[5]*$ratio ]);
+
+    my $res = Geo::GDAL::ReprojectImage( $src_ds, $dst_ds,
+                                       , $config{s_srs}->ExportToWkt(), $t_srs_wkt
+                                       , $config{resampling}, undef, undef
+                                       , $config{progress} );
+    die "Error: Failed to reproject map " . join (', ', map {"'".$_."'"}
+                                                        $src_ds->GetFileList() )
+                                          . ".\n"
+        if $res;
+    return $dst_filename;
+}
+
+
+__END__
+
+__C__
+
+void subst (unsigned char *data, unsigned char *lookup, int length) {
+    int i;
+    for (i = 0; i < length; i++)
+        data[i] = lookup[ data[i] ];
+}
diff --git a/mkindex.py b/mkindex.py
new file mode 100755
index 0000000..46c5af1
--- /dev/null
+++ b/mkindex.py
@@ -0,0 +1,198 @@
+#!/usr/bin/python
+
+import sys, os, tempfile
+import gdal, osr
+from gdalconst import *
+
+try:
+    import numpy as Numeric
+    Numeric.arrayrange = Numeric.arange
+except ImportError:
+    import Numeric
+
+from argparse import ArgumentParser
+
+parser = ArgumentParser( description = "Build an index file from a mapset." )
+parser.add_argument( 'files', metavar='file', nargs='+'
+                   , help = 'A mapset tile' )
+parser.add_argument( 'index', metavar='index'
+                   , help = 'The destination index' )
+parser.add_argument('-q', '--quiet', action='store_true', help='Be quiet')
+parser.add_argument('-d', '--debug', action='store_true', help='Debug')
+args = parser.parse_args()
+
+progress = None
+if not args.quiet:
+    try:
+        progress = gdal.TermProgress_nocb
+    except:
+        progress = gdal.TermProgress
+
+# Ensure that GeoTiff is supported
+format = 'GTiff'
+dst_driver = gdal.GetDriverByName(format)
+if dst_driver is None:
+    sys.stderr.write('"%s" driver not registered.\n' % format)
+    sys.exit(1)
+
+def debug(msg):
+    if args.debug:
+        sys.stderr.write(msg)
+
+def temptif():
+    (h, f) = tempfile.mkstemp(suffix = '.tif', dir = tmpdir)
+    debug( 'Creating temporary file "%s"\n' % f )
+    os.close(h)
+    return f
+
+# Expand a palette into RBA. This code is mostly taken from pct2rgb(1).
+def expand_rgba( src_filename ):
+
+    src_ds = gdal.Open( src_filename )
+    if src_ds is None:
+        sys.stderr.write('Unable to open "%s".\n' % src_filename)
+        sys.exit(1)
+    if src_ds.RasterCount != 1:
+        return src_filename
+
+    out_bands = 4 # RGBA
+    src_band = src_ds.GetRasterBand(1)
+    ct = src_band.GetRasterColorTable()
+    if ct is None:
+        return src_filename
+
+    n = 256
+    lookup = [ Numeric.arrayrange(n)
+             , Numeric.arrayrange(n)
+             , Numeric.arrayrange(n)
+             , Numeric.ones(n)*(n-1) ]
+
+    for i in range(min(n,ct.GetCount())):
+        entry = ct.GetColorEntry(i)
+        for c in range(4):
+            lookup[c][i] = entry[c]
+
+    dst_filename = temptif()
+    dst_ds = gdal.GetDriverByName(format).Create(
+                dst_filename,
+                src_ds.RasterXSize, src_ds.RasterYSize,
+                out_bands
+             )
+
+    dst_ds.SetProjection( src_ds.GetProjection() )
+    dst_ds.SetGeoTransform( src_ds.GetGeoTransform() )
+    if src_ds.GetGCPCount() > 0:
+        dst_ds.SetGCPs( src_ds.GetGCPs(), src_ds.GetGCPProjection() )
+    
+    progress( 0.0 )
+    for iY in range(src_ds.RasterYSize):
+        src_data = src_band.ReadAsArray(0,iY,src_ds.RasterXSize,1)
+    
+        for iBand in range(out_bands):
+            band_lookup = lookup[iBand]
+    
+            dst_data = Numeric.take(band_lookup,src_data)
+            dst_ds.GetRasterBand(iBand+1).WriteArray(dst_data,0,iY)
+    
+        progress( (iY+1.0) / src_ds.RasterYSize )
+
+    dst_ds = None
+    return dst_filename
+
+
+# Reduce (and reproject if necessary) the given map.
+def reduce_map( src_filename ):
+
+    src_ds = gdal.Open( src_filename )
+    if src_ds is None:
+        sys.stderr.write('Unable to open "%s".\n' % src_filename)
+        sys.exit(1)
+    
+    src_prj = src_ds.GetProjection()
+    dst_prj = osr.SpatialReference()
+    dst_prj.ImportFromEPSG ( 3067 )
+    tx = osr.CoordinateTransformation ( src_prj, src_prj )
+
+    src_geo = src_ds.GetGeoTransform();
+    (ulx, uly, ulz ) = tx.TransformPoint( src_geo[0], src_geo[3])
+    (lrx, lry, lrz ) = tx.TransformPoint( src_geo[0] + src_geo[1]*src_ds.RasterXSize,
+                                          src_geo[3] + src_geo[5]*src_ds.RasterYSize )
+    res = 64; # TODO: should be computed
+    (w, h) = ( int((lrx - ulx)/(src_geo[1]*res)) , int((lry - uly)/(src_geo[5]*res)) )
+    print (w,h);
+
+    dst_filename = '/tmp/test.tiff' #temptif()
+    dst_ds = gdal.GetDriverByName(format).Create( dst_filename, w, h, src_ds.RasterCount )
+
+    dst_geo = ( ulx, src_geo[1]*res, src_geo[2], uly, src_geo[4], src_geo[5]*res )
+    dst_ds.SetGeoTransform( dst_geo )
+    dst_ds.SetProjection ( dst_prj.ExportToWkt() )
+    
+    res = gdal.ReprojectImage( src_ds, dst_ds, src_prj.ExportToWkt(),
+            dst_prj.ExportToWkt(), GRA_Bilinear, 0, 0.0, progress )
+    if not res:
+        sys.stderr.write('Unable to open "%s".\n' % src_filename)
+        sys.exit(1)
+
+    dst_ds = None
+    return dst_filename
+
+
+tmpdir = tempfile.mkdtemp()
+debug( 'Temporary working directory: "%s".\n' % tmpdir )
+
+for src_filename in args.files:
+    expanded = expand_rgba ( src_filename )
+    reduced  = reduce_map  ( expanded )
+
+
+sys.exit(1)
+
+
+src_filename = '/tmp/UV512_RVK_25.tiff'
+src_proj = osr.SpatialReference()
+src_proj.SetFromUserInput('epsg:3067')
+
+
+
+# http://jgomezdans.github.io/gdal_notes/reprojection.html
+src_filename = '/tmp/UV512_RVK_25.tiff'
+src_ds = gdal.Open( src_filename )
+if src_ds is None:
+    sys.stderr.write('Unable to open "%s".\n' % src_filename)
+    sys.exit(1)
+
+gtiff_driver = gdal.GetDriverByName( 'GTiff' )
+tif_ds = gtiff_driver.Create( '/tmp/zap.tiff', 300, 150, 4, GDT_Byte)
+
+#tx = osr.CoordinateTransformation ( src_ds.GetProjection(), src_ds.GetProjection() )
+geo_t = src_ds.GetGeoTransform ()
+x_size = src_ds.RasterXSize # Raster xsize
+y_size = src_ds.RasterYSize # Raster ysize
+# Work out the boundaries of the new dataset in the target projection
+(ulx, uly, ulz ) = tx.TransformPoint( geo_t[0], geo_t[3])
+(lrx, lry, lrz ) = tx.TransformPoint( geo_t[0] + geo_t[1]*x_size, \
+                                      geo_t[3] + geo_t[5]*y_size )
+new_geo = ( ulx, 147, geo_t[2], uly, geo_t[4], -147 )
+tif_ds.SetGeoTransform( new_geo )
+tif_ds.SetProjection ( osng.ExportToWkt() )
+gdal.ReprojectImage(src_ds, tif_ds, wgs84.ExportToWkt(), osng.ExportToWkt(), GRA_Bilinear)
+tif_ds = None
+
+
+#dataset = gdal.Open( filename, GA_ReadOnly )
+#
+#print 'Driver: ', dataset.GetDriver().ShortName,'/', \
+#      dataset.GetDriver().LongName
+#print 'Size is ',dataset.RasterXSize,'x',dataset.RasterYSize, \
+#      'x',dataset.RasterCount
+#
+#def get_spatialref(prj):
+#    spatialref = osr.SpatialReference()
+#    spatialref.SetFromUserInput(prj)
+#    return spatialref
+#
+#sp1 = get_spatialref('epsg:3067')
+#sp2 = get_spatialref('+proj=utm +zone=35 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs')
+#
+#print sp1.IsSameGeogCS(sp2)