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IMG2GOOGLE(1)                Generic Mapping Tools               IMG2GOOGLE(1)

NAME
       img2google - Create Google Earth KML overlay tiles from bathymetry
       Mercator img grid

SYNOPSIS
       img2google -Rwest/east/south/north[r] [ imgfile ] [ -Amode[altitude ] ]
       [ -C ] [ -Ffademin/fademax ] [ -Gprefix ] [ -LLODmin/LODmax ] [
       -Nlayername ] [ -Tdoctitle ] [ -UURL ] [ -V ] [ -Z ]

DESCRIPTION
       img2google reads a 1x1 minute Mercator surface relief img file and
       creates a Google Earth overlay KML file and associated PNG tile for the
       specified region.  If no input file is given we use topo.11.1.img.

       -R     west, east, south, and north specify the Region of interest, and
              you may specify them in decimal degrees or in
              [+-]dd:mm[:ss.xxx][W|E|S|N] format.  Append r if lower left and
              upper right map coordinates are given instead of w/e/s/n.  The
              two shorthands -Rg and -Rd stand for global domain (0/360 and
              -180/+180 in longitude respectively, with -90/+90 in latitude).
              Alternatively, specify the name of an existing grid file and the
              -R settings (and grid spacing, if applicable) are copied from
              the grid.

OPTIONS
       imgfile
              An img format bathymetry/topography file such as those created
              by Sandwell and Smith.  If this files does not exist in the
              current directory and the user has set the environment variable
              $GMT_DATADIR, then img2mercgrd will try to find imgfile in
              $GMT_DATADIR.

       -A     Selects one of 5 altitude modes recognized by Google Earth that
              determines the altitude (in m) of the image: G clamped to the
              ground, g append altitude relative to ground, a append absolute
              altitude, s append altitude relative to seafloor, and S clamp it
              to the seafloor [Default].

       -C     Turn on clipping so that only portions below sea level will be
              visible in the image [no clipping].

       -F     Sets the distance over which the geometry fades, from fully
              opaque to fully transparent. These ramp values, expressed in
              screen pixels, are applied at the minimum and maximum end of the
              LOD (visibility) limits, respectively.  [no fading (0/0)].

       -G     Specify the prefix for the output image file (the extensions are
              set automatically). Default uses the naming
              topoN|S<north>E|W<west>.

       -L     Measurement in screen pixels that represents the minimum limit
              of the visibility range for a given Region Google Earth
              calculates the size of the Region when projected onto screen
              space. Then it computes the square root of the Region's area
              (if, for example, the Region is square and the viewpoint is
              directly above the Region, and the Region is not tilted, this
              measurement is equal to the width of the projected Region). If
              this measurement falls within the limits defined by LODmin and
              LODmax (and if the region is in view), the Region is active. If
              this limit is not reached, the associated geometry is considered
              to be too far from the user's viewpoint to be drawn. LODmax
              represents the maximum limit of the visibility range for a given
              Region. A value of -1, the default, indicates "active to
              infinite size." [always active].

       -N     Append the layername of the image (use quotes if strings contain
              spaces) [topoN|S<north>E|W<west>].

       -T     Append the document title (use quotes if strings contain spaces)
              ["Predicted bathymetry"].

       -U     By default, images are referenced locally relative to the KML
              file.  Specify an URL to prepend a server address to the image
              name reference [local].

       -V     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].

       -Z     Uses zip (which must be installed) to create a *.kmz file for
              easy distribution; append * to delete the KML and PNG file after
              zipping [No zipping].

EXAMPLES
       To create a 10x10 degree Google Earth KML tile for the region -R
       170/180/20/30 using the default topo.11.1.img and output naming
       convention, try

       img2google -R 170/180/20/30

       To make the same tile with the previous topo.10.1.img, run in verbose
       mode, clip so only oceanic areas are visible, name the output oldimage,
       specify the KML metadata directly (including setting the image altitude
       to 10 km), and make a single *.kmz file, try

       img2google topo.10.1.img -R 170/180/20/30 -AA10000 -C -Goldimage -N"My
       KML title" -T"My KML title" -U http://my.server.com/images -V -Z

DATA SETS
       For topo.11.1.img and other Sandwell/Smith altimetry-derived Mercator
       grids, visit http://topex.ucsd.edu.

SEE ALSO
       GMT(1), img2grd(1) img2mercgrd(1) ps2raster(1)

GMT 4.5.14                        1 Nov 2015                     IMG2GOOGLE(1)