1IMG2GOOGLE(1) Generic Mapping Tools IMG2GOOGLE(1)
2
6 img2google - Create Google Earth KML overlay tiles from bathymetry Mer‐
7 cator img grid
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10 img2google -Rwest/east/south/north[r] [ imgfile ] [ -Amode[altitude ] ]
11 [ -C ] [ -Ffademin/fademax ] [ -Gprefix ] [ -LLODmin/LODmax ] [ -Nlay‐
12 ername ] [ -Tdoctitle ] [ -UURL ] [ -V ] [ -Z ]
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15 img2google reads a 1x1 minute Mercator surface relief img file and cre‐
16 ates a Google Earth overlay KML file and associated PNG tile for the
17 specified region. If no input file is given we use topo.11.1.img.
18 -R west, east, south, and north specify the Region of interest, and
20 you may specify them in decimal degrees or in
21 [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r if lower left and
22 upper right map coordinates are given instead of w/e/s/n. The
23 two shorthands -Rg and -Rd stand for global domain (0/360 and
24 -180/+180 in longitude respectively, with -90/+90 in latitude).
25 Alternatively, specify the name of an existing grid file and the
26 -R settings (and grid spacing, if applicable) are copied from
27 the grid.
28
30 imgfile
31 An img format bathymetry/topography file such as those created
32 by Sandwell and Smith. If this files does not exist in the cur‐
33 rent directory and the user has set the environment variable
34 $GMT_DATADIR, then img2mercgrd will try to find imgfile in
35 $GMT_DATADIR.
36 -A Selects one of 5 altitude modes recognized by Google Earth that
38 determines the altitude (in m) of the image: G clamped to the
39 ground, g append altitude relative to ground, a append absolute
40 altitude, s append altitude relative to seafloor, and S clamp it
41 to the seafloor [Default].
42 -C Turn on clipping so that only portions below sea level will be
44 visible in the image [no clipping].
45 -F Sets the distance over which the geometry fades, from fully
47 opaque to fully transparent. These ramp values, expressed in
48 screen pixels, are applied at the minimum and maximum end of the
49 LOD (visibility) limits, respectively. [no fading (0/0)].
50 -G Specify the prefix for the output image file (the extensions are
52 set automatically). Default uses the naming
53 topoN|S<north>E|W<west>.
54 -L Measurement in screen pixels that represents the minimum limit
56 of the visibility range for a given Region Google Earth calcu‐
57 lates the size of the Region when projected onto screen space.
58 Then it computes the square root of the Region's area (if, for
59 example, the Region is square and the viewpoint is directly
60 above the Region, and the Region is not tilted, this measurement
61 is equal to the width of the projected Region). If this measure‐
62 ment falls within the limits defined by LODmin and LODmax (and
63 if the region is in view), the Region is active. If this limit
64 is not reached, the associated geometry is considered to be too
65 far from the user's viewpoint to be drawn. LODmax represents the
66 maximum limit of the visibility range for a given Region. A
67 value of −1, the default, indicates "active to infinite size."
68 [always active].
69 -N Append the layername of the image (use quotes if strings contain
71 spaces) [topoN|S<north>E|W<west>].
72 -T Append the document title (use quotes if strings contain spaces)
74 ["Predicted bathymetry"].
75 -U By default, images are referenced locally relative to the KML
77 file. Specify an URL to prepend a server address to the image
78 name reference [local].
79 -V Selects verbose mode, which will send progress reports to stderr
81 [Default runs "silently"].
82 -Z Uses zip (which must be installed) to create a *.kmz file for
84 easy distribution; append + to delete the KML and PNG file after
85 zipping [No zipping].
86
88 To create a 10x10 degree Google Earth KML tile for the region
89 -R170/180/20/30 using the default topo.11.1.img and output naming con‐
90 vention, try
91 img2google -R170/180/20/30
93 To make the same tile with the previous topo.10.1.img, run in verbose
95 mode, clip so only oceanic areas are visible, name the output oldimage,
96 specify the KML metadata directly (including setting the image altitude
97 to 10 km), and make a single *.kmz file, try
98 img2google topo.10.1.img -R170/180/20/30 -AA10000 -C -Goldimage -N"My
100 KML title" -T"My KML title" -Uhttp://my.server.com/images -V -Z
101
104 For topo.11.1.img and other Sandwell/Smith altimetry-derived Mercator
105 grids, visit http://topex.ucsd.edu.
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108 GMT(1), img2grd(1) img2mercgrd(1) ps2raster(1)
109GMT 4.5.6 10 Mar 2011 IMG2GOOGLE(1)