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default is '-1', which specifies the 'best' dataset. This is ignored
unless -all is asserted, and you can probably ignore it too.

These options are also available on all of the 'height_*' commands.

=item height_af

 satpass> height_af latitude longitude

Afghanistan is handled by L<height_us|/height_us>, since this is
(supposedly) covered by the U.S. Geological Survey's Afghanistan
Digital Elevation Model.

=item height_as

 satpass> height_as latitude longitude

American Samoa is handled by L<height_us|/height_us>.

=item height_ca

 satpass> height_ca latitude longitude

This command is equivalent to L<height_us|/height_us> and in fact is
handled by it since the U.S. Geological Survey dataset includes all of
North America. But in order to cover some observed weirdness in the
data returned, -source_layer is defaulted to 'SRTM.C_1TO19_3' and
-retry_on_zero is defaulted to 3.

=item height_fm

 satpass> height_fm latitude longitude

The Federated States of Micronesia are handled by L<height_us|/height_us>.

script/satpass  view on Meta::CPAN

 satpass> height_pw latitude longitude

Palau is handled by L<height_us|/height_us>.

=item height_us

 satpass> height_us latitude longitude

This command attempts to look up the height above sea level at the
given latitude and longitude in the U.S. Geological Survey's EROS
Web Services (L<http://gisdata.usgs.gov/>). If the lookup succeeds,
the latitude and longitude parameters are set to the arguments and
the height parameter is set to the result.

The latitude and longitude default to the current
L<latitude|/latitude> and L<longitude|/longitude> parameters.

If you wish to use this command, you must install the
B<Geo::Webservice::Elevation::USGS> module.