m.dted.extract(1)      Grass User's Manual	m.dted.extract(1)



NNAAMMEE
       mm..ddtteedd..eexxttrraacctt	- Extracts digital terrain elevation data
       (DTED - levels 1 and  2)  produced  and	supplied  by  the
       Defense Mapping Agency (DMA) on 1/2-inch magnetic tapes.
       _(_G_R_A_S_S _D_a_t_a _I_m_p_o_r_t_/_P_r_o_c_e_s_s_i_n_g _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       mm..ddtteedd..eexxttrraacctt	 iiff==_n_a_m_e   ooff==_n_a_m_e   hhff==_n_a_m_e   nn=="_s_t_r_i_n_g"
       ss=="_s_t_r_i_n_g" ee=="_s_t_r_i_n_g" ww=="_s_t_r_i_n_g"

DDEESSCCRRIIPPTTIIOONN
       _m_._d_t_e_d_._e_x_t_r_a_c_t extracts DTED (Levels 1 and 2) digital ter-
       rain elevation data produced by the Defense Mapping Agency
       (DMA) from 1/2-inch magnetic tapes obtained from DMA.

OOPPTTIIOONNSS
       Data is read from the input file (iiff).  If the  user  does
       not  specify  any input file name on the command line, the
       program assumes that input is coming from /dev/rmt0.   The
       extracted  data	is  placed in the output file (ooff).  This
       program should be used in conjunction  with  the  programs
       _m_._r_o_t_9_0	and  _r_._i_n_._l_l to convert DTED data to GRASS raster
       format.

   PPaarraammeetteerrss::
       iinnppuutt=_n_a_m_e
	      The pathname of the tape device where the raw  DTED
	      data exists (default is /dev/rmt0)

       oouuttppuutt=_n_a_m_e
	      The full pathname of the output file into which the
	      extracted tape data is to be copied

       hheeaaddeerr=_n_a_m_e
	      The full pathname of a file to contain  descriptive
	      information  about  the  extracted data;	should be
	      placed in the same directory as the output file

       nnoorrtthh= North latitude value defining the boundaries of the
	      extraction      geographic      region	 (format:
	      _d_d_._m_m_._s_s_[_n_|_s_])

       ssoouutthh= South latitude value defining the  extraction  geo-
	      graphic region (format: _d_d_._m_m_._s_s_[_n_|_s_])

       eeaasstt=  East  longitude  value defining the extraction geo-
	      graphic region (format: _d_d_._m_m_._s_s_[_e_|_w_])

       wweesstt=  West longitude value defining the  extraction  geo-
	      graphic region (format: _d_d_._m_m_._s_s_[_e_|_w_])

       The  nnoorrtthh,  ssoouutthh, eeaasstt and wweesstt parameters define a geo-
       graphic region that should completely encompass	the  data
       set.   _d_d_._m_m_._s_s	are  degree,  minute,  and second values.
       Only data that falls within this defined geographic region
       will be extracted from the tape.

EEXXAAMMPPLLEE
       The command line: mm..ddtteedd..eexxttrraacctt iinn==_/_d_e_v_/_r_m_t_0 oouutt==_d_t_e_d_._o_u_t
       hheeaadd==_d_t_e_d_._h_e_a_d	nn==_3_7_._3_0_._0_0_n   ss==_3_7_._1_5_._0_0_n    ee==_1_0_3_._3_0_._0_0_w
       ww==_1_0_3_._4_5_._0_0_w

       will  extract DTED data from /dev/rmt0, store it in a file
       named dted.out, and store some supporting  information  in
       the  file dted.head.  Only data that falls within the geo-
       graphic region defined by the  coordinates  nnoorrtthh,  ssoouutthh,
       eeaasstt and wweesstt will be extracted.

NNOOTTEE
       The  user  should  examine the contents of the header file
       produced by this program; it contains  information  needed
       as inputs to the data rotation and raster file import pro-
       grams _m_._r_o_t_9_0 and _r_._i_n_._l_l, respectfully.

BBUUGGSS
       The format of the header file for DTED Level 1 and 2  data
       was  changed  in  1987.	_m_._d_t_e_d_._e_x_t_r_a_c_t and _m_._d_t_e_d_._e_x_a_m_i_n_e
       only operate on DTED  data  containing  pre-1987  headers.
       DTED data containing the pre-1987 headers may be purchased
       from the DMA upon request.

DDIIAAGGNNOOSSTTIICCSS
       Invalid requests are so designated.

SSEEEE AALLSSOO
       _P_u_r_s_u_a_n_c_e _o_f _E_l_e_v_a_t_i_o_n _D_a_t_a, by Stuart Bradshaw, USACERL
       _D_T_E_D _a_n_d _D_E_M _E_l_e_v_a_t_i_o_n _D_a_t_a _E_x_t_r_a_c_t_i_o_n,	by  Stuart  Brad-
       shaw, Mary Martin, and Chester Kos, USACERL


       _g_._r_e_g_i_o_n

       _m_._d_m_a_U_S_G_S_r_e_a_d

       _m_._d_t_e_d_._e_x_a_m_i_n_e

       _m_._e_x_a_m_i_n_e_._t_a_p_e

       _m_._r_e_g_i_o_n_._l_l

       _m_._r_o_t_9_0

       _r_._d_e_s_c_r_i_b_e

       _r_._i_n_._l_l

       _r_._r_e_s_c_a_l_e

       _r_._s_l_o_p_e_._a_s_p_e_c_t

AAUUTTHHOORR
       Michael	 Shapiro,   U.S.Army   Construction   Engineering
       Research Laboratory

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_2_/_2_8 _1_2_:_4_7_:_2_5 _$



GRASS 5.0					m.dted.extract(1)
