1man(1)                                                   srtm2sdf
2man(1)
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6NNAAMMEE
7       srtm2sdf  ‐  Generate  SPLAT Data Files (SDFs) from  3‐arc
8second STS‐99
9       Space  Shuttle  Topography Mission (SRTM‐3) elevation data
10files.
11
12SSYYNNOOPPSSIISS
13       ssrrttmm22ssddff [options] file
14
15DDEESSCCRRIIPPTTIIOONN
16       ssrrttmm22ssddff is a utility  that  generates  SPLAT  Data  Files
17(SDFs) from 3‐arc
18       second   STS‐99  Space Shuttle Topography Mission (SRTM‐3)
19elevation data
20       files. This data is of a much higher quality   than   that
21contained  in
22       older  USGS  Digital  Elevation Models of the same resolu‐
23tion. However,
24       many  SRTM‐3  Version  2  elevation  models  contain  data
25"voids" and "wells"
26       that are the consequence of the radar mapping process.
27
28       The   srtm2sdf  utility  has the ability to detect and re‐
29place SRTM data
30       outliers with equivalent SDF data created through the  us‐
31gs2sdf  utility
32       (below).  If  equivalent USGS‐derived SPLAT Data Files are
33not available,
34       SRTM outliers are handled either  through  adjacent  pixel
35averaging,  or
36       by   threshold   limiting  using user‐specified limits. Of
37all three meth‐
38       ods, the USGS‐derived SDF replacement  method  yields  the
39best results.
40
41
42OOPPTTIIOONNSS
43       The  srtm2sdf utility accepts command‐line options as fol‐
44lows:
45
46
47       ‐d     used to specify the directory path to the  location
48of  existing
49              SDF  files  The ‐d option overridesthe default path
50specified in
51              your $HOME/.splat_path file.
52
53
54       ‐n     used to specify the  elevation  (in  meters)  below
55which SRTM  data
56              is   replaced.    Below  this limit, SRTM elevation
57data is either
58              replaced using existing SDF  equivalent  files,  or
59averaged  among
60              adjacent   elevation   data  points.   The  default
61threshold for the
62              replacement limit is sea‐level (0   meters).    Un‐
63less  elevations
64              below   sea‐level  are  known  to exist for the re‐
65gion being pro‐
66              cessed by the srtm2sdf utility, the ‐n option  need
67not be speci‐
68              fied.
69
70EEXXAAMMPPLLEESS
71       srtm2sdf  N40W074.hgt
72
73       srtm2sdf ‐d /cdrom/sdf N40W074.hgt
74
75       srtm2sdf ‐d /dev/null N40W074.hgt
76
77       srtm2sdf ‐n ‐5 N40W074.hgt
78
79
80FFIILLEESS
81       _/_u_s_r_/_b_i_n_/_s_r_t_m_2_s_d_f
82
83SSEEEE AALLSSOO
84       ssppllaatt(1),
85
86BBUUGGSS
87       No known bugs at this time.
88
89AAUUTTHHOORR
90       Sindre Pedersen Bjrdal (foolish@guezz.net)
91
92HHIISSTTOORRYY
93       2007 ‐ Text copyed from README
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971.0                                  09       December       2007
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