1man(1)                                                   srtm2sdf
2man(1)
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6[1mNAME[0m
7       srtm2sdf  ‐  Generate  SPLAT Data Files (SDFs) from  3‐arc
8second STS‐99
9       Space  Shuttle  Topography Mission (SRTM‐3) elevation data
10files.
11
12[1mSYNOPSIS[0m
13       [1msrtm2sdf [22m[options] file
14
15[1mDESCRIPTION[0m
16       [1msrtm2sdf [22mis a utility  that  generates  SPLAT  Data
17Files (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
42[1mOPTIONS[0m
43       The  srtm2sdf utility accepts command‐line options as fol‐
44lows:
45
46       ‐d     used to specify the directory path to the  location
47of  existing
48              SDF  files  The ‐d option overridesthe default path
49specified in
50              your $HOME/.splat_path file.
51
52       ‐n     used to specify the  elevation  (in  meters)  below
53which SRTM  data
54              is   replaced.   Below  this  limit, SRTM elevation
55data is either
56              replaced using existing SDF  equivalent  files,  or
57averaged  among
58              adjacent   elevation   data   points.  The  default
59threshold for the
60              replacement limit is sea‐level (0   meters).    Un‐
61less  elevations
62              below   sea‐level  are  known  to exist for the re‐
63gion being pro‐
64              cessed by the srtm2sdf utility, the ‐n option  need
65not be speci‐
66              fied.
67
68[1mEXAMPLES[0m
69       srtm2sdf  N40W074.hgt
70
71       srtm2sdf ‐d /cdrom/sdf N40W074.hgt
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73       srtm2sdf ‐d /dev/null N40W074.hgt
74
75       srtm2sdf ‐n ‐5 N40W074.hgt
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78[1mFILES[0m
79       [4m/usr/bin/srtm2sdf[0m
80
81[1mSEE ALSO[0m
82       [1msplat[22m(1),
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84[1mBUGS[0m
85       No known bugs at this time.
86
87[1mAUTHOR[0m
88       Sindre Pedersen Bjordal (foolish@guezz.net)
89
90[1mHISTORY[0m
91       2007 ‐ Text copyed from README
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951.0                                  09       December       2007
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