1[4mman[24m(1)                                            srtm2sdf
2[4mman[24m(1)
3
4[1mNAME[0m
5       srtm2sdf  ‐  Generate  SPLAT Data Files (SDFs) from  3‐arc
6second STS‐99
7       Space  Shuttle  Topography Mission (SRTM‐3) elevation data
8files.
9
10[1mSYNOPSIS[0m
11       [1msrtm2sdf [22m[options] file
12
13[1mDESCRIPTION[0m
14       [1msrtm2sdf [22mis a utility  that  generates  SPLAT  Data
15Files (SDFs) from 3‐arc
16       second  STS‐99  Space  Shuttle Topography Mission (SRTM‐3)
17elevation  data
18       files.  This  data  is  of a much higher quality than that
19contained in
20       older  USGS Digital Elevation Models of the  same  resolu‐
21tion.  However,
22       many  SRTM‐3  Version  2  elevation  models  contain  data
23"voids" and "wells"
24       that are the consequence of the radar mapping process.
25
26       The   srtm2sdf  utility  has the ability to detect and re‐
27place SRTM data
28       outliers with equivalent SDF data created through the  us‐
29gs2sdf  utility
30       (below).  If  equivalent USGS‐derived SPLAT Data Files are
31not available,
32       SRTM  outliers  are handled either through adjacent  pixel
33averaging, or
34       by  threshold limiting using user‐specified limits. Of all
35three  meth‐
36       ods, the USGS‐derived SDF replacement  method  yields  the
37best results.
38
39
40[1mOPTIONS[0m
41       The  srtm2sdf utility accepts command‐line options as fol‐
42lows:
43
44       ‐d     used  to  specify the directory path to  the  loca‐
45tion of existing
46              SDF  files  The ‐d option overridesthe default path
47specified  in
48              your $HOME/.splat_path file.
49
50       ‐n     used  to specify the elevation  (in  meters)  below
51which SRTM data
52              is  replaced. Below this limit, SRTM elevation data
53is either re‐
54              placed using existing  SDF  equivalent  files,   or
55averaged  among
56              adjacent   elevation   data   points.  The  default
57threshold for the
58              replacement limit is sea‐level (0   meters).    Un‐
59less  elevations
60              below   sea‐level   are  known  to  exist  for  the
61region  being
62              processed by the srtm2sdf utility, the  ‐n   option
63need  not  be
64              specified.
65
66[1mEXAMPLES[0m
67       srtm2sdf  N40W074.hgt
68
69       srtm2sdf ‐d /cdrom/sdf N40W074.hgt
70
71       srtm2sdf ‐d /dev/null N40W074.hgt
72
73       srtm2sdf ‐n ‐5 N40W074.hgt
74
75
76[1mFILES[0m
77       [4m/usr/bin/srtm2sdf[0m
78
79[1mSEE ALSO[0m
80       [1msplat[22m(1),
81
82[1mBUGS[0m
83       No known bugs at this time.
84
85[1mAUTHOR[0m
86       Sindre Pedersen Bjordal (foolish@guezz.net)
87
88[1mHISTORY[0m
89       2007 ‐ Text copyed from README
90
911.0                                  09       December       2007
92[4mman[24m(1)
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