+ ================
+ SPLAT! Utilities
+ ================
+
Utilities for use with SPLAT! software are found under the
-splat-1.1.0/utils directory. They include the following:
+splat-1.1.1/utils directory. They include the following:
-citydecoder
-===========
-This utility reads U.S. Census Bureau files of Incorporated Places/Census
-Designated Places, and generates city/site data files for use with SPLAT!
-software. Files for use with this utility are available for download
-free of charge from:
- http://www.census.gov/geo/www/cob/bdy_files.html.
+srtm2sdf
+========
+The srtm2sdf utility generates SPLAT Data Files (SDFs) from 3-arc second
+STS-99 Space Shuttle Topography Mission (SRTM-3) elevation data files.
+This data is of a much higher quality than that contained in older USGS
+Digital Elevation Models of the same resolution. However, many SRTM-3
+Version 2 elevation models contain data "voids" and "wells" that are the
+consequence of the radar mapping process.
-Please select the ARC/INFO Ungenerate (ASCII) Metadata Cartographic Boundary
-Files from this site and unzip them prior to importing them to citydecoder.
-U.S. Census files are cataloged by the two digit FIPS code for the region
-(state) they represent. citydecoder takes as an argument the two-letter
-file prefix plus the FIPS code of the region or state being processed.
-For example:
+The srtm2sdf utility has the ability to detect and replace SRTM data
+outliers with equivalent SDF data created through the usgs2sdf utility
+(below). If equivalent USGS-derived SPLAT Data Files are not available,
+SRTM outliers are handled either through adjacent pixel averaging, or by
+threshold limiting using user-specified limits. Of all three methods,
+the USGS-derived SDF replacement method yields the best results.
- citydecoder pl34
+SRTM-3 Version 2 Elevation Data may be downloaded from:
-reads files "pl34_d00.dat" and "pl34_d00a.dat" that are extracted after
-the downloaded file has been unzipped, and generates a list of city names
-and geographical coordinates for the state of New Jersey (FIPS code 34).
-This data may be sorted and written to a file (cities.nj.dat) in the
-following manner:
+ ftp://e0srp01u.ecs.nasa.gov:21/srtm/version2/
- citydecoder pl34 | sort > cities.nj.dat
+Files available at this site are ZIP compressed, and must be
+uncompressed (using "unzip", or "gunzip -S .zip") prior to being
+processed by srtm2sdf.
-A list of FIPS codes (fips.txt) is included under splat/utils for your
-convenience.
+The srtm2sdf utility accepts command-line options as follows:
+
+-d: used to specify the directory path to the location of existing
+ SDF files (presumably created at an earlier date through the
+ usgs2sdf or postdownload utility) that are to be used to replace
+ outliers found in the SRTM data file. The -d option overrides
+ the default path specified in your $HOME/.splat_path file.
+
+-n: used to specify the elevation (in meters) below which SRTM data
+ is replaced. Below this limit, SRTM elevation data is either
+ replaced using existing SDF equivalent files, or averaged among
+ adjacent elevation data points. The default threshold for the
+ replacement limit is sea-level (0 meters). Unless elevations
+ below sea-level are known to exist for the region being
+ processed by the srtm2sdf utility, the -n option need not be
+ specified.
+
+Some examples of srtm2sdf use:
+
+ srtm2sdf N40W074.hgt
+
+ srtm2sdf -d /cdrom/sdf N40W074.hgt
+
+ srtm2sdf -d /dev/null N40W074.hgt (/dev/null prevents USGS data
+ replacement from taking place)
+
+ srtm2sdf -n -5 N40W074.hgt
+
+In all cases, SDF files are written into the current working directory.
usgs2sdf
postdownload uncompresses the DEM file, adds necessary record delimiters,
and invokes usgs2sdf to produce a SPLAT Data File (SDF).
-Digital Elevation Models may be downloaded from:
+USGS Digital Elevation Models may be downloaded from:
- http://edcsgs9.cr.usgs.gov/glis/hyper/guide/1_dgr_demfig/index1m.html
+ http://edcftp.cr.usgs.gov/pub/data/DEM/250/
Invoke postdownload with the name of each DEM file downloaded to
produce a database of SPLAT Data Files.
+citydecoder
+===========
+This utility reads U.S. Census Bureau files of Incorporated Places/Census
+Designated Places, and generates city/site data files for use with SPLAT!
+software. Files for use with this utility are available for download
+free of charge from:
+
+ http://www.census.gov/geo/www/cob/bdy_files.html.
+
+Please select the ARC/INFO Ungenerate (ASCII) Metadata Cartographic Boundary
+Files from this site and unzip them prior to importing them to citydecoder.
+U.S. Census files are cataloged by the two digit FIPS code for the region
+(state) they represent. citydecoder takes as an argument the two-letter
+file prefix plus the FIPS code of the region or state being processed.
+For example:
+
+ citydecoder pl34
+
+reads files "pl34_d00.dat" and "pl34_d00a.dat" that are extracted after
+the downloaded file has been unzipped, and generates a list of city names
+and geographical coordinates for the state of New Jersey (FIPS code 34).
+This data may be sorted and written to a file (cities.nj.dat) in the
+following manner:
+
+ citydecoder pl34 | sort > cities.nj.dat
+
+A list of FIPS codes (fips.txt) is included under splat/utils for your
+convenience.
+
+
fontdata
========
The fontdata utility reads Slackware gzipped console font data
---
John A. Magliacane, KD2BD
-January 2004
+March 2006
projects / debian / splat / blobdiff