To
users of
PCI, ENVI, ERDAS, ILLWIS, ERMapper, IDRISI, etc
is a great free software.
This
means that it is not necessary
to have/use the PCI Geomatica software to use 4SM.
Your own favorite image
processing software will do, along with Openev.
- Openev is available for Windows
and for Linux.
- Ensure your computer has AcceleratedX
or the screen hangs/freezes!
- Image
format: 4SM uses the image format of PCI
Geomatica database.pix, whether BAND or FILE interleaving.
- Openev can read quite a great
number of image formats, in particular TIFF,
PCI, ENVI, ERDAS, ILLWIS,
ERMapper, IDRISI.
- OpenEV uses GDAL
(Geospatial Data Abstraction Library) for accessing raster files, so
any file formats supported by GDAL should be supported by OpenEV. The
original, and authoritative list of GDAL
Supported Formats should be checked for a current
format list, and
details of each format.
- Openev can export from
any of these formats to PCIDSK database.pix.
- 4SM then reads from and writes to
database.pix.
- 4SM now uses only Openev for
display of the image.
- The mask_mSE is now entirely
prepared
using 4SM.
- Then when finished, Openev is used
to write out the database.pix preferably to ERDAS.lan or TIFF.
- Georeferencing is supported.
This means that it is not
necessary
to have/use the PCI Geomatica software to use 4SM.
Your own favorite image processing software will do, along with Openev.
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Use  to
- create
a georeferenced database.pix
- load
it with your own raw image data from a TIFF file
- make
a mask mSE with 4SM only
This shall be the start of the first
4SM tutorial.
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- Get
ready
- Directory: make a
new working directory
- DownLoads: bring in
that directory a copy of 4sm.calls.zip
and 4sm.zip and 4sm_tutorial_xs_tarawa.zip
- Unzip
them: "unzip 4sm.calls.zip 4sm.zip 4sm_tutorial_xs_tarawa.zip"
- Yourimage: copy yourimage.tif from where
it resides into that directory
- That's if you want to
work
on
another image
- yourimage.tif is no
georeferenced: do not try to overlay shapefiles provided yet!
- launch
OPENEV and export yourimage.tif or yourimage.img or etc... into yourimage.pix in
PCIDSK format:
- Command Line: write an executable bash
command line script: see Prepare_your_working_environment
- That's if you want to work
on
another image: you would customize an existing script to the
specifics of your own image
- Actually, it is provided
for
the tarawa-subset image:
tarawa-subset.sh
- "gedit tarawa-subset.sh
&"
- 4SM executable:
- bring a copy of the 4SM
executable file
- actually, it is provided
for this tutorial
- chmod: check
that both are made executable: "chmod
a+rwx
4SM tarawa-subset.sh"
- MakePIX:
create
a georeferenced PCIDSK database
- -dB/PCI/tarawa-subset/27_1_0_0/3_1/650_600/714.5_162.54/1_1 with
27 8U channels, followed by one
16S
channel, 650 rows and 600 lines.
- /714.5_162.54/1_1: the
georeferencing provided is the coordinates of the center of the Upper
Left pixel
- the georeferencing pixel
needs not to be the UL pixel
- /714.5_162.54/100_250: would tell 4SM that the georeferencing
information referes to Row_100 and Line_250
- -MIS/Tarawa/Kiribati/SPOT/XS/NA/UTM_19_E008/.02_.02/01_JAN_1986
- UTM_19_E008 gives the
projection, UTM zone, and ellipsoid
- .02_.02 gives the
sizeXpixel
and the sizeYpixel in same units as coordinates of UL pixel center,
either meters or kilometers
- -MakePIX/FILE/8/Z20
this shall create the tarawa-subset
.pix database in PCIDSK format, with FILE interleaving, and eight
pseudo color tables
- Import
your raw data: run tarawa-subset.sh to import raw image
data
- -Import/yourimage/dbnc_3_0_0_0/650_600/1,3_1,3/dbiw_0_0_650_600
- from channel_1_to_3
of yourimage.pix
- into channel_1_to_3 of
tarawa-subset.pix
- ==>
your raw data have been loaded into channels 1, 2 and 3 of database
tarawa-subset.pix:
- ==>
check it out by displaying with Openev.
- You
may use the Openev project file tarawa-subset.opf
to
prepare mask mSE in channel_4
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