Re: [Geotools-devel] SRTM

[Simone G. <sim...@gm...>]

Hi Clay, Hi all,
I quickly checked the SRTM data source at USGS website and quoting from the=
m:

The "finished" data is available as SRTM format.
".....
The SRTM format is created from the SRTM DTED(r) and each cell will
consist of 5 files:
.bil
.blw
.hdr
.prj
.stx
....

The "finished" data is available in four formats:

>ArcGrid is a proprietary format, which is primarily used in ArcInfo.
Although some other software packages can also read this format. The
ArcGrid format is delivered as a workspace, which is not tarred or
gzipped.
>GRIDFLOAT is a non-proprietary format created by running the
GRIDFLOAT command in Arc. It is essentially a floating-point binary
data file with accompanying ASCII descriptor files.
>BIL is a non-proprietary format created by running the GRIDIMAGE
command in Arc. The BIL format will be more compact that the ArcGrid
format. It consists of an integer binary file with accompanying ASCII
descriptor files. The BIL integer format is recommended for software
packages that do not support floating-point data.
>TIFF is a 32 bit floating point grid format.
.....
"

Which of these formats where you referring to?
Some of them are very easy to implement, some others are not.

Could you tell me a bit more?

Simone.

The data is a simple binary raster format (signed integer data, 16
bit). There is an accompanying ASCII header file that provides file
size information (number of rows and columns). The data are stored in
row major order (all the data for row 1, followed by all the data for
row 2, etc.).
On 3/27/06, Simone Giannecchini <sim...@gm...> wrote:
> Hi clay, hi all,
> do you mind if we talk a bit about how to do implement it in the
> actual structure of geotools coverages. It is quite easy to write a
> coverage plugin, it is not as easy to write a *good* plugin.
> I have never taken a look at format of this data source but it would
> be interesting to use it for me. I am going to take a look at it and
> then I will get back with some thoughts and suggestions.
>
> Simone.
> =B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=
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> Simone Giannecchini
> Software Engineer
> Freelance Consultant
>
> http://simboss.wordpress.com/
>
> =B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=B0=
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>
>
> On 3/27/06, Jody Garnett <jga...@re...> wrote:
> > Clay Atkins wrote:
> > > Anybody doing an "SRTMGridReader"? If not, I'm going to do one.
> > Not that I know of, you could ask at todays IRC meeting. Are you set up
> > with svn access and everything you need? That is have you read the
> > developers guide, in particular the hacking section?
> >
> > Jody
> >
> >
> >
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> --
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--
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Simone Giannecchini
Software Engineer
Freelance Consultant

http://simboss.wordpress.com/

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