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No help maybe but here's URLs to the two programs mentioned there at the gtopo30
web page.
http://www.esri.com/software/arcview/index.html
http://www.esri.com/software/arcinfo/index.html
I think it just comes down to the change in data format.
See the section 5.0 here in the readme:
http://edcdaac.usgs.gov/gtopo30/README.html#h15
Bob
news:38F77ED9.C7DC260C@club-internet.fr...
| So, is there a way I can convert this 'simple binary raster format' ? With
| Photoshop 5 maybe.
| I have to say that I have never heard of this file format.
|
| If anyone knows if/how it can be converted. I tried to open it as a RAW file
with
| different options, but all I get is a blurry image.
|
|
| Thanks
|
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|
| > Check out the FAQ there, this type of DEM is not ASCII.
| > http://edcdaac.usgs.gov/gtopo30_faq.html
| >
| > Bob
| >
| > |
| > | I read the readme file, but it does not say how to handle the files.
| > |
| > |
| > | I have the feeling that the DEM file is not a proper one ( The DEM
extension
| > | is not correct here).
| > |
| > | I downloaded the file from :
| > | http://edcdaac.usgs.gov/gtopo30/gtopo30.html
| > |
|
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OK,
I have to admit, that this was error in my code, after all. It was this
infamous and old trick: "opening-binary-files-in-text-mode", which from
time to time tortures those programmers who code in MS-DOS. Now it
should work OK, so virtual trip to Hawaii (and around the world) is
possible. I've uploaded new version to binaries.utilities. Note, that it
has different options now (e.g. scaling is not performed by default).
Post a reply to this message
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>
> So, is there a way I can convert this 'simple binary raster format' ? With
> Photoshop 5 maybe.
> I have to say that I have never heard of this file format.
>
> If anyone knows if/how it can be converted. I tried to open it as a RAW > file with
> different options, but all I get is a blurry image.
>
Have you tried my coverter? I've uploaded new version to
binaries.utilities, which converts those files to POV-Ray .TGA
heightfield format.
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Vahur Krouverk wrote:
>
> OK,
>
> I have to admit, that this was error in my code, after all. It was this
> infamous and old trick: "opening-binary-files-in-text-mode", which from
> time to time tortures those programmers who code in MS-DOS. Now it
> should work OK, so virtual trip to Hawaii (and around the world) is
> possible. I've uploaded new version to binaries.utilities. Note, that it
> has different options now (e.g. scaling is not performed by default).
OK,
I tried it on Hawaii again and (I really hate to tell you this) the
results were worse than with your original utility. Before I could
at least see the islands now they are skewed all over the place. In
the areas were there is no height data in the .dem file are ok but
anywhere there is height date it's all messed up.
:(
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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> So, is there a way I can convert this 'simple binary raster format' ? With
> Photoshop 5 maybe.
> I have to say that I have never heard of this file format.
I had the same problems with files from the server you mentioned.
To open it with Photoshop, do the following :
- with a text editor, open one of the small files (don't remeber the extension),
where you'll find the number of raws and columns;
- open the first large file with PhotoShop, as "raw", and enter the dimensions you
found in the small file.
If you can't do it, tell me and I'll redo the openings to tell you exactly how to
procced.
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Ken wrote:
>
> OK,
>
> I tried it on Hawaii again and (I really hate to tell you this) the
> results were worse than with your original utility. Before I could
> at least see the islands now they are skewed all over the place. In
> the areas were there is no height data in the .dem file are ok but
> anywhere there is height date it's all messed up.
>
> :(
>
DUH!
Yes, this was worse version... I've cancelled message and posted again
version, which should be better. Sorry.
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Yes, I tried to convert it with your utility, but it crashes and says :
Exiting due to signal SIGSEGV
General Protection Fault at eip=00002758.....
The file I downloaded is the western part of Africa called W020N40_tar.gz, just in
case....
> >
> > So, is there a way I can convert this 'simple binary raster format' ? With
> > Photoshop 5 maybe.
> > I have to say that I have never heard of this file format.
> >
> > If anyone knows if/how it can be converted. I tried to open it as a RAW > file
with
> > different options, but all I get is a blurry image.
> >
> Have you tried my coverter? I've uploaded new version to
> binaries.utilities, which converts those files to POV-Ray .TGA
> heightfield format.
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I managed to find a file that read 6000 x 4800 ( width and height)
I tried to open the file with Photoshop as a RAW file with all the possibilities I
could think of, and none of them works..
Thanks if you can help.
>
> > So, is there a way I can convert this 'simple binary raster format' ? With
> > Photoshop 5 maybe.
> > I have to say that I have never heard of this file format.
>
> I had the same problems with files from the server you mentioned.
> To open it with Photoshop, do the following :
> - with a text editor, open one of the small files (don't remeber the extension),
> where you'll find the number of raws and columns;
> - open the first large file with PhotoShop, as "raw", and enter the dimensions you
> found in the small file.
>
> If you can't do it, tell me and I'll redo the openings to tell you exactly how to
> procced.
>
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>
> Yes, I tried to convert it with your utility, but it crashes and says :
>
> Exiting due to signal SIGSEGV
> General Protection Fault at eip=00002758.....
>
> The file I downloaded is the western part of Africa called W020N40_tar.gz, just in
> case....
>
What operating system are you using? Win95,
98, NT, 2000? What processor? Did you convert whole dem file or part of
it? What options did you use? Does program outputs something before
crashing? Map file shows, that this address belongs to memory allocation
subroutine, do you have enough resources in case of 9x?
Was it new version or did you used old version?
P.S. I found, that my program does not convert negative values
correctly. I'd like to hear opinions, how they should be converted? One
option is to assign minimum value (i.e. maximum negative value) to level
0
and raise all other points with respect to it.
But this means that sea level will be above zero level and it
could produce problems with sea rendering: it will
be hard to determine correct value for sea color map, even if program
will
output sea level value. Is there other options?
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'MicroDEM' is a very easy way to extract and initially display most forms of
DEM data.
I have used it with great success with the same format materials.
Provides an easy way to preview the scene, and make a fly through. Data can
then be saved as .bmp.
DVJ
Ken <tyl### [at] pacbell net> wrote in message
news:38F717AC.16B7A618@pacbell.net...
>
>
> Vahur Krouverk wrote:
>
> > If my memory serves me correctly, then I've used files from same site
> > and the set of files seems to be OK. File size is probably OK too, my
> > memory failed here: whole package was probably >80 MB. Have you tried my
> > converter (see my previous post)?
>
> I just downloaded a dem from that site and the two utilities I have for
> conversion choked on them too. I then downloaded your utility and while
> it was able to read the file and convert it to a .tga image there was
> erroneous data in the resulting .tga the rendered it useless to me.
> The dem I downloaded is of the Hawaiian Islands (w180n40.dem) which is
> fairly well centered in the data. When converted to tga, with your
> utility, there is a green colored stripe going directly through the
> island chain (directly in the middle of the image) running left to
> right. It takes up a sizable chunk of real estate
>
> Any idea what may be causing that ?
>
> --
> Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
> http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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