Need help reading a IMG data file for elevation data

IceShock

IceShock

IceShock

Soldato
Joined
16 Dec 2005
Posts
4,054
Location
Halifax W'Yorkshire
Hey guys, right im going to tear my hair out tonight if I don't find a way of doing this.


Basically, I need to convert some elevation data from

http://viewer.nationalmap.gov/viewer/

to replicate what im doing incase it might help show you what im trying to do, tick on the left, elevation index>1/9 arc (which is what I NEED no less). then click the arrow in the blue box at top, select a area the top option, then Elevation DEM Products, and the download is IMG file

I need to somehow read or convert the IMG file that the elevation data is packed into, into some sort of either PNG, or just some sort of general high resolution heightmap that is readable by daylon leveller.

(daylon leveller can open pretty much ANYTHING apart from a img file which is annoying as hell tonight anyway)


Thanks for any help guys, been searching for 2 hours and no closer to reading this damn img file.

Cheers!
 
Also I'll PayPal a 5er to the first person who can explain how to convert a img to a high quality useable bitmap/png or any other file that daylon leveller can use.

Thanks :)

Also if you want to earn a tenner on top read my other topic in the general thread :)
 
Mynight said:
Can you post a link to the file you've got(Dropbox or whatever). Whatever I downloaded isn't recognised by my system and it doesn't appear to have a file extention :confused:.
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Sorry

Should have included a link to the file im trying to convert. my bad,

Was just browsing forums on my phone in bed, and saw your reply and its that important it jumped straight out of bed to upload it :D

If you can convert this file + show me how to convert these img files to a usable heightmap image or data etc for daylon leveller, the 5er is yours :)

http://www.filedropper.com/ned19n38x50w077x00vaninenortherncos2011

Thanks :)

Gotta get some sleep now up at 8.30am, but will be back on forums at 11:30am ish :)
 
Mynight said:
Right I think there's an issue with the file you linked to.

This is all that's shown even when using the right program to open it(annoyingly the same as photoshop I whinged about earlier);

Capture.png


However if that is correct(I'm assuming not) here are two versions;

Jpg;

http://s000.tinyupload.com/index.php?file_id=07301821833103673739

or tiff;

http://s000.tinyupload.com/index.php?file_id=96700481183769488376

with tfw;

http://s000.tinyupload.com/index.php?file_id=09344370420937611440

Let me know if this works and if so I'll trust you instructions.

Thanks to Rozzy for mentioning the HFA filetype.
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Yes! that's what im looking for, a heightmap like that, I must have fudged up the img file tho because well, haha no idea what that small part is of the area I was trying to do.

how did you do it? :)

Thanks!
 
Mynight said:
Arrgh good idea. When and where can I play it? :D.

I expect to be in the credits :D.

"Mynight- random Google hero"
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Haha, well the game is mx vs atv reflex, going to use the data to create a realistic replica of some motocross tracks.

But meh, so far its not working unfortunately the data from that program isn't high quality enough.


If you want another google project you could try find these for me

http://forums.overclockers.co.uk/showthread.php?t=18663718

I know it exists because someone has them but they wont share them with me haha but they managed to find them on the web, I cant find it tho for the life in me.

lookin for heightmaps of glen Helen raceway CA, he got the heightmaps from earthquake scans etc of the fault line close by, and was just lucky that the track was scanned when they scanned the fault line

:)
 
Mynight said:
Already had a quick look and the closest I came up with was;

http://cms.sbcounty.gov/gis/FTPServices.aspx

If the government site doesn't have it chances are it isn't online yet.

Stupidly uses FTP so I've requested access to confirm if its covered.

Edit: Meh 18kbs for a 200mb file :(. I dont want to help that much :D.



If you want to do it yourself.
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downloaded filezilla, no idea how to work it tho but im sure ill figure this out haha
 
just keeps saying error could not connect.

whats this thing do iv actually no idea what im doin here :D haha or what it is supposed to do.
 
Ooo sweet, its downloading cheers :)

any idea which one I need to download? jeeeeze 20kb/s

so far im just downloadin the lot but this will take weeks lol
 
haha I know, and okay cheers dude :)

top man for finding all this for me! I guess ill set this up on the laptop and leave it downloading overnight :)

19 hrs it will take. damn

56k dial up eat ya heart out
 
Mynight said:
:( best I can find is 1/3 arc seconds :(.

Ill have another crack at finding it later.

Maybe offer the guy who has it £15? :D
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Lol I offered him 40, he wont share!

also, you got the link for 1/3 arc sec? idealy need 1/9 but ill take any I can get of this area right now :D haha
 
Mynight said:
The 1/3 arcs are on the site you linked to in first post. When you hit download select the top option drop the rectangle and it gives you a load of choices.

Now for £40 I could be persuaded to give you the secret link I have yet to find :D.
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haha :P
 
Mynight said:
Bit of a shot in the dark but would this work?

http://pubs.usgs.gov/of/2003/of03-293/sanbern_map.pdf

(bottom right)
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nah unfortunately not, not even close lol.


The downloads from that ftp thing will be done in 1 hr 20 mins btw, dno where I got 19 hrs from I calculated that wrong :D


Btw the area was scanned in 2005 if that helps, that's what Iv been told when they scanned it cause of the earthquake
 
Mynight said:
Yeah that was for scanning the fault lines in Andreas in 2003 they caught some of bernardino.

Back to google I go. If I haven't hit gold in the next 30 mins I'll have to give up for now sorry.
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haha no problem, I appreciate you helping me tho, your a legend :)
 
Scotty123 said:
You could always just go from the photos if you can't get the data? A little bit of extra work, but nothing too much.

As an example, I took your image from the other thread as you don't have data for that. I don't want to spend more than 1 minute tuning the greys in GIMP for nice peaks etc so I just turned it white where the track was and used it as a displacement map.

Obviously looks silly in my example and it's just to demonstrate, but if you spend more than one minute on it, you can get the effects you want, the relative heights through the greyscale etc.

screen.jpg
Click to expand...

I could do but the amount of work that would take is rediculess would take months, Id be better starting from scratch

also mynight, the files I downloaded from the ftp thing are .shp files, any idea on how to extract the stuff I need from them? :p
 
Nah all them files was useless there just like road maps lol. meh

ah well think ill give up on lookin for this data, its just annoying knowing it exists and that I cant find it lol
 
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