How to Get Real Height Data

m121c
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Re: How to Get Real Height Data

Postby m121c » Mon Nov 21, 2011 11:15 pm

1/9 was not available for that track. I moved on to a diffrent track and it does have 1/9.(It does a resembelance of a track) So I downloaded the refrence and the geotiff. Opened in microdem and converted the geotiff to grayscale and save it as a png. Then I opened it in photoshop and lined it up with the refrence photo. The image is 538 x 518 and is pretty close to the track. Here is a picture of the refrence:
Image

Now my question is where do I go from here? How do I make it so the size of the track is accurate in the game? I also need help to figure the scale of the track. I understand to use the excel spreadsheet but I dont exactly know what part that is for? Thanks for any help that is given.
I can post any of the files if anyone wants to look at them.

kona309
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Re: How to Get Real Height Data

Postby kona309 » Sat Dec 03, 2011 10:07 pm

Does anybody know were i can grab decent data for wild rose MX in Calgary,AB, Canada?
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haggqvist
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Re: How to Get Real Height Data

Postby haggqvist » Sat Dec 17, 2011 9:42 pm

Try here.
Image

kona309
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Re: How to Get Real Height Data

Postby kona309 » Sat Dec 17, 2011 11:09 pm

Thanks Hagg, but i gave it a try and couldnt seem to get good enough data out of it.
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rafagas
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Re: How to Get Real Height Data

Postby rafagas » Thu Jan 05, 2012 10:36 pm

Hi,

I'm trying to find the height data of my local track in Spain (41º 32' N, 2º 13' E) . The problem is that as yzmxer608 said, not every place have the DEM data. Take a look at the link below to see the option that I got.

http://data.geocomm.com/catalog/SP/datalist.html

I downloaded "Digital Terrain Elevation Data" because is the most similar to the DEM but it doesn't work when I try to open with Microdem. And I can't use the method explained by Haggqvist because only works in the US.

Any idea of what can I do?

Thanks.
Image

die996
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Re: How to Get Real Height Data

Postby die996 » Thu Jan 05, 2012 11:41 pm

rafagas wrote:Hi,

I'm trying to find the height data of my local track in Spain (41º 32' N, 2º 13' E) . The problem is that as yzmxer608 said, not every place have the DEM data. Take a look at the link below to see the option that I got.

http://data.geocomm.com/catalog/SP/datalist.html

I downloaded "Digital Terrain Elevation Data" because is the most similar to the DEM but it doesn't work when I try to open with Microdem. And I can't use the method explained by Haggqvist because only works in the US.

Any idea of what can I do?

Thanks.

Hey, tío. Te has tenido que equivocar con las coordenadas, Google maps me manda a una calle de Mollet

Hey, man. You must be mistaken with the coordinates, Google maps send me to some street in Mollet
Howcanyoubesofuckingdumbthatyou'rereadingthis??

die996
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Re: How to Get Real Height Data

Postby die996 » Thu Jan 05, 2012 11:42 pm

die996 wrote:
rafagas wrote:Hi,

I'm trying to find the height data of my local track in Spain (41º 32' N, 2º 13' E) . The problem is that as yzmxer608 said, not every place have the DEM data. Take a look at the link below to see the option that I got.

http://data.geocomm.com/catalog/SP/datalist.html

I downloaded "Digital Terrain Elevation Data" because is the most similar to the DEM but it doesn't work when I try to open with Microdem. And I can't use the method explained by Haggqvist because only works in the US.

Any idea of what can I do?

Thanks.

Hey, tío. Te has tenido que equivocar con las coordenadas, Google maps me manda a una calle de Mollet

Hey, man. You must be mistaken with the coordinates, Google maps send me to some street in Mollet

Track is here http://maps.google.es/maps?hl=en&ll=41. ... 6&t=h&z=16

Por cierto, me encanta que intentes hacer una réplica de ese circuito, he estado allí montones de veces

Btw, I love it that you're trying to make a replica of that track, I've been there a ton of times
Howcanyoubesofuckingdumbthatyou'rereadingthis??

rafagas
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Re: How to Get Real Height Data

Postby rafagas » Mon Jan 09, 2012 9:58 pm

rafagas wrote:Hi,

I'm trying to find the height data of my local track in Spain (41º 32' N, 2º 13' E) . The problem is that as yzmxer608 said, not every place have the DEM data. Take a look at the link below to see the option that I got.

http://data.geocomm.com/catalog/SP/datalist.html

I downloaded "Digital Terrain Elevation Data" because is the most similar to the DEM but it doesn't work when I try to open with Microdem. And I can't use the method explained by Haggqvist because only works in the US.

Any idea of what can I do?

Thanks.


Can someone help me?

Thanks
Image

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haggqvist
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Re: How to Get Real Height Data

Postby haggqvist » Mon Jan 09, 2012 10:19 pm

I had a look at the track in Google Earth and as it seems quite flat and the only non-commercial data available is the 90m resolution SRTM data I would suggest making it from scratch.
Image

rafagas
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Re: How to Get Real Height Data

Postby rafagas » Mon Jan 09, 2012 10:40 pm

haggqvist wrote:I had a look at the track in Google Earth and as it seems quite flat and the only non-commercial data available is the 90m resolution SRTM data I would suggest making it from scratch.


Yeah, this one is pretty flat but my objective is to make Bellpuig replica in the future and I wanted to make this one with this programs as a way of "training". But if I can't, doesn't matter I'll make this one from 0 and for Bellpuig I'll have to use the one that I made for MVA as a base
Image

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haggqvist
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Re: How to Get Real Height Data

Postby haggqvist » Mon Jan 09, 2012 11:02 pm

I use this plugin for Google Earth to access the SRTM data.
It's a bit tricky to get an aligned orthophoto for the elevation data though.
You could try this method, I haven't tried it myself but it looks good.
Image

rafagas
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Re: How to Get Real Height Data

Postby rafagas » Tue Jan 10, 2012 4:06 pm

Ok, I used the second method and now I have three files: the track on gray scale.jpg plus two more files (.prj and .jpgw) But now, I don't know what to do. I open with MapWindow and I get this:

Image

This is the original image
Image

As you can see, the original is in 2D but when I open with MapWindow it becomes kind of 3D image this is an improve but now..... what do I have to do? I'm so lost. :(


Thank you
Image

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haggqvist
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Re: How to Get Real Height Data

Postby haggqvist » Tue Jan 10, 2012 9:46 pm

The grayscale .jpg is the actual orthophoto you can use as a reference decal for the track, or to use for reference when making a high-res color one.

The .jpgw file is what is commonly refferred to as a world-file; it's a plain text-file that contains the orthoreference information for the .jpg image i.e. the coordinates for the top left pixel in the image and the scale of each pixel.

The .prj files contains info about the datum i.e. what geographic coordinate system the coordinates in the world-file are in.

If you would open a file with the elevation data for, say the whole of Spain, in a GIS e.g. Mapwindow, the .jpgw and .prj files above makes it possible to place your .jpg orthoimage as an overlay in exactly the right place automatically.

I suggest reading the excellent explanation of the files here.

In this case you'll need the information in the .jpgw file to cut out the exact same area from the SRTM elevation in Microdem using the tool "Keyboard corners" that you can access by RMB->Modify map area->Keyboard corners.
Just put your calculated coordinates from the world-file in the appropriate boxes and the map image should cover the exact same area as your orthoimage.

Make sure that both the orthoimage and the SRTM data uses the same datum first though, if not you'll need to convert the image to the same datum as the SRTM dataset. If I remember correctly you can do that in Microdem as well.

From looking at the image in your post I'll suggest that you export a new image from Google Earth that covers a much larger area.
You can always cut it down to size later in Photoshop together with your base terrain from Microdem.
Just make sure it's possible to make out enough detail to enable you to align a high-res orthophoto later.
Image

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yzmxer608
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Re: How to Get Real Height Data

Postby yzmxer608 » Wed Jan 11, 2012 1:44 am

I think we need to get you to write a new tutorial for this instead of me :lol:.
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BrutalMX
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Re: How to Get Real Height Data

Postby BrutalMX » Wed Jan 11, 2012 6:21 am

yzmxer608 wrote:I think we need to get you to write a new tutorial for this instead of me :lol:.

Agreed, I think a detailed tutorial by Hagg could help many.
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