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Problem calculating xdim and ydim for a bitmap

A

ahaka

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finland
Ok I'm not a mathematician, but I managed to calculate the xdim and ydim for one bitmap just fine, using the method I found in this forum by Holger Sandmann.

However, for my second image, even though I did the calculation the exact same way, the resample.exe processes only 2 cells, leaving me with a very small bgl file. This is not right for the image.

Here's the xdim and ydim values I got:
xDim = 1,0419359110169491525423728813559e-5
yDim = 1,0483739098837209302325581395349e-5


Is there more than one way you need to use to calculate these values?

The bitmap I'm using has following coordinates and dimensions:

North/East: -9.863447 and 120.225413
South/West: -10.094257 and 120.382787

Dimensions: 15104x22016 pixels


Thanks in advance,
Antti
 
Ok there must be something I'm not getting here. What is the proper way of calculating the xdim and ydim values for a photoscenery bitmap?

The one Ive tried was this:

if you have the NW (X1,Y1) and SE (X2,Y2) corner coordinates you can determine xdim and ydim as follows:

xdim = (X2-X1)/bitmap columns
ydim = (Y2-Y1)/bitmap rows

If either value is negative just discard the sign.


The coordinates need to be in decimal degrees.


But this is not really working out for me. Im using Windows calculator for this, but the values I get doesnt work with resample.exe.

Bitmap columns and rows means the amount of pixels am I correct?
 
Hi ahaka.

You need to include your INF file text for anyone to help with this.

Dick
 
Hi there,

seeing the inf would help but I notice that you used commas for the xDim/yDim values; those should be "." in the actual inf.

Cheers, Holger
 
Hi Holger,

I think it might have been my problem that I used comma instead of dot. I have now changed the symbol from windows control panel, so I should automatically get point as a decimal symbol now.

Anyway I dont have the original INF file anymore, as I projected the image with Global Mapper and got the xdim and ydim from there.

Funny though that the values I get from Global Mapper is different than when using calculator.
 
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