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QMID, Lod values (xdim and ydim)

adon

adon

Messages
68
Country
unitedstates
Hi everyone! Still busy here. Anyways, I have a question regarding the XDIM and YDIM values. I know that you'll use either the Block size or the one pixel stuff values. My problem is that given a bitmap or whatever, how do you know what the XDIM and YDIM values are? Is there any way to calculate it by hand? (I love math so....:D)

Thanks for replies, project is going good. No eta or screenshots yet! sorry
 
arno

arno

Administrator
Staff member
FSDevConf team
Resource contributor
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32,883
Country
netherlands
Hi,

Normally you would know the resolution of your bitmap, is that not the case in your case? From that you can then determine all the needed information.
 
adon

adon

Messages
68
Country
unitedstates
Yeah. I have the dimensions. Let's say I have an aerial image of 3168x7489 pixels. Width is 3168, Height is 7489. So x is the width and y is the height, right? If I wanted the bitmap to show at . . . let's say LOD 20, how do you calculate that? Multiply or divide something?
 
H

HolgerSandmann

Resource contributor
Messages
392
Country
ca-britishcolumbia
Hi there,

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. If yours are in degrees and decimal minutes (the standard FSX display) then you need to convert them first: divide the decimal minutes part by 60 and add that as the fractional part to the degrees value.

Cheers, Holger
 
adon

adon

Messages
68
Country
unitedstates
Oh, so it's like finding slopes!! Ok, got it now. Converting the coordinates is easy so. . . thanks!! :cool: I'll try that.
 
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