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Vertical shift of background image

J

Johan

Messages
25
I'm working with a background image of 1341x1548 pixels, or 0.026° x 0.3°. The bottom Lat is at -25.3975°.

When I zoom in, on a certain point of zoom, the bottom part of the image then jumps up to a Lat of -25.394647°, that is a jump of 317m to the north. The remaining Latitude and Longitudes remains at the correct values.

Regards
Johan
 
Georeference again

Hi, Try to georeference again.

Pehraps there is some mistake in the coordinates you entered in FSX Planner.

Regards,

José
 
The coordinates are fine, I can even confirm that by measuring at the edges of the image. It will stay correct up to a certain point in the zoom, then only the image will be "squashed" by about 10%. The top Lat will still be correct, as well as the left and right Lon.

I have the image also in FSX, this was done from a GEOTIFF through resample. This custom terrain textures (background) aligns properly with GoogleEarth and maps. In FSX, the airport layout also aligns properly with the textures.

In FsX Planner, the airport initially aligns with the background image, it will stay aligned for a few zoom levels. From a certain point, the image will be "squashed" and the airport features will not align anymore.

Regards
Johan
 
Last edited:
Undertood now

Hi,

I did not understand you before I tested one image background. I think I got the same behaviour.

I ask Russell to test a big image at some zoom levels and at different positions on the screen.

The program becomes lazy and sometimes the image is vertically squezed, as you pointed out.

Regards,

José
 
I will test this to see what the cause is.

Does it only happen at high zoom levels? Or does it happen at any zoom level?

-Russell
 
Hi zoom

Hi, Russell

I found the problem when going to high zoom levels. The program can become very slow and the image can desappear totally.

Regards,

José
 
I am unable to duplicate this. I tried using a very large image (3200x2400 pixels) and zoomed all the way in and out several times and the position of the images stayed constant and correct the entire time. When half or more of the image was visible I did see a noticable slow down in zooming speeds, but that is expected as scaling a huge image does take time.

Perhaps you can give me more details, such as the airport, the image, and the image size that you are using?

-Russell
 
The image is 1341x1548 pix, covers an area of 0.026° x 0.03°. This calculate to an area of 2610.5m x 3333.6m or 1.4nm x 1.8nm, x values first. The image is in jpeg format and 352kb in this case.

The airport is FAKN in South Africa, S25.38789583°, E31.09786883°. The image was cropped to -25.3675, 31.092, -25.3975, 31.118.

At a high altitude zoom level, where I can see the complete airport, the runway, taxiways, etc align properly. However, when I zoom in (about 3 levels), the image shrinks, but only in the y axis. The bottom shifts up by about 317m.

Like I said, the image is only 352kb, the xml airport file is 136kb. If you want to, I can mail this to you.

I am using JAVA Standard Edition 6, Version 1.6.0 (Build 1.6.0.01-b06).

Regards
Johan
 

Attachments

  • FAKNAni.gif
    FAKNAni.gif
    83.6 KB · Views: 603
Yep- I get this same problem. The shift isnt as large but my image is smaller too, so it seems to be a function/percentage of the image size..?
 
Timmo said:
Yep- I get this same problem. The shift isnt as large but my image is smaller too, so it seems to be a function/percentage of the image size..?
Click to expand...

Is it possible for you to post the image and the xml file? (Don't really care about image quality, so feel free to reduce that if necessary)

-Russell
 
Ok wilco- It will have to wait until this evening as its on my home PC.

Its interesting to note that my image is in New Zealand which is also a fair way south (like Johan's in South Africa) so that may be part of the problem?
 
Shift still there

I have tested this with Release 21, still the same problem. If you want, I can attach (or try to) the image and xml file.

Otherwise a GREAT program, the best available!

Regards
Johan
 
Johan said:
I have tested this with Release 21, still the same problem. If you want, I can attach (or try to) the image and xml file.

Otherwise a GREAT program, the best available!

Regards
Johan
Click to expand...

First, thanks for the compliment! It's great to know that FSX Planner is helping people out!

Yes, please attach the image and xml file if you can. Don't worry about the image quality.

I haven't tested background images with airports in the southern hemisphere, so perhaps there is a bug there that I have been missing.

-Russell
 
I am in Southern hemisphere

Hi, Russell

rf360m said:
I haven't tested background images with airports in the southern hemisphere, so perhaps there is a bug there that I have been missing.
-Russell
Click to expand...

Excuse me, but the problem is found at high zoom level, yet.

Image almost desappears:

zoom1wo9.jpg


Reduced the zoom, but the image is not yet fully extended vertically

zoom2dw5.jpg

My geographic coordinates, both latitude and longitude, are negative values (Brasil).

Regards,

José

PS:

Zooming with the image centered on the screen, the error doesn't occur.
 
Last edited:
OK - so after some more testing there is definintely a bug that causes the background image to be displayed incorrectly at certain times. It seems to effect different airports by different amounts.

I'm not sure what the bug is yet, but we'll hopefully figure it out soon!

-Russell
 
Russell,

I don't know if this might be of any help, but I have now two smaller images covering the apron area. Zooming in or out does not effect them.

If you look closely in the attached jpeg, you will see that it is only the larger image causing the trouble. Sadly, sometimes the larger image is also required if you want to see where the windsocks, ILS hut, NBD, etc is.

Regards
Johan
 

Attachments

  • FAKN_Shift.jpg
    FAKN_Shift.jpg
    52 KB · Views: 529
Ok, it looks like we found the problem and have fixed it. We tested it on many different airports and inmages, including the ones posted here and it is now working properly at all zoom levels. This fix will be included in the next release.

-Russell
 
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