Odd Image Display

[BrianHailey]

So, I downloaded 70+ images from the nationalmap.gov website. Now, I don't want to add each one of these individually so I select the multiple files when I add the images and they look odd, almost chess board like. 

http://screencast.com/t/Nb5x10dra5L8

If I add them one at a time, they don't have the checkered appearnce. Any idea on how to add them all at the same time and have them display correctly?

[Todd_Rogers]

I have had this happen from time to time.  Seems to be a glitch.  The way that I fixed it was to go into the Options, Select 3D Generation, and change the Generator Threads count.  I changed mine to 10 and had the issues with the images.  Then changed it to 4, restarted the program and the images were fine.

[konstantin_baumann]

Do your images have an alpha channel? Are your image tiles seamless or do they overlap a bit?

If you can provide a 3x3 tiles sample dataset I can have a deeper look into this.

[BrianHailey]

The images are just GeoTIF files that I downloaded from nationalmap.gov. I'll see if I can get a tile group together for you. Not sure how big they will be but I'll do my best.

I tried editing the Generator Threads as suggested by Todd with no success.

[BrianHailey]

So, I got the nine images showing the issue and here is what they look like in the model:

http://screencast.com/t/KD82G2t3v4

And this is how they look when I bring them into MAP 3D

http://screencast.com/t/ISHKEQ2xcs 

I have the files in the zip file but it's almost 1 gig. I'll contact you via e-mail about getting the files to you.

[konstantin_baumann · Accepted solution]

Reporting back to the forum:

The provided images have 4 color channels: red, green, blue, and a 4th one, which looks either like a near infrared or like a gray-scale version of the RGB channels.

In the default settings, AIM assumes to use RGB + alpha mask for a 4 channel image, which is not appropriate in this case, since the 4th channel is definitely not an alpha channel; so you have several options here to setup the import correctly:

1. use the RGB channels only: switch to "RGB" for Raster->Band Mapping->Type
2. use the 4th channel as grayscale: switch to "Gray" for Raster->Band Mapping->Type and select the 4th band for the "gray" channel below
3. use the 4th channel as near infrared: switch to "RGB" for Raster->Band Mapping->Type and select the 4th band for the "red" channel below

[BrianHailey]

That did the trick! Thanks for the help!