05-10-2017 01:16 AM
Dear Community Members,
I am cutting my teeth in RS and image processing so this gives me difficulties in carrying out some basic operations. Given that i am working towards generating a thesis , i have to be careful about each step i take in the image analysis process.
Here is my challenge :
Solved! Go to Solution.
05-10-2017 02:10 AM
The layer number refers to the band number within the image you are adding at the time. Therefore if you are adding a single layer image you can only have layer number (1). If you are adding a layer from a multispectral image, then you can choose which band to add, or you can add all bands.
For example, I have a 4 band multispectral sentinel image in the layer stack attached, I can ask it to only add in one band such as band number 3 into my layer stack. Then this will display as 'image(3).tiff'. Selecting all, in this case, would add in band (1)(2)(3)(4) from my one image.
If you only have one band in an image you can only add band number (1). Therefore, using the default 1 is absolutely fine.
If you are stacking Landsat7/8 Imagery it is easiest to use the import function in IMAGINE which stacks the data for you. Manage Data Tab> Import Data > Landsat-7 or Landsat 8 from USGS
Hope that clarifies things a little for you!
05-10-2017 02:39 AM
I am really grateful for your quick reply.
Let me use pictorial representations to explain what im struggling to understand and overcome.
As you can see
Maybe a quick video tutorial might help. I would truct the video from ERDAS community than I would trust any other on You tube
I count on your remote technical support. Its crucial
05-10-2017 02:55 AM
I just tried stacking the bands again and now doing it differently. I have just realized the following :
Thank you so much
05-10-2017 03:14 AM
I have found a video which may help you understand.
You can check your image afterwards by using the inquire cursor, to check the pixel values remain the same. Home Tab, left hand side, Inquire.
05-10-2017 03:38 AM
Dear Ms Emily,
Thank you so much for your video.
I have just watched it now and her ERDAS interface is exactly what i have . As you can see, all the individual bands she has added has been represented by ERDAS as ( b3).tiff 1; ( b4).tiff1 and so on EVEN when she changed the layer field to "All" after the addition of teh first band 1
Unlike the your ERDAS environmet picture you sent to me where the layers are listed as 1, 2, 3, 4 which allows ERDAS to place each band selection /addition into the highlighted layer in the drop down, 'mine and the one in video " DOESNT have this drop down of differnet layers
so the big question now is , is it ok to proceed with the band addition irrespective of whether ERDAS keeps the layer default number at 1 or All?
Or shoudl I be conscious of highling "All " before clicking to add a new band? I am just worried over this step because a mistake here can cause me some trouble in the assigning of bands to colour channels in the band composition of the multispectral environment
Please I request your kind indulgence in this simple but crucial step for me
05-10-2017 04:25 AM
There is no number option because your image only has one band/layer. So using either option will work, All or 1. As either way there is only one band to layer stack.
I've always used 1.
05-10-2017 05:12 AM
Dear Ms Emily,
Thank you once again. So in essence , you are saying that whether my layer field was left at "1" or "All' during my layer stacking process is inconsequential and that this will not alter ERDAS's logical arrangement of the bands in the approapraite layer and so by extention , it wil not affect my band composting in a false colour mode under Multispectral environment.
If that is true, that means that all the previous layer stacking process I did where the layer feild was left at "1" is correct !