Hexagon Geospatial
MENU

ERDAS IMAGINE

Discuss and share topics of interest using ERDAS IMAGINE the world’s leading geospatial data authoring system.
Showing results for 
Search instead for 
Do you mean 
Reply
New Contributor
Posts: 2
Registered: ‎03-19-2019

pan-sharpened image was shifted spatially many pixels compared to the original panchromatic

Hi all,

 

We would like to pan-sharpen the imagery and orthorectify the pan-sharpened product. The imagery for pan-sharpening is multispectral (4 bands in a tif file format) and 1 panchromatic band (tif file format) processed to level 1B. 

We have tried three methods to pansharpen the images. The first method we tried was ArcMap using the Gram-Schmidt algorithm. The other two methods were NNDiffuse and hyperspherical color space resolution merge in ERDAS IMAGINE. We then will orthorectify these using ERDAS IMAGINE. However, we have run into problems with these above methods:

  • When we imported the pansharpened imagery from ArcMap using Gram-Schmidt, to ERDAS IMAGINE, it was shifted spatially a large number of pixels compared to the original panchromatic image, even though the number rows and columns matched the original panchromatic imagery.
  • NNDiffuse Pan-Sharpening in ERDAS produced the right result but took seven hours to run. We will start processing this way, but it will take a long time to complete our project.
  • Hyperspherical colour space resolution merge in ERDAS ran much faster, but the pan-sharpened image was shifted spatially compared to the original panchromatic image.

Do you have any experience with these methods or have any suggestions on how we might fix these issues? Any comments and suggestions will be gratefully received.

 

Lien

Staff
Posts: 130
Registered: ‎06-30-2016

Re: pan-sharpened image was shifted spatially many pixels compared to the original panchromatic

Hi Lien,

 

NNDifuse pan sharpening method takes considerable time. We have addressed this by making use of GPU acceleration via OpenCL. This was done in ERDAS IMAGINE 2018 update 1.

 

If you have a Graphics Card that supports OpenCL, update your ERDAS IMAGINE to ERDAS IMAGINE 2018 update 1 or later and make use of the Open CL acceleration to spped up the processing.

 

Regards, Sam

 

 

Highlighted
New Contributor
Posts: 2
Registered: ‎03-19-2019

Re: pan-sharpened image was shifted spatially many pixels compared to the original panchromatic

Thank you for your suggestion. I will try GPU via OpenCL.

Do you need immediate support?
If you encounter a critical issue and need immediate assistance please submit a Service Request through our Support Portal.