The Background of the RGB image window

ghazalphds · January 31, 2018, 2:01pm

I created RGB image window but the problem that I have background with different color and I want to delete the background in order to use it in google earth or QGIS

ABraun · January 31, 2018, 3:03pm

can you please post a screenshot of your RGB and the background?

ghazalphds · January 31, 2018, 3:47pm

This is the RGB image window and I want to delete the background or the layer that have yellow color

ABraun · January 31, 2018, 4:23pm

Which layers are used for red, green and blue?

ghazalphds · January 31, 2018, 4:43pm

R: VV db
G: VHdb
B: VVlin / VHlin

Note
db =decibel
lin=linear

ghazalphds · January 31, 2018, 5:02pm

Do you think there is problem in the Geocoding because I use Geometric, terrain correction and then Range Doppler terrain correction instead of using SAR-simulation terrain correction

ghazalphds · January 31, 2018, 5:48pm

I solved the problem, thank you very much

ghazalphds · January 31, 2018, 5:58pm

How can I export the RGB window to QGIS or google earth

ABraun · January 31, 2018, 6:03pm

no, they do the same. The second one works better if you have pronounced topography.

But I now see what you mean. For me it is black, even if all three images have transparent background:

One possible workaround would be to digitize a polygon for the desired area and clip the whole raster with the land sea mask tool. Make sure to save your product before this step.

Result:

works

ABraun · January 31, 2018, 6:04pm

How can I export the RGB window to QGIS or google earth

Google Earth: File > Export > Other > Google Earth kmz
QGIS: File > Export > Other > View As Image > Select GeoTiff

ghazalphds · January 31, 2018, 6:21pm

Thank you very much, but what are the benefits of having RGB window. is it related to the classification?

ABraun · January 31, 2018, 6:29pm

RGB is just one of many ways to visualize your data. You can compare which information ist stored in different rasters. Only you can answer if that helps you in a way

ghazalphds · January 31, 2018, 6:31pm

so, you means RGB has no relation with classsification

ghazalphds · January 31, 2018, 6:33pm

it is just visualization of the data with RGB instead of gray and dark as it is available by SAR

ABraun · January 31, 2018, 6:38pm

exactly. It may show you which classes or surfaces are separable by a later classification but it is not yet one.

ghazalphds · January 31, 2018, 6:39pm

Thanks for your help

DianeChen · December 27, 2018, 9:17am

I have the same question,and I use the way to polygon first,then ‘Mask-Land/Sea mask’. However,the result is the polygon area with the same colorful background.Can you guide me to delete the background? Thank you very much.

ABraun · December 27, 2018, 10:52am

please provide a screenshot before and after the masking so we can understand your problem.

DianeChen · December 27, 2018, 11:03am

The white background is the mask result, and the green one is the original image.

ABraun · December 27, 2018, 1:08pm

Should work actually.

grafik

If you create an RGB composite based on a band maths expression (for example VV/VH), the background value is sometimes neglected. Calculate a permanent band from it and define the nodata value and it should be transparent.