Unfortunately, not all GIS and image processing packages read data in the same way. This means that it can be difficult to view your products immediately. For example, ENVI will open multispectral images without issue, probably because this is what it is designed to do. ArcGIS Pro and QGIS need a little more help. So if your data look like a big black box when you open them in either of these packages, here's what you need to do...
Thanks to Jas Singh for the sample data below. Notice that it looks great in GeoNadir, but when opened in a GIS, not so much!
Viewing multispectral orthomosaics in ArcGIS Pro
1. Right click your orthomosaic layer
2. Click "Zoom To Layer"
3. Click to open the map options
4. Click 'Explore'. This will allow you to determine pixel values in your image.
5. Click around the edges of your image until you see a very large value - here you can see I've found this number that is being used as the 'no data' value. This is what is skewing the display.
6. Select the really long number
7. Right click and "Copy"
8. You can close that pop up once you've copied the 'offending' value.
9. Right click your orthomosaic in the ToC
10. Click "Data"
11. Click "Export Raster"
12. Click in the area for 'NoData value'
13. Press [[Ctrl]] + [[V]] to paste the number
14. Click "Export"
15. Turn the original layer off in the ToC, or feel free to remove it. Remember to change the band combinations if you need to, as the default is unlikely to be what you need.
Visualizing multispectral data in QGIS
1. Click "Identify Features"
2. Click around your image to get a feel for the pixel value range
3. You'll see the results of your clicking over here. In this case, you can see that they are all less than one, except band 6. Band 6 is the 'alpha layer' that holds the 'no data' or areas that fill in the space to make a rectangle as required by a raster.
4. Now that you have the feel for these values, right click your dataset in the ToC
5. Click "Properties…"
6. Under symbology, double-click on the maximum value for the red display
7. Replace the value for each of the display bands with a number that's similar to the maximum value you saw in the previous step when you were clicking around your image. You can always come back and change this if you don't get it right.
8. Click "Apply"
9. Click "OK"
