Creating a multi-band GeoTIFF
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# If the processing toolbox is not visible in you [[QGIS]] window yet, select {{mitem|text=Processing --> Toolbox}}. | # If the processing toolbox is not visible in you [[QGIS]] window yet, select {{mitem|text=Processing --> Toolbox}}. | ||
# In the processing toolbar, type {{typed|text=merge}} into the search field to find the {{button|text=merge}} tool and open it. | # In the processing toolbar, type {{typed|text=merge}} into the search field to find the {{button|text=merge}} tool and open it. | ||
| − | # Click the {{button|text=...}} button to select the layers you want to combine. There are different reasonable ways to combine spectral bands, depending on the information you want to obtain: | + | # Click the upper {{button|text=...}} button to select the layers you want to combine. There are different reasonable ways to combine spectral bands, depending on the information you want to obtain: |
#* True color (RGB=3,2,1) simulates the natural color. | #* True color (RGB=3,2,1) simulates the natural color. | ||
#* Standard false color (RGB=4,3,2) makes healthy vegetation generally appear red. | #* Standard false color (RGB=4,3,2) makes healthy vegetation generally appear red. | ||
#* False color (RGB=5,4,3 or 4,5,3) tends to distinguish different landcover material. | #* False color (RGB=5,4,3 or 4,5,3) tends to distinguish different landcover material. | ||
| + | # In the {{button|text=Layer stack}} pulldown-menu, select {{button|text=Yes}}. | ||
| + | # Click the bottom {{button|text=...}} button to select directory and file name to save the result. You can skip this step if you only want to save the result temporarily. | ||
| + | # Check the box {{button|text=Open output file after running algorithm}} (if not checked per default) and click {{button|text=Run}} | ||
Revision as of 16:47, 8 December 2013
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This section is still under construction! This article was last modified on 12/8/2013. If you have comments please use the Discussion page or contribute to the article! |
- This exercise is part of the QGIS Tutorial 2013/14.
In this exercise you will learn how to create images of several bands of satellite data, and how to georeference a raster image.
Multiband layers
To create a multiband image:
- Load the different satellite band layers into QGIS. For exercise purposes, you can use the landsat-bands from the directory geodata/raster/landsat/ in the course data; the layer names start with sub, the band number is indicated by B and a one- or two-digit number, e.g. B1 or B10 for the first band and B1 or B20 for the second.
- If the processing toolbox is not visible in you QGIS window yet, select Processing --> Toolbox.
- In the processing toolbar, type merge into the search field to find the merge tool and open it.
- Click the upper ... button to select the layers you want to combine. There are different reasonable ways to combine spectral bands, depending on the information you want to obtain:
- True color (RGB=3,2,1) simulates the natural color.
- Standard false color (RGB=4,3,2) makes healthy vegetation generally appear red.
- False color (RGB=5,4,3 or 4,5,3) tends to distinguish different landcover material.
- In the Layer stack pulldown-menu, select Yes.
- Click the bottom ... button to select directory and file name to save the result. You can skip this step if you only want to save the result temporarily.
- Check the box Open output file after running algorithm (if not checked per default) and click Run
