Revisions for Introduction to Remote Sensing

[baharmon]

PCA of multiband images

The CLI and Python commands have a space after landsat8_2024_B4 that cause the commands to fail.

i.pca input=landsat8_2024_B2,landsat8_2024_B3,landsat8_2024_B4, landsat8_2024_B5,landsat8_2024_B6,landsat8_2024_B7 output=Flagstaff_landsat8

Replace with this for CLI:

i.pca input=landsat8_2024_B2,landsat8_2024_B3,landsat8_2024_B4,landsat8_2024_B5,landsat8_2024_B6,landsat8_2024_B7 output=Flagstaff_landsat8

& Python:

gs.run_command("i.pca", 
                input="landsat8_2024_B2,landsat8_2024_B3,landsat8_2024_B4,landsat8_2024_B5,landsat8_2024_B6,landsat8_2024_B7", 
                output=Flagstaff_landsat8)

[baharmon]

Image fusion with PCA results

In Visualizing PCA Results, the instructions say to set the histogram color to bcyr with r.colors -e map=Flagstaff_landsat8.1 color=bcyr etc. The results for the next section, however, need the histogram color set to grey to reproduce the same result as the figure. Add instructions to the Image Fusion with PCA Results section to redo the histogram: r.colors -e map=Flagstaff_landsat8.1 color=grey etc...

These sections would be much clearer if all the steps were included in code blocks.

[pahalsrivastava]

Hi @baharmon,
I’ve created a PR [ #107 ] with the requested updates for this tutorial:
I) Fixed PCA CLI and Python command spacing
II) Added the missing histogram reset to grey in the “Visualizing PCA results” section
III) Wrapped all relevant commands in code blocks for clarity