Co-registration with SNAP
From AWF-Wiki
(Difference between revisions)
| Line 1: | Line 1: | ||
* Start SNAP Desktop | * Start SNAP Desktop | ||
* {{mitem|text=File --> Open Product...}}. Browse for Unmanned Aerial System (UAS) ortho mosaics: | * {{mitem|text=File --> Open Product...}}. Browse for Unmanned Aerial System (UAS) ortho mosaics: | ||
| − | {{typed|text=\geodata\uas\clip_ebee_ortho_align.tif}} is a reference image which is very well georeferenced. {{typed|text=\geodata\uas\clip_mavic_ortho_align.tif}} is an image with | + | {{typed|text=\geodata\uas\clip_ebee_ortho_align.tif}} is a reference image which is very well georeferenced. {{typed|text=\geodata\uas\clip_mavic_ortho_align.tif}} is an image with a positional offset. It needs to be registered to the reference image. {{button|text=Open}} or drag and drop marked files from Windows File Explorer into the SNAP '''Product Explorer''' tab. |
* Mark the reference image ''clip_ebee_ortho_align.tif'' in ToC. Right click {{mitem|text= Open RGB Image Window --> OK}}. | * Mark the reference image ''clip_ebee_ortho_align.tif'' in ToC. Right click {{mitem|text= Open RGB Image Window --> OK}}. | ||
* Mark the image to be registered ''clip_mavic_ortho_align.tif'' in ToC. Right click {{mitem|text= Open RGB Image Window --> OK}}. | * Mark the image to be registered ''clip_mavic_ortho_align.tif'' in ToC. Right click {{mitem|text= Open RGB Image Window --> OK}}. | ||
Revision as of 15:09, 5 November 2020
- Start SNAP Desktop
- File --> Open Product.... Browse for Unmanned Aerial System (UAS) ortho mosaics:
\geodata\uas\clip_ebee_ortho_align.tif is a reference image which is very well georeferenced. \geodata\uas\clip_mavic_ortho_align.tif is an image with a positional offset. It needs to be registered to the reference image. Open or drag and drop marked files from Windows File Explorer into the SNAP Product Explorer tab.
- Mark the reference image clip_ebee_ortho_align.tif in ToC. Right click Open RGB Image Window --> OK.
- Mark the image to be registered clip_mavic_ortho_align.tif in ToC. Right click Open RGB Image Window --> OK.
- Window --> Tile Vertically. Both side-by-side windows are spatially linked. Zoom in and use the Panning tool to see the offset between both images
- Mark the image to be registered clip_mavic_ortho_align.tif in ToC. Raster --> Subset --> Band Subset. Check exclusivly band_1.
- Repeat this step for band_2 and band_3 creating separated single bands of the image to be registered .
- Raster --> Geometric operations --> GeFolki Co-registration.
- Define I/O Parameters and Processing Parameters:
- Click Run.
- Repeat this step for band_2 (subset_1) and band_3 (subset_2). Adjust processing parameters for each band, accordingly.
- Create a stack of all coregistered single bands. Raster --> Geometric operations --> Collocation
- Raster --> Data Conversion --> Convert Datatype
- Check Save as and select GeoTIFF from drop downlist
- Mark the coregistered image collocate_cnv in ToC. Right click Open RGB Image Window --> OK. Check the geometric quality of the co-registration comparing clip_ebee_ortho_align.tif (bottom), clip_ebee_ortho_align.tif (middle) and collocate_cnv.tif (top).
