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Mastering Landsat Image Processing: Mosaicking and Filling Scan Lines

Learn how to mosaic Landsat scenes, fill scan lines, and perform supervised classification in ENVI and ArcMap. Includes tips on handling radiance, reflectance, and exporting images.

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Mastering Landsat Image Processing: Mosaicking and Filling Scan Lines

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  1. IGETT Learning Unit Lessons Learned or... OH, NOW I GETT IT! Tora Johnson UMaine at Machias GIS Lab & Service Center

  2. 1. Free GLOVIS Downloads 2. Mosaicking & Filling Landsat SLC-Off Scan Lines Tora Johnson UMaine at Machias GIS Lab & Service Center

  3. Free GLOVIS Downloads

  4. Free GLOVIS Downloads

  5. Free GLOVIS Downloads

  6. Mosaicking & Filling Landsat SLC-Off Scan Lines Goal: Supervised Classification Problems to solve before classification: Uncorrected/ Unnormalized-- Convert DN to radiance and then reflectance Scan lines-- need to fill them Different paths taken on different dates-- mosaic & preserve best data

  7. Mosaicking & Filling Landsat SLC-Off Scan Lines The Process... • In ENVI... • Convert scenes to radiance • Convert radiance to reflectance In ArcMap... • Mosaic scenes • Use adjacent scenes to fill scan lines Back in ENVI... • Supervised classification

  8. Mosaicking & Filling Landsat SLC-Off Scan Lines I use a table to organize values for each band and date...

  9. Mosaicking & Filling Landsat SLC-Off Scan Lines Radiance

  10. Mosaicking & Filling Landsat SLC-Off Scan Lines Reflectance Hint: Using the Queue function allows you to set up several band math expressions and then run them all at once while you, say,clean your oven.

  11. Mosaicking & Filling Landsat SLC-Off Scan Lines To Export an image to ArcMap, in the display box, click File > Export Image to ArcMap. Choose the instance of ArcMap or start a new instance.

  12. Mosaicking & Filling Landsat SLC-Off Scan Lines The No Data value is zero

  13. Mosaicking & Filling Landsat SLC-Off Scan Lines Scan lines are identical within a path, but different In adjacent paths

  14. Mosaicking & Filling Landsat SLC-Off Scan Lines Colored stripes are places where overlapping paths can fill each other's scan lines. Black lines are blank in both paths.

  15. Mosaicking & Filling Landsat SLC-Off Scan Lines

  16. Mosaicking & Filling Landsat SLC-Off Scan Lines Merges two scenes in the same preferred path

  17. Mosaicking & Filling Landsat SLC-Off Scan Lines Merges two scenes in the same non-preferred path

  18. ` Mosaicking & Filling Landsat SLC-Off Scan Lines Finds values in path 2 that we will use to fill gaps in path 1.

  19. Mosaicking & Filling Landsat SLC-Off Scan Lines Mosaics Path 1 & Path 2 & “Shrinks” remaining gaps

  20. Mosaicking & Filling Landsat SLC-Off Scan Lines Aesthetically, results were better if I stretched the images before mosaic, but stretch results in sometimes significant changes to pixel values.

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