IGETT Learning Unit Lessons Learned or... OH, NOW I GETT IT!

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

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

Free GLOVIS Downloads

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

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

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

Mosaicking & Filling Landsat SLC-Off Scan Lines Radiance

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.

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.

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

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

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.

Mosaicking & Filling Landsat SLC-Off Scan Lines

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

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

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

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

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.

IGETT Learning Unit Lessons Learned or... OH, NOW I GETT IT!

IGETT Learning Unit Lessons Learned or... OH, NOW I GETT IT!

Presentation Transcript

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