IMPORTING RAW DATA

Session 3

Kathryn Keranen

JUST LOOKING AT IT

1. File
2. Import
3. Custom -- set 512 by 512
4. Repeat for all bands.
5. Invert
6. Enhance
   • Where is it? 34.46 N, 90.27W
   • Mississippi River???????
   • What can you see?
   • river, island
   • Is the island all dry?
   • levees
   • roads
   • meanders
   • Where is the river the fastest?
   • What do the people do? Landuse?
   • Sand
   • Flood Plains

WHY DO WE HAVE DIFFERENT BANDS?

1. Landsat has 7
2. AVHRR and GOES (4 or 5)
3. AVIRIS (220) -- hyperspectral data

SPECTRAL CURVES

1. Sensors on the space craft
2. What can light do? Reflect, Transmit, Absorb
3. Look through the filters.
4. Spectrometer

PLOT A SPECTRAL CURVE

1. water x=210 y=385
2. soil x = y=
3. vegetation x= y=

MAKING COMPOSITES

Follow instructions carefully!

1. Open images in order RGB.
2. invert
3. enhance
4. apply lut
5. stack
6. RGB
7. check dither

Make a 321, 432, 453, 742. Compare the different features that you see.

Below 321,432,743!

Session 4