User Tools

Site Tools


wiki:exercise1

Open the Landsat image with the image viewer openev:

openev -h ${LANDSATDIR}/${LANDSATIMG}

Select different band settings (false colour images)

consult web page with landsat bands for different thematic band settings

natural (true) colour image for Landsat imagery: R=band 3(red), G=band 2 (green), B=band1 (blue)

zoom in on particular area of interest

  • method 1: + button
  • method 2: control button + drag window
  • method 3: control button + left mouse button

zoom out from particular area of interest

  • method 1: - button
  • method 2: control button + right mouse button
  • method 3: use fit all layers button (square box with arrow in each corners)

create vector with forested areas by selecting forest from cornwallnatural.shp and reprojecting to epsg:3035 (ETRS89:LAEA) <code bash> ogr2ogr -tsrs epsg:3035 -where “TYPE in ('forest')” ${VECTORDIR}/cornwallforest3035.shp ${VECTORDIR}/cornwall_natural.shp </code> open forest vector in openev on top of landsat raster image question: can you distinguish forest from other vegetated areas? question: can you easily distinguish forest from inland water? select the standard false colour composite__

standard false colour image for Landsat: R=band 4(NIR), G=band 3(red), B=band2(green)

Interesting web sites for interpreting Landsat images:

http://web.pdx.edu/~emch/ip1/bandcombinations.html

http://zulu.ssc.nasa.gov/mrsid/tutorial/Landsat%20Tutorial-V1.html

Do not forget to enhance raster when loading new bands using button with horizontal line

question: what does vegetation look like in this false colour image, why?

question: what about water and forest now?

wiki/exercise1.txt · Last modified: 2017/12/05 22:53 (external edit)