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Coastal change Danube Delta change detectionOil spillsDeforestation Bardia National ParkCongo River BasinKameng-Sonitpur Elephant ReserveKilimanjaroRondoniaShillong and GuwahatiIce Antarctica 2003Climate change and glaciersGlacier analysis using radar imageryGlacial retreat in the AlpsGlacier Ice FlowMonitoring of glaciers in the HimalayasRemote sensing of ice and snowUrbanisation CairoCity of KathmanduCórdobaHimalayasKathmandu ValleyLagosVegetation Annapurna Conservation AreaLost in the AndesNgorongoro Conservation AreaNiger Inland DeltaVegetation in South America
| | | | | | | Bardia Region Overview - Image processing - Part 6
This exercise is divided into eight parts and requires the use of LEOWorks.
Transparent Overlay
The classified image 'Bardia_Landsat_2002_unsup.tif' still has widespread colours. There are many tiny objects that are difficult to distinguish. Contours are useful for a better differentiation of such small objects. Furthermore, contours allow magnification without the disadvantage of the elements becoming blurred. Depending on the requirements, the contours are generated from different images.
Example of a transparent overlay
To specify the water surface, for example, the use of an infrared image is reasonable.
Open the 'Bardia_Landsat_2002_Band_4.tif' image
Click 'Bardia_landsat_2002_band_4.tif'. Choose Enhance>Filter>Find Edges>Sobel....
And then Image>Invert....The image will change into a line drawing. Save the image as 'Bardia_landsat_2002_contour_4.tif' in the 'Bardia' folder.
Open the 'Bardia_Landsat_2002_unsup.tif' image and convert it to RGB.
Choose Image>Convert to...>Red Green Blue.
Choose Image>Transparent Overlay. Select the contour image 'Bardia_landsat_2002_contour_4.tif' as Background Image and the classified image 'Bardia_Landsat_2002_unsup.tif' as Foreground Image, and use 50% for the opacity.
1. Which classes are framed by polygons?
2. Are the previously described land use classes more visible? If so, what could the reason for that be?
3. Compare the unsupervised classification result with the transparent overlay and assess their usefulness as a thematic map. What is the add-on with the transparent overlay?
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| | Bardia National Park IntroductionLocationGeology and soilWeather and climatePeople and settlementsExercises Worksheet introductionOverview - working on paper printsBardia Region Overview - Image processingLandscape and land cover dynamics in the Karnali FloodplainHabitat suitability evaluation for rhinoceros in BardiaEduspace - Software LEOWorks 3ArcExplorerEduspace - Download bardia.zipbardia_paperprints.zipResources Useful links
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