Remote Sensing and GIS Application Lecturer Ruba Yousif
Remote Sensing and GIS Application Lecturer Ruba Yousif Hussain Third Year 1
Remote Sensing and GIS Application Third Year Lecturer Ruba Yousif Hussain Band Combination Laboratory Band Combination Purpose Using different band combinations to display scene allows to see different features within a scene and become more familiar with the scene to identify urban areas , forests , agriculture , and water bodies. Application Arc. GIS Tutorial Creating Different Band Combinations Right click on composite image in the Table of Contents , then click Properties. 2
Remote Sensing and GIS Application Third Year Lecturer Ruba Yousif Hussain Click on Symbology Each band has a range of brightness values. Click on Histograms button. Arc. Map displays the histograms for each band displayed in the red , green , or blue channels. These are frequency histograms which plot the value of the digital numbers ( DNs ) ( xaxis ) against the number of pixels with that value ( y-axis ). It shows the minimum DN value , and the maximum , mean , and standard deviation. 3
Remote Sensing and GIS Application Third Year Lecturer Ruba Yousif Hussain 4
Remote Sensing and GIS Application Third Year Lecturer Ruba Yousif Hussain Why would each histogram look different ? Answer because each band has a different range of DNs. The image that is displayed in the map document window does not look very natural. Why ? Answer because Arc. Map is displaying the blue band as red and the red band as blue. It can change the display strategy to make it look more natural. Try Channel Red Green Blue Band 3 Band 2 Band 1 5
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