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2013-04-30 00:32:24 -0500 commented answer Calculating the area of selected parts in an aerial image

thanks a lot!!!!!!!!

2013-04-30 00:32:06 -0500 received badge  Scholar (source)
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2013-04-29 11:58:42 -0500 commented answer object identification in aerial image
2013-04-29 11:40:47 -0500 commented answer Calculating the area of selected parts in an aerial image

if i do relative area i would be better of expressing the area in terms of percentage right??

2013-04-29 03:48:16 -0500 received badge  Student (source)
2013-04-29 02:20:46 -0500 commented answer Calculating the area of selected parts in an aerial image

not the same person, how will i be able to obtain the area without any scaling reference

2013-04-29 01:50:49 -0500 received badge  Editor (source)
2013-04-29 01:48:33 -0500 asked a question Calculating the area of selected parts in an aerial image

i am trying to calculate the area of vegetation in aerial image, i don't have the information regarding the height at which the image is taken. i have extracted vegetation in the image by using RGB values, the rest of the image i have set it to a pixel value 0(i.e black). how do i proceed from this step. please help. thank you image description