I want to identify river courses from natural earth/ aerial imagery. Is there a an automated way of doing this.
I wont be using NIR, IR bands of landsat
Yes you can do that. Object based feature extraction may be used for automatic feature capturing from the satellite data. A number of studies have been conducted in this line, you can refer those.
Yes you can. What image do you have? Depending on what spatial resolution you have, you can map water bodies with as much detail.
you can try Object Based Image Analsis (OBIA)
https://www.youtube.com/watch?v=PatMAWiV71M
http://www.sciencedirect.com/science/article/pii/S0924271609000884
http://www.isprs.org/proceedings/XXXVI/4-C42/Papers/01_Opening%20Session/OBIA2006_Hay_Castilla.pdf
http://ac.inf.elte.hu/Vol_037_2012/103_37.pdf
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