I have 80 LANDSAT 8 Images. I can able to create composite image using Arcgis and then Pansharpen it to produce 15m multi-spectral image as a input for classification process. My requirement is to extract only roads vector(Polygon) data from LANDSAT 8 Images using ecognition developer. After segmentation, I have tried NDVI,NDWI ruleset in eCognition to unclassify vegetation and water areas(so that I can get road) but it doesn't seem possible to classify road data completely.

Is there any specific ruleset available for extracting roads?

I have licensed Arcgis 10.2.1, Ecognition developer 9 as of now.


As a rule of thumb using multi-spectral images with more than 30% more spatial extent than Pan image will lead to serious case of mixed pixels. This should be avoided at all cost. As is your case, this value is 50%.As such i suggest you increase resolution of the multi-spectral images. Also Landsat itself are a mid resolution images, I don't expect you to get road network of all classes. Maybe highways with 4 lanes or greater will be easily classified but that is pushing your luck too much. Best case would be to digitize it yourself.

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  • I agree. Switching to S-2A/S-2B could be an alternative for this purpose. – aldo_tapia Sep 14 '17 at 10:56
  • @overarch Yeah! Can you guide me how to extract primary roads from LANDSAT 8 scenes? – Sarath SRK Sep 16 '17 at 5:25
  • @Gis_Boy you can publish your results here then we can help you. Can't hand hold you through the entire exercise. – OverArch Sep 25 '17 at 4:35
  • I have tried in eCognition and got primary roads only.Rulesets I have used are i) NDVI to unclassify vegetation ii) NDWI to unclassify water iii) BAI and REI to get road structures and used Density parameter also. This is what I have got! Looking for better results – Sarath SRK Sep 26 '17 at 4:14
  • @aldo_tapia I have checked S2A 10m resolution Image It gives result as same as LANDSAT – Sarath SRK Sep 26 '17 at 4:20

you should also try textural information for extracting roads, when editing the NN feature space

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  • I dont understand, Could you explain bit clear? – Sarath SRK Sep 16 '17 at 5:24

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