I have a satellite imagery. I want to vectorize all the trees at once by color sampling. How to do it?

I used Photoshop to sample the all the various color ranges of trees [Green] to distinguish between trees and built-up area. Can I use this technique as the Photoshop converted the trees in satellite image in one colour. As you can see in this image I sampled all the trees and converted to black colour to distinguish between trees and built-up area. Now can I select this color from this image and convert it to a VECTOR for Land use and Land cover map in QGIS.

Image from photoshop

  • Welcome to Geographic Information Systems! Welcome to GIS SE! We're a little different from other sites; this isn't a discussion forum but a Q&A site. Your questions should as much as possible describe not just what you want to do, but precisely what you have tried and where you are stuck trying that. Please check out our short tour for more about how the site works – Ian Turton Mar 27 at 17:38

Yes you can. You have a few options.

  1. If you have a new raster layer in which all of the trees are now colored black you could use a reclassify tool to produce a new raster such that all of the trees have a value of 1 and all of the non-tree pixels have a value of 0. Then polygonize that result. See this link for more help on reclassifying options.

  2. Have a look at the semi-automatic classification plugin in. This approach would save you a Photoshop processing step in the first place and likely retained any spatial information that was contained in the original data. https://fromgistors.blogspot.com/p/semi-automatic-classification-plugin.html

  • Yea. Thanks for the help. I found a detailed Tutorial for this Land Classification with SCP Plugin. This video should help the newbies like me youtube.com/watch?v=HKNS-wsc7lo – IRA_01 Mar 28 at 4:10
  • 1
    Hey I need some help. I have done entire experiment/calssification with SCP Plugin but after completing the entire classification I could not able to see classification tab in SCP Dock. Open the link of image of SCP Dock imgur.com/0jUoVau – IRA_01 Mar 28 at 8:26

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.