Timeline for How to deal with minus values on canopy height model?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Dec 8, 2019 at 0:21 | comment | added | JRR | @bcresearcher Open a new question with images and reproducible code. | |
| Dec 8, 2019 at 0:16 | comment | added | Aaron♦ |
@bcresearcher Just a guess, but try a different spatial interpolation function (i.e. other than tin()) in lasnormalize().
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| Dec 7, 2019 at 23:34 | comment | added | bcresearcher | @Aaron thanks a lot. My chm model has a lot of pits and I wanted to get rid of them. Therefore I used pit-free algorithm introduced by Khosravipour et al. (2014). The chm that I see now surrounded by triangular spahes. Is that an error? I could not get it. | |
| Dec 7, 2019 at 23:24 | comment | added | Aaron♦ | @bcresearcher Triangles? | |
| Dec 7, 2019 at 23:22 | comment | added | bcresearcher | Thanks a lot for your answers. I used the pit-free algorithm and used chm = grid_canopy(filtered, res=0.5, pitfree(c(0,2,5,10,15), c(0, 1.5))) at the final step. But I have too much triangles on my chm model now :( | |
| Dec 7, 2019 at 23:19 | history | edited | Aaron♦ | CC BY-SA 4.0 |
added 1 character in body
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| Dec 7, 2019 at 23:11 | comment | added | Aaron♦ | Thanks @JRR, I have edited the answer based on your comment. | |
| Dec 7, 2019 at 23:10 | history | edited | Aaron♦ | CC BY-SA 4.0 |
Fixed answer base on comments
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| Dec 7, 2019 at 22:39 | comment | added | JRR | I do not necessarily agree with you. If you remove point below 2 you will have empty areas in your CHM for canopy gaps instead of zeros or values close to 0. Worst with a tin-based method you could fill the gap with irrelevant values. It can makes sense, or not depending on the method used and depending on what you want to do with your CHM. | |
| Dec 7, 2019 at 21:27 | history | edited | Aaron♦ | CC BY-SA 4.0 |
Fixed figure
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| Dec 7, 2019 at 21:17 | history | edited | Aaron♦ | CC BY-SA 4.0 |
added 200 characters in body
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| Dec 7, 2019 at 21:02 | history | answered | Aaron♦ | CC BY-SA 4.0 |