Timeline for DTM extraction of tree heights
Current License: CC BY-SA 3.0
8 events
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| Apr 27, 2017 at 20:24 | history | edited | PolyGeo♦ | CC BY-SA 3.0 |
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| Apr 27, 2017 at 19:41 | answer | added | Steven Kay | timeline score: 3 | |
| Apr 27, 2017 at 13:37 | comment | added | Knightshound | DSM = with land features e.g. houses trees, cars etc. DTM = terrain with all the features removed. Both are a type of DEM. The only thing I can think might work for you is using the 'Fill Sinks' tool. It's meant to be used for hydrology analysis removing sharp peaks or troughs in the landscape. But if your trees are tall/separate enough, you might be able to use the Fill Sinks product layer as a difference and deduct that from your DSM and identify the tall areas that have been removed (i.e. the trees). But as your DSM is over rough terrain you'll most likely get a lot of rubbish as well. | |
| Apr 27, 2017 at 13:29 | history | edited | Knightshound | CC BY-SA 3.0 |
Correting question details from questioners comment
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| Apr 27, 2017 at 12:47 | comment | added | Andreas | Sorry, i confused the phrases. Sure I mean a DSM. My understanding was DTM = DSM and what you mentioned as DTM equals a DEM... Anyway. I just have the DSM. As it is produced by photogrammetry I only have the DSM. Is there any way to do it without having a DTM? | |
| Apr 27, 2017 at 12:08 | comment | added | Knightshound | Are you sure its a DTM you have? as a DTM won't have tree heights. What you need is a DSM. What you actually need is both and then you deduct from the other in the raster calculator. check this answer out for better understanding: gis.stackexchange.com/a/5704/73835 | |
| Apr 27, 2017 at 11:54 | review | First posts | |||
| Apr 27, 2017 at 12:08 | |||||
| Apr 27, 2017 at 11:50 | history | asked | Andreas | CC BY-SA 3.0 |