Timeline for Polygonize vegetation area from Landsat7 RGB using QGis / Bilko?
Current License: CC BY-SA 3.0
13 events
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| Apr 13, 2017 at 12:34 | history | edited | CommunityBot |
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| Jan 21, 2014 at 8:09 | vote | accept | Elena Wimmerwuchs | ||
| Jan 21, 2014 at 8:08 | answer | added | Elena Wimmerwuchs | timeline score: 0 | |
| Jan 20, 2014 at 7:54 | answer | added | andehhh | timeline score: 1 | |
| Jan 19, 2014 at 20:56 | answer | added | WAF | timeline score: 0 | |
| Jan 19, 2013 at 0:53 | comment | added | Elena Wimmerwuchs | Thanks a lot. It's not for my own interest - it's a study on bird habitat which I'm doing during an internship, so I'm examining an area of approximately 44.000 ha only once. I'm looking for the easiest and fastest way to do this, since I have only scarce internet access and a lot more to do. I will try to get the complete landsat file. However, again: do I have to download GRASS or does this work with the SEXTANTE plugin in QGIS? (I can work with Apple or WindowsXP). | |
| Jan 17, 2013 at 10:46 | comment | added | Willy | You will likely want the complete original landsat file which has all the bands included. It comes in a packaged file with the suffix tar.gz, so if you have got that you are on the right track. | |
| Jan 17, 2013 at 10:39 | comment | added | Willy | What standard are you trying to work to? Is it for your own interest just once, or will it be a series of measurements over time (which is the opportunity with the Landsat satellites) to estimate change. High quality analysis can be done with the modules in GRASS, these run natively in linux and I got them to work reliably in GRASS 7 on Win7. I would recommend you use i.landsat.toar and i.landsat.acca before you calculate NDVI, however that is a level of complexity which may waste your time. | |
| Jan 16, 2013 at 19:32 | comment | added | Elena Wimmerwuchs | And I don't have an image with a fourth band... will it work without that? (I believe I have an image with 3 bands, red-green-blue - only these show in the property dialog: channel red = band 1, green = band 2, blue = band3). | |
| Jan 16, 2013 at 19:10 | comment | added | Elena Wimmerwuchs | I had found that threat before and looked through the links. They're saying to use GRASS GIS - can I use the SEXTANTE-plugin, where GRASS GIS-commands are included? | |
| Jan 16, 2013 at 18:54 | comment | added | artwork21 | Ideally, you want an image that has a fourth band (NIR) to pull vegetation out. I asked a similar question to yours before regarding using QGIS and feature extraction, see link below: gis.stackexchange.com/questions/9397/… | |
| Jan 16, 2013 at 17:58 | history | edited | Brad Nesom | CC BY-SA 3.0 |
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| Jan 16, 2013 at 17:03 | history | asked | Elena Wimmerwuchs | CC BY-SA 3.0 |