| 19 Nov 2008 01:29 AM |
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So my firts post in this part of the forum... Im currently engaged in a work concerning alos palsar images. These are in a stack form and are georeferenced and processed for errors. What i want to do is to take a stack of images and detect changes in the landscape over time. I have a set of vectors containing clear cuts that i want to compare againt the raster.
basically compare the clear cut date against the change in spectral reflectance before and after that point in time on the area that the polygons cover. any ideas how this can be coded? this is my final thesis work on the swedish university of agricultural sciences and currently no one here is that familiar with either idl or envi to my great regret...
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Deleted User
New Member
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| 26 Nov 2008 03:13 AM |
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60+ views and no one has any input? surely someone should have done something similar, looking over time how spectral values or whatever changes trough a time set series of images ? Any input welcome! :)
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MariM
Veteran Member
Posts:2396 
| 26 Nov 2008 08:17 AM |
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When you say you have 'a set of vectors containing clear cuts' do you mean you have vectors that outline clear cut areas over your images? If so, you might wish to subset your images by these vector areas using Basic Tools ->Resize Data and use the vector file as a spatial subset. Then use Spectral->Spear Tools->Change Detection. There are 2 routines that will help you find areas of change - PCA and Subtractive. The subtraction method should give you an idea of change in spectral response between 2 dates.
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Deleted User
New Member
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| 28 Nov 2008 05:01 AM |
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Yes they outline clear cut areas... sorry for thinking that was obvious. Ok but since the dataset of images is kinda large and there are several versions of different modes (fbs, fbd and plr) i want to make it automated... thats why im asking if anyone has done anything similar and maybe want to share some code with me to make this possible (and a bit easier for me i guess)
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