tuananhvienngoc Posted November 4, 2011 Report Share Posted November 4, 2011 I want Reflectance at 750 nm in RSI envi for calculation "Red Edge Normalized Difference Vegetation Index (NDVI 705)" in RSI envi. Can u guide me step by step to calculate "NDVI 705" in RSI envi? Thanks, everybody. Quote Link to comment Share on other sites More sharing options...
Administrators EmperoR Posted November 5, 2011 Administrators Report Share Posted November 5, 2011 what image for your calculation? Quote Link to comment Share on other sites More sharing options...
tuananhvienngoc Posted November 5, 2011 Author Report Share Posted November 5, 2011 Landsat TM5 and Landsat ETM7 Quote Link to comment Share on other sites More sharing options...
Lurker Posted November 6, 2011 Report Share Posted November 6, 2011 750 nm is near infra red, you may see the equation of NDVI 705 here [hide] http://geol.hu/data/online_help/Vegetation_Indices.html [/hide] basically same with NDVI, but using high spectral resolution data, you need something like hyperspectral data / hyperspactral image you need band 750nm and 705 nm reflectance my two cent :wink: Quote Link to comment Share on other sites More sharing options...
tuananhvienngoc Posted November 6, 2011 Author Report Share Posted November 6, 2011 I have read your site before asking your questions. I tried to learn to count all values ??on that site. I heard only a handful of new images are all using that function. I have an example of its cork Envi same data, the result is identical to the instructions of Envi. I want to do exactly the same example with your area. Can u only do it yourself? Quote Link to comment Share on other sites More sharing options...
Lurker Posted November 6, 2011 Report Share Posted November 6, 2011 okay, based on my opinion, it need a hyperspectral image that contain band 750 and 705 nm so you CAN'T do that in landsat, if you have example data of hyperspectral data contain 750 and 705 band, its simple, just using Spectral>Vegetation Analysis>Vegetation Index Calculator IMHO Quote Link to comment Share on other sites More sharing options...
tuananhvienngoc Posted November 7, 2011 Author Report Share Posted November 7, 2011 I need to know how to have all such values ??as in Vegetation Analysis Toolkit Data: h[hide] ttp://www.ittvis.com/portals/0/tutorials/envi/39_Veg_Toolkit.zip [/hide] Guide: [hide] http://www.ittvis.com/portals/0/tutorials/envi/Vegetation_Analysis_Toolkit.pdf [/hide] I want to know how to have those values ??and make it out in ENVI. Can u guide you every step of the in ENVI? Quote Link to comment Share on other sites More sharing options...
pasfans01 Posted November 7, 2011 Report Share Posted November 7, 2011 or maybe you can use recently launched high end multispectral sensors like rapideye and worldview-2, both of them have red edge band, for the reflectance calculation in ENVI, you can use FLAASH, QUAC, or gain offset approach, details about three methods I mentioned can be found in ENVI help and ENVI user guide Quote Link to comment Share on other sites More sharing options...
Lurker Posted November 7, 2011 Report Share Posted November 7, 2011 @tuananhvienngoc thanx, I will try to solve it, just wait regards, Quote Link to comment Share on other sites More sharing options...
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