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NDVI and LAI theory questions
By mobgis,
I'm new to remote sensing and am trying to get my head around it all so apologies in advance for the noob questions.
I've been playing around on envi and have produced some NDVI and LAI images- they look exactly the same but the value ranges are different what is the reason for this? Furthermore is anyone able to explain their relationship to me in easy to understand terms? (eg when LAI increases why does NDVI increase?
Thanks
how to calculate the ndvi % greater than 0.5 in a particular zone and also cloud percentage
By chandrakant,
down votefavorite i have a problem whem i am working to calculate the ndvi from landsat sattellite of rainy season i have assumed the pixel value above 15000 are clouds and calculate NDVI.then i am assigning the clouds pixel in ndvi 1. The main question is how to calculate zonal min max value of ndvi and percentage of cloud and percentage of ndvi greater than 0.5 in a particular zone.(zone are the vilage boundary of District). please help to solve this problem in ar
Photogrammetry experiences with gopro Hero4 black edition cameras?
By AS,
Hello everybody,
I want to know if someone has some experiences with low cost gopro Hero 4 black edition cameras for photogrammetry? I want to install the system in a remote place (Cordillera of the Andes, Bolivia). The project will consist to take a stereo pair each day for a year to measure the growing plants in an area of 1 square meter (precision of 1-2 cms)...
If someone have some experiences and can share it with me, I will be very grateful...
Thanks,
Alvaro
International Congress of the earth, space and clean energy
Free GIS apps?
By GISmo,
I searched GIS in the apple app store and received a never ending list of free GIS apps, all of which seemed very similar.
Are some better than others?
Are any of them actually "free" are do they have hidden costs associated with them?
What advantages would you get with a paid GIS app?
Any advice would be greatly appreciated!
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