How to calculate NDVI with ArcMap 10.1

In this video I use ArcMap 10.1 with a 4 band Aerial Photo (RGBiR) to calculate the Normalized Difference Vegetation Index (NDVI), a graphical indicator that can be used to analyze remote sensing measurements to assess whether the target being observed contains live green vegetation or not. I use Spatial Analyst extension along with Raster Calculator in the Map Algebra Toolbox.

[aestfd]

thanks man, you are a life savior, because I don't know how to use ENVI. I appreciate this a lot

[sounny]

This is a great idea for my next video! What you need to do is use the reclassification tool. What you will do is go to the ArcToolbox and look in the spatial analysis toolbox for reclassify. The reclassification functions reclassify or change cell values to alternative values using a variety of methods. So what I suggest is that you reclass 0.7-0.9 to a value of 1, and the others to 0. Then with the result, look at the attribute table for a pixel count. Multiple pixel count by size for area

[sounny]

It is exactly the same product. I actually find it easier to calculate in ArcGIS. Before I used to make the NDVI in ERDAS and then bring it into ArcMap. This saves a step. ENVI also uses the same formula.

[pedrovieiracandido]

The NDVI formula considers reflectance values, so in theory you would have to convert the Digital Number (DN) to radiance then to reflectance before adding and subtracting the band values...

[IAmTheRocketMan]

Easy to follow and understand. Thank you !

[sounny]

I used to use ERDAS to do this, but I am glad I can do it with ArcMap now.

[LezanKOthman]

Thank you much... hope to see more videos from you...

[aeestay]

This video is great thank you! one question, do you know where can I get maps either aerial or not for Mexico? I`m trying to make a NDVI for the volcanoes area. Thanks!

[mohamedhassan-dxko]

the video was nice
i wonder wich one is more accurate and reliable to work with the Red Edge Normalized Difference Vegetation Index or the normal NDVI
am kind of stuck so i would really appreciate ur help

[maksimfesenko]

Can you make a video on how to use 3 bands ? because i downloaded maps from earthexplorer & glovis, and they all have 3 bands

[j.r.p.jespersen]

Great tutorial, although I can't get mine to calculate the raster properly. ArcGis don't give much of an explanation as to why. You got any idea, what might cause the calculation to malfunction?

[БексултанКанатов-юи]

Sipmly incredible tutorial!! Made of great deal out of it!! Many thanks to author!!

[knallhardt]

hey there, thank you for the lesson. its a nice explaination. is it possible to identify different kind of crops like for example potato, corn?

[nico]

Thanks for this video from Santiago of Chile!!..

[drano]

I need to combine four quadrants to for my study area. Should I mosaic them first and then do analysis, or do I need to do them individually and then mosaic. I tried mosaic them together first, but then the bands were no longer giving me an NDVI.

[sounny]

Nearly all satellite Vegetation Indices employ this difference formula to quantify the density of plant growth on the Earth — near-infrared radiation minus visible radiation divided by near-infrared radiation plus visible radiation. The result of this formula is called the Normalized Difference Vegetation Index (NDVI). If you can tell me what two formulas you are comparing perhaps we can figure out which is the best.

[aestfd]

How is your experience about it, is it too different the final product you got? I mean in the quality of it.

[essam]

Thanks for sharing this video. I use Rapideye for my imagery and I know that all vegetation indices use "Reflectance" in the NIR/Visible range to get a value. However, these bands and their values that you are using seem to show digital numbers DN (not the reflectance); this is the case for Rapideye imagery that I have just received. Therefore, one needs to convert the DN to the reflectance first before calculating NDVI for instance. Please let me know what you think. Thanks

[neerajdhingra]

Hi,
I would like to ask you, what if we have data with 3 bands instead of 4 bands. Could you please show how to work in case of 3 bands or could you share a link if you have already shown before.
Thanks!

[abeeyabiodun]

Please I need to extract the number of buildings in an urban environment am working on for my research work. Is there a way to get this done without having to count manually.