I created NDVI from SPOT XS image using Envi remote sensing software. When the image is opened in Arcmap, the value field became spectral values ranges from 0 to 255. I need the original NDVI values in Arcmap.
You shouldn't have saved it as image from "Save image as"; instead you should save it by: File>>Save File as>>TIF,GEOTIF
Good luck
Did you stored the NDVI image in tif format in ENVI ? In that case, you should get the NDVI values in ArcMap.
You shouldn't have saved it as image from "Save image as"; instead you should save it by: File>>Save File as>>TIF,GEOTIF
Good luck
That is right guys if it is saved as Geotiff /Tiff you should have the NDVi values.
Yes Kapoi, I used the regression equation depending on random samples of the DN, and the correlation coefficient was 99% mainly for the positive ndvi values. But it did not work for the negative ones properly
Ahmed. please this could have been interfered by the format you saved in, you can probably save in the same format the data is represented and try to import it in arcmap.
In short, from the original NDVI data (in floating point format) you have obtained data coded in 8-bit unsigned integer format. The new values have nothing to do with the "spectral" characteristics of satellite data. It is only a mathematical problem, caused by how data are internally coded in the computer; that is, it is a problem of "data type", that could be solve based on the two programs documentation.
I saved it as Geo/tiff but still giving me spectral values in Arcmap!!!!!!!!!!!
In this regard, i understand you, please try and work with one software on this now, preferably arcmap throughout you data processing and see if this will occur again
Thanks for all, the problem is solved as you recommended. There was a problem with the image itself.
The NDVI image has different cursor values and data values in ENVI
Dear Ahmed,
Your question is quite helpful for me. How did you solve the problem of your image in the end?
I have come to the same issue of my NDVI image. The cursor values in ENVI are between -1 and 1. But the data values (pixel values) are different as shown in the statistics below (by ENVI 5.1: Compute Statistics).
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Basic Stats Min Max Mean Stdev
Band 1 -767.369324 1128.498535 0.538817 0.959001
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Also, when the image is opened in ArcMap, the original NDVI values didn't show up. But the cursor values is still correct (please see the attached ArcMap capture). Would you like to give me some hints to solve this problem? Thank you very much.
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