I have downloaded 3 satellite images (Landsat 8 OLI TC1P), in three different periods (two images are from Mart 4. 2017. and the one is from Mart 20. 2017). I have joined (made mosaic) them in ENVI and have got this- 3 satellite images joined

You see the overlapping lines. Next, I have obtained NDVI in Arc Map and got this- NDVI image made from 3 satellite images

You see the inappropriate values in marked part of the image.

Do you know how to manage this problem?

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