I’ve succeeded in getting the landsat data in, in creating an NDVI composite band and visualization on the map. My problem….I can’t seem to figure out how to extract an attribute table so I can sort/use the raster calculator/summarize/etc. I tried making the NDVI a layer, raster to geodatabase, zonal statistics to table…all sorts of the tools I barely understand. ;P Any suggestions on how to turn a raster into something with attributes or a table you can open/sort/etc? I hit this before and think I solved it then, but have NO recollection of how. This is an area I’ve struggled with repeatedly, so clearly I’m not getting it. Google hasn’t helped me much.
Response: Seems like there’s an issue with the NDVI data. Did you download the July 2017 scene? Are you using the Near infrared and red bands for the calculation?
Lab Portal Connection
I’m trying to compute the NDVI and the raster analysis button is unavailable to me. It says it can’t be run because it has to be connected to a portal with raster analysis rools. The top right corner shows I am logged in, so I found some ArcGIS Pro help instructions that directed me to the portal section of the project tab, where I need to enter the URL of the portal. I have no idea what that is or how to find it, why this happened or how to prevent it in the future.
Response: You want to use Raster Functions to compute NDVI, not Raster Analysis. See the attached image below. You’re on the correct tool bar, just need to move a few buttons to the right.
I was surprised by some of the answers in the knowledge check to the band combination codes. From checking online resources, it seemed like Landsat 8 has many different combinations, and none matched the correct answers for the knowledge check. Is there a better resource for looking up band combinations? Seems there are so many, it would be great to know where to look. The only thing I can think is that the knowledge check was asking about Landsat 7?? Here’s one of the more reputable sources I thought I found:
Response: That is a great resource for understanding Landsat bands. The questions about band combinations were asking aerial imagery, not satellite imagery. Apologies if the question was not clear / I did not make a distinction between the two. Think aerial photography (from a plane, drone, hot air balloon) v satellite imagery (collected from space by a sensor in orbit). The sensors employed are different, and so too are the “bands” of information they collect.