ArcGIS Pro - Reclassifying Raster Data

This is the walkthrough for Lab Six, Part C, of the UMass - Amherst Introduction to GIS course (NRC 585 and cross lists)

[@bruinshockey199]

Thank you Forrest, helped me out a lot.

[@koenraadhendricus]

Thanks! Clear to the point, good articulation and clearness of voice

[@janini1232]

Thanks a lot! I'm doing my bachelor's thesis currently, this was helpful. I didn't have my data "symbolized" like in the video and so the classes didn't show up automatically, but clicking on "classify" allowed my to define how many classes and with which margins I wanted. (Just saying this in case anyone has the same issue). Easier than I thought!

[@FreelanceGeographer]

A helpful note! Thank you.

[@lavender_coast]

Thank you very much!

[@Eng_world]

I have classified NDBI into a Built-up area and non Built-up area. Over my study area there is a multiple municipality. So how can I change the raster value ie Built-up area raster value by population and each municipality has different population. Is there any way to solve this problem. One way is by clip the raster by features and reclassify. But I want whole study area.

[@FreelanceGeographer]

If you wanted to incorporate some kind of population weight with your NDBI, you could use a raster population dataset like the Gridded Population of the World: sedac.ciesin.columbia.edu/data/collection/gpw-v4. Using some kind of raster calculation, you could devise a way to add in population numbers with your NDBI calculation. Good luck!

[@zemachzewdiekebede727]

interesting

[@etaokoafolabi6634]

How do i reclassify raster data in RGB?

[@FreelanceGeographer]

RGB raster data is often multiple bands of rasters displayed together. You would likely need to extract the individual bands from the Raster (see: pro.arcgis.com/en/pro-app/latest/help/analysis/raster-functions/extract-bands-function.htm) and then reclassify the single band you're interested in reclassifying. Then you could use composite bands (see: pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/composite-bands.htm) to bring them back together! Be careful though - each of those RGB bands has a specific value as it was collected that way - you should have a good reason to change them!

[@earl12121]

Hey, is there a way of reclassifying unique values? I'm trying to combine two classes of landcover, but the output only results in one class showing. Thanks

[@FreelanceGeographer]

Depends a bit on what you mean. Say you have two landcover values (1 and 2): you could reclassify them together by using the tool to turn them both to 1, or 2, or to a new value (say 3). If you have a lot of values, (say 1, 2, 3, 4, 5) and are just trying to condense two while keeping the rest, you could just set all the values you don't want to change to be the same value, and condense the ones you want to be the same value. Reclassify can work by just turning values into the same value!

[@earl12121]

@@FreelanceGeographer thanks for that, I was trying that before and it kept getting the dreaded 9999 error but finally worked.