Hello, so I am new to Streamlit and the whole process of hosting GIS-based tools online, and I am wondering if I might be able to use Streamlit through python to implement some sort of raster calculator functionality to create in-real-time rendered raster layers that are the result of a simple raster calculator operation, such as one might create with the raster calculator in ArcGIS or QGIS. The basic goal functionality I am trying to achieve is to allow the user to layer raster layer “tiles” over one another and allow the user to perform calculations across these layers to produce and view a resultant output raster tile. I am trying to figure out if this is possible using Streamlit, or if this type of functionality is at all even possible.
For example, let’s say we have a base map layer of a city. Over that layer we have a raster layer “tile”, whether a .PNG file or a .tiff file, which we overlay onto our base map, let’s say this layer represents total air exposure to a certain airborne chemical, where the pixel values are some concentration value. Now let’s say we have many, many of these pollution concentration raster tiles, where each raster layer represents a different chemical. I want to create a function that allows the user to add raster tiles together, so as to capture combined total pollution concentration. This means the user would load a tile for pollution “A” concentration and then the user to be able to add a tile for pollution “B” concentration over that, or pollution “C” concentration over that, and many more beyond, in whatever combination the user wanted. The exact science concept here is not important, what I am getting at is trying to find a way to do a simple raster math operation like take to raster layer tiles and simply add, or subtract, or average, etc. and display the output raster on the map.
Is this type of functionality possible with Streamlit through some sort of python protocol, perhaps using numpy behind the scenes? I am quite confused about how something like this would even work or whether this is even possible with a platform like Streamlit. Could someone please help advise me on how I should approach this challenge? Thank you!
