I want to create application map for agriculture based on NDVI map. I have theoretical way how to do it.
My raster has two values (1 - red, 0 - green), the raster is quite big (100 hectares with 6 mm pixel size).
I need to create polygons which contains all the red pixels (as on the picture) - ideally with some buffer. Result should be shapefile (so Raster to Polygon) with maximum number of 50 000 polygons, so I need to generalize polygons and merge to achieve smaller amount and shorter computation time.
Polygonize often use big amount of time. I also tried make just worse resolution, it works quite well, BUT I need that the new pixel (for example 1 m resolution) need to be red even if only one former pixel was red. Any red place can't disappear. Best would be if I don't have to polygonize it first because of waste of time, but generalize and merge it first and then polygonize.
In QGIS or ArcGIS.