Like all spatial data, rasters have uncertainty. However, it's easy to forget that the pixels in a raster one represent a small amount of what is going on inside the area the pixel represents on the ground. This is called "Pixel Mixing". Also, pixels are typically created with cameras that blur the pixels a bit so each pixel contains data from surrounding pixels. This reduces the effective resolution of the raster.
The image below is a 1 meter NAIP image of part of HSU.
The same image at 10 meters would be coarser resolution and the resulting pixels will be "mixing" their content:
A 30 meter LandSat image would have "mixed" the data together, losing the details:
At 250 meters for MODIS, we have only four pixels for the enter area in the first image. This does not mean that we should not use MODIS, we use MODIS when we need high temporal resolution and NAIP when we need high spatial resolution.
Watch the video below to learn more.
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