I am currently working on a project to map oil plumes in the Gulf of Mexico using MOD09GA data (MOD09GA.A2010137.h10v06.006.2015207160843 specifically) and I am confused about the actual pixel size of this data.
Taking the first pixel (x=1, y=1) as an example, the length, width and area of this pixel is 595m, 463m and 0.389km^2:
But when I import the same data into ARCGIS pro using the same coordinate system, the length, width and area of the same pixel became 463m, 463m and 0.21km^2 as shown below (sorry for the Chinese in the images):
More interestingly, when the data is under WGS 1984 the numbers changed again:
I am so confused about which one is correct, can anyone help me with this? Thank you so much!