Question: landsat-c2-l2 scaling & NDVI

Hi,

I was going through the landsat-c2-example.ipynb notebook and noticed that the NDVI is calculated directly from the red and nir08 bands as loaded via odc.stac - without applying the documented scale and offset.
My understanding of odc.stac is that it does not apply scaling by default, so the computation as in the example notebook seems to be using the raw integer DNs. Doesn't this bias the NDVI? Is there a specific reason why the example computes NDVI on the unscaled data - or have I misunderstood anything?

Thank you for providing and maintaining these examples, they've been super helpful for getting familiar with MPC!

Best
Maike

打开 datasets/landsat-c2/landsat-c2-example.ipynb，检查 odc.stac 在计算 NDVI 之前如何加载 red 和 nir08 波段。将该计算与文档中说明的 scale 和 offset 进行比较，然后明确当前行为的原因，或更新示例，使 notebook 的 NDVI 计算正确。