How can we extract digital elevation data from Google Earth?

Hello everyone. I am trying to calculate some vegetation indices and crop coefficients using Sentinel 2 satellite data in ESA SNAP software. I calculated NDVI, SAVI. LAI in software but I didn't find the solution to calculate Kd (crop density coefficient) and Kcb (Basal crop coefficient). I calculated them manually using QGIS software, but it takes time. If anyone knows something about ESA SNAP and these coefficients, please let me know.

If you have an area of several 25's of acres (several 100,000 m²) and your only source of GNSS Information is that of the drone, can there be distortion of the 3D Model / orthomosaic that are so large that calculations based on this model cannot be trusted?

In other words: Do GCPs not only add global georeferenced accuracy, but also decrease the error of the scale of the result (for example if you want to measure landfill, the surface area or the volume of some rocks or debris) ?

How do i calculate Land Surface Temperature Landsat 8 level 2 image?

Do I have to convert DN (TOA) to radiance, then convert radiance to brightness temperature, then emissivity, and finally the LST calculation?

OR is it enough to rescale the thermal bands and convert kelvin to celsius degrees (since level 2 is already corrected)?

can I use this formula ? LST=BT/1+w*(BT/p)*In(e)

in which way we can obtain BT? and e for this kind of data?

I used this formula for calculating surface temperature in kelvin by "0.00341802 * DN + 149.0"

I am looking for observed rainfall data in different regions, such as the USA or Europe or Africa or China.

I will be thankful for any kind of help.

I have a drainage network polyline feature the course of which is structurally controlled. To determine the dominant direction trends of the streams I need to plot a rose diagram. However, I am unable to derive directions of these polylines. There are 3500+ streams present in my AOI.

is it possible to identify the regulation or what is the probability that the river flow is regulated, based on only observed streamflow data and/or meteorological data such as precipitation?

If you could suggest any methods/equations or articles that could help me determine the percentage/probability of regulation in river flows using only observed river flow data, then it would be a great help.

Thanks.

Where can I download 10m resolution Digital Elevation Model (DEM) data for Morocco?

I am looking for a website to download magnetic data for geothermal exploration.