sacridini / geet

Google Earth Engine Toolbox - Library to write small EE apps or big/complex apps with a lot less code.

Hi 👋

I'm Eduardo from Rio de Janeiro, currently living in Berlin. I'm a Postdoctural Scientist at the Conservation Biogeography Lab at Humboldt-Universität zu Berlin.

Ex. Coordinator of Data Science at the International Institute for Sustainability.

Feel free to contact/connect on Twitter, Linkedin or email

Personal website: https://sacridini.github.io/
Researchgate profile

geet's Issues

Scaling factor for Sentinel 2 imagery

Just a heads up about some indices for Sentinel 2 data (both surface reflecteance and TOA)

Since they need to be scaled by a factor of 10000.

More details in here

So...for example the EVI index should be:

'2.5 * ((NIR - RED) / (NIR + 6 * RED - 7.5 * BLUE + 10000))'

instead of

'2.5 * ((NIR - RED) / (NIR + 6 * RED - 7.5 * BLUE + 1))'

in order to get sensible values

Cheers,

Mario

surface_temperature_tm for Landsat 7

Looks like your function works for LST for Landsat 5, but is there a function to calculate LST for Landsat 7?

Please help.

depricated code

https://groups.google.com/g/google-earthengine-announce/c/rCu4FP_Cn08/m/DqC192X9BAAJ
Classifier.cart -> Classifier.smileCart
Please change accordingly.

map over image collection

If possible, could you please show how to map the function geet.sentinel2_indices over a ee.ImageCollection ?

Error in value for p (line 3403)?

The value of p (rho) is declared as 14380. The value in the cited reference (and others) is 1.438 x 10^-2 (0.01438) - a million times smaller. This seems like too big an error to have slipped by, so I'm probably missing something.

Land Surface Temperature does not seem to be working

I have been trying to calculate land surface temp for landsat 8. I have was able to add all the band without error. When I try to map the LST band I just get a solid blue box. I am not sure if this is an error or if I am missing something.

var geet = require('users/elacerda/geet:geet'); 

 var image2 = ee.Image(
  l82.filterBounds(point)
    .filterDate('2018-07-01', '2018-7-31')
    .sort('CLOUD_COVER')
    .first()
);
var new_toa_radiance = geet.toa_radiance(image2, 10);
var brightness_temp_img = geet.brightness_temp_l8c(new_toa_radiance, true);
var l8_ndvi = geet.ndvi_l8(brightness_temp_img); 
var img_pv = geet.prop_veg(l8_ndvi);
var lse = geet.surface_emissivity(img_pv);
var surfTemp_img = geet.surface_temperature_oli(lse);
var im = surfTemp_img.select("LST");
print(im);
Map.addLayer(im, {palette: ['blue', 'green', 'red']});

Error with roi.geometry

Dear @sacridini , firstly, congratulations on the amazing tool that did you create!

I've a problem using the function max(), when I use it in my script, the error message is shown:

"roi.geometry is not a function
in max(), line 1525
..."

I'm declaring in the function only the image and the scale, like this:
var geet = require('users/elacerda/geet:geet'); var img_max = geet.min(SAR_linear,{scale:10});

If you want, follows the link to my code: https://code.earthengine.google.com/cfcf6616ff698e3fdd812377669e33e4

Thank you!