exploring NICFI planet imagery

using high resolution data

Question 1

Copy and paste the code below in the code editor and inspect the image

var img = ee.Image("projects/cemis-camp/assets/Planet/201612");

Map.addLayer(img,{min:0,max:3000,bands:"b3,b2,b1"},"planet image")

Try to answer the following questions:

  1. is this a true or false color image
  2. what is the spatial resolution of the image
  3. when was the image obtained?

Question 2

Copy and paste the code below in the code editor and inspect the imagery

var img2016 = ee.Image("projects/cemis-camp/assets/Planet/201612");

Map.addLayer(img2016,{min:0,max:3000,bands:"b3,b2,b1"},"planet image 2016")

var img2021 = ee.Image("projects/cemis-camp/assets/Planet/202102");

Map.addLayer(img2021,{min:0,max:3000,bands:"b3,b2,b1"},"planet image 2021")

Try to answer the following questions:

  1. When was the second satellite image obtained?
  2. What are the most noticable changes between the two images?

Question 3

Copy and paste the code below in the code editor and inspect the imagery

var img2021 = ee.Image("projects/cemis-camp/assets/Planet/202102");

var ndvi = img2021.normalizedDifference(["b4","b3"])
Map.addLayer(img2021,{min:0,max:3000,bands:"b3,b2,b1"},"planet image 2021")
Map.addLayer(ndvi,{min:0,max:1,palette:"blue,red,orange,yellow,green,darkgreen"},"ndvi")

Try to answer the following questions:

  1. What index was calculated?
  2. What could we use this information for?

Question 4

Copy and paste the code below in the code editor and inspect the imagery

var img2021 = ee.Image("projects/cemis-camp/assets/Planet/202010");

var ndwi = img2021.normalizedDifference(["b2","b4"])
Map.addLayer(img2021,{min:0,max:3000,bands:"b3,b2,b1"},"planet image oct 2020")
Map.addLayer(ndwi,{min:-1,max:0,palette:"darkgreen,green,white,darkblue,purple"},"ndwi")

Try to answer the following questions:

  1. what do you observe from the planet image?
  2. what do you observe for the ndwi?

Question 5

Copy and paste the code below in the code editor and inspect the imagery

var viirs = ee.Image("NOAA/VIIRS/001/VNP09GA/2021_02_03");
print(viirs);
Map.addLayer(viirs,{min:0,max:3000,bands:"M5,M4,M3"},"viirs");

var l8 = ee.Image("LANDSAT/LC08/C01/T1_SR/LC08_126052_20210115");
print(l8);
Map.addLayer(l8,{min:0,max:3000,bands:"B4,B3,B2"},"landsat 8");

var s2 = ee.Image("COPERNICUS/S2/20210204T031929_20210204T033434_T48PVT");
print(s2);
Map.addLayer(s2,{min:0,max:3000,bands:"B4,B3,B2"},"sentinel 2");

var img2021 = ee.Image("projects/cemis-camp/assets/Planet/202102");
print(img2021);
Map.addLayer(img2021,{min:0,max:3000,bands:"b3,b2,b1"},"planet image feb 2021");

Try to answer the following questions:

  1. What are the different sensors used and what is their spatial resolution
  2. why does the sentinel 2 image look different?
  3. why is the coverage of VIIRS different than the other satellites?

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