Land Surface Temperature | Calculate LST in QGIS

Рет қаралды 7,735

Dawn Of Geospatial World

Күн бұрын

Пікірлер: 48

@HemanthRSGIS 3 ай бұрын

Ma'am for Min NDVI values is negative but in the PV formula you taken as positive value instead of (-0.172219)

@dawnofgeospatialworld 3 ай бұрын

two negative signs makes one positive sign. (if we minus any negative value then, '- ' + '-' = +)

@АртурГолятин 2 ай бұрын

@@dawnofgeospatialworld at 4:59 shouldnt it be like: ( ( NDVI - ( - 0.172219 ) / ( 0.619821 - ( -0.172219 ) ) ) thus ( ( NDVI + 0.172219 ) / ( 0.619821 + 0.172219 ) ) Doublechecking myself by this example: kzbin.info/www/bejne/rZa8eGSZZtWFiZo

@dawnofgeospatialworld 2 ай бұрын

@@АртурГолятин when two minus signs come then it becomes plus sign

@diywithfabiha 2 ай бұрын

Make a tutorial on future prediction of LST map

@КонстантинДерейко 9 ай бұрын

Thank you so much!

@dawnofgeospatialworld 9 ай бұрын

We are happy to help you!

@ajaydowney 7 ай бұрын

more useful thank you

@dawnofgeospatialworld 7 ай бұрын

You are welcome

@thoduosapriina4750 2 күн бұрын

how can we calculate LST using SCP?

@نذيرصلاحالدينأيوب 2 ай бұрын

Please, does the procedure of LST retrieval require preprocessing for the thermal band?

@dawnofgeospatialworld 2 ай бұрын

@FutureBureaucrats100 10 ай бұрын

❤

@ferrellananda Ай бұрын

Do we need to do atmospheric correction with SCP plugin before doing this calculations or no?

@dawnofgeospatialworld Ай бұрын

Yes, Atmospheric correction is needed

@ferrellananda Ай бұрын

@@dawnofgeospatialworld but i see you use images without the “RT” in front of the filename (which indicates that no atmospheric correction is done). Does the landsat file in this video go through atmospheric corrections? If yes, can you show me how? Thank you

@dawnofgeospatialworld Ай бұрын

@@ferrellananda Follow the step 1 (Top of Atmosphere)

@dawnofgeospatialworld Ай бұрын

@@ferrellananda You can check this video also, kzbin.info/www/bejne/i57bm3WtfLBobMksi=Z72NKBSgNgfeQjar

@DorothyKB 3 ай бұрын

Hi! thank you, very helpful :) do you have a scholarly source for the method you've used in this video that you could link here?

@dawnofgeospatialworld 3 ай бұрын

This is a general method. You can search articles in google scholar.

@ThwmasSt Ай бұрын

we to use this method? if we donwload and extract thermal data from ERA 5 or Nasa is it the same?

@dawnofgeospatialworld Ай бұрын

Maybe data will be little bit changed

@piratad.8bits788 3 ай бұрын

Is this methodology based on research? If so, can you tell me the name of the article?

@dawnofgeospatialworld 3 ай бұрын

This is the general methodology for calculating LST from Landsat 8-9 images

@jezekielrestar7935 6 ай бұрын

Hello, my value of radiance_add_band for landsat 7 is -0.06709, should i still use the negative sign or ignore it?

@dawnofgeospatialworld 6 ай бұрын

Yes, Use the negative sign

@homenborah9077 2 ай бұрын

Ma'am is it same for landsat 4,5 data

@dawnofgeospatialworld 2 ай бұрын

For Landsat 5/7 : kzbin.info/www/bejne/i57bm3WtfLBobMk

@jayitamukherjee5533 6 ай бұрын

What would be the LST formula for Landsat 5 TM sensor?

@dawnofgeospatialworld 6 ай бұрын

The process will be same. Just check the band numbers for Landsat 5. like Thermal band of L5 is B6. In the LST calculation formula, put 11.45 for w value (10.8*BT/14388)

@methylsalicylate7531 9 ай бұрын

at 6:17 if I use landsat9 do I still have to use 10.8 for wavelength?

@dawnofgeospatialworld 9 ай бұрын

Yes You can use 10.8 for Landsat 8 & 9

@rayjaybalderama3443 9 ай бұрын

can it be used for water temperature?

@dawnofgeospatialworld 9 ай бұрын

Yes you can use it, but it doesn't give the accurate temperature for all time because of the temp. difference between Land & Water.

@rayjaybalderama3443 9 ай бұрын

do I still need to calculate the ndvi for water temperature? If not, what should I calculate?

@dawnofgeospatialworld 9 ай бұрын

@@rayjaybalderama3443 You can Check Chlorophyll Index instead of NDVI. But I don't think This method will that much effective for Water Temperature.

@dawnofgeospatialworld 9 ай бұрын

@@rayjaybalderama3443 As you can see in this video, if you need inland water surface temperature, you can use LST method. There are some small waterbodies in that location & surface temperature was calculated. But if you want to calculate sea surface temperature, there will be different method to calculate that.

@amritanshchaubey231 3 ай бұрын

Hello mam, I'm doing same steps as you but my LST value is very high(53 to 81). I'm using landsat 8...

@dawnofgeospatialworld 3 ай бұрын

Mask/clip with your study area

@thenameisabii 2 ай бұрын

mine is coming 66to 81

@thenameisabii 2 ай бұрын

using landsat 10

@dawnofgeospatialworld 2 ай бұрын

@@thenameisabii Landsat 10?

@АртурГолятин 2 ай бұрын

I had the same problem, i fixed it by checking my initial data from landsat8. For this tutorial you have to use Lvl 1 data instead of Lvl 2. (In my case i used [ L1TP ] instead of [ L2SP ] from Landsat8)