Online Drought Indicators and Indices

Temperature Condition Index (TCI)

 

Index name: Temperature Condition Index (TCI).

Ease of use: Green.

Origins: Developed from work done by Kogan with NOAA in the United States.

Characteristics: Using AVHRR thermal bands, TCI is used to determine stress on vegetation caused by temperatures and excessive wetness. Conditions are estimated relative to the maximum and minimum temperatures and modified to reflect different vegetation responses to temperature.

Input parameters: AVHRR satellite data.

Applications: Used in conjunction with NDVI and the Vegetation Condition Index (VCI) for drought assessment of vegetation in situations where agricultural impacts are the primary concern.

Strengths: High resolution and good spatial coverage.

Weaknesses: Potential for cloud contamination as well as a short period of record.

Resources: Methodology and calculations are provided in the literature and online resources of products are available at the NOAA STAR – Global Vegetation Health Products webpage.

Reference: Kogan, F.N., 1995: Application of vegetation index and brightness temperature for drought detection. Advances in Space Research, 15(11): 91–100. DOI: 10.1016/0273-1177(95)00079-T. (For more information on this paper, please contact the IDMP HelpDesk).

Currently used by: Iran.

9 Comments
  1. Dagim
    November 21, 2016 Reply

    plz send Temperature condition index vector data for country of Ethiopia

    1. Robert Stefanski
      November 22, 2016 Reply

      Dear Dagim,

      Please look at the following link:
      http://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/vh_browse.php

      Regards,

      Robert

  2. sunil bhandari
    March 3, 2017 Reply

    how to calculate TCI and where can we get data??

    1. Robert Stefanski
      March 3, 2017 Reply

      Please take a look at the following link to access the data:

      https://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/vh_ftp.php

      These data are available online through an anonymous FTP servers.
      Click on link “4km AVHRR-VHP data in NETCDF format (since 2009)”
      This will access the FTP site where you can download the VH file (*.VH.nc or *.VH.hdf): which contains VCI,TCI,VHI.

  3. temesgen fikadie
    March 14, 2017 Reply

    thank you for your best contribution !!! but i can not get the accesses specialy TCI as much as possible send by PDF

    1. Robert Stefanski
      March 15, 2017 Reply

      The TCI files are quite large. I am not sure we can process the data. Please be specific on which areas and dates you need.
      We will check for some other sources that might have a summary or a an easier way to get the information.

  4. sunil bhandari
    August 13, 2017 Reply

    I am doing projectusing MODIS image having spatial resolution 250m and temporal resolution 16 days and Can i get direct TCI having resolution of 250m of a country nepal?

    1. Robert Stefanski
      August 30, 2017 Reply

      Please try to access the following webpage:
      https://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/vh_browseByCountry.php

      Also, we will request some of our partners to look into your question.

    2. Robert Stefanski
      August 31, 2017 Reply

      Please see the following response from the IDMP Support Based Partner from the George Mason University (GMU) in the USA.
      One cannot get TCI at 250m resolution, one only can get VCI at 250m resolution with MODIS 16-day NDVI products.

      TCI is originally designed with brightness temperature of NOAA AVHRR channel 4 (the TIR channel around 11micron) (http://www.droughtmanagement.info/temperature-condition-index-tci/).

      For MODIS, the corresponding channel is band 31, with a spatial resolution of 1km (not 250m, MODIS has 36 spectral channels, only channels 1 and 2 have spatial resolution at 250m) (https://modis.gsfc.nasa.gov/about/specifications.php) .

      For MODIS data, if calculate TCI with brightness temperature, have to start with MODIS L1B data products (MOD02), it’s quite complicated. However, can try to use the daily or 8-day gridded land surface temperature products (MOD11) to calculate TCI, the spatial resolution is 1km.

      MODIS gridded land products are organized by tiles with SIN map project (https://modis-land.gsfc.nasa.gov/MODLAND_grid.html) . To get TCI (or VCI or VHI) for a specific area, need to download MODIS data tiles covering the area. For Nepal, need 4 tiles (h24v05, h24v06, h25v05, h25v06), then mosaic and resample to the data.

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