# Presentation: 179027

## Status of the MODIS Land-Surface Temperature/Emissivity Product: 

- Status of the MODIS Land-Surface Temperature/Emissivity Product:
- New Validations and Improvements
- Zhengming Wan
- University of California, Santa Barbara
- July 24, 2002

- MODIS Science Team Meeting

- Z. Wan - 1

## Validation of MODIS LST Products

- Credit also to:

- Simon Hook (JPL),  Zhao-liang Li  (GRTR/LSIIT, France),

- William C. Snyder (May 1995 – April 1997), Yulin Zhang (Dec 1994 -), Qincheng Zhang (July 2001 -),

- Pengxin Wang (Sept 2001 – Feb 2002), Xialin Ma (Oct 1997 – Mar 2001), Ruibo Wang (Apr 1998 –

- May 2001), Yuezhong Feng (1997 – 1998).

- Special thanks for supports from

- NASA HQ,  EOS Project Office,  MODIS Science Team,  MSST,

- GSFC DAAC,  EDC DAAC,  NSIDC,  MODLAND,  MCST,   SDDT,  MODAPS,  LDOPE,

- NASA/Ames/Airborne Sensor Facility,  NASA/JPL/AVIRIS Team,  NASA Dryden Flight RC,

- Robert Jellison (UCSB/SNARL),  Richard E. Plant (UC Davis),

- Stan Hunewill and Jeff Hunewill (Hunewill Guest Ranch),  Sophie Moreau (ABTEMA, Bolivia),

- Arnaud Yves & Roland Bosseno (IRD, Bolivia),  etc.

- Z. Wan - 2

- Outline of the Presentation

- Validations of the MODIS LST product

- Plan for the Fall of 2002

- Conclusion of the MOD11 Status

- Z. Wan - 3

- New improvements of the MODIS LST code

- New LST results from Terra and Aqua MODIS data

## Validation results of the MODIS LST products

- Z. Wan - 4

- A LST validation
- paper is in press
- for Remote Sensing
- of Environment.

## Comparison of LSTs in MOD11A1 with those measured

-  by Dr. Hook in Lake Tahoe in 2000

- Z. Wan - 5

- Seasonal variation shown by the MODIS LSTs at accuracy better than 0.6K.

## Validation of the MODIS LST product in wet atmospheric conditions: (1) three TIR radiometers deployed in a rice field in State of Mississippi 

- Validation of the MODIS LST product in wet atmospheric conditions: (1) three TIR radiometers deployed in a rice field in State of Mississippi

- Z. Wan - 6

- Since late June 2002.

## Validation of the MODIS LST product in wet atmospheric conditions: (2) five TIR radiometers

- deployed in a soybean field in State of Mississippi

- Z. Wan - 7

- Since late June 2002.

## New improvements of the MODIS LST code

- 2.  Use the MODIS BRDF product (MOD43B1C) as input.

- 5.  The Terra and Aqua MODIS data may be used jointly in the

- 3.  the range of viewing zenith angle separated into 5 sub-ranges

- Z. Wan - 8

- 1.  Lake pixels in clear-sky at MOD35 confidence 66% and higher

- are processed (per suggestions from Simon Hook and others).

- (0-24, 24-38, 38-49, 49-58, 58-65) instead of 4.

- 4.  Parallel processing for data of odd days and even days so that

- the production rate may be doubled.

- day/night LST algorithm for better spatial and angular coverage.

- 6.  A split-window method was incorporated into the day/night

- algorithm to ensure that the retrieved emissivities can be used

- by split-window algorithms.

## Estimate of the NEdT and Calibration Accuracy of

- Estimated bias in calibration of
- MYD021KM.A2002177.0600
- over Lake Titicaca compared
- with bias in Terra MODIS TIR
- bands (Wan et al 2002).

- Estimated NEdT values based on L1B
- granules MOD021KM.A2002177.0300
- and MYD021KM.A2002177.0600 (June
- 26, 2002) over Lake Titicaca

-                the early Aqua MODIS TIR data

- Z. Wan - 9

**Notes:**
Band	

## LSTs retrieved from Terra and Aqua MODIS data

- K

- Z. Wan - 10

- on data days 176-177 and 185-190 (06/25-26 & 07/4-9)

- daytime

- Terra

- nighttime

- Terra

- daytime

- Aqua

- nighttime

- Aqua

- to show spatial distribution of the diurnal variation

## Surface emissivities retrieved by Terra and Aqua MODIS

- in data days 176-177 and 185-190 (06/25-26 & 07/4-9)

- Z. Wan - 11

- Color composite image with emissivities in
-  bands 29, 22, and 20 as RGB components.

- Color composite image with emissivities in
- bands 29, 31, and 32 enhanced by the equaliz-
- ation histogram method as RGB components.

## Compare the retrieved surface emissivities over Sahara

- Z.  Wan - 12

- Desert to those measured from sand samples in the Lab

## Compare the retrieved surface emissivities in Caspian Sea

-            to the calculated water surface emissivities

- Z. Wan - 13

## Plan for the Fall of 2002

- 1. To validate the MODIS LST product in wet atmospheric

- 2. To conduct field campaigns in the areas of Mono Lake, Lake

- Z. Wan - 14

- conditions with field measurement data in State of Mississippi.

- Tahoe, and Walker Lake in CA and NV in the period of August

- 5-16 with MAS day/night flights around the Terra and Aqua

- overpass times to estimate the calibration of Aqua MODIS

- TIR bands and to validate the MODIS LST product.

## Conclusion of the MOD11 Product Status

- 1. The LST products were validated within 1K with in situ LSTs in 19 cases (including 14 cases over land sites) in the LST range of 263-322K and the atmospheric cwv range of 0.4-3.0cm, and Simon Hook’s Lake Tahoe data

- 2. Validated MODIS LST products will be generated in the next reprocessing (collection 4 by Oct. 2002)

- Z. Wan - 15

- in 2000-2002.

- while validation activities will be continued especially
- for the Aqua MODIS LST products.