Status for: Land Surface Temperature and Emissivity (MOD11)
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General Accuracy Statement
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The MODIS MOD11 (Terra) and MYD11 (Aqua) Collection 5 (C5) products have been validated at Stage 2 via a series of field campaigns conducted in 2000-2007, and over more locations and time periods through radiance-based validation studies. Accuracy is better than 1K (0.5K in most cases), as expected pre-launch. For the daily 1 km products, slightly higher errors may occur at large view angles and in semi-arid regions. Higher errors in some arid regions are apparent for these products generated by the split-window algorithm, due to effects of heavy dust aerosols and greater uncertainties in classification-based surface emissivities. For the 6km (MOD11B1) product generated by the day/night algorithm, these errors are also evident, due to the strong influence of incorporating the split-window algorithm. The error in land surface temperatures (LSTs) contaminated by clouds and heavy aerosols can be very large (4-11K or even larger). It is very difficult for the MODIS cloud-mask to discriminate all pixels affected by clouds and heavy aerosols from clear-sky pixels, particularly near cloud edges and/or with sub-pixel clouds. The LSTs that are severely contaminated by clouds and heavy aerosols are removed from C5 Level-3 MODIS LST products using empirical constraints on temporal variations in clear-sky LSTs. The Collection 4.1 (C4.1) LST products are generated by using the Version 4 (V4) LST algorithms generated with Collection 5 input data products, thus being very similar to the Collection 4 LST products. The differences between the V4 and V5 LST algorithms are described in the paper of Z. Wan (see list below) "New refinements and validation of the MODIS land-surface temperature/emissivity products," RSE, 112, 2008. The effects of heavy dust aerosols on MOD11B1/MYD11B1 products generated by the day/night algorithm are relatively smaller in the C4.1 products vs. the C5 products because the V4 day/night algorithm applied more weight to the shorter wavelength bands (i.e., bands 20, 22, 23 and 29), where the effects of aerosols are smaller. The LSTs that are severely contaminated by clouds are not removed from C4.1 Level-3 MODIS LST products, thus some inexplicably low values in C4.1 MOD11B1/MYD11B1 band 31 emissivity may exist, even in vegetated areas.
Product status updated: October 2009 (reviewed April 2011)
Product version: Collection 4.1 and 5
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Supporting Studies:
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| Title: Intercomparison of versions 4, 4.1 and 5 of the MODIS Land Surface Temperature and Emissivity products and validation with laboratory measurements of sand samples from the Namib desert, Namibia | | Author: Glynn C. Hulley, Simon J. Hook | | Source: Remote Sensing of Environment 113 (2009) 1313-1318 | | View Summary Results From This Document | | | Title: Temperature-based and radiance-based validations of the V5 MODIS land surface temperature product | | Author: César Coll, Zhengming Wan, and Joan M. Galve | | Source: Journal of Geophysical Research, (2009), Vol. 114, D20102, doi:10.1029/2009JD012038 | | View Summary Results From This Document | | | Title: Radiance-based validation of the V5 MODIS land-surface temperature product | | Author: Z. Wan and Z.-L. Li | | Source: International Journal of Remote Sensing, 2008, 29:17, 5373-5395 | | View Summary Results From This Document | | | Title: New refinements and validation of the MODIS land-surface temperature/emissivity products | | Author: Z. Wan | | Source: Remote Sens. Environ., 112 (2008), 59-74 | | View Summary Results From This Document | | | Title: A comparison of MODIS land surface temperature with in situ observations | | Author: Michael G. Bosilovich | | Source: Geophysical Research Letters, Vol. 33, L20112, doi:10.1029/2006GL027519, 2006 | | View Summary Results From This Document | | | Title: Ground measurements for the validation of land surface temperatures derived from AATSR and MODIS data | | Author: César Coll, Vicente Caselles, Joan M. Galve, Enric Valor, Raquel Niclòs, Juan M. Sánchez, Raúl Rivas | | Source: Remote Sensing of Environment, 97, 288-300, 2005 | | View Summary Results From This Document | | | Title: Ground measurements for the validation of land surface temperatures derived from AATSR and MODIS data | | Author: César Coll, Vicente Caselles, Joan M. Galve, Enric Valor, Raquel Niclòs, Juan M. Sánchez and Raúl Rivas | | Source: Remote Sensing of Environment, 97:3 (Aug 2005), Pages 288-300 | | View Summary Results From This Document | | | Title: Quality assessment and validation of the MODIS global land surface temperature | | Author: Zhengming Wan, Yulin Zhang, Qincheng Zhang, Zhao-liang Li | | Source: Int. J. Remote Sensing, 10 January, 2004, Vol. 25, No. 1, 261-274 | | View Summary Results From This Document | | | Title: Validation of the land-surface temperature products retrieved from Terra Moderate Resolution Imaging Spectroradiometer data | | Author: Zhengming Wan, Yulin Zhang, Qincheng Zhang, Zhao-liang Li | | Source: Remote Sensing of Environment, Nov 2002, 83:163-180 | | View Summary Results From This Document | |
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Additional Validation and Product Quality
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