Contents:

Algorithm Description
Scientific Data Sets
Local Attributes
Global Attributes
Quality Assurance

MOD11C2 8-Day CMG LST

This LST product provides 8-day composited and averaged temperature and emissivity values at 0.05 degree latitude/longitude grids (CMG), as well as the averaged observation times and viewing zenith angles for daytime and nighttime LSTs.

Algorithm Description

The temperature and emissivity values in the MOD11C1 product over a period of 8 days are simply composited and averaged. The days and nights in clear-sky conditions and with valid LSTs are flagged in each bit of two 8-bit unsigned integers (one for daytime LSTs and another for nighttime LSTs).

Scientific Data Sets (SDS)

There are 16 SDSs in the MOD11C2 product as shown in Table 18. 

Table 18. The SDSs in the MOD11C2 product.
 
SDS
Name		 Long
Name		 Number
Type		 Unit Valid
Range		 Fill
Value		 scale
factor		 add
offset
LST_Day_CMG 8-day daytime 3min CMG
Land-surface Temperature		 uint16 K 7500-65535 0 0.02 0.0
QC_Day Quality control for daytime
LST and emissivity		 uint8 none 0-255 0 NA NA
Day_view_time Averaged time of daytime
LST
observation (UTC)		 uint8 hrs 0-120 0 0.2 0
Day_view_angle Averaged view zenith angle of
daytime
Land-surface Temperature		 uint8 deg 0-130 255 1.0 -65.0
* Clear_sky_days the days in clear-sky conditions
and with validate LSTs		 uint8 none 0-255 0 na na
LST_Night_CMG 8-day nighttime 3min CMG
Land-surface Temperature		 uint16 K 7500-65535 0 0.02 0.0
QC_Night Quality control for nighttime
LST and emissivity		 uint8 none 0-255 0 NA NA
Night_view_time Averaged time of nighttime
LST
observation (UTC)		 uint8 hrs 0-120 0 0.2 0
Night_view_angle Averaged view zenith angle of nighttime
Land-surface Temperature		 uint8 deg 0-130 255 1.0 -65.0
* Clear_sky_nights the nights in clear-sky conditions
and with validate LSTs		 uint8 none 0-255 0 na na
Emis_20 Band 20 emissivity uint8 none 1-255 0 0.002 0.49
Emis_22 Band 22 emissivity uint8 none 1-255 0 0.002 0.49
Emis_23 Band 23 emissivity uint8 none 1-255 0 0.002 0.49
Emis_29 Band 29 emissivity uint8 none 1-255 0 0.002 0.49
Emis_31 Band 31 emissivity uint8 none 1-255 0 0.002 0.49
Emis_32 Band 32 emissivity uint8 none 1-255 0 0.002 0.49

* Each bit in the 8-bit unsigned integer indicates clear-sky (1) or not (0) in the corresponding day or night. Bit 00 is for the first day or night, and bit 07 is for the last day or night in the 8-day period.

Local Attributes

The local attributes for SDSs LST_Day_CMG and LST_Night_CMG are similar to those in Table 4. 

Global Attributes

Three ECS global attributes and 16 product-specific global attributes are stored as metadata. The ECS global attributes, CoreMetadata.0, ArchiveMetadata.0 and StructMetadata.0 are stored as very long character strings in PVL format. 

CoreMetadata.0 contains information about the product during production and is used to populate the EOSDIS data base for user support. They are similar to those of MOD11A1.

Quality Assurance

The bit flags in the QC SDS are similar to those in Table 17.