The above false-color image shows the daytime LSTs under clear-sky conditions in the MOD11B1 product retrieved from MODIS data on March15, 2007 over the southwestern United States and Baja California.
The level-3 MODIS global Land Surface Temperature (LST) and Emissivity daily data are retrieved at 6-kilometer (actual 5.6-km) grids in a Sinusoidally projected tile by the day/night LST algorithm from pairs of MODIS daytime and nighttime observations in seven bands under certain conditions.
MOD11B1 is comprised of the 5.6-km daytime and nighttime LSTs, quality assessment, observation times, view angles, and emissivities retrieved in Bands 20, 22–23, 29, and 31–32. MOD11B1 also includes the daytime and nighttime LSTs generated from the level-2 MOD11_L2 through the 1-km Band 31 radiance values aggregated to 5.6-km grids.
Version-5 MODIS/Terra Land Surface Temperature/Emissivity products are Validated Stage 2, meaning that accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts. Although there may be later improved versions, these data are ready for use in scientific publications.
Collection 5 Changes in the V5 PGE16 (PDF)
Temporal Coverage | March 5, 2000 - |
Area | ~1100 x 1100 km |
File Size | ~0.4 MB compressed |
Projection | Sinusoidal |
Data Format | HDF-EOS |
Dimensions | 200 x 200 rows/columns |
Resolution | 6 kilometer (5.6-km) |
Science Data Sets (SDS HDF Layers) | 18 |
Science Data Sets for MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 6km SIN Grid V005 (MOD11B1):
Science Data Sets (HDF Layers) (18) |
UNITS |
BIT TYPE |
FILL |
VALID RANGE |
MULTIPLY BY SCALE FACTOR |
---|---|---|---|---|---|
LST_Day_6km: Daily daytime 6km grid land surface temperature | Kelvin | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
QC_Day: Quality control for daytime LST and emissivity | Bit Field | 8-bit unsigned integer | See QA NOTE | 0–255 | na |
Day_view_time: Time of daytime land surface temperature observation | Hours | 8-bit unsigned integer | 255 | 0–120 | 0.2 |
Day_view_angle: View zenith angle of daytime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (-65) |
LST_Night_6km: Daily nighttime 6km grid land surface temperature | Kelvin | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
QC_Night: Quality control for nighttime LST and emissivity | Bit Field | 8-bit unsigned integer | See QA NOTE | 0–255 | na |
Night_view_time: Time of nighttime land surface temperature observation | Hours | 8-bit unsigned integer | 255 | 0–120 | 0.2 |
Night_view_angle: View zenith angle of nighttime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (-65) |
Emis_20: Band 20 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
Emis_22: Band 22 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
Emis_23: Band 23 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
Emis_29: Band 29 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
Emis_31: Band 31 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
Emis_32: Band 32 Emissivity | none | 8-bit unsigned integer | 0 | 1–255 | 0.0020 (+0.49) |
LST_Day_6km_Aggregated_from_1km: Daily daytime 6km grid aggregated from 1km | Kelvin | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
LST_Night_6km_Aggregated_from_1km: Daily nighttime 6km grid aggregated from 1km | None | 16-bit unsigned integer | 0 | 7500–65535 | 0.02 |
QC_Emis: Quality control for retrieved emissivities | Bit Field | 8-bit unsigned integer | See QA NOTE | 0–255 | na |
Percent_land_in_grid: Percentage of land in the grid | Percent | 8-bit unsigned integer | 0 | 1–100 | na |
The table below lists the bit field legend for the LST Quality Indicators.
The QC science data sets in this product (QC_Day, QC_Night, and QC_Emis) provide the user with information on algorithm results that can be viewed in a spatial context for each pixel. The QC information tells if algorithm results were nominal, abnormal, or if other defined conditions were encountered for a pixel. The QC information should be used to help determine the usefulness of the LST data for a user's needs. The QC information can be extracted by reading the flags stored in an 8-bit unsigned integer. See Table 1 (QC_Day, QC_Night) and Table 2 (QC_Emis) below.
Table 1: LST Quality Indicators, Day and Night
NOTE: There is no FillValue for the QC SDS. This SDS should be used together with the LST SDS. If LST has FillValue 0, the 0-1 bits in QC have values of 10 or 11, other bit fields with 0 as undefined.
Bit No. |
Long Name |
Bit Comb. |
V005 MOD11B1 QC_DAY, QC_NIGHT |
---|---|---|---|
0–1 | Mandatory QA Flags | 00 | LST produced, good quality, not necessary to examine more detailed QA |
01 | LST produced, other quality, recommend examination of more detailed QA | ||
10 | LST not produced due to cloud effects | ||
11 | LST not produced primarily due to reasons other than cloud | ||
2 | Data Quality Flag | 0 | Good data quality of L1B in 7 TIR bands |
1 | Other quality data | ||
3 | Terra/Aqua combined-use flag | 0 | No |
1 | Yes | ||
4–5 | Emis Error Flag | 00 | Average emissivity error <= 0.01 |
01 | Average emissivity error <= 0.02 | ||
10 | Average emissivity error <= 0.04 | ||
11 | Average emissivity error > 0.04 | ||
6–7 | LST Error Flag | 00 | Average LST error <= 1K |
01 | Average LST error <= 2K | ||
10 | Average LST error <= 3K | ||
11 | Average LST error > 3K |
Table 2: Emissivity Quality Indicators
NOTE: There is no FillValue for this SDS. It should be used together with LST_Day_6km or LST_Night_1km.
Bit No. |
Long Name |
Bit Comb. |
V005 MOD11B1 QC_Emis |
---|---|---|---|
0–3 | View angle flag of the companion observation (which is night obs if LST_Day_6km valid, or day obs otherwise | 0–15 | Index of view angle sub-range of the companion observation |
0–7 | If view from East (0 at the west end of scan line) | ||
8–15 | If view from West (15 at east end of scan line) | ||
4–6 | Time difference between day and night MODIS observations | 0–7 | Couple of days, 7 representing the range from 7 to 16 |
7 | DEM slope flag | 0 | DEM slope not considered |
1 | DEM slope considered in day/night method |
Please find the current MODIS-related Data Redistribution and Pricing policies on the MODIS Policies Section of this Web Site
LP DAAC Acknowledgement and Citations Policy
In the event that data distributed from the Land Processes DAAC are incorporated into your research, please supply the following acknowledgment within your published work: "These data are distributed by the Land Processes Distributed Active Archive Center (LP DAAC), located at the U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center (lpdaac.usgs.gov)." If possible, please e-mail or send us reprints/citations of papers or oral presentations based on data obtained from the LP DAAC (see below for mailing address and e-mail address). This will help us to stay informed of how the data are being utilized.
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47914 252nd Street
Sioux Falls, SD 57198-0001
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U.S. Geological Survey (USGS)
Center for Earth Resources Observation and Science (EROS)
47914 252nd Street
Sioux Falls, SD 57198-0001
Phone Number: | 605-594-6116 |
Toll Free: | 866-573-3222 |
866-LPE-DAAC | |
Fax: | 605-594-6963 |
Email: | lpdaac@eos.nasa.gov |
Web: | http://lpdaac.usgs.gov |