The false-colored MYD11C3 images shown were retrieved from MODIS data acquired during the same month of different years (August 2002 above and August 2007 below).
The level-3 MODIS global Land Surface Temperature (LST) and Emissivity monthly data are composed from the daily MYD11C1 product and stored as the averaged values of clear-sky LSTs during a monthly period in a 0.05-degree (5600-meter) geographic Climate Modeling Grid (CMG).
MYD11C3 is a level-3 product comprised of daytime and nighttime LSTs, quality assessment, observation times, view angles, bits of clear-sky days and nights, and emissivities retrieved in Bands 20, 22–23, 29, and 31–32.
Version-5 MODIS/Aqua Land Surface Temperature/Emissivity products are validated indirectly through the daily 6-km product, MYD11B1, toStage 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 when monthly averaged LSTs are applications-appropriate.
Collection 5 Changes in the V5 PGE16 (PDF)
Temporal Coverage | July 4, 2002 - |
Area | Global |
File Size | ~80 MB compressed |
Projection | Lat/Lon |
Data Format | HDF-EOS |
Dimensions | 3600 x 7200 rows/columns |
Resolution | 0.05 degrees (5600-m at the equator) |
Science Data Sets (SDS HDF Layers) | 17 |
Science Data Sets for MODIS/Aqua Land Surface Temperature/Emissivity Monthly L3 Global 0.05Deg CMG V005 (MYD11C3):
Science Data Sets (HDF Layers) (17) |
UNITS |
BIT TYPE |
FILL |
VALID RANGE |
MULTIPLY BY SCALE FACTOR |
---|---|---|---|---|---|
LST_Day_CMG: Monthly daytime 3min CMG 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: Average time of daytime land surface temperature observation (UTC) | Hours | 8-bit unsigned integer | 0 | 0–120 | 0.2 |
Day_view_angle: Average view zenith angle of daytime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (- 65) |
Clear_sky_days: the days in clear-sky conditions and with valid LSTs | none | 8-bit unsigned integer | 0 | 1–255 | na |
LST_Night_CMG: Monthly nighttime 3min CMG 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: Average time of nighttime land surface temperature observation (UTC) | Hours | 8-bit unsigned integer | 0 | 0–120 | 0.2 |
Night_view_angle: Average view zenith angle of nighttime land surface temperature | Degree | 8-bit unsigned integer | 255 | 0–130 | 1 (-65) |
Clear_sky_nights: the nights in clear-sky conditions and with valid LSTs | none | 8-bit unsigned integer | 0 | 1–255 | na |
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 (+.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) |
Percent_land_in_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) 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 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 MYD11C3 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 <= 1 K |
01 | Average LST error <= 2K | ||
10 | Average LST error <= 3K | ||
11 | Average LST error > 3K |
The table below lists the bit field legend for the LST Clear-Sky definitions.
Bit No. |
Long Name |
Bit Comb. |
V005 MYD11C3 Clear_Sky_Day/Clear_Sky_Nights |
---|---|---|---|
00 | Day/Night 1 Clear Sky Flag | 00 | Day /Night 1 is not clear-sky |
01 | Day /Night 1 is clear-sky | ||
01 | Day/Night 2 Clear Sky Flag | 00 | Day /Night 2 is not clear-sky |
01 | Day /Night 2 is clear-sky | ||
2^i | Day/Nighti+1 | 00 | Day /Night i+1 is not clear-sky |
01 | Day /Night i+1 is clear-sky |
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.
LP DAAC User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001
The complete data record for this product is available through the WIST search and order interface. A near-complete record is available on-line through the Data Pool.
Please find links to (and information about) these data access tools on the Get Data Section of this Web Site.
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 |