Global MOD13C2 data are cloud-free spatial composites of the gridded monthly 1-km MOD13A3 product. MOD13C3 is provided as a level-3 product projected on a 0.05 degree (5600-meter) geographic (lat/lon) Climate Modeling Grid (CMG). Cloud-free global coverage is achieved by replacing clouds with the historical MODIS time series climatology record.
MOD13C2 product is analogous to MOD13C1 but based on MOD13A3 for a monthly temporal resolution; all other specs are kept the same, and production features retained. See Section 8 for more details.
Algorithm is as for MOD13C1, but using monthly MOD13A3 as input.
MOD13C2 VI product has 13 SDSs, as listed in Table 19.
Science Data Set |
Units |
Data type |
Valid Range |
Scale factor |
CMG 0.05 Deg Monthly NDVI |
NDVI |
int16 |
-2000, 10000 |
0.0001 |
CMG 0.05 Deg Monthly EVI |
EVI |
int16 |
-2000, 10000 |
0.0001 |
CMG 0.05 Deg Monthly VI Quality |
Bits |
uint16 |
0, 65534 |
NA |
CMG 0.05 Deg Monthly red reflectance (Band 1) |
Reflectance |
int16 |
0, 10000 |
0.0001 |
CMG 0.05 Deg Monthly NIR reflectance (Band 2) |
Reflectance |
int16 |
0, 10000 |
0.0001 |
CMG 0.05 Deg Monthly blue reflectance (Band 3) |
Reflectance |
int16 |
0, 10000 |
0.0001 |
CMG 0.05 Deg Monthly MIR reflectance (Band 7) |
Reflectance |
int16 |
0, 10000 |
0.0001 |
CMG 0.05 Deg Monthly Avg sun zenith angle |
Degree |
int16 |
-9000, 9000 |
0.01 |
CMG 0.05 Deg Monthly NDVI std dev |
NDVI |
int16 |
-2000, 10000 |
0.0001 |
CMG 0.05 Deg Monthly EVI std dev |
EVI |
int16 |
-2000, 10000 |
0.0001 |
CMG 0.05 Deg Monthly #1km pix used |
Pixels |
uint8 |
0, 36 |
1 |
CMG 0.05 Deg Monthly #1km pix +-30deg VZ |
Pixels |
uint8 |
0, 36 |
1 |
CMG 0.05 Deg Monthly pixel reliability |
Rank |
int8 |
0, 4 |
1 |
As in MOD13C1, QA metadata objects summarize tile-level quality with several single words and numeric numbers, and thus are useful for data ordering and screening processes.
QA SDSs document product quality on a pixel-by-pixel basis and thus are useful for data analyses and application uses of the data. Each MOD13C3 output pixel has a ranked summary quality SDS (Table 4), and a single QA SDS for both NDVI and EVI quality assurance (Table 5).
A listing of the metadata fields used for QA evaluations of the MOD13C2 VI product is included in Table 16.
QA SDS for MOD13C3 are the same as for MOD13C1 (See Section for details).