Vegetation Index (VGI)
[DOI: 10.57746/EO.01gs73b3y17efdvmj1ajftbfr2]
Introduction
NDVI, EVI | Define | Indices indicating vegetation cover and activity such as NDVI and EVI |
Unit | none | |
ATBD |
Ver.1 (Nov. 2018) |
|
SDI | Define | An index indicating shadow fraction of vegetation area inferred from spectral reflectance. |
Unit | none | |
ATBD |
Ver.1 (Sep. 2014) Ver.2 (May 2020) Ver.3 (Oct. 2021) |
Update contents of Ver.2
- ・Modified the parameter of shadow index calculation
- ・Modified QA flag
Update contents of Ver.3
- ・Added Cosine_of_solar_incidence from slope normal to Geometry_data
- ・Modified QA_flag
- ・Modified SDI calculation parameters
Sample image
File format | Ver.1 | Ver.2 | Ver.3 |
---|---|---|---|
hdf5 |
TBU |
VGI_Q(250m) |
VGI_Q(250m) |
Image |
TBU |
EVI(250m) NDVI(250m) SDI(250m) |
EVI(250m) NDVI(250m) SDI(250m) |
Dataset name
Ver1,2,3 | Description |
---|---|
EVI | Enhanced Vegetation Index |
NDVI | Normalized Difference Vegetation Index |
QA_flag | |
SDI | Shadow Index |
QA_flag information
Ver.1 Ver.2 Ver.3 Ver.1(Sample Image) Ver.2(Sample Image) Ver.3(Sample Image)
Bit | Data name | Description | EVI_L3_mask* | NDVI_L3_mask* | SDI_L3_mask* |
---|---|---|---|---|---|
0 | no data | 1: VN08 and/or VN11 are error | 1 | 1 | 1 |
1 | land/water | 0: water >50%, 1: land > 50% | 0 | 0 | 0 |
2 | mixed with land/water | 1: land and water > 1% | 0 | 0 | 0 |
3 | cloud | 1: cloud | 1 | 1 | 1 |
4 | probably cloud | 1: probably cloud | 0 | 0 | 0 |
5 | snow or ice | 1: snow or ice | 0 | 0 | 0 |
6 | no data for EVI | 1: no data for EVI | 0 | 0 | 0 |
7 | no data for SDI | 1: no data for SDI | 0 | 0 | 1 |
8 | bad input for SW | 1: bad input for SW | 0 | 0 | 1 |
9 | bad input for VN | 1: bad input for VN | 1 | 0 | 0 |
10 | solar zenith angle >70 | 1: sza > 70° | 1 | 1 | 0 |
11 | sensor zenith angle >45 | 1: vza > 45° | 0 | 0 | 0 |
12 | EVI <-0.2 or EVI >1.0 | 1: EVI < -0.2 or 1.0 < EVI | 1 | 0 | 0 |
13 | large incident angle | 1: cos(incident angle) < 0.1 | 0 | 0 | 0 |
14 | small NDVI | 1: NDVI < 0.65 | 0 | 0 | 0 |
15 | anti solar side | 1: anti solar side | 0 | 0 | 0 |
* Bits masked by statistical processing are indicated by 1.
Please refer to here to the detail information for QA flag.
Bit | Data name | Description | EVI_L3_mask* | NDVI_L3_mask* | SDI_L3_mask* |
---|---|---|---|---|---|
0 | no data | 1: VN08 and/or VN11 are error | 1 | 1 | 1 |
1 | land/water | 0: water >50%, 1: land > 50% | 0 | 0 | 0 |
2 | mixed with land/water | 1: land and water > 1% | 0 | 0 | 0 |
3 | cloud | 1: cloud | 1 | 1 | 1 |
4 | probably cloud | 1: probably cloud | 0 | 0 | 0 |
5 | snow or ice | 1: snow or ice | 0 | 0 | 0 |
6 | shadow | 1: shadow | 1 | 1 | 0 |
7 | bad input for NDVI | 1: bad input for NDVI | 0 | 1 | 0 |
8 | bad input for SDI | 1: bad input for SDI | 0 | 0 | 1 |
9 | bad input for EVI | 1: bad input for EVI | 1 | 0 | 0 |
10 | solar zenith angle >70 | 1: sza > 70° | 1 | 1 | 0 |
11 | sensor zenith angle >30 | 1: vza > 30° | 0 | 0 | 0 |
12 | EVI <-0.2 or EVI >1.0 | 1: EVI < -0.2 or 1.0 < EVI | 1 | 0 | 0 |
13 | large incident angle | 1: cos(incident angle) < 0.1 | 0 | 0 | 0 |
14 | small NDVI | 1: NDVI < 0.65 | 0 | 0 | 0 |
15 | anti solar side | 1: anti solar side | 0 | 0 | 0 |
* Bits masked by statistical processing are indicated by 1.
Please refer to here to the detail information for QA flag.
Bit | Data name | Description | EVI_L3_mask* | NDVI_L3_mask* | SDI_L3_mask* |
---|---|---|---|---|---|
0 | no data | 1: VN08 and/or VN11 are error | 1 | 1 | 1 |
1 | land/water | 0: water >50%, 1: land > 50% | 0 | 0 | 0 |
2 | mixed with land/water | 1: land and water > 1% | 0 | 0 | 0 |
3 | cloud | 1: cloud | 1 | 1 | 1 |
4 | probably cloud | 1: probably cloud | 0 | 0 | 0 |
5 | snow or ice | 1: snow or ice | 0 | 0 | 0 |
6 | shadow | 1: shadow | 1 | 1 | 0 |
7 | bad input for NDVI | 1: bad input for NDVI | 0 | 1 | 0 |
8 | bad input for SDI | 1: bad input for SDI | 0 | 0 | 1 |
9 | bad input for EVI | 1: bad input for EVI | 1 | 0 | 0 |
10 | solar zenith angle >70 | 1: sza > 70° | 1 | 1 | 0 |
11 | sensor zenith angle >30 | 1: vza > 30° | 0 | 0 | 0 |
12 | EVI <-0.2 or EVI >1.0 | 1: EVI < -0.2 or 1.0 < EVI | 1 | 0 | 0 |
13 | large incident angle | 1: cos(incident angle) < 0.1 | 0 | 0 | 0 |
14 | small NDVI | 1: NDVI < 0.75 | 0 | 0 | 0 |
15 | anti solar side | 1: anti solar side | 0 | 0 | 0 |
* Bits masked by statistical processing are indicated by 1.
Please refer to here to the detail information for QA flag.
*Download:QA_flag(Ver1)

Attribute information
How to use
- ・Physical quantity=DN*slope + offset
- ・Valid values are during Minimum_valid_DN~Maximum_valid_DN