4 MODIS VI Product Sequence

There are 6 products in the MODIS VI sequence¹:

1. MOD13Q1: 16-day 250-m VI

2. MOD13A1: 16-day 500-m VI

3. MOD13A2: 16-day 1-km VI

4. MOD13A3: monthly 1-km VI

5. MOD13C1: 16-day 0.05-deg VI

6. MOD13C2: monthly 0.05-deg VI

All MODIS VI products rely on the upstream surface reflectance (MOD09 series) product, which is a daily level (L2) product. The VI algorithms ingest the level 2G surface reflectances and temporally composite these to generate the VI products. The 1-km VI product (MOD13A2), however, must first aggregate 250- and 500-m MODIS pixel sizes to 1 km by way of the MODAGG algorithm. The CMG products, MOD13C1 and MOD13C2, are generated through spatial averaging of the 1-km versions, MOD13A2 and MOD13A3. Both monthly products, MOD13A3 and MOD13C2, are temporal averages of their 16-day versions (Fig. 1).

Figure 1: Overview of MODIS VI product series.

Footnotes

1. Even though we make reference in this document to MODIS VI product as “MOD13” for simplicity, it is implicit that we mean the full MODIS VI product series from both MODIS sensors onboard Terra and Aqua platforms (i.e. MOD13 and MYD13 respectively)