Vegetation

Normalized Difference Vegetation Index (NDVI) images produced from NASA's Land, Atmosphere Near real-time Capability for EOS (LANCE) data are used to monitor vegetation and crop condition. There are several global/regional scale systems in place that report on drought, food shortages and forecasting crop yields including the USGS Famine Early Warning Systems Network (FEWS NET) and Group on Earth Observations (GEO) Global Agricultural Monitoring (GEOGLAM) crop monitor.

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Land Surface Reflectance

In comparison with the MODIS Corrected Reflectance product, the MODIS Land Atmospherically Corrected Surface Reflectance product (MOD09) is a more complete atmospheric correction algorithm that includes aerosol correction, and is designed to derive land surface properties.

Product: Instrument, Platform and Download Link

Description

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MODIS (Aqua) MYD09

MODIS (Terra) MOD09

doi: 10.5067/MODIS/MYD09.NRT.006 (Aqua) and doi: 10.5067/MODIS/MOD09.NRT.006 (Terra)

More information on MODIS Land Surface Reflectance Products including:

MODIS (Aqua/Terra) Land Surface Reflectance True Color (Bands 1-4-3)
MODIS (Aqua/Terra) Land Surface Reflectance True Color (Bands 7-2-1)
MODIS (Aqua/Terra) Land Surface Reflectance True Color (Bands 1-2-1)

VIIRS (Suomi-NPP)
VNP09_NRT

VIIRS Land Surface Reflectance
The VIIRS Surface Reflectance provides continuity with the EOS-MODIS Land Surface Reflectance product.The Suomi-NPP/VIIRS surface reflectance products are estimates of surface reflectance in each of the VIIRS reflective bands I1-I3, M1-M5, M7, M8, M10, and M11. Surface reflectance for each moderate-resolution (750m) or imagery-resolution (375m) pixel is retrieved separately for the Level-2 products and is obtained by adjusting top-of-atmosphere reflectance to compensate for atmospheric effects. Corrections are made for the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols. The inputs to the surface reflectance algorithm include top-of-atmosphere reflectance for the VIIRS visible bands (VNP02MOD, VNP02IMG), the VIIRS cloud mask and aerosol product (NPP-CMIP_L2), aerosol optical thickness (NPP_VAOTIP_L2, NPP_VAMIP_L2), and atmospheric data obtained from a reanalysis (surface pressure, atmospheric precipitable water, and ozone concentration). All surface reflectance products are produced for daytime conditions only.

Surface Reflectance Browse imagery

Coming soon

Land Surface Temperature

Land Surface Temperature layer shows the temperature of the land surface in Kelvin (K). This measurement differs from air temperature measurements as it provides the temperature of whatever is on the surface of the earth for example, bare sand in the desert, ice and snow covered area, a leaf covered tree canopy and even the temperature of man-made buildings and roads. Land Surface Temperature is useful for monitoring changes in weather and climate patterns and used in agriculture to allow farmers to evaluate water requirements for wheat, or determine frost damage in orange groves.

Product: Instrument, Platform and Download Link

Description

Browse imagery in Worldview

MODIS (Terra) MOD11_L2

MODIS (Aqua) MYD11_L2

MODIS Land Surface Temperature and Emissivity

The MODIS Land Surface Temperature and Emissivity (LST&E) product is available from both Terra and Aqua satellites. The sensor and imagery resolution is 1 km, and the temporal resolution is daily.

doi: 10.5067/MODIS/MOD11_L2.NRT.006 and doi: 10.5067/MODIS/MYD11_L2.NRT.006

Land Surface Temp (Day/Night)

VIIRS (Suomi-NPP) VNP21_NRT

VIIRS Land Surface Temperature and Emissivity
VIIRS/Suomi-NPP Land Surface Temperature and Emissivity 6-Min L2 Swath 750m NRT products doi: 10.5067/VIIRS/VNP21_NRT.001

Coming soon. Browse in LANCE-MODIS

Snow Cover

The MODIS snow cover layer shows the presence of snow cover over land and water bodies as an index related to the presence of snow. It is based on a Normalized Difference Snow Cover Index (NDSI) that is derived from the cloud free snow reflectance sensed by the MODIS instrument, and hence this layer shows presence of snow during day time and under cloud clear condition only. NDSI snow cover though could be retrieved in the valid range of (0, 1.0) at every pixel, additional tests like surface temperature screening linked with the surface height is used for accurate detection. Snow is precipitation that forms from water vapor in the atmosphere where temperatures are below 0° Celsius. If the ground temperature is also below freezing, snow will accumulate on the ground as bright, white layer of snowpack. Snow cover reflects sunlight back into the atmosphere, helping to cool the Earth’s surface. Snowmelt is used for drinking water, water for crop irrigation, and can moisturize soil to reduce the risk of wildfire in many areas in the world. When snow melts in the spring, too much snow can cause springtime flooding.

Product and Download Link

Description

Browse imagery in Worldview

MODIS (Terra) MOD10_L2

MODIS (Aqua) MYD10_L2

MODIS Snow Cover

The MODIS Snow Cover layer is available from both the Terra and Aqua satellites. The sensor and imagery resolution is 500 m and the temporal resolution is daily. DOI: doi: 10.5067/MODIS/MOD10_L2.NRT.006 and doi: 10.5067/MODIS/MYD10_L2.NRT.006

MODIS Snow Cover

NDVI Shows Greening Up in Queensland — NDVI from MODIS Terra, over Queensland after heavy rains

Visualize NRT data related to Vegetation in Worldview

Read more about monitoring vegetation from NASA's Earth Observatory.

Last Updated: Aug 2, 2019 at 2:51 PM EDT