ABSTRACT
The value of satellite remote sensing for drought monitoring was –rst realized more than two decades ago with the application of Normalized Difference Vegetation Index (NDVI) data from the Advanced Very High Resolution Radiometer (AVHRR) for assessing the effect of drought on vegetation, as summarized by Anyamba and Tucker
16.1 Introduction .................................................................................................. 389 16.2 Future Opportunities for Space-Based Drought Monitoring........................ 391
16.2.1 Soil Moisture Active Passive ............................................................ 391 16.2.2 Surface Water and Ocean Topography ............................................. 392 16.2.3 GRACE Follow-On and GRACE II ................................................. 392 16.2.4 Visible/Infrared Imager Radiometer Suite ....................................... 393 16.2.5 Landsat Data Continuity Mission ..................................................... 394 16.2.6 Next Generation Geostationary Satellites ........................................ 394 16.2.7 Global Precipitation Mission ............................................................ 395 16.2.8 Other Proposed Sensors .................................................................... 396 16.2.9 Enhancement of Land Data Assimilation Systems
with Remotely Sensed Data .............................................................. 397 16.3 Challenges for the Remote Sensing Community .......................................... 398
16.3.1 Engagement of the User Community................................................ 398 16.3.2 Accuracy Assessment ....................................................................... 399
16.3.2.1 Extended and Near-Real-Time Assessment Campaigns...... 399 16.3.2.2 Consideration of Drought Impacts .....................................400
