Normalized Multi-band Drought Index for Douro Valley based on MODIS

<p><strong>Normalized Multi-band Drought Index</strong> (NMDI)&nbsp;calculated using MODIS09 imagery provided by USGS/EROS.The original MODIS09 bands were used as data source and then the nmdi was calculated.&nbsp;</p> <p>NMDI uses the 860 nm channel as the reference; instead of using a single liquid water absorption channel, however, it uses the difference between two liquid water absorption channels centered at 1640 nm and 2130 nm as the soil and vegetation moisture sensitive band. Analysis revealed that by combining information from multiple near infrared, and short wave infrared channels, NMDI has enhanced the sensitivity to drought severity, and is well suited to estimate both soil and vegetation moisture.( <a href="https://agupubs.onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Wang%2C+Lingli">Lingli Wang</a>, 2007)</p> <p><a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007GL031021">https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2007GL031021</a></p> <p>&nbsp;</p> <p>Each compressed file contains the NDVI by years. Internally each file have an ISO TC 211 metadata with a complete geographical description.</p> <p>spatial resolution: 463.313m<br> format: GeoTiff<br> reference system:SR-ORG 6842</p> <p>&nbsp;</p> <p>To easily manage the data, each file follow name structure:</p> <p>YYYYMMDD_medgold_workpackage_AoI_sensor_index.</p> <p>YYYYMMDD: Imagery acquisition date</p> <p>medgold: Project name</p> <p>sensor: sensor name</p> <p>workpackage: sectorial workpackage name ( WP2 - Olive Oil Sector, WP3 &ndash; Wine Grape sector, WP4- &nbsp;Durum wheat pasta sector)</p> <p>Aoi: Andalusia, Douro Valley.</p> <p>Index: NDVI, NMDI, NDWI</p> <p>Example:</p> <p>20000218_medgold_wp3_douro_MOD09A1_nmdi</p>