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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Kiyomi Morino</dc:contributor>
  <dc:contributor>R. Scott Murray</dc:contributor>
  <dc:contributor>John Osterberg</dc:contributor>
  <dc:contributor>Edward P. Glenn</dc:contributor>
  <dc:creator>Pamela L. Nagler</dc:creator>
  <dc:date>2009</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;We used the Enhanced Vegetation Index (EVI) from MODIS to scale evapotranspiration (ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;) over agricultural and riparian areas along the Lower Colorado River in the southwestern US. Ground measurements of ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;&amp;nbsp;by alfalfa, saltcedar, cottonwood and arrowweed were expressed as fraction of potential (reference crop) ET&lt;/span&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;&amp;nbsp;(ET&lt;/span&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;F) then regressed against EVI scaled between bare soil (0) and full vegetation cover (1.0) (EVI*). EVI* values were calculated based on maximum and minimum EVI values from a large set of riparian values in a previous study. A satisfactory relationship was found between crop and riparian plant ET&lt;/span&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;F and EVI*, with an error or uncertainty of about 20% in the mean estimate (mean ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;&amp;nbsp;= 6.2 mm d&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;, RMSE = 1.2 mm d&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;). The equation for ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;&amp;nbsp;was: ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;&amp;nbsp;= 1.22 × ET&lt;/span&gt;&lt;sub&gt;o-BC&lt;/sub&gt;&lt;span&gt;&amp;nbsp;× EVI*, where ET&lt;/span&gt;&lt;sub&gt;o-BC&lt;/sub&gt;&lt;span&gt;&amp;nbsp;is the Blaney Criddle formula for ET&lt;/span&gt;&lt;sub&gt;o&lt;/sub&gt;&lt;span&gt;. This single algorithm applies to all the vegetation types in the study, and offers an alternative to ET&lt;/span&gt;&lt;sub&gt;actual&lt;/sub&gt;&lt;span&gt;&amp;nbsp;estimates that use crop coefficients set by expert opinion, by using an algorithm based on the actual state of the canopy as determined by time-series satellite images.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3390/rs1041273</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>MDPI</dc:publisher>
  <dc:title>An empirical algorithm for estimating agricultural and riparian evapotranspiration using MODIS Enhanced Vegetation Index and ground measurements of ET. I. Description of method</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>