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snippet: MODIS NRT Flood Product (MCDWD): 1-day composite, cloud-shadow masking applied.
summary: MODIS NRT Flood Product (MCDWD): 1-day composite, cloud-shadow masking applied.
accessInformation: National Aeronautics and Space Administration (NASA), Goddard Space Flight Center's (GSFC), LANCE (https://www.earthdata.nasa.gov/data/projects/lance)
thumbnail:
maxScale: 4622324.4343102295
typeKeywords: ["Data","Service","Image Service","ArcGIS Server"]
description: <div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='font-family:inherit; font-weight:bold;'>Dates Available:</span><br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>Last 30 days<br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='font-family:inherit; font-weight:bold;'>Update Frequency:</span></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>Daily</div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='font-family:inherit; font-weight:bold;'><br /></span></div><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-weight:bold;'>Bandwidth Use:</span><br /><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>High - zoom in to reduce loading time<br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><div style='font-family:inherit;'><span style='font-family:inherit; font-weight:bold;'>Suggested Usage:</span></div><div style='font-family:inherit;'>Flood detection and showing areas of surface water inundation.</div></div><br /><span style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; font-weight:bold;'></span><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><span style='font-family:inherit; font-weight:bold;'>Product Information:</span></div><div><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>The MODIS NRT Global Flood product (MCDWD) reports flood and surface water detected by NASA's MODIS optical instrument. This instrument is carried on two NASA satellites, Terra and Aqua, and thus provides twice-daily near-global observations. It is an optical instrument so cannot see through clouds.</span></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>The product is delivered as 1, 2, and 3-day composites. These alternatives are provided to minimize the influence of clouds on the product: clouds will block the satellite view of the surface (potentially causing false-negatives where the product does not detect water), and cloud shadows can be erroneously detected as water (potentially causing false-positives where the product predicts water or flood occurrence when there is none).</span></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>The 1-day product only uses observations from the product date, and will report water if it is detected by any single observation (in general over one day, there will be two observations, one from each satellite).</span></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>The 2- and 3-day products combine observations over the current plus previous day (2-day), or current plus two previous days (3-day), and require multiple water detections before a pixel is marked as water in the output. This can dramatically reduce false-positives from cloud-shadows, and may permit flooding to be observed when clouds move out of the way. But they may also not be as up-to-date as the 1-day product.</span></p><p style='margin-top:0px; margin-bottom:1.5rem; background-image:initial; background-position:initial; background-size:initial; background-repeat:initial; background-attachment:initial; background-origin:initial; background-clip:initial;'><span style='font-family:inherit; font-size:16px; color:black;'>Link to 2-day product: </span><a href='https://maps.disasters.nasa.gov/arcgis/home/item.html?id=f7178cdbcc434ff09538999ab5ce8d83' rel='nofollow ugc' target='_blank'>https://maps.disasters.nasa.gov/arcgis/home/item.html?id=f7178cdbcc434ff09538999ab5ce8d83</a></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>Link to 3-day product: <a href='https://maps.disasters.nasa.gov/arcgis/home/item.html?id=b33741d95e924507b75b334f16ec23f1' rel='nofollow ugc' style='color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;'>https://maps.disasters.nasa.gov/arcgis/home/item.html?id=b33741d95e924507b75b334f16ec23f1</a><br /></span></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><span style='font-family:inherit; color:black;'>Please refer to the User Guide for additional details and notes on usage. It is available on the project website:</span></p><p style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px; margin-top:0px; margin-bottom:1.5rem;'><u><span style='font-family:inherit; color:rgb(70, 120, 134);'><a href='https://www.earthdata.nasa.gov/global-flood-product' rel='nofollow ugc' style='color:rgb(0, 121, 193); text-decoration-line:none; font-family:inherit;'><span style='font-family:inherit; color:rgb(70, 120, 134);'>https://www.earthdata.nasa.gov/global-flood-product</span></a></span></u></p><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b>Resolution:<br /></b>~250 meters</div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><br /></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'><b>Credits:</b></div><div style='font-family:&quot;Avenir Next W01&quot;, &quot;Avenir Next W00&quot;, &quot;Avenir Next&quot;, Avenir, &quot;Helvetica Neue&quot;, sans-serif; font-size:16px;'>National Aeronautics and Space Administration (NASA), Goddard Space Flight Center's (GSFC), LANCE (<font color='#0079c1' style='font-family:inherit;'>https://www.earthdata.nasa.gov/data/projects/lance</font><font style='font-family:inherit;'>)</font></div></div>
licenseInfo: <div style='text-align:Left;'><div><div><p><span>Free and available to public users; Commercial providers; Data is not research grade and should not be used for scientific research. Please note that the research products provided are intended to aid decision making and are not for operational use.</span></p></div></div></div>
catalogPath:
title: MODIS Flood: 1 Day Composite
type: Image Service
url: https://maps.disasters.nasa.gov/ags03
tags: ["NASA Disasters Program","MODIS"]
culture: en-US
name: modis_flood_1_day
guid:
minScale: 2.958287637958547E8
spatialReference: GCS_WGS_1984