{"id":31865,"date":"2019-02-15T19:08:16","date_gmt":"2019-02-15T19:08:16","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=31865"},"modified":"2019-02-15T19:12:31","modified_gmt":"2019-02-15T19:12:31","slug":"goes-17-data-fusion-an-example-and-where-to-find-the-data","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/31865","title":{"rendered":"GOES-17 Data Fusion: An example, and where to find the data"},"content":{"rendered":"
\"\"<\/a>

GOES-17 Water Vapor Imagery. 6.19\u00a0\u00b5m (top row), 6.95 \u00b5m (middle row), 7.34 \u00b5m (bottom row); Left Columm:\u00a0 Imagery from the ABI; Right Column:\u00a0 Data Fusion Imagery created using the GOES-17 ABI Band 13 (10.3 \u00b5m) Imagery. Animation from 0902 UTC – 1727 UTC. Data Fusion imagery is not computed for the first or last images. Click to play mp4 animation.<\/p><\/div>\n

The GOES-17 Loop Heat Pipe issue means that certain infrared bands lose data integrity at certain times, times that vary over the course of the year. Late February is a time of year when the impacts on data are very noticeable (This figure<\/a> — from this blog post<\/a> — shows other times of the year when the issue is most noticeable).\u00a0 The Data Fusion process that uses GOES-17 ABI Band 13 imagery (relatively unaffected by the LHP issues) can create approximations of the missing imagery.\u00a0 This allows for qualitative views of those missing bands.<\/p>\n

The animation above (click here<\/a> for an animated gif) shows GOES-17 Water Vapor Channels on the left (6.19 \u00b5m, 6.95 \u00b5m and 7.34 \u00b5m) and GOES-17 Data Fusion images on the right. At the beginning of the animation (0902 UTC), Data Fusion is not implemented; it uses information at 0902 to create subsequent imagery, however. In the first few frames of the animation, the impact of the LHP warming are not apparent. By 1007 UTC<\/a>, however, the GOES-17 Water Vapor Bands are becoming noticeably warmer than the Data Fusion imagery. (An initial signal that LHP issues are starting is a general warming in the imagery). Data dropouts start at 1102 UTC<\/a>, first at 7.34 \u00b5m, then at 6.95 \u00b5m and finally at 6.19 \u00b5m. By 1202 UTC<\/a>, data integrity is lost completely, but Data Fusion maintains a signal that allows a user to qualitatively track features in the image. Shortly after 1500 UTC<\/a>, data starts to reappear, initially mostly at 6.19 \u00b5m, then 6.95 \u00b5m and finally at 7.34 \u00b5m. By 1632 UTC<\/a>, the PACUS (Pacific\/CONUS) image shows data, but it is cooler than the Fused data (Note the cooler cloud top temperatures in all three water vapor bands).<\/p>\n

Warmth going into LHP Data Drop-outs and coolness coming out of LHP Data Drop-outs have been documented in this directory tree<\/a> that compares GOES17 and GOES16 imagery in a region in between the two satellites (a region with similar view angles). The figure below (from here<\/a>, accessible from this website<\/a>) shows that GOES-17 brightness temperatures (in red) are warmer than GOES-16 (in blue) before data loss, and cooler than GOES-16 immediately subsequent to data loss.<\/p>\n

\"\"<\/a>

GOES-17 (red) and GOES-16 (blue) brightness temperatures for an small domain midway between the two sub-satellite points. The GOES-17 6.19 Image at 1552 UTC is also shown (Click to enlarge).<\/p><\/div>\n

Fusion Data (in the form of netCDF files written comforming to mission standards; the netCDF files are readable by SIFT<\/a> and McIDAS-V<\/a>, for example) are available via ADDE from the SSEC Data Center. Send an email here<\/a> for more information. Imagery is also available at the SSEC Data Center via the geo browser<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

The GOES-17 Loop Heat Pipe issue means that certain infrared bands lose data integrity at certain times, times that vary over the course of the year. Late February is a time of year when the impacts on data are very noticeable (This figure — from this blog post — shows other times of the year […]<\/p>\n","protected":false},"author":19,"featured_media":31869,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50,80],"tags":[],"class_list":["post-31865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-calibration","category-goes-17"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/31865","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=31865"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/31865\/revisions"}],"predecessor-version":[{"id":31882,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/31865\/revisions\/31882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/31869"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=31865"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=31865"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=31865"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}