![here<\/a>, from](\"https:\/\/www.ssec.wisc.edu\/datacenter\/polar_orbit_tracks\/data\/JPSS-1\/2024\/2024_12_18_353\/NA.gif\"){kind=link}
(base) [scottl@machine NUCAPSData]$ ls -1\nNUCAPS-EDR_v3r2_j01_s202412180937229_e202412180937527_c202412181021100.nc\nNUCAPS-EDR_v3r2_j01_s202412180937549_e202412180938247_c202412181022030.nc\nNUCAPS-EDR_v3r2_j01_s202412180938269_e202412180938567_c202412181021170.nc\nNUCAPS-EDR_v3r2_j01_s202412180938589_e202412180939287_c202412181022310.nc\nNUCAPS-EDR_v3r2_j01_s202412180939309_e202412180940007_c202412181021180.nc\nNUCAPS-EDR_v3r2_j01_s202412180940029_e202412180940327_c202412181021580.nc\nNUCAPS-EDR_v3r2_j01_s202412180940349_e202412180941047_c202412181023480.nc\nNUCAPS-EDR_v3r2_j01_s202412180941069_e202412180941367_c202412181023040.nc\nNUCAPS-EDR_v3r2_j01_s202412180941389_e202412180942087_c202412181023430.nc\nNUCAPS-EDR_v3r2_j01_s202412180942109_e202412180942407_c202412181023470.nc\nNUCAPS-EDR_v3r2_j01_s202412180942429_e202412180943127_c202412181023120.nc\nNUCAPS-EDR_v3r2_j01_s202412180943149_e202412180943447_c202412181023480.nc\n(base) [scottl@machine NUCAPSData]$ \n<\/code><\/pre>\n\n\n\nThe variables that can be displayed using polar2grid and those files is quite long. If you were to download the files, and run the following command: .\/polar2grid.sh -r nucaps -w geotiff --list-products-all -f \/path_to_files\/NUCAPS*.nc <\/code>, you would see the many possibilities. For this blog post, I’m choosing Temperature_802mb and Temperature_596mb. <\/p>\n\n\n\nBy default, polar2grid will rescale the plotted temperatures based on the range it finds. I want to have the same scale used for both levels here, and to do that, I have to tell polar2grid. This is done by adding a cris.yaml<\/code> file into the directory polar2grid_v_3_1\/etc\/polar2grid\/enhancements\/<\/code>, which directory is created as part of the polar2grid install process. The contents of the cris.yaml file that I created are below. I’ve mandated that both 802-mb temperatures and 596-mb temperatures be scaled from 240 to 300 K.<\/p>\n\n\n\n![\"\"](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/Enhancements_cris.yaml_-1.png\")
Contents of the cris.yaml file in the enhancements directory (See Note at bottom)<\/figcaption><\/figure>\n\n\n\nI also want to display these data on a map of my choosing (rather than the native NOAA-20 orbital map). Polar2grid allows a user to define a map with the p2g_grid_helper.sh<\/code> shell script below; the script expects a grid name (CANucaps), a center longitude and latitude (115 W, 35 N), grid spacings in m (4000\/-4000) and grid sizes (960×720). The output here is put into a yaml file.<\/p>\n\n\n\n.\/p2g_grid_helper.sh CANucaps -115.0 35.0 4000 -4000 960 720 > CANucaps.yaml\n<\/code><\/pre>\n\n\n\nNext, I call polar2grid to make imagery, color-enhance it, and add coastlines and a colorbar, shown below.<\/p>\n\n\n\n
..\/polar2grid.sh -r nucaps -w geotiff -p Temperature_802mb Temperature_596mb -g CANucaps --grid-configs .\/CANucaps.yaml -f \/path_to_NUCAPSData\/*\n.\/add_colormap.sh ..\/..\/colormaps\/p2g_sst_palette.txt j01_atms-cris_Temperature_802mb_20241218_093722_CANucaps.tif\n.\/add_colormap.sh ..\/..\/colormaps\/p2g_sst_palette.txt j01_atms-cris_Temperature_596mb_20241218_093722_CANucaps.tif\n.\/add_coastlines.sh --add-coastlines --add-colorbar --colorbar-text-size 16 j01_atms-cris_Temperature_802mb_20241218_093722_CANucaps.tif\n.\/add_coastlines.sh --add-coastlines --add-colorbar --colorbar-text-size 16 j01_atms-cris_Temperature_596mb_20241218_093722_CANucaps.tif\n<\/code><\/pre>\n\n\n\nThe resultant imagery is shown in a toggle below. I didn’t label the imagery, but I hope you can tell which field is 802mb, and which is 596mb! The colorbar automatically scales to the values specified in the cris.yaml<\/code> file.<\/p>\n\n\n\n![\"\"](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/j01_atms-cris_Temperature_802_596mb_20241218_093722_CANucaps_toggle.gif\")
<\/a>NOAA-20 Estimates of Temperature at 802 mb and 596 mb, 0937 UTC on 18 December 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\nNext, I decided I wanted to compute and plot the temperature difference between 802 and 596 mb. That requires additions to two files within the polar2grid distribution. A cris.yaml file is needed in (polar2grid_v_3_1\/etc\/polar2grid\/composites\/), with contents as shown below. I defined the parameter (lapse802_596) as using the DifferenceCompositor<\/code> that requires two fields. Then, in the enhancements directory (polar2grid_v_3_1\/etc\/polar2grid\/enhancements\/) I scaled the field to be between 4 and 25K.<\/p>\n\n\n\n![\"\"](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/composites_cris.yaml_.png\")
Contents of the cris.yaml file in the composites directory<\/figcaption><\/figure>\n\n\n\n![\"\"](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/enhancements_generic.yaml_.png\")
lapse802_596 defined in the generic.yaml file within the enhancements directory<\/figcaption><\/figure>\n\n\n\nIf I ran polar2grid now, and pointed to the NUCAPS data directory, and asked it to –list-products-all — I would see a new possibility! lapse802_596. The three polar2grid calls below,<\/p>\n\n\n\n
.\/polar2grid.sh -r nucaps -w geotiff -p lapse802_596 -g CANucaps –grid-config .\/CANucaps.yaml -f \/path_to_NUCAPSData\/*<\/p>\n\n\n\n
.\/add_colormap.sh ..\/..\/colormaps\/p2g_sst_palette.txt j01_atms-cris_lapse802_596_20241218_093722_CANucaps.tif<\/p>\n\n\n\n
.\/add_coastlines.sh –add-coastlines –add-colorbar –colorbar-text-size 16 j01_atms-cris_lapse802_596_20241218_093722_CANucaps.tif<\/p>\n\n\n\n
The result of those three calls is shown below. The steepest lapse rates are off the coast of California and in northwestern Mexico.<\/p>\n\n\n\n![\"\"](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/j01_atms-cris_lapse802_596_20241218_093722_CANucapsW.png\")
<\/a>NUCAPS Lapse Rates, 802-596 mb, 0937 UTC on 18 December 2024 (Click to enlarge)<\/figcaption><\/figure>\n\n\n\n
\n\n\n\n
![in that one<\/a>, none of the named temperatures (that were mispelled!!) included a name:<\/strong> identifier\/match criterion. As a result, all cris variables (including derived ones!) had the same stretched values in computed color bars. <\/p>\n\n\n\nThanks to Dave Hoese, CIMSS, for helping me figure this out!<\/p>\n","protected":false},"excerpt":{"rendered":"This short tutorial will explain how Polar2Grid can show individual isobaric levels, and also lapse rates (dT\/dp) between two isobaric levels. Polar2Grid is CSPP software designed to process files either from the NOAA NODD (EDR files for NOAA-20 are here; EDR files for NOAA-21 are here) or from Direct Broadcast antenna data streams. Polar2grid creates […]<\/p>\n","protected":false},"author":19,"featured_media":62126,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[78,83,109,39],"tags":[],"class_list":["post-62118","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noaa-20","category-nucaps","category-software","category-training"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/62118","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=62118"}],"version-history":[{"count":9,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/62118\/revisions"}],"predecessor-version":[{"id":64445,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/62118\/revisions\/64445"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media\/62126"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=62118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=62118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=62118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}](\"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-content\/uploads\/sites\/5\/2024\/12\/enhancements_cris.yaml_.png\"){kind=link}