Wxtoimg color thermal pallette noaa
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- #Wxtoimg color thermal pallette noaa full#
- #Wxtoimg color thermal pallette noaa pro#
- #Wxtoimg color thermal pallette noaa code#
The remapping kernel is itself the result of some math to take the sample data and match it to the grid of pixels - samples are smaller than pixels by just a little bit, so the kernel is different from pixel to pixel. The remapping kernel is a normalized 4x4 grid that is (sic) takes 4x4 samples from the raw data and gives them weights and adds them together. “The white/cold pixel you are seeing is not a fire pixel, it is a non-fire (or almost non-fire) pixel adjacent to the fire, 2 pixels away from a very, very hot pixel. To inquire about this, I wrote to Chris Schmidt, leader of the CIMSS Biomass Burning Group at UW-Madison and an expert on the Wildfire Automated Biomass Burning Algorithm (WFABBA) which is being adapted to the GOES-R ABI. However, in typical channel 7 imagery, lighter pixels should correspond with colder temperatures. When the fires were at their hottest in channel 7 some pixels near the fires seemed to turn from black to white. The frames have been scaled up 400% for visibility. In channel 7 imagery, darker pixels are hotter. On the left is Band 2 of the Advanced Baseline Imager (ABI), the visible red light band, and on the right is ABI Band 7, an infrared band sensitive to surface temperature anomalies. This video, made with HRIT imagery from GOES-16, shows the extremely rapid spreading of the fires between October 8th and October 11th. Most of the deaths are thought to have occurred when the fires first started overnight between October 8th and October 9th.
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#Wxtoimg color thermal pallette noaa code#
It is unknown why raising the limit allowed this resolution when it did not before.) A Docker image for FFmpeg was used with this script and code changes to the FFmpeg source.īetween October 8th and October 31st 2017, a series of wildfires affected over 200,000 acres in Northern California and killed 44 people. Before scaling down to 4K, the resolution within the FFmpeg filter chain is 46080x25920. This allowed for the 5424x5424 images to be scaled up by a factor of 4 and then padded with black to give the illusion of the Earth floating in space while zooming in and out. In addition, the arbitrary zoom limit of 10 in zoomfilter was raised to 100 in l ibavfilter/vf_zoompan.c.
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INT_MAX was changed to INT64_MAX in libavutil/imgutils.c of the FFmpeg source. It was found that FFmpeg was arbitrarily limiting the global maximum image size to INT_MAX even when compiling for 64 bits. Using ProRes 4444 allowed the rendering of this native resolution but FFmpeg could not scale it up much higher.
#Wxtoimg color thermal pallette noaa full#
This posed a problem as the HRIT full disks were already 5424x5424 pixels. The recommended workaround for this is to scale up the clip as much as possible before passing it to zoompan. The result is that the rate of zoom appears constant throughout the entire animation, whereas without the exponential interpolation the zoom would appear to start slowly at the first frame and end very quickly at the last.īecause the zoompan filter of FFmpeg rounds up or down the x and y values of the frame position, there can be a stuttering effect as the clip is moved. It produces a exponential zoom-out effect interpolating between the first and last frame. The first and last shots use the zoompan filter of FFmpeg following the function (exp(log($ZOOMFACTOR)+(log(1)-log($ZOOMFACTOR))*$FRAME/$TOTALFRAMES)) where the $ZOOMFACTOR is set to 16, $FRAME is the current frame in the video (”on” is used to denote this in FFmpeg) and $TOTALFRAMES is the total number of frames in the video to be zoomed. The first shot is of ABI channel 07 with a histogram equalization applied via ImageMagick and the rest are unedited false color images made from channels 02 and 13 with a color lookup table.
#Wxtoimg color thermal pallette noaa pro#
Adobe Premiere Pro CC was used to crop the full disk footage and speed it up by 2x. Full disk images between T0500Z and T0430Z were decoded with goesdump and rendered into ProRes 4444 video at 10 FPS. In addition, we have entered the spring eclipse season for GOES-EAST which causes stray beams of light to enter the Earth disk at local midnight.īash scripts were used to manipulate imagery from direct readout using ImageMagick and FFmpeg with a GNU Parallel semaphore for parallel processing. Full disk CMIPs for ABI channels 02, 07, and 13 were received despite multiple NOAA HRIT ground system anomalies causing degraded CMI products and data loss stemming from a firewall reboot. It is typical for one or more frames to be dropped throughout a 24 hour period due to any number of issues at any point along the data path. For the first time at the WX-STAR station, 7 days of continuous GOES-16 imagery has been recorded across multiple spectral bands over HRIT.