Status and Information Lines Across the top of the WXtoImg display are several tabs (Image, Audio Files, Raw Images, and Saved Images). A burst cycle PLL is used on Meteor and Resurs satellites to correct for doppler shift and to help ensure the images are straight. WXtoImg uses a PLL technique to correct for doppler shift and ensure straight images on NOAA satellites even inthe presence of very high noise levels or poor signal quality. On other satellites, the grayscale and black and white bars are used to adjust the gain. Accurate temperature calibration on IR images is also performed. On GOES satellites, the grayscale is used to correct for non-linearities in signal strength and normalise the image. The telemetry data is also used to calibrate the instruments to provide for very accurate temperature readings. WXtoImg uses the telemetry data on NOAA APT images to very accurately calibrate the image, correct for non-linearities in signal strength, and make adjustments for gain changes across the pass. scanners) although there are limitations on what can be done. WXtoImg attempts to produce reasonable images from receivers which have too narrow an IF bandwidth (e.g. Output is in JPEG, PNG, BMP, PBM (PGM/PPM/PNM), or AVI format. WXtoImg has a built in set of image processing facilities, but can output raw images for further processing. WXtoImg supports both APT transmissions from polar orbiting satellites and WEFAX transmissions from geostationary satellites. Mercator), text overlays, automated web page creation, temperature display, and control for many weather satellite receivers, communications receivers, and scanners. WXtoImg supports map overlays, advanced colour enhancements, 3-D images, animations, multi-pass images, projection transformation (e.g.
1 Introduction WXtoImg is fully automated weather satellite recording, decoding, editing, and viewing software.