Selects an audio file for subsequent decoding. It also is used to start the decode process. versionĢ File Menu This menu is used to select the file to decode and the filename when saving images. Normally the receiver volume should be adjusted so the volume shows between 50.0 and 75.0 (see Required Calibration under the Help menu for more details). The rightmost section gives the volume used when decoding the image. It is especially useful when using Partial Decode to determine which part of a signal to decode. This gives the number of seconds into the recording under the cursor. To the right of the temperature indicator is the seconds into recording display. The units of temperature (C, F, or K) may be changed under GUI Options in the Options menu. When displaying NOAA or GOES images, the temperature under the cursor is displayed in this section. Just to right of this is the temperature indication. Next is the distance display, showing the distance from the ground station location to the location under the cursor. Next, to the right, is that latitude and longitude display - when the cursor is over an image that has an associated overlay map this will show the latitude and longitude (WGS84) under the cursor. To the right is the sub-information line, this usually shows the satellite elevation and azimuth along with image coordinates under the cursor, but while recording will show information about the recorded satellite s location, and at certain times other information may be shown. The top status line is divided into a number of sections, the leftmost section shows the current UTC time.
The bottom line indicates the processing that is being performed, shows warnings and sometimes hints. At the bottom of the WXtoImg screen, below the image, are two status lines. For WEFAX images, the digital header information will also be given inparenthesis (when available). For NOAA APT satellites, the two channels will also be given. For APT satellites, the satellite direction of travel, maximum elevation (in degrees above the horizon) and azimuth (E or W) at maximum elevation will be shown when available. When an image is displayed, the information line will display the satellite name or type and the date and time (in UTC) at which the image begins. At the top of the WXtoImg Image screen, above the image, is the information line. This provides an easy means of reviewing a day s (or week s, or month s) satellite passes. Clicking on a thumbnail will open the associated file.
Note that images or audio files manually copied into WXtoImg directories will not be shown. All the other tabs show thumbnails of audio files, raw images, saved images, or animations that were created by WXtoImg. This is where decoded images will be shown and where the image will be displayed while recording. The first tab (Image), is WXtoImg smain display. Upgraded versions will also have Composites, and Animations. 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.