Category Archives: Documentation

Babylon’s Legacy: Converting Decimal to Sexagesimal

It’s usually convenient to store and process angles and times in some simple decimal value, but we often wish to display them in a conventional sexagesimal notation or allow users to enter values that way. So we need to be … Continue reading

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SkyView Surveys Summary

With the inclusion of multiple GOODS surveys we thought it might be useful to take a look at the overall properties of SkyView surveys. So here’s a summary of what we have in a few graphs. With the addition of … Continue reading

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SkyView updates

We are releasing a new version of SkyView today (2012-06-25). We’ve a separate article on the new INTEGRAL Galactic Plane surveys, but we’ve made some changes that affect many of the survey datasets. For each survey that we support, SkyView … Continue reading

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New Fermi Surveys

We’re pleased to be able to provide a new set of Fermi surveys. Fermi is the highest energy survey in SkyView and heretofore we had been providing two bands of Fermi data, from 100 to 5450 MHz and 5450 MHz … Continue reading

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New ImageFinders and Faster FITS

The GALEX release was accompanied by a few other changes. The one that some users may notice is that for surveys where the data is gzip compressed, SkyView should be a little faster. SkyView was sometimes reading the entire image … Continue reading

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Where is a given pixel?

Included in the skyview.util package are two simple utilities that find the coordinate of a pixel in the image or the pixel corresponding to given coordinates. You can use them as: java -cp skyview.jar skyview.util.CoordsPixel filename.fits 10.3 11.4 to find … Continue reading

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Finding which image was used for each pixel

One of the major functions of SkyView is mosaicking multiple images together. Occasionally you may be interested in finding out which source image was used for a given pixel. The FITS header indicates which images were used somewhere, but normally … Continue reading

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New RASS Diffuse Emission maps

A new survey including seven bands of data from the ROSAT All Sky Survey data has been added to SkyView. The RASS Background 1-7 data show the entire sky in diffuse X-ray emission. Point sources have been subtracted out. This … Continue reading

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Reference Coordinates in Fixed Projections

SkyView treats a number of projections (Aitoff, Cartesian, Sansom-Flamsteed/Sinusoidal) as fixed projections. Regardless of the position you specify, the sky is projected to the plane in the same way. All that your coordinate entry changes is the center of the … Continue reading

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