Author Archives: Tom

Features in the Gallery: Don’t look too close.

We recently had a query about features in the image . You can see it in the Gallery. There images seems to have a very sharp but colorful transition between the bottom left and top right, but there are also … Continue reading

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Fermi Survey Files

The survey description files for the Fermi soft and hard surveys were improperly formatted so that users attempting to use the SkyView jar in batch mode would not be able to query these surveys.  The files have been updated in … Continue reading

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SkyView Support for SDSS DR8

We have updated SkyView to use the DR8 release of the Sloan Digital Sky Survey (SDSS). The DR8 includes substantially greater sky coverage and is a major reprocessing of all data in the SDSS. There are a fair number of … Continue reading

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SkyView Fermi LAT Surveys

We have just released two gamma-ray all-sky surveys based upon the Fermi LAT weekly data. Fermi images go much deeper and have somewhat higher resolution than the old EGRET surveys. Fermi is also sensitive to gamma-rays at significantly higher energies, … Continue reading

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Clip resampling of intensive quantities in SkyView

The SkyView web page now has two different options for using the Clip resampler. The clip resampler computes the overlaps between the user image’s output pixels and the original survey pixels and adds up the contributions from each overlap. The … Continue reading

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New Fermi and GALEX surveys soon in SkyView

Over the next week or two we’ll be releasing a new and an updated survey set. The Fermi all-sky data will give us a major new image of the gamma-ray sky. Fermi has higher sensitivity and resolution than the EGRET … Continue reading

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WMAP 7 Year Data Available in SkyView

The WMAP survey has been updated to use the 7 year integrated datasets from the HEASARC/Lambda archive. Previously we had been using the 5 year data. While there are small changes in the pixel values the underlying organization of the … Continue reading

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SkyView moved to new VM architecture

The operational SkyView machines have been moved to a virtualized environment. The numeric IP address for SkyView has been changed to This actually points to a load balancer on top of several virtual machines. The new machines are already … Continue reading

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SkyView on Flickr

A set of beautiful images mostly using RGB overlays from the DSS surveys has been put up at in a SkyView Flickr group. Flickr allows comments and tags on images. Perhaps Flickr is where the SkyView image gallery should go?

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Timeouts for SIA requests.

This morning we ran into a problem where too many SkyView requests were running simultaneously and so we had to reject some image requests. One of the reasons this happens is that SkyView accesses some data from remote services using … Continue reading

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