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Category Archives: Discussion
SkyView V3.2.0: Survey descriptions downloaded on demand
The biggest change in v3.2.0 of SkyView is that survey description files are no longer part of the SkyView jar. In v3.1.21 we added a small file that retained the mapping between survey names and the description files they referred … Continue reading
SkyView v3.2.0: Some survey data removed from jar
SkyView-in-a-Jar users will note that the new v3.2.0 SkyView jar is much smaller than the earlier versions, under 4 megabytes compared to over 15 megabytes for v3.1.21. Part of the reason is that the way we access some older surveys … Continue reading
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Tagged releases, SkyView-in-a-Jar, survey description files, surveys, v3.2.0
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IRAS image of Saturn
We have had a lot of interest in images centered on coordinates 13h 45m 18.2s, -08d 13m 07s recently. SkyView images of this area in the sky using the Infrared Astronomical Satellite (IRAS) survey are often added to the SkyView Image … Continue reading
Lanczos Normalization Error
The Lanczos sampler is a truncated version of the optimal sampling function, sinc(x). The kernel of this sampler is given as f(x) = sinc(pi x) sinc(pi x/n) |x| < n 0 |x| >= n Here x is given in … Continue reading
SkyView V3.1.14: VLA FIRST (1.4 GHz) survey update
SkyView version 3.1.14 has been released with a change that affects FIRST survey images. It was brought to our attention that some FIRST images generated using SkyView differed from images generated via the FIRST web server. We investigated and found … Continue reading
V3.1.10: WISE now uses All-WISE data
We’re getting ready to release the next version of SkyView. The only significant change is an update to the WISE datasets which will now point to the All-WISE data release. This provides significantly deeper coverage in some areas and bands … Continue reading
Looking for Moving Targets? Try SkyMorph
One of the restrictions on SkyView is that you need to specify a fixed position in the sky to look at. For many years the SkyView machine has hosted a companion service, SkyMorph, that allows you to look for many … Continue reading
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
V3.1.7: SkyView and Google Analytics
Today we will be releasing version 3.1.7 of SkyView. There are no changes to the user code, but the primary pages will now be instrumented so that usage will be tracked through Google Analytics. This implements the NASA general policy … Continue reading
V3.1.6: RGB Images Bug Fix
The survey descriptions for a number of our surveys (notably including some of the DSS surveys and the IRAS and IRIS surveys) had an error in them that made it impossible to create RGB images if one of the affected … Continue reading