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Cutout

A multi-band cutout routine for Data Central objects

The cutout service is a multi-band image cutout routine for all imaging hosted at Data Central. Generate single band or rgb images, overplot contours, customize plotting options and download pngs/fits for multiple sources/positions.

Submit either source list / RA and Dec / uploaded file

Enter a source name or list of names (separated by a comma).

Filter by data release (optional). Leave blank to search all data releases.

Right Ascension. Format is as: 10.2345d (degrees with 'd' abbreviation for degrees) or 1:2:30.43d (sexagesimal degrees). See the docs for other supported formats.

Declination. Format is as: -0.2716d (degrees with 'd' abbreviation for degrees) or -0d16m17.6s (degree arcmin arcsec). See the docs for other supported formats.

Upload a file containing one (source names) or two (ra, dec) columns (comma-separated), as per the format in the fields above. Accepted file formats: .ascii, .txt, .text. Max file length: 2000 rows.

If RA, Dec or an uploaded list of RA, Dec has been provided, specify the frame of the coordinates. Note, this is ignored if you have supplied a source list.

If RA, Dec or an uploaded list of RA, Dec has been provided, specify the equinox of the coordinates. Valid values are b1950 and j2000 (default)

Minimum value = 5", maximum value = 18000" (600" for optical data). Warning values above 300" will take some time.

Make single-band (greyscale) images for the source list/positions.

To select multiple bands, hold down cmd (⌘) or ctrl and click. To select a block of bands, click one band, hold shift and click another band.

Make a three-colour (rgb) image at each source/position.

Band for r. Suggestion: WISE W1

Band for g. Suggestion: VIKING H

Band for b. Suggestion: SDSS i

If greyscale is yes, choose the scaling to apply to the image.

If greyscale is yes, the low limit to clip the data at. Min 0.0, must be less than hicut.

If greyscale is yes, the high limit to clip the data at. Max 1.0, must be greater than locut.

A number to multiply the data by before applying the scaling.

Basic = x/y axes drawn. None = no axes drawn.

Select the colour map to display the image.

Invert the colour map.

Overlay the contoured data of a specified band.

Specify a hex colour

Specify the contour levels (separated by a comma).

Include (auto-generated) titles on output plots displaying source ID and band(s).

Overlay central (source) position.

Overlay coordinate grid

Overlay source positions from the input catalogue of a data release. To select multiple catalogues; mac users hold down command (⌘) and click, windows/linux users hold down ctrl and click.

Overlay results from remote VO source catalogues. Max 3 services. To select multiple catalogues; mac users hold down command (⌘) and click, windows/linux users hold down ctrl and click.

Overlay survey ID from relevant survey (displays only if plot source positions has a value).

Add legend (displays only if plot source positions has a value). Warning, for large radii and dense fields, this can take some time.

Choose the axes units

Also generate fits files for download.

Add this request to the queue. Data Central will process your request in the background and send an email (if provided) when the request is complete.

If run_async is checked, receive an email when the request is complete. If this is left blank you will need to make a note of the request id manually.


Submit or Queue?
Checking the Add to the queue* checkbox above will add your request to the queue to be processed. You will receive an email when your request is complete. Typically, quick-look requests can be run instantly (leave the checkbox unchecked), but for larger requests (~10+ sources, 6+ bands, contouring) we recommend sending it to the queue! You can read more in the cutout documentation.

Using the Image Cutout

The cutout currently hosts data for GAMA G09, G12, G15 and G23, DEVILS D10 (see the GAMA and DEVILS documentation for the corresponding region centers), KiDS DR4 (see the KiDS website for a list of observations), and GLEAM-X (see the GLEAM-X website for more information).

Submit a source name (e.g., 202627), optionally specifying data releases to query from the Data Release(s) box. For example, if you enter 24433 in the Source List box, and do not select anything in the Data Release(s) box, you will retrieve images for the coordinates at 24433 in SAMI DR2 as well as images at the coordinates of source 24433 in GAMA DR2. Alternatively, submit an RA, Dec position, or upload a list of source names or positions.

You can create single band (greyscale) images, and/or combine bands to create a publication-ready RGB image. The cutout has options for tweaking the image scaling and plot output, overlaying contoured data and source positions for remote datasets, and outputting fits files for download.

If your query is large, send it to the queue and we'll email you when the result is ready to view and download.

Finally, image cutouts may also be accessed programmatically using our Simple Image Access service. The SIA Examples page contains several example Python scripts.

Links

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