Difference between revisions of "SHIPsphotLinks"
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* Provide all the references we need to perform photometry and related topics | * Provide all the references we need to perform photometry and related topics | ||
| + | |||
| + | ==Photometry Reference== | ||
| + | * [http://coolwiki.ipac.caltech.edu/index.php/I%27m_ready_to_go_on_to_a_more_advanced_discussion_of_photometry Aperture Photometry Overview] (from Luisa Rebull). | ||
| + | * Summary of Aperture photometry steps (taken from above Overview). | ||
| + | ** '''Once you have calibrated data (ground- or space-based), the basic series of steps for doing aperture photometry are as follows''', with many different options and parameters for each step: | ||
| + | #Detect objects in image, if doing this automatically (human eyes are good at this). | ||
| + | #Determine center of object. | ||
| + | #Determine background -- e.g. determine what the signal would be in the aperture if the star was not there. (Usually means defining an annulus around the object at some distance from it.) | ||
| + | #Summing up the light in the object (define the size of the aperture to use, subtracting off the background). | ||
| + | #Apply aperture corrections, if necessary. | ||
| + | #Check your numbers! | ||
| + | |||
| + | ==PACS Reference== | ||
| + | * [https://nhscsci.ipac.caltech.edu/pacs/docs/PACS_AOT_flyer.pdf PACS summary sheet] | ||
==Photometry Tools== | ==Photometry Tools== | ||
NITARP's own vintage. | NITARP's own vintage. | ||
===APT: Aperture Photometry Tool=== | ===APT: Aperture Photometry Tool=== | ||
| − | : [http://www.aperturephotometry.org/aptool/ | + | : [http://www.aperturephotometry.org/aptool/ www.aperturephotometry.org] |
| + | : [http://coolwiki.ipac.caltech.edu/index.php/Aperture_photometry_using_APT Using APT] | ||
| + | : [http://www.youtube.com/watch?v=_w_5DgB0vKw Youtube Tutorial (by Luisa Rebul)] | ||
| + | |||
| + | ===Feedback for Russ on APT Tool=== | ||
| + | * Overall layout: Here are my recommendations | ||
| + | ** Left panel should be split in three clearly defined segments: (Top) All photometry definition and parameter values. (Middle) Photometry Reporting, including the clever 'snap' button. (Bottom) Image Display controls. | ||
| + | ** Top Panel should be organized in rows. Top row = left as is. 2nd Row: Define photometry parameters. Split as define apertures and background, and photometry setting. 3rd row, 'Recompute Photometry', 'Pick/Zap', 'Save Results' 'List Results, 'Plot Results' buttons. 4th Row: 'Aperture Slice', 'source Scatter', 'Curve of Growth', 'Radial Profile' | ||
| + | * Please allow users to drag the image via the mouse a la Spot, its successors and google. That makes it a lot easier. I realize that you need the left mouse for defining aperture, but this can be a radio button to switch the role of the mosue. While you are at it, you might want to add a third role for the mouse and that is to change the stretch a la ds9. | ||
| + | * Please allow users to zoom the main image as well. Or, I have not figured out how to do it. | ||
| + | * The output photometry file (by default APT.tbl) should have a header listing the photometry parameters used to make the computations. This is a dump of the selections made in 'More Settings' and Aperture definition dialog boxes. Yes, a lot of the info is repeated but still its a good reference. | ||
Latest revision as of 23:23, 9 May 2013
Purpose of this page:
- Provide all the references we need to perform photometry and related topics
Contents
Photometry Reference
- Aperture Photometry Overview (from Luisa Rebull).
- Summary of Aperture photometry steps (taken from above Overview).
- Once you have calibrated data (ground- or space-based), the basic series of steps for doing aperture photometry are as follows, with many different options and parameters for each step:
- Detect objects in image, if doing this automatically (human eyes are good at this).
- Determine center of object.
- Determine background -- e.g. determine what the signal would be in the aperture if the star was not there. (Usually means defining an annulus around the object at some distance from it.)
- Summing up the light in the object (define the size of the aperture to use, subtracting off the background).
- Apply aperture corrections, if necessary.
- Check your numbers!
PACS Reference
Photometry Tools
NITARP's own vintage.
APT: Aperture Photometry Tool
Feedback for Russ on APT Tool
- Overall layout: Here are my recommendations
- Left panel should be split in three clearly defined segments: (Top) All photometry definition and parameter values. (Middle) Photometry Reporting, including the clever 'snap' button. (Bottom) Image Display controls.
- Top Panel should be organized in rows. Top row = left as is. 2nd Row: Define photometry parameters. Split as define apertures and background, and photometry setting. 3rd row, 'Recompute Photometry', 'Pick/Zap', 'Save Results' 'List Results, 'Plot Results' buttons. 4th Row: 'Aperture Slice', 'source Scatter', 'Curve of Growth', 'Radial Profile'
- Please allow users to drag the image via the mouse a la Spot, its successors and google. That makes it a lot easier. I realize that you need the left mouse for defining aperture, but this can be a radio button to switch the role of the mosue. While you are at it, you might want to add a third role for the mouse and that is to change the stretch a la ds9.
- Please allow users to zoom the main image as well. Or, I have not figured out how to do it.
- The output photometry file (by default APT.tbl) should have a header listing the photometry parameters used to make the computations. This is a dump of the selections made in 'More Settings' and Aperture definition dialog boxes. Yes, a lot of the info is repeated but still its a good reference.
