Groups
Groups
Sign in
Groups
Groups
DECam Legacy Survey
Conversations
About
Send feedback
Help
DECam Legacy Survey
Contact owners and managers
1–30 of 96
Greetings. Please post any questions or comments you have about the DECaLS (Dark Energy Camera Legacy Survey) data products.
Mark all as read
Report group
0 selected
Zack Hutchens
, …
David Schlegel
6
Feb 7
Partial/missing bricks in DR9 phot/pz sweeps
Zack, I just read in + plotted the coordinates for all the sources in those files, which doesn't
unread,
Partial/missing bricks in DR9 phot/pz sweeps
Zack, I just read in + plotted the coordinates for all the sources in those files, which doesn't
Feb 7
Andrew Engel
, …
John Moustakas
7
5/23/25
NERSC cutout service?
Thanks John + Dustin-- So to circle back on this thread for anybody who might find it useful in the
unread,
NERSC cutout service?
Thanks John + Dustin-- So to circle back on this thread for anybody who might find it useful in the
5/23/25
Chris Snell
,
Dustin Lang
3
5/13/25
Login failure on discuss.legacysurvey.org
Thanks! Now to happily replying! I've updated Chrome to the latest version and it seemed to have
unread,
Login failure on discuss.legacysurvey.org
Thanks! Now to happily replying! I've updated Chrome to the latest version and it seemed to have
5/13/25
Juan
,
Dustin Lang
6
3/28/25
Image Cutout Script No Longer Working
Yeah, could be, NERSC network operations does that sometimes when they see what looks like DOS
unread,
Image Cutout Script No Longer Working
Yeah, could be, NERSC network operations does that sometimes when they see what looks like DOS
3/28/25
Yongmin Yoon
, …
Dustin Lang
4
2/13/25
Internal server error (500) when requesting cutout FITS file images
Thanks for your message - this should be working again now. cheers, dustin On Thu, Feb 13, 2025 at 4:
unread,
Internal server error (500) when requesting cutout FITS file images
Thanks for your message - this should be working again now. cheers, dustin On Thu, Feb 13, 2025 at 4:
2/13/25
Renhao Ye
,
Dustin Lang
2
1/18/25
Legacy Survey Server Down?
Yes, we have had some outages lately. I think it's back to normal now. On Sat, Jan 18, 2025 at 10
unread,
Legacy Survey Server Down?
Yes, we have had some outages lately. I think it's back to normal now. On Sat, Jan 18, 2025 at 10
1/18/25
Sagar Sethi
,
Dustin Lang
2
1/6/25
Recreate the DESCaL RGB image in python/astropy
Hi, Here's the code that the viewer uses to make its RGB images: dr2_rgb() takes a list of images
unread,
Recreate the DESCaL RGB image in python/astropy
Hi, Here's the code that the viewer uses to make its RGB images: dr2_rgb() takes a list of images
1/6/25
Alina
, …
Dustin Lang
6
12/21/24
photo-z in particular area
Hi Jesse, Thanks for the example code! That's fantastic. cheers, dustin On Sat, Dec 21, 2024 at 7
unread,
photo-z in particular area
Hi Jesse, Thanks for the example code! That's fantastic. cheers, dustin On Sat, Dec 21, 2024 at 7
12/21/24
Adam Watts
, …
Adam Watts
3
12/12/24
Accessing DR10 inverse variance maps
Legend, thanks! On Thursday, 12 December 2024 at 21:07:46 UTC+8 Dustin Lang wrote: Hi, We call these
unread,
Accessing DR10 inverse variance maps
Legend, thanks! On Thursday, 12 December 2024 at 21:07:46 UTC+8 Dustin Lang wrote: Hi, We call these
12/12/24
asd das
,
Dustin Lang
2
12/3/24
How can I obtain a catalog of mixed stars more efficiently?
Hi, Can you please give at least one example of this working correctly (where it finds what are you
unread,
How can I obtain a catalog of mixed stars more efficiently?
Hi, Can you please give at least one example of this working correctly (where it finds what are you
12/3/24
Emory Murff
,
Dustin Lang
2
11/8/24
Photoz Catalogue
Hi, The "sweep" files for the photo-zs are here, https://portal.nersc.gov/cfs/cosmo/data/
unread,
Photoz Catalogue
Hi, The "sweep" files for the photo-zs are here, https://portal.nersc.gov/cfs/cosmo/data/
11/8/24
asd das
,
Dustin Lang
2
10/18/24
Cutout Service
Hi, Images from the cutout service are resampled from the DR coadded images. If you request the
unread,
Cutout Service
Hi, Images from the cutout service are resampled from the DR coadded images. If you request the
10/18/24
Alina
,
Dustin Lang
4
9/18/24
help to download a catalogue with mags for a particular area
Hi Alina, Glad it worked for you... the Datalab's added-value columns are certainly helpful :) (
unread,
help to download a catalogue with mags for a particular area
Hi Alina, Glad it worked for you... the Datalab's added-value columns are certainly helpful :) (
9/18/24
Sagar Sethi
, …
Chris Cai
6
9/3/24
Download a 1 degree cutout
Thank you very much, I download the fits successfully! 在2024年9月3日星期二 UTC+8 21:55:36<dstn...@gmail.
unread,
Download a 1 degree cutout
Thank you very much, I download the fits successfully! 在2024年9月3日星期二 UTC+8 21:55:36<dstn...@gmail.
9/3/24
Rajnil Mukherjee
,
Dustin Lang
3
7/15/24
Specifics and general query on using DR10 data products for science purposes
Thanks a lot for the quick reply! I will get back to you if I face any further issues! :D Regards,
unread,
Specifics and general query on using DR10 data products for science purposes
Thanks a lot for the quick reply! I will get back to you if I face any further issues! :D Regards,
7/15/24
Dong-Woo Kim
,
Dustin Lang
4
5/17/24
WISE data in ls_dr10.tractor table
Hi Dong-Woo, Thanks for your comments, I agree there are a lot of WISE photometry products around! We
unread,
WISE data in ls_dr10.tractor table
Hi Dong-Woo, Thanks for your comments, I agree there are a lot of WISE photometry products around! We
5/17/24
Daviti Kobaidze
,
Dustin Lang
2
5/16/24
About an image of Legacy Surveys
Hi, This page describes the filters on the Dark Energy Camera, https://noirlab.edu/science/programs/
unread,
About an image of Legacy Surveys
Hi, This page describes the filters on the Dark Energy Camera, https://noirlab.edu/science/programs/
5/16/24
Vasco Cossa
,
Dustin Lang
6
4/26/24
DECaLS DR10 source catalog
Thank you for the answer. That's the same value I got... -- Vasco On Fri, 26 Apr 2024 at 16:43,
unread,
DECaLS DR10 source catalog
Thank you for the answer. That's the same value I got... -- Vasco On Fri, 26 Apr 2024 at 16:43,
4/26/24
Juan Pablo Calderón
4/1/24
Custom photometry on a set of bricks
Hello everyone. We were performing custom sextractor photometry on a set of bricks. If i understood
unread,
Custom photometry on a set of bricks
Hello everyone. We were performing custom sextractor photometry on a set of bricks. If i understood
4/1/24
Jiaxuan Li
,
Dustin Lang
3
3/18/24
DR10 PSF model in i-band
Awesome, thank you so much! On Mon, Mar 18, 2024 at 12:02 PM Dustin Lang <dstn...@gmail.com>
unread,
DR10 PSF model in i-band
Awesome, thank you so much! On Mon, Mar 18, 2024 at 12:02 PM Dustin Lang <dstn...@gmail.com>
3/18/24
Este Padilla Gonzalez
, …
Dustin Lang
4
3/4/24
dr9 parameters
Hi, Unless you're starting from *very* low-level simulations, you really probably don't need
unread,
dr9 parameters
Hi, Unless you're starting from *very* low-level simulations, you really probably don't need
3/4/24
Aina
,
Dustin Lang
2
2/4/24
the zero point magnitude or zero point flux
Hello, The catalog flux_g, flux_r, flux_z values are in units of "nanomaggies" -- a flux of
unread,
the zero point magnitude or zero point flux
Hello, The catalog flux_g, flux_r, flux_z values are in units of "nanomaggies" -- a flux of
2/4/24
eeba...@gmail.com
,
Dustin Lang
2
1/31/24
Documentation for DR10.1 and extras
Hi, The "lightcurves", "extras", and "photo-z" files are described here
unread,
Documentation for DR10.1 and extras
Hi, The "lightcurves", "extras", and "photo-z" files are described here
1/31/24
HANJING SHI
,
Dustin Lang
2
1/24/24
How to convert nanomaggie to counts?
Hi, If you are using cutout images from the Legacy Survey sky viewer, then (if you request cutouts at
unread,
How to convert nanomaggie to counts?
Hi, If you are using cutout images from the Legacy Survey sky viewer, then (if you request cutouts at
1/24/24
Jiachuan Xu
,
Dustin Lang
2
12/28/23
LS Shape Measurement
Hello, The SHAPE_E1,E2 values are the "above-the-atmosphere" intrinsic galaxy ellipticities
unread,
LS Shape Measurement
Hello, The SHAPE_E1,E2 values are the "above-the-atmosphere" intrinsic galaxy ellipticities
12/28/23
Qifeng Huang
11/1/23
Transformations from SDSS to Legacy Surveys Photometry
Hi, I'm working with the i-band images of DR10, and I want to know the conversions between the i-
unread,
Transformations from SDSS to Legacy Surveys Photometry
Hi, I'm working with the i-band images of DR10, and I want to know the conversions between the i-
11/1/23
Imad Pasha
,
Dustin Lang
4
10/16/23
Weights for image combination to roughly match legacy viewer?
Hi Imad, The `dr2_rgb` function wants a list of images, so I think you could do: out = dr2_rgb([im[:,
unread,
Weights for image combination to roughly match legacy viewer?
Hi Imad, The `dr2_rgb` function wants a list of images, so I think you could do: out = dr2_rgb([im[:,
10/16/23
Jiachuan Xu
,
John Moustakas
3
9/29/23
Tractor Catalog Photometry
Some other questions I have about BGS target selection paper https://arxiv.org/abs/2208.08512 - For
unread,
Tractor Catalog Photometry
Some other questions I have about BGS target selection paper https://arxiv.org/abs/2208.08512 - For
9/29/23
ran zhang
,
Rongpu Zhou
2
9/8/23
Photometric redshifts
Hi Ran, The ~0.02 photo-z error that you quoted is for the DESI LRGs. The z_training=False objects
unread,
Photometric redshifts
Hi Ran, The ~0.02 photo-z error that you quoted is for the DESI LRGs. The z_training=False objects
9/8/23
John Winterflood
9/7/23
Legacy DR10 Unique Source Counts
The Legacy DR10 description page (https://www.legacysurvey.org/dr10/description/) lists the total
unread,
Legacy DR10 Unique Source Counts
The Legacy DR10 description page (https://www.legacysurvey.org/dr10/description/) lists the total
9/7/23