Proper Motion Tutorial
How do I get Flags and Proper Motion for a List of Targets?
Obtain flags and proper motion
The following procedure outlines how to use the CAS Imaging Query Server (IQS) to obtain flags and proper motion for a list of targets.
- Access the SDSS Imaging Query Server (IQS).
- Select whether you want html output to look at the results in your browser, or csv output to save them to a file which you can later upload to the Data Archive Server to retrieve images or spectra.
- In the Imaging parameters window, select the list of parameters you want. If you will be using the results to collect data from the DAS, you will need to select the “minimal” set. They are listed by alphabetical order. The list and some explanations are given in the photoObj file description . Flags are described in the photometric flags page. You can select one block of contiguous items by using the usual shift-click, or non-contiguous itmes using ctrl-click.
- In the “Position Constraints” panel you can search a rectangular area, a circular area (Cone Search), or for the closest object only (Proximity Search). For the Proximity Search, your upload file (or the window containing the coordinates) must have as the first line “ra,dec,sep”, and the separation must be specified in arcseconds (max 10). If you specify both an upload file and give coordinates in the window, the upload file will be used.
- In the “Imaging Constraints” you can place constraints based on magnitudes, colors or flags.
- Submit your query
Get fits images
To get fits images, e.g., of your targets:
- Select csv output and save the csv file to disk.
- Go to the DAS imaging data retrieval form.
- Select “All data” for the data release choice, because the CSV generated by the “minimal” columns as instructed above includes the rerun.
- Select the result csv file from above in the “select file to upload” box.
- Click on “Submit Request” at the bottom of the page.
- Under “File types,” select the types of files you want to download (fpC or drC for fits images, for example).
- Since either “wget” or “rsync” under the “Download Selection”section, depending on how you want to download your data.
- Hit the “request” button at the bottom of the page. When queried by your browser, choose where to save the file.
- Follow the instructions in the Interactive download tools section of the DAS home page to download the files you requested.