IRAC: Software: Make subarray mosaics

SPITZER HOME - SPITZER SCIENCE - INSTRUMENTS - SCIENCE USER SUPPORT - SEARCH

General Information
News
Research Categories
Science Schedules
Advisory Groups
Observing Rules
Data Analysis Funding
Exploration Science Program
Legacy Program
First-Look Survey

Observatory & Instruments
Overview
PCS
IRAC
IRS
MIPS
AOTs

Science User Support
Proposal Kit
Documents
Tools
Approved Programs
Observing Schedules

Data Archives & Analysis
Science Archive Access
Post-BCD Tools

Helpdesk / FAQ

How to mosaic subarray data

To mosaic IRAC subarray data, the BCDs which are image cubes of 64 frames need to be transformed into two-dimensional images. MOPEX can then be run to make a final mosaic. This process is described more explicitly in this memo. An IDL procedure irac_subcube_collapse.pro to collapse the 3D subarray data cube to a two-dimensional image is available. In general, the two-dimensional versions of subarray BCDs will not need outlier rejection as that is done through suitable averaging of the 64 frames in each cube. Here is a template namelist mosaic_subarray_basic.nl for the SSC mosaicker that mosaics without outlier rejection.

An example of using the IDL procedure and template name list to make a small subarray mosaic (channel 1 image of Sgr A* from AORid 12074752, pid 3677, PI S. Stolovy). The three panels are the mosaic, coverage map and uncertainty image, from left to right.

This software is not considered part of the pipeline and no installation support from the SSC should be expected. We are however very interested in your feedback in order to improve or replace the algorithm and are glad to work with you in test cases and analysis. Please send your comments to help@spitzer.caltech.edu.

Updated 16 May 07