WISE Merge L1b Image Metadata Table

Quick Links

Associated Data Products

Intensity FITS images
Uncertainty FITS images
Mask FITS images
Positions of spurious sources from diffraction spikes
Positions of spurious sources from optical ghosts
Positions of spurious sources from latents
Positions of spurious sources from halos

Overview

WISE Merge L1b (merge_p1bm_frm) contains all Single Exposure Image data sets from AllSky and NEOWISE-R.

The separate collections are AllSky Single Exposure Images (allsky/4band_p1bm_frm), 3-Band Cryo Single Exposure Images (cryo_3band/3band_p1bm_frm), Post-Cryo (2 band) Single Exposure Images (postcryo/2band_p1bm_frm), and NEOWISE-R Single Exposure Images (neowiser/neowiser_p1bm_frm).

Each row in the catalog consists of metadata for a single frame, and is uniquely identified by the scan_id, frame_num, and band columns.

The image_set column identifies the data set collection with values (in parentheses): AllSky(4), 3-Band(3), Post-Cryo(2), and NEOWISE-R(6, 7, 8, etc. incrementing yearly starting with Year 1 beginning 13 Dec 2013).

Metadata queries can be issued at the following URL:

<server><root>/search/wise/merge/merge_p1bm_frm?<parameters>

For example, <root>/search/wise/merge/merge_p1bm_frm?POS=0,0 returns metadata for images containing (RA,Dec) = (0, 0). Query parameters are documented here.

Generating URLs for data products

WISE Merge Level 1b data product URLs are built using the values of the scangrp, scan_id, frame_num, and band columns. Note that the last 2 characters of a scan_id yields the corresponding scangrp, so the latter column is not strictly necessary when building URLs.

Note: MD5 checksums for all data products are stored. Checksum URLs are obtained by simply appending ".md5" to the data product URL.

Intensity FITS images

These are located at:

<server><root>/data/wise/merge/merge_p1bm_frm/{scangrp:s}/{scan_id:s}/{frame_num:03d}/{scan_id:s}{frame_num:03d}-w{band:1d}-int-1b.fits

Examples:

By appending center and size parameters (e.g. <root>/data/wise/merge/merge_p1bm_frm/8b/02328b/152/02328b152-w1-int-1b.fits?center=245.172186354079,-47.171606116143&size=200pix), one can also download cutouts (see the detailed documentation).

Python code to build a URL:

params = { 'scan_id': '00717b',
           'frame_num': 102,
           'band': 2,
         }
params['scangrp'] = params['scan_id'][-2:]
path = str.format(
    '{scangrp:s}/{scan_id:s}/{frame_num:03d}/{scan_id:s}{frame_num:03d}-w{band:1d}-int-1b.fits',
    **params)
url = 'serverroot/data/wise/merge/merge_p1bm_frm/' + path

C code to build a URL:

char url[256];
const char *scan_id = "00717b";
const char *server = "serverroot";
int frame_num = 102;
int band = 2;
snprintf(url, sizeof(url),
         "%s/data/wise/merge/merge_p1bm_frm/%s/%s/%03d/%s%03d-w%1d-int-1b.fits",
         server, scan_id + (strlen(scan_id) - 2), scan_id, frame_num,
         scan_id, frame_num, band);

Java code to build a URL:

String scan_id = "00717b";
String server = "serverroot";
int frame_num = 102;
int band = 2;
String url = String.format("%1$s/data/wise/merge/merge_p1bm_frm/%2$s/%3$s/%4$03d/%3$s%4$03d-w%5$1d-int-1b.fits",
                           server, scan_id.substring(scan_id.length() - 2), scan_id, frame_num, band);

Uncertainty FITS images

These are located at:

<server><root>/data/wise/merge/merge_p1bm_frm/{scangrp:s}/{scan_id:s}/{frame_num:03d}/{scan_id:s}{frame_num:03d}-w{band:1d}-unc-1b.fits.gz

Examples:

Append center and size parameters to these URLs to download a cutout instead of a full image (see the cutouts documentation).