November 2010 CfA VO User Group Meeting :: Web apps and portals in the VO

Summary list of operational web applications with group comments/recommendations

Resource Aggregators

CDS Portal

Features

Notes, Tips, and Tricks

User Group Comments

DataScope

Features

Notes, Tips, and Tricks

User Group Comments

Web based Image tools

WESIX

Features

Notes, Tips, and Tricks

User Group Comments

Astrometry.net/Flickr

Features

Notes, Tips, and Tricks

User Group Comments

Broken or Problematic Services

Resource Aggregators

A resource “aggregator” provides responses to inquires such as:  “find me all the data available in the virtual observatory for this object/position.”

CDS Portal

Features
Notes, Tips, and Tricks

to the Target field are the same as URLs like

User Group Comments

DataScope 

Features
Notes, Tips, and Tricks
User Group Comments

Web based Image tools

Web based allow the user to upload their image and respond to inquires like: “correct this image’s world coordinate system” and “find all the sources on this image and return a table cross-matched to other standard catalogs.”

WESIX

Features
Notes, Tips, and Tricks
User Group Comments

Astrometry.net/Flickr

Features
Notes, Tips, and Tricks
User Group Comments


Broken or Problematic Services

WCSFixer (NOAO)

User images and demos all fail with:

“ERROR: Attempt to access undefined local variable `ttbl'. Error while reading login.cl file - may need to rebuild with mkiraf Fatal startup error. CL dies. “

WCS Fixer (Sternberg)

You have to already know where the image is located on the sky.

TableViewer

Same XML file successfully uploaded via a URL fails if uploaded from desktop.

Error encountered. No data table was found”

TableConvertor

Requires an input table to have recognizable object names or positions. Users could never get a table uploaded without hitting this response.

VIM

Visual Integration and Mining.  This service wraps up the STILTS toolkit along with SIA image cutout queries and a web store (“workbench”).  Users immediate reactions included “I have no idea where to start or what to do.” and “Its visually confusing.”

NVO Directory

The tabular results are sometimes not filterable using the column heading boxes. Searches like this return a table that when filtered results in an error popup like:

Error in filtering.  Invalid syntax on field criteria?

For numeric columns use >,>=,=,<,<= or range.

   >30  or  30..50

   The = operator is optional.Character fields support only matchs which mayinclude wildcards (*).   Zwicky        or 3C*273

If no wildcards are specified use =xxx to force

an exact match.  Otherwise all rows matching at

the beginning will match (i.e., '3C' matches '3C273'

ReferenceError: xslt is not defined

when one attempts to filter the columns on strings.  This appears to be somekind of caching problem with the XSLT because it will go away in some cases.

August Muench

4 November 2010