# Presentation: 281262

## Technologies Used for Customized Dynamic Web Access to a Unique Collection of Arctic Change Time Series

**Technologies Used for Customized Dynamic Web Access to a Unique Collection of Arctic Change Time Series**

- Willa H. Zhu
- James E. Overland
**JISAO/UW - PMEL/NOAA*** *

**American Meteorological Society / IIPS**** January 13-17, 2002, Orlando, FL**

**Notes:**
This presentation will focus on the technologies used for customized dynamic web access to a Unique Collection of Arctic change time series. 

## Background

- The Arctic
- Is one of the least explored, studied and understood places on earth
- The inter-agency _SEARCH_ science plan
- identifies the complex suite of interrelated pan-Arctic changes
- gives them the name “Unaami” (Yup’ik word for “tomorrow”)

**Notes:**
The Arctic ...
SEARCH (Study of Environmental Arctic Change) An interagency science program highlights the importance of recent changes in the Arctic
The complex suite of interrelated pan-Arctic changes have been identified in the SEARCH science plan by the name "Unaami“
(highlights the importance of recent changes in the Arctic)
So a special set of Arctic time series data are collected which is an unique, interdisciplinary, and diverse collection of 
The Unaami data collection consists of ...

## The Unaami Web Site

- Provides information and access to this unique collection of Arctic Time Series
- highly interactive
- many functions for viewing and plotting data and metadata
- The Unaami data collection web access system is described in *AMS IIPS paper 4.11*

-  http://www.unaami.noaa.gov

**Notes:**
A special web site has been built ...
The detail information about Unaami data collection web access has been described ...
My talk today will focus on the technologies implemented in creating the Unaami data collection web access system and back-end time series data management. 

## Web Technologies

- Java Applets/JavaScript
- Provide highly user interactive front-end data selection features
- Dynamic HTML
- JavaScript
- CGI (Perl, C)
- Cascading Style Sheets (CSS)

- Back-end software
- Utilities for web update
- EPIC analyses programs
- PPLUS plotting tools
- MySQL Database
- Store metadata

**Notes:**
Unaami website integrates several modern web technologies
The Java Applets ...
The dynamic HTML ... 
The back-end software
The MySQl Database
I will stress these web implementations later.

Cascading Style Sheets are used to control appearance based on different web browsers.
At the back-end, we used EPIC program for data analyses and PPLUS graphic tool to generate the plots.  
The EPIC/MySQL is used to manage the data and provide easy access to the meta data.

## Backend Data Management

- Data
- Converted into netCDF files
- categorized by data type (e.g. biology, ocean, fisheries, etc.)
- Metadata
- stored in MySQL database
- managed using EPIC software (http://www.epic.noaa.gov)(database structure, data loading, data selecting, etc.)
- Update utilities
- Facilitate addition/removal of time series dataset
- Pre-generate web page components
- Polar stereographic map showing station locations
- Station location and data type color key information
- JavaScript containing metadata

**Notes:**
Let me summarize the backend data management
The Unaami time series datasets are converted into netCDF files
 ... and categorized by their data types
The metadata are stoed in MySQl database
 ... and managed using EPIC software
Utilities are developed to facilitate the dataset update procedure
.. And to pre-generate web page components such as ...

## Overview of functionality

- Data access procedure:

**Notes:**
The data access procedure includes “Select Data”, “Select ...” and “get the results”

## Make quick plot

- Data Selection and Browse

- Show quick info

- Select data for further plotting, listing and downloading

**Notes:**
User can use this page to: 
Show quick info by clicking on a single station
Make quick plot by clicking on a single station
User can also select data for further plotting, listing and downloading

## Java Applets/JavaScript for Data Selection

**Notes:**
Java Applets and JavaScript are implemented for the Data selection page

## Refine Selection / Data Access Use JavaScript

- Get user’s selection from Cookie
- Display the metadata and time range dynamically
- Select/Deselect by
- data type
- region
- Sort the data by
- data type
- region
- start year
- longitude
- Latitude
- Refine selection (retain/delete)

**Notes:**
After initial datasets are selected, the next window lists the metadata of selected datasets.  It offers two functionalities:
Refine Selection
Make data access option
The JavaScript is implemented to 

## Data Access

- Make Stacked Time Series Plot
- Make Single Time Series Plot
- Make Correlation Matrix
- View Data Information
- Display Data in ASCII format
- Download netCDF data files

**Notes:**
Once the final data are selected, use can access data with following choices:

## Results

- CGI (Perl)
- Initiate EPIC program and PPLUS script to generate plots and GIF files
- Generate PostScript files
- Generate HTML
- JavaScript
- Dynamically generate HTML code
- Control user’s selection on GIF and download Postscripts files

- Stacked Time Series Plot

**Notes:**
Here is an example of Stacked Time series plot.
It uses PPLUS graphic package to make the plot
Use can select different GIF pages
Also to download Postscript files for generate publication quality print.

## Results

- Correlation matrix

- CGI (C and Perl)
- Calculate correlation coefficient
- Generate HTML

**Notes:**
Here is an example of Stacked Time series plot.
It uses PPLUS graphic package to make the plot
Use can select different GIF pages
Also to download Postscript files for generate publication quality print.

## Results

- Data Access

- CGI (C and Perl)
- List data (access netCDF)
- List metadata (access the database)
- Great TAR file of netCDF files for downloading
- Generate HTML

**Notes:**
This is example of Data Information list

## Summary

- The Unaami time series data are representative of changes in the Arctic region since 1970.
- Unaami data collection access system
- integrates several modern web technologies for easy, interactive access to this unique collection of time series.
- provides a useful tool for studying and understanding recent atmospheric, oceanic, and terrestrial changes in the Arctic.

## Future Plan

- Data analyses will be included as they are completed.
- The Unaami Data Collection will be expanded to include new time series as they are discovered.

- If you know of any time series that represents any aspect of Arctic change, please contact us:
- Dr. James E. Overland
- NOAA/Pacific Marine Environmental Laboratory
- overland@pmel.noaa.gov
- http://www.unaami.noaa.gov