3 Georeference Data Windows

3.1. Overview

The GEOREFERENCE WINDOW is the top level window for browsing and visualization of paleoclimatic data. Up to five GEOREFERENCE WINDOWS may be open at one time.You can specify the geographic area of interest and data to be displayed in a GEOREFERENCE WINDOW through the DATA SELECTION dialog.

3.2. Creating A Georeference Data Window

To open a GEOREFERENCE WINDOW, choose the Create Georeference Window option from the File menu. When you choose Create Georeference Window, the DATA SELECTION dialog appears. The DATA SELECTION dialog allows you to specify the data you wish to browse and visualize.

The Image Name field shows the time-slice data image to be displayed as the background image in the Georeference Window. Mapped time-slice data is an analysis of data for a particular time interval over a specific geographic region. Each time-slice data set covers a category of mapped time-slice data, e.g., climate reconstructions: precipitation, temperature; paleoclimate data: Foraminifera, pol-len; model simulation: temperature, precipitation, sea-level pressure; geography: topography, bathymetry (including paleoreconstructions).

The Change Image... button brings up the CHANGE GEOREFERENCE IMAGE dialog, which lets you choose among the background images provided by PaleoVu.

The Georeference Data Categories list lets you choose the paleoclimate data categories to be browsed and visualized in the GEOREFERENCE WINDOW to be created. You must choose at least one.
Each Georeference Data Category consists of a group of data sites. Each data site has a latitude and longitude specified as part of the data, and data is quantitative or qualitative, e.g., warmer or colder.
A data site is made up of variables. Variables can be point, stratigraphic/time-series, or documen-tary in nature. Georeferenced point data describes a single occurrence of a paleoenvironmental property such as modern elevation. Georeferenced stratigraphic data describes a sequence of layers. Time-series data describes a sequence over time, e.g., tree ring data.
Furthermore, a variable can be reconstructed, a "reconstructed variable" is a quantitative or semi-quantitative climatic variable that has been reconstructed using paleoclimatic proxy data, e.g., temperature, or precipitation can be reconstructed from tree ring proxy data.

The Select Sites With Reconstructed Variables Only checkbox, when checked (turned on), tells PaleoVu to browse and visualize only sites containing reconstructed variables. If left unchecked, all data sites can be browsed and visualized.

The Select Vector Overlays button allows you to optionally select vector overlays and or graticules, i.e., lines of latitude and longitude, to be displayed. You can change the overlays to be displayed from the GEOREFERENCE WINDOW.

The Create Georeference Window button creates the GEOREFERENCE WINDOW. The amount of time PaleoVu requires to generate the GEOREFERENCE WINDOW depends on the complexity of the background image and the number of category sites.

The Georeference Window (continued)