Mobile version

Saturated color scale

Lively Data : April 16, 2004

Merged (Topex/Poseidon+ERS-1) sea level anomaly global map for October 14, 1992 (Ssalto/Duacs delayed time Maps of Sea Level Anomalies). Up, the map plotted with the automatic color scale: outside very localized points, most heights are between -20 and +20 cm. Middle, same map plotted with (-15,15,1) defined in "fill option" ("output options" section): areas where heights exceed +/-15 cm are blank; bottom, the map plotted by defining (-90)(-15,15,1)(170) in "fill option": height between -15 and -90 cm are in the same purple, those between 15 and 170 cm in the same red.

Altimetric measurements have often very high extreme values, mostly in strong turbulence areas -- typically in the majors currents like Gulf Stream or Kuroshio. A plot of a global map without specification can lead to a nearly uniformly colored map, since typical sea level variations are hidden by the amplitude of the color scale needed to have the extreme values.
The Live Access Server allow to impose color scale minima and maxima, depending on what we wish to see. For major current variations +/-30 cm (or even +/-50 cm) are needed; for El Niño, +/-20 to 25 cm are OK. For the rest of the ocean +/-15 cm are more than enough most of the time. To fix those extrema, we saw (Scaling the ocean - July 7, 2003) that you have to click on "output options", then typing in "fill option": (min, max, interval). But this lead to blank areas, where values exceed the defined extrema. To avoid this, you can type (absolute min)(min, max, interval)(absolute max), where absolute min and max are the map extreme values (or very high ones). Color scale is then saturated.

Use the  Live Access Server

EnglishFrançais
Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!