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The WMAP satellite has made available high quality maps of the sky in fivefrequency bands ranging from 22 to 94 GHz, with the main scientific objectiveof studying the anisotropies of the Cosmic Microwave Background (CMB). Thesemaps, however, contain a mixture of emissions from various astrophysicalorigins, superimposed on CMB emission. The objective of the present work is tomake a high resolution CMB map in which contamination by such galactic andextra-galactic foregrounds, as well as by instrumental noise, is as low aspossible. The method used is an implementation of a constrained linearcombination of the channels with minimum error variance, and of Wienerfiltering, on a frame of spherical wavelets called needlets, allowing localisedfiltering in both pixel space and harmonic space. We obtain a low contaminationlow noise CMB map at the resolution of the WMAP W channel, which can be usedfor a range of scientific studies. We obtain also a Wiener-filtered versionwith minimal integrated error. The resulting CMB maps offer significantlybetter rejection of galactic foregrounds than previous CMB maps from WMAP data.They can be considered as the most precise full-sky CMB temperature mapsto-date.

A full sky, low foreground, high resolution CMB map from WMAP