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What is PNG

Chapter 11

Portable Network Graphics. Image format similar to GIF except that it has been developed more recently and is able to store one of over 16 million of colors per pixel.

Published in Chapter:

Web Map Servers Data Formats

Yurai Núñez-Rodríguez (Queen’s University, Canada)

Source Title: Handbook of Research on Geoinformatics

DOI: 10.4018/978-1-59140-995-3.ch011

Abstract

Web map services, such as Google Maps and MapQuest, are among the most popular sites on the Internet. One can easily access these services through a Web browser on a personal computer or mobile device. The high accessibility and efficiency offered by these sites is possible, in part, by the use of standard image formats. The present review is a description of the most common image formats available from web map servers nowadays, as well as other formats with great possibilities for the future. We describe raster and vector formats and highlight advantages and disadvantages in each case. We also refer to protocols and image formats supported by the Open Geospatial Consortium (OGC) standards.

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