DescriptionPenang Island heightmap ASTGTM2 N05E100 dem.png
English: A heightmap of Penang Island and surrounding islands with contour discontinuities every 100 m, plotted from ASTER Global Digital Elevation Model data at http://step.esa.int/auxdata/dem/SRTMGL1 and coloured as follows:
Alpha channel: Height of 0 m (sea level) is fully transparent, otherwise fully opaque
Green channel: Height normalised from 0 m (value 0) to 816 m (value 255)
Red channel: Height in metres modulo 100
Blue channel: Height in metres divided by 100, then floored
Hence, each point's blue value * 100 + red value gives its height in metres.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
You may select the license of your choice.
Captions
Add a one-line explanation of what this file represents
{{Information |Description ={{en|1=A heightmap of Penang Island and surrounding islands plotted from data from the ASTER GDEM system at http://gdem.ersdac.jspacesystems.or.jp/download.jsp and coloured as follows: * Alpha channel: Height of 0 m (sea...