Lack of support for a topographic view

Right now only flat maps are shown.

There is no topographic view, which is very important when viewing gpx routes. Typically when viewing a gpx file one wants to see the elevation lines, etc.

Ideally a satellite view should be supported as well.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: gpxviewer 0.5.2-1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: X-Cinnamon
Date: Sun Oct 22 16:41:00 2017
InstallationDate: Installed on 2016-07-21 (457 days ago)
InstallationMedia: Ubuntu-GNOME 16.10 "Yakkety Yak" - Alpha amd64 (20160718)
PackageArchitecture: all
SourcePackage: gpxviewer
UpgradeStatus: No upgrade log present (probably fresh install)