[Backport] Align multiple DEMs with TF (#34)

[Jaeyoung-Lim]

Problem Description
This is a backport of #34 to ROS2

[Ryanf55]

Want help fixing merge conflicts?

[Jaeyoung-Lim]

@Ryanf55 I actually need to fix the part where tf seeped into the grid_map_geo library first.

I would like to keep ros dependencies outside grid_map_geo

[Ryanf55]

@Ryanf55 I actually need to fix the part where tf seeped into the grid_map_geo library first.

I would like to keep ros dependencies outside grid_map_geo

Sounds good. If you want to split the package into grid_map_geo_core and grid_map_geo_ros packages, that could work too. It's a common pattern (and used in grid_map).

[Jaeyoung-Lim]

@Ryanf55 This should now allow you to download multiple DEMs and Rviz will show them already aligned.

[Ryanf55]

Nice work! Just had to zoom out a bit from the default location in the rviz config to see both. A few small things to touch up if you want, otherwise LGTM.

[Jaeyoung-Lim]

@Ryanf55 You can actually call davosdorf and dischma_valley that looks like the following

[Jaeyoung-Lim]

@Ryanf55 I have tried to address the review comments! Thanks for having a look!

I would probably ignore the style checks and leave it to #45

[Jaeyoung-Lim]

@Ryanf55 Good to get in?

[Ryanf55]

@Ryanf55 Good to get in?

Looks good!