niomroad.blogg.se - Garmin custom maps

GeoTIFFs – An image format (.tiff/.tif) with georeferencing information embedded.

GeoPDFs – A newer format used to present maps in PDF format.

DOQQ (Digital Orthophoto Quarter Quadrangles) – Digitized aerial photos because of the large file size, each 7.5’ USGS quad is broken into four quadrants.

Usually available as a GeoTIFF, GeoPDF or.

DRG (Digital raster graphic) – A typical digital format for a scanned topo map.

DEM (Digital elevation model) – A dataset of elevation points these are not needed for making custom raster maps, so you can safely ignore them for this purpose.

Examples include Garmin Topo and City Navigator products. These require much less memory than raster graphics. Vector maps – These are made up of lines, points and polygons these are datasets and not images, though they are used to create the map on your GPS screen.They require more memory and computing resources than… Raster maps – These are image files (USGS topo maps, aerial photos, etc.) this is what we’re using to make these custom maps.But first, let’s look at some of the acronyms and terms you’re bound to come across as you delve into this… Terminology

To get you up and running faster, I’ve posted a list of sources for aerial imagery and various types of maps below. The process for adding aerial photos and topo maps is simple enough, once you find the imagery. Just don’t expect those people standing around the Jefferson Memorial to be in the same place when you visit! There are a lot of new map makers out there now that Garmin has opened the door to custom maps on their latest generation handhelds.Īnd the results are cool.