It is really nice to see these high-resolution terrain datasets making it into such a common and easily accessible platform like Google Maps. Presumably these are the data collected by NASA in partnership with USGS in 2003-2004 during a period of significant volcanic activity: Obvious seam between LiDAR grids and lower resolution terrain data north of Yorba Linda, CA:įinally, the very impressive Mount Saint Helens data. I'm not sure of the origin of these data - does anyone know if the original LiDAR point cloud and DEM data are publicly available?: LiDAR bare earth data near Beverly Hills, CA. Note obvious building foundations, hillslope modifications, etc.:Įdge of LiDAR near Washington Park in Portland - bare earth LiDAR on the east side, 10 m (?) data on the west: Data are sourced from the Oregon LiDAR Consortium managed by the Oregon Department of Geology and Mineral Industries (DOGAMI). If you are aware of other areas leave a comment.īelow are a few sites in Google Maps where you can clearly see the high-resolution data.ĭowntown Portland, OR. There may be other examples of LiDAR-derived terrain in Google Maps since I haven't searched very hard. Thus far, I've noticed high-resolution data in downtown Portland, OR, the greater Los Angeles area, and Mount Saint Helens in Washington. Based on the location of these patches of high-resolution terrain, and their appearance, it is pretty easy to deduce that Google is now incorporating bare earth LiDAR digital elevation models into the Google Maps terrain layer. These higher-resolution data are localized, and are patched into the terrain layer among the standard 10 and 30 m derived images, but they are impressive when you find them. Recently however, I've begun to notice higher resolution data in the Google Maps terrain layer. Globally the terrain data appear to be derived from either Shuttle Radar Topography Mission (SRTM) data or something like the NOAA Global Land One-km Base Elevation Project (GLOBE) dataset. Throughout the US, it appears that the terrain layer comes from either 10 or 30 m (1/3 arc-second & 1 arc-second respectively) DEMs from the USGS National Elevation Dataset (NED). Google appears to use a range of digital elevation model data sources to derive the terrain layer. Google has done a nice job generating a visually pleasing terrain layer, and we use it for all of our Google Maps-based interfaces in OpenTopography. If you already have Google Earth Pro (Desktop) installed on your computer, you can just open the downloaded file and you will be able to fly to your objects.One of my favorite features in Google Maps is the terrain layer, which provides a shaded relief (aka hillshade) view of the topography derived from a digital elevation model. As with any of the export functions, you can also pick and choose which objects are exported before clicking the final export button. This is a static file, unlike the network link below.Įxport a KML file via the Export menu, then Download KML File this option is available whenever you have data (markers, lines, polygons) on the map. Then you can use Google Earth as you normally would. You can open it in Google Earth and your objects will be listed in the left hand menu and displayed in the viewer. We covered how to produce this file earlier. If you are unfamiliar with Google Earth, visit their help page. There are several pathways to go about this: KML export, KML network link and KMZ super overlays. Objects, on the other hand, do not require a subscription to view in Google Earth. To view base layers in Google Earth, you must have a CalTopo subscription. More Tips for working between CalTopo and Google Earth.The KML Super Overlay for a file-link that will include layers.The KML Network Link for a file-link that will update.Exporting a KML File for a static file.Mutual Aid Incidents (Formerly Events) Quick Guidesīuilt with Grav - The Modern Flat File CMSĪt times you may find it useful - or just fun - to view your route, objects, or CalTopo layers in Google Earth.Critical Skills Training for Mobile Use.Course: CalTopo (SARTopo) for Incident Response.Moving Your Data From Other Mapping Programs.Folders, Bulk Ops, and Data Management in CalTopo.Working with Existing Lines and Polygons.
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