New Online Topo Source
Posted: Tue Jan 24, 2012 7:40 pm
Edit: see page 2 for update on slope analysis tool.
Until recently, there were two major sources for online US topo data: Terraserver and MyTopo. After a lot of hard work assembling 450GB of elevation data and approx. 60k USGS scans (thanks, USGS historical map project!), I'm happy to be able to offer another.
To view and print topo maps, go to http://caltopo.com/map.html. Chrome will make borderless prints at any size you want, Firefox will stick a white border around the print, and IE, well . . . it's IE.
As you use the map, the URL automatically updates; you can use this to send a link to someone. Some examples: Visitor Maps, Aerial w/ Contours, SF circa 1900.
If you go to http://caltopo.com/ and log in, you can also draw on a map and share it with others; for example:
This is just idle drawing, not meant to convey an actual ski route.
The USFS map layer is currently CA-only, but will be expanded to the lower 48 in another week or so. I will try to tackle nationwide historical maps after that. The USGS is still scanning WY, SD, MS, RI, MA, VT, NH and especially FL and LA; these states will get better maps as they become available over the next 9 months.
Note that I also posted about this earlier when the map data was California-only. This was originally developed as a mapping/management program for Wilderness SAR; if you like it, consider giving a donation to my team or your local SAR team.
Until recently, there were two major sources for online US topo data: Terraserver and MyTopo. After a lot of hard work assembling 450GB of elevation data and approx. 60k USGS scans (thanks, USGS historical map project!), I'm happy to be able to offer another.
To view and print topo maps, go to http://caltopo.com/map.html. Chrome will make borderless prints at any size you want, Firefox will stick a white border around the print, and IE, well . . . it's IE.
As you use the map, the URL automatically updates; you can use this to send a link to someone. Some examples: Visitor Maps, Aerial w/ Contours, SF circa 1900.
If you go to http://caltopo.com/ and log in, you can also draw on a map and share it with others; for example:
This is just idle drawing, not meant to convey an actual ski route.
The USFS map layer is currently CA-only, but will be expanded to the lower 48 in another week or so. I will try to tackle nationwide historical maps after that. The USGS is still scanning WY, SD, MS, RI, MA, VT, NH and especially FL and LA; these states will get better maps as they become available over the next 9 months.
Note that I also posted about this earlier when the map data was California-only. This was originally developed as a mapping/management program for Wilderness SAR; if you like it, consider giving a donation to my team or your local SAR team.