I’ve recently added two new layers to CalTopo, both built built on government datasets but with homegrown rendering. Northern California burning The fire history layer shows wildfire activity since 2000. There are some regional datasets that go back much further, but this was the best I could find for national coverage. Fires are color-coded by year […]
CalTopo started as a project to provide better maps for search and rescue. As I focused more effort on caltopo.com, the SAR version lagged behind and it became harder to bring new features from CalTopo back to the SAR code. This summer I put a lot of effort into reworking things, and while CalTopo hasn’t […]
I can finally announce the CalTopo Viewfinder (working name), a new page that shows a simulated view for any spot in the lower 48. Play with it today by right-clicking on the map background and choosing “View From Here”, or simply go to caltopo.com/view. The default view is a ground-level wireframe with peak names, which is […]
Viewshed analyses, typically the realm of expensive GIS software, show you all the areas that are visible from a given point. They can be useful for estimating radio effectiveness, planning photographs or simply checking out the view from a high point. CalTopo now supports them in easy, drag-and-drop form. slowly growing list of data analysis […]
Update: Based on user feedback I’ve swapped click-hold and shift-click-hold to better mimic the standard behavior. Freehand drawing is now enabled through shift-click-hold; click-hold will drag the map as usual. CalTopo now supports freehand drawing, allowing you to place lines by moving your mouse rather than individually dropping each point. This required booting Google’s drawing […]
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