Over the years I’ve had a number of users ask for a way to organize markers, lines and polygons within a map. There have also been requests for a way to print only some objects, or to print markers with labels and shapes without, and so on. Today’s post covers a new way to do […]
The past several weeks have seen significant behind-the-scenes performance upgrades to CalTopo, including mass migration of lines and polygons to a more efficient storage format. Some of these changes were not without risk, so if anything looks off, please don’t hesitate to let me know. Only time will tell, but it looks like I’m out […]
Over the past several weeks, I’ve been getting progressively more frequent emails from the Binary Canary monitoring service letting me know that CalTopo was down. It was sometimes unresponsive for extended periods of time, but since it generally came back on its own, I did what any good developer would do and ignored the problem until it […]
I’ve written previously about the MODIS satellites and their constant imaging of the planet; CalTopo’s fire activity layer is derived from their infrared sensors, with a lot of post-processing by the federal government. There’s now a new pair of layers that make use of the visible-spectrum sensors: current and archived MODIS imagery. The Latest MODIS […]
A few years ago, I ran across Dan Cervelli’s excellent Closed Contour map of the Sierra. At the time I was just getting started with CalTopo and learning my way around GIS, and Closed Contour really opened my eyes to the cool stuff you can do with Mapnik. I had no idea it was so […]
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