Day: December 25, 2020

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IFSAR Rat 🐀 Hole

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I’ve gone down the rat hole 🐀 🕳 of trying to figure out and learn about IFSAR digital terrain models that look at the elevation of vegetation and buildings over the digital surface model which looks at the ground. Fascinating stuff, especially if I could calculate tree height and compare against other data.

Generating a 120/240 Volt split phase power supply from an inverter

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Generating a 120/240 Volt split phase power supply from an inverter

There are a couple of ways to set up a split phase 120/240 volt system using an inverter.  The drawing below shows the conventional way where two inverters are paired together in a back to back configuration to work in sync and produce 120/240 volts.  This works fine as long as you have inverters that can be ganged together like this to work in sync.  The main disadvantage of this arrangement is   1) You need two inverters and   2) You can only draw from inverter one to power leg A and inverter two to power Leg B.   If leg B has a lot of load and leg A has none there is no way to get the other inverter to help out, it just sits there.

There is an alternative way of doing this that is more versatile.  It uses a 240 volt inverter in combination with an Autotransformer.  This is what it looks lik

I added additional layers to the KMZ/LeafletJS maps on the blog

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I added additional layers to the KMZ/LeafletJS maps on the blog … 🗺

On the whole, LeafletJS’s API is similar if not in some cases simpler and more straightforward then Google Map.

I have to admit that the feature that allows you to use any WMS map in the background in QGIS is a really neat feature. You can load Forest Service Topos, or any layer from the National Map or state WMS services, automatically onto a map, and easily switch between them. Definitely some neat technology — and it’s free of Google, so you never have to worry about either their servers going down or being charged for overage use.

The only downside I have found so far is that KMZ files tend to render more slowly compared to Google Maps, as Google often does a lot of processing on their servers, compared to LeafletJS which is entirely done on the browser side.