GIS Blog

Tired of those boxy maps?

In this post we look at alternative shapes for data frames to create more professional maps. It was with great pleasure that I learned how to do something new with ArcMap the other day.  It’s increasingly impossible to know everything there is to know about GIS so knowing how to do new things is always…

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Flow Diagrams That Work

We cover executable flow diagrams using ModelBuilder in this post. In a previous post we covered a straightforward example of a quick GIS job that involved Merging and Dissolving 43 input contour shapefiles, then selecting and exporting a subset.  At the end, I flippantly included a flow diagram, reproduced by the magic of science below:…

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An Embarrassment of Contours

This post discusses how a large collection of contour shapefiles were merged together, dissolved and then a subset of contours were selected and exported. Here’s an example of a relatively quick and easy GIS job that frequently comes across my desktop.  Woody from SOLA contacted me with a question about some data he had.  It…

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Where This Is No Elevation

This post covers how elevations for dragonfly observation points data for Vanuatu were sourced from a space shuttle mission in 2000. For creatures that weigh way less than a gram, dragonflies have certainly kept me busy over the years.  We’ve already seen how my colleague, Milen, used some offline maps on his phone to collect…

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Taveuni – An Island Torn in Two

Spatial data of dragonfly observations from the Fijian island of Taveuni posed some interesting mapping problems .  This post covers how we resolved them using a new projection. You may recall an earlier post where we talked about collecting dragonfly sightings across the Pacific.  My colleague, Milen, is quite the dragonfly aficionado and has been…

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Contour Labels Made Not So Easy!

In previous posts we looked at deriving elevation contours and creating index contours for display.  This time we look at the not quite so straightforward task of labeling our contours. So previously we’ve covered how to derive contours from elevation data and then create some nice index contours.  The last piece of this puzzle is…

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Index Contours Made Easy

Index contours help the map reader get a better feel for the topography of an area.  Symbolising index contours is easy to do with a little bit of preparation.  In an earlier post we looked at creating elevation contours: This time we’ll look at how we can better display our contours by symbolising some index…

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Election 2017: Counting on the Maps

This post looks at mapping the results of the 2017 general election with a particular focus on using cartograms to better represent the results. I don’t know about you, but on election night I was looking for some maps.  Sure, a ticker tape of the electorate outcomes across the bottom of the screen was useful,…

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Contours Made Easy

In this post we look at two different ways of creating elevation contours from a DEM.  In one we derive and smooth the contour lines and in the other we smooth the DEM first. One of the most common questions we get here at GIS Central is about creating elevation contours.  It’s not a difficult…

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Droning on…

This post covers some of the outputs from LU’s new Unmanned Aerial Vehicle, or drone. The university recently acquired a new unmanned aerial vehicle (UAV), or as they’re more commonly known, a drone.  It’s an eight-rotor Altus Delta with three sensors: a high-spec Sony camera, a Sequioa multispectral sensor, and a WIRS thermal camera. That’s…

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