GIS Blog

What’s so primo about the Prime Meridian?

The prime meridian sets the zero point for measuring longitude.  What’s so special about it? The Royal Observatory, Greenwich. https://www.mylondon.news/whats-on/family-kids-news/greenwich-royal-observatory-opening-prices-15205328 In the GIS courses we’ve recently been talking about coordinate systems and their importance in GIS.  They are absolutely fundamental as they allow us to do one of the key things that makes GIS useful:…

Continue Reading

On the Edge

We look at creating a catchment boundary layer using existing data and nice visualisations. So imagine you’re walking along a mountain ridge (like the one shown above from Antarctica – hope you’ve got your thermals on).  When it starts to rain, water flows to one side or the other, depending on where it hits the…

Continue Reading

Met Station Madness

In this post we look at extracting and mapping data from the CliFlo database, with some unanticipated coordinate system detours.   Here at GIS Central we recently had a frustrating problem arise with some data (Ed. not an uncommon thing by any means, almost a daily occurrence).  Postgrad Joseph has been interested in identifying heat islands…

Continue Reading

Waffling On

This is a guest post from Lincoln grad Jennifer Tregurtha.  She covers how to create waffle charts to display multivariate data.  Thanks Jen!  (All images by Jennifer unless noted otherwise.) Learning GIS skills isn’t only useful for passing your uni courses, or being able to make some cool maps to impress your friends; it turns out they’re…

Continue Reading

4

JSON and the Argonauts

We look at extracting data from the Christchurch City Councils SmartView maps. As local government uses maps to make their data more and more available, we’ll look in this post at extracting some useful data from the Christchurch City Councils SmartView maps.  Let start with a quick look at what’s available: You can type in…

Continue Reading

Map Services for the Masses

Here we look at adding web services to a map in Pro. If you live in Selwyn, it’s nice to know that you can go to the web and have a look at the district plan – local government in action.  You can go a step further and look at the maps in their Eplan webmap: Click on what…

Continue Reading

Poor Lost Grid

This post covers importing a raster layer from a text file and tidying it up for analysis using Clip Raster and Con Data can take many different forms, some obvious and easy to work with, others less so.  In this post we look at a special case of a raster layer in the guise of…

Continue Reading

1

The Best Laid Plans

In this post we look at different strategies to approach an analysis plan.  (Updated 26 May with additional comments from a colleague.) We talk a lot about analysis on the GIS Blog and there have been a lot of examples with specific tools and how a particular analyses werecarried out.  This is all (hopefully) good after-the-fact stuff,…

Continue Reading

3D Fun

Some hints on creating 3D features in ArcGIS Pro One of the nice things that ArcGIS Pro does better than previous versions is handling data in 3D.  Using scenes, it’s become a lot easier to put together nice visualisations.  For instance, below I’ve got a viewshed generated from a set of five points that represent…

Continue Reading

Deleting Smokers – Closing the Loop(s)

The last of our series on developing a Python script for some smoking reduction analysis. Long term readers of the GIS Blog (Hi Mum!) may recall a series of posts on the development of a Python script for some analysis.  As part of the smoking reduction analysis I’ve been involved with over the years, we…

Continue Reading

1 2 3 4 5 14