Mapbox GL JS visualisation examples

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Okay, now I want to get coding… In the previous posts in this series, we have looked at the intuitive ‘out-of-the-box’ web maps you can configure with little to no coding knowledge, whether that be with CARTO or ArcGIS Online, with differing level of learning curves. This may be all you require and provide a timely and quick web mapping solution, particularly in the latter example, one that is integrated with your organisation’s/personal GIS infrastructure. However, to begin customising and ‘fine-tuning’ your web map to your exact needs, some knowledge or understanding of HTML, CSS, and a web scripting language, like Javascript, is required. IRead More →

ArcGIS Online Sandbox

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So I can make a web map, but I want more control… In my previous post, I introduced you to the world of web maps and how the world of geo web development has become more accessible for wanting to get started straight away in creating web maps with little to no web development skills, thanks to the intuitiveness of sites like CARTO. As explained previously, for many this is maybe all you are looking for or need, but others may want to explore options more integrated into existing offline GIS software, and get involved customisation and coding further. ArcGIS Online – Tailored for all levels IRead More →

Example of Carto Builder

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That web map looks great! Wish I could make one… In some ways, there has maybe not been a better time to be involved in the geospatial and cartographic industry, whether as a profession or as hobby/passing interest. While ‘static’ maps and images of geographical information and data visualisation are still very relevant and useful, the rise of the interactive web map is an increasingly trend which is hitting the ‘mainstream’ more and more, whether it be through maps in current affairs like election maps, or through games or social media (e.g. Pokemon Go! and SnapMap). Therefore, the ability for cartographers and geospatialists to haveRead More →

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Fantastic bit of code and tutorial about aggregating point data for JSON objects using SQL. geomaticblog NOTE: I’ll use CARTO but you can apply all this to any webmapping technology backed by a modern database. Get all the data So we start with the typical use case where we have a one to many relationship like this: Easy peasy, we have a map with many stacked points. From here you can jump to this excellent post by James Milner about dense point maps. My example is not about having thousands of scattered points that at certain zoom levels overlap. Mine is a small set ofRead More →

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So this isn’t strictly a GIS or mapping tool or tip that I thought I’d share, but considering the amount of time and importance of joins, spreadsheets, datasets and databases in the profession, or even outside geospatial work, this little tool called ‘Fuzzy Lookup’ may come in handy. Often when trying to query, search or join up one table to another, or for whatever purpose, VLOOKUP can do just the job, ‘vertically looking up’ one value, in order to display another. If you are new or unfamiliar to VLOOKUP, Debra Dalgleish has an awesome blog, Contextures to help with this and much more even forRead More →

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Whilst at university, as a geography undergraduate, I was used to hearing the old stereotype that my course was all about ‘colouring in’. Part of me wished it was a case of choosing the right crayons… However, a few years down the line, in the world of geospatial analysis, besides all the fascinating analysis we do, sometimes the basics of picking the right colours is indeed important to make output legible and accessible. Although ArcGIS and other GIS packages provide built in colour transitions and symbologies, sometimes, especially with web development, a surprising amount of time can be taken getting colours correct, whether this beRead More →