This 3-part mini-course is my attempt to explain the basic concepts of working with PostGIS data from within the Leaflet.js mapping API. Technically this is not Leaflet programming. In this scenario Leaflet.js simply becomes the canvas on which your geospatial data is displayed on a web map. All of the interaction with the geospatial data occur through very common and standard methods of working with enterprise level databases, but with a geospatial twist. Continue reading “Working with PostGIS data from within Leaflet.js (or any other client side mapping API)”
This video provides a brief introduction into what a SpatiaLite database is, why you might want to use one, and how to load data and create virtual layers in QGIS 3.0. (If you are using QGIS 2.xx you’ll be able to figure it out as well)
This is one lecture of an entire course on QGIS 3.0 for GIS professionals that will be available on Udemy.com when QGIS 3.0 is released (currently expected Dec 8) so keep an eye out for it if that will interest you.
If you want to learn more, check out What can a spatial database do for you? and Quick start to spatial databases with QGIS and SpatiaLite
In a recent post, I attempted to answer the question What can a spatial database do for you? That post was a broad overview of the advantages of storing your geospatial data in a spatial database. This post follows up with more specific information on how to get started and step by step instructions on using one type, SpatiaLite, with the popular open source GIS software QGIS. Continue reading “Quick start to spatial databases with QGIS and SpatiaLite”
Is spatial really special?
Many GIS professionals come into the field from a specific discipline and become interested in GIS as a tool with which to accomplish their goals in their original field and by attrition or intent begin to shift their focus towards GIS. I followed this path myself. After going to school to study wildlife biology, I learned about GIS and enrolled in a minor program in GIS and spatial analysis. I think that this is a good thing in many ways. People with an interest in solving problems in other disciplines will push the field forward in directions that someone who’s sole focus was on GIS would be unlikely to go. We need those people in the industry.
But GIS is a technical discipline. At its core GIS is database technology, albeit with a spatial focus. In my humble opinion many university GIS departments, especially at the certificate level, focus too much on the “spatial” aspects of GIS and not enough on the underlying database technology. As a result these programs produce GIS professionals who are very good at cartography and spatial analysis but who find themselves unprepared for the modern GIS job market where there is an increasing need for people with skills in enterprise level database administration, SQL, and web-based GIS. Even if they are not performing those tasks themselves, GIS professionals should at least have an understanding of the technology in order to be able to communicate effectively with those who will be performing those tasks. Continue reading “What can a spatial database do for you?”
What is web GIS?
When most people think about web GIS, they think about publishing a map or a data set for the world to see. That’s certainly part of it, but only a small part. For many years when I would try to sell my employers on the concept of web GIS they would reply “We don’t want everyone to see our proprietary information.” After digging in and learning more on my own I began to realize that there was much more to web GIS than publishing content. Continue reading “Why your organization needs a web GIS strategy.”