I recently had a fun question from a student on the Building Custom ArcGIS Server Applications with JavaScript class. He has a busy map service with in excess of 50,000 points on it, and was after some advice as to how to improve performance in a web application he...
One thing that appears to cause more confusion than anything else among beginner users of the ArcGIS Server API for JavaScript is the use of the proxy page and CORS. Let's see if we can clear up that confusion once and for all. Before we get into the actual mechanics...
Important note: A number of people have correctly noted that the directions below don't always display the topo data. I've found in the past that you sometimes have to add the layer a number of times before it will actually display the topos. I'm not sure why this...
Over the years I have taught hundreds of beginning level Python programmers how to automate their ArcGIS geoprocessing tasks. Needless to say I have seen all sorts of errors. But there are some common errors that I see over and over again. So if you're a beginner...
I am happy to announce that my new book Building Web and Mobile ArcGIS Server Applications with JavaScript has been published by Packt Publishing and is available in hard copy and eBook formats. ArcGIS Server is the leading software for developing both web and mobile...
Need to build a GIS website but don't know how to write code? GeoSpatial Training Services is now offering a free self paced, web based course covering CartoDB. Building GIS Web Sites without Programming Using CartoDB is now available as a self-paced online class. A...
Today I'm releasing a free sample chapter from my soon to be published book Programming ArcGIS 10.1 with Python Cookbook. Selecting features from a geographic layer or rows from a standalone attribute table is one of the most common GIS operations. Queries are...
The Geolocation API is one of the most exciting new features of HTML5 for us GIS folk. In this section we’re going to look at how geolocation works, what capabilities it offers us and show how easy it is to build an application to retrieve the users location. What is...
Today we're releasing our latest online class HTML, CSS, and JavaScript for Complete Beginners. And it's completely FREE! This is the perfect, gentle introduction to what can be a complex topic. We are recommending this as a pre-requisite to our HTML/CSS/ JavaScript...
In our last post we introduced the topic of HTML5 for GIS web and mobile developers. This post is a continuation of our HTML5 series of posts. Introduction HTML5 introduces the new concept of ‘semantic markup’. Let’s try and illustrate what we mean by semantic markup...