Latest Contributions by BryanChastain

I'm trying to call esri/request on a page that requires username/password, but when I do, I get the following error: esri.config.defaults.io.proxyUrl is not set. If making a request to a CORS enabled server, please push the domain into esri.config.defaults.io.corsEnabledServers Error: "Unable to load https://<myserver> status: 0" But if I do add the domain into corsEnabledServers, I get this error: XMLHttpRequest cannot load https://<myserver>. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost' is therefore not allowed access. The response had HTTP status code 401. Error: Unable to load https://<myserver>' status: 0 Any ideas? ... View more

The Problem Anyone who's had to do any sort of scripting with arcpy involving complex repetitive tasks knows how long it can take for it to complete. Even something as simple as exporting a few thousand map documents to images can potentially take hours to run. Part of the reason for this is due to the fact that python, by default, runs in a single thread. A programmer familiar with other languages, such as Java or C++ might have the bright idea to address this inefficiency by using multithreading to share the work among all the CPUs. Unfortunately, multithreading in python does not work in quite the same fashion. CPython, upon which arcpy is built, employs what is known as the Global Interpreter Lock (GIL) to prevent one thread from modifying an object while another thread is working with that object, keeping garbage collection working smoothly. However, the downside to this is that python multithreading scripts cannot take full advantage of all available CPUs, preventing any real gains in speed. The Solution Enter the multiprocessing module. This module employs processes instead of threads, thereby bypassing the GIL. Due to this, programmers are able to fully leverage multiple processors on any given machine, and even though processes have greater overhead than threads, significant gains in speed can be achieved. This presentation will show best practices for using the multiprocessing module with arcpy, and will show examples of how we are currently using multithreading to provide solutions to clients. Co-authors: Brett Gaines​Kelvin Fox​ ... View more

We're just now getting the full functionality of Python in ArcMap via Python Add-Ins, but now everything is moving to ArcGIS Pro and I noticed that there are not any plans to include Python Add-Ins for Pro as well. I do like the new mapping module for Pro, but please also give us the ability to create Add-Ins with Python as well.   ... View more

Looking for an easy way for users to be able to select features interactively by rectangle (e.g. the Select tool in Desktop) and then have some way to modify the styling (say, change the color) of the selected features. The changes would need to be saved too, so can't just do browser-side styling only. Here's an example of the scenario I'm thinking of: Adam and Bob are discussing some parcels. To clarify the discussion, Adam makes a map on AGOL containing a layer of parcel features. He makes the parcels he's referring to show up as blue and sends Bob a link. Bob sees the blue parcels but has a few changes to make, so selects a few additional parcels and changes their color to red. Adam is able to see Bob's changes. What's the easiest way to do this without having to use Desktop? Assume a parcels (or something like it) feature service (or KML, geoJSON, etc) has already been created. ... View more