Latest Contributions by TimothyHales

Density analysis calculates the number of events or objects across an area. The calculation results reveal where the highest concentration of points is within that area. Did you know that you can also analyze points that represent a value greater than 1? Just because there may be a cluster of points does not necessarily mean that a certain area has the highest concentration. All you need is an attribute with the quantities. The following example shows you how density analysis is performed using attributes with the Point Density tool in ArcGIS Pro 2.2. This map shows the address locations of reported crimes. Each point may represent more than one report. The number of reports is stored in the Reports field in the attribute table. On the Analysis tab, click Tools. In the search box, type Point Density. On the Analysis tab, click Tools. Select your input points. For Population field, select the attribute with the quantity value. Your Point Density geoprocessing pane should look something like this: Set your output raster. The output density raster shows the areas with the highest density based upon the number of reports at each address location. When you compare running the Point Density tool without a population field versus with a population field, you can see the difference in the results. Point density without population Point density with population By adding in the population field, a high-density area becomes more apparent in the northern area of the map. Upon further investigation, that particular area contains a mall, shopping center, and movie theatre—which probably contributes to the higher number of crime reports. Spatial analysis provides the tools you need to make informed decisions. Learning how to use the available tools will help you choose the specific analysis tool that will best meet your particular needs. Are you new to spatial analysis? I suggest that you take a look at the Getting Started with Spatial Analysis web course. This course builds a foundation of knowledge on the six categories of spatial analysis and how they are used in the spatial analysis workflow. Additional information on density analysis can be found in the Calculating Density Using ArcGIS web course. *Note: The data used in this example is fictitious and does not represent real crime data. ... View more

每个行业都有自己的独特的GIS工作流。年代ome of these are as simple as running a tool or two. Others are more complex, involving multiple tools and processes. For each workflow, someone has to spend time working through each step of the process, then repeat the process again (and again) when new projects crop up or data is provided. These manual, repetitive workflows not only cost time, they can also be prone to error. If a step is missed or an error is introduced within any one of the steps, the results can be problematic, to say the least. What if there was a way to repeat your workflow without having to touch every single task? What if you could find a way to save time? You can! Python provides a solution to these issues. Python scripts can help you: Streamline your GIS work. Easily repeat processes on different datasets. Save time by automating a series of complicated steps. But where do you begin? Exactly what tasks can you perform using Python? How can you improve the performance of your current Python scripts? For example, suppose you want a Python script that takes a table of customer locations and creates an outer polygon boundary of those locations. You have been manually drawing a polygon around an XY event layer of the locations each time they are updated, but the process takes a lot of time and is not entirely accurate. You can use Python lists and ArcPy geometry objects to complete this workflow efficiently and accurately. The Python script can be broken down into basic tasks: Define input and output variables. Create a Python list from the table of XY coordinates. Create a multipoint geometry object from the Python list. Use the convexHull() geometry method to create the boundary. Save geometry object of the boundary to a feature class. You can run this script as often as you need by simply modifying the variables. You can also create a Python script tool from it. Would you like to learn how to script your GIS tasks and workflows? Creating Python Scripts for ArcGIS is a new Esri course that takes you from minimal Python knowledge to creating Python scripts that automate a complete workflow . You’ll learn practical Python skills such as how to access and run geoprocessing tools, automate tasks with lists, work directly with GIS data, create Python script tools, and more. If you want to simplify your GIS workflows and get more work done in less time, take a look at the upcoming class schedule. ... View more