#GRID FIELD TYPE ARCCATALOG PRO#
#GRID FIELD TYPE ARCCATALOG SOFTWARE#
#GRID FIELD TYPE ARCCATALOG DOWNLOAD#

If you don’t have any data of your own but want to follow along, you can download the Minard-based dataset seen above here. Lastly, you’ll need all your data to be projected, ideally in the same projection as your data frame.An impassable feature class, if you will. Optionally, a feature class which you would like the lines to avoid.Basically anything you could use to make a choropleth or graduated symbol map you can use to make a flow map. A destination feature class containing all destinations and a Z-value attribute (any features with a Z-value of null or zero will be discarded).

A source feature class containing one single feature.

Once you’ve downloaded it, the first step before running the tool is making sure your data is suitable. If you’d like to generate some flow maps yourself, you can download my tool here. Here’s another example, showing migration from California in 2010:Īgain, this is the raw output. See below for information about how this raw output can be improved. This is without any finessing - just the raw output of the tool. Here’s the output of the tool when run using the data from Minard’s coal export map, seen above: After that, it runs the Flow Accumulation tool to determine the quantity of goods or people upstream of any given pixel, and then converts the output to vector lines (which now have the quantity of upstream goods or people as an attribute). These three rasters are then added together, creating a surface that can be used to determine least-cost paths from the source to the destinations. Next, it creates three Euclidean distance rasters - one based on distance from the source, one based on the destinations, and one based on the grid centroids - and divides them into an equal number of slices, depending on the settings when you run the tool. It then generates a grid using the Create Fishnet tool, which will ultimately give the finished flow lines some structure, and converts that grid to points. How it Worksįirst, the tool takes source and destination features and converts them to points, if they’re not already.

#GRID FIELD TYPE ARCCATALOG SOFTWARE#

Unfortunately, there are no built-in tools in ArcGIS to generate distributive flow maps - the only way to make one with the software currently is to draw and attribute it by hand. A distributive flow map made by Charles Joseph Minard showing coal exports from England in 1864. Distributive flow maps are similar to radial flow maps, but rather than having individual lines from the source to each destination, lines are joined together, only forking once they get close to their destinations. Network flow maps are used to show the quantity of flow over some existing network - transportation and communication networks being the most common. If there are more than a handful of destinations and you still want to show the the quantity of flow, however, the lines overlap too much to discern individual values. Radial flow maps are used to show relationships between one source and many destinations. These maps use lines to symbolize the movement, often varied in width to represent the quantity of the flow, and fall into one of three categories: radial, network, and distributive.

#GRID FIELD TYPE ARCCATALOG PRO#

NOTE March, 2019: An even newer and easier to use version of the this tool is now available for ArcGIS Pro and an updated blog post about using the tool has also been posted.įlow maps are used to show the movement of goods or people from one place to another. This blog post was written by Brad Simantel, a summer intern in the Applications Prototype Lab. Set any other field properties as necessary.Editor: Please refer to this blog posting for an updated distributive flow tool.Click the Type arrow and click the field type.You can make calculations without being in an editing session however, in that case, there is no way to undo the results. Click the Table Options button in the table window.Right-click the table or layer in the table of contents and choose Open Attribute Table.No other users or applications are accessing the data including other ArcMap or ArcCatalog sessions.You're not currently editing the data in ArcMap.You can add or remove fields as long as the following conditions are met: Inside either application you can also use the Add Field geoprocessing tool. In ArcMap, you can add a field through the attribute table of a layer or through the Catalog window by accessing the same Properties dialog box and Fields tab. In ArcCatalog, you need to open the layer or table's Properties dialog box and add the field to the list on the Fields tab. You can add fields to your table using ArcCatalog or ArcMap.

Grid field type arccatalog