Category Archives: ArcGIS Step by Step
Story maps are popular. Their visual, interactive nature makes them a great medium to share interesting information about a place or topic and spark discussion on real-world issues. To make a story map, you start with a web map. There are lots of ways to make a web map and just as many ways to make a story map.
The KISS principle is my preferred approach whenever possible; overcomplicating things makes it hard to get stuff done. I found a simple way to make a web map. Here’s a simple four-step process to craft a story map. Continue reading
While I work at the motherland of GIS services and web maps, I don’t have ArcGIS for Server or even a web server installed on my local machine. Odds are, many of you don’t either. For me, getting set up with a virtual machine configured with all the right software is completely doable…but not done. Things came to a head recently when I wanted to visualize some Excel data on a web map.
Of course, I could bring the Excel data into ArcMap and visualize it there, but I wanted to make a web map so I could easily share it with coworkers who don’t use ArcGIS in their day to day. Continue reading
A previous post covered converting standard annotation to feature-linked annotation—to recap, it cannot be done directly. A recommended workflow when you have standard annotation that you wish were feature-linked is to create an empty feature-linked annotation class, then append the standard annotation features to it (using the Append Annotation Feature Classes tool).
Several readers have wondered, once you have feature-linked annotation in place, what happens when you need to replace the data linked to the annotation? No one wants to repeat the work of setting up annotation if they can avoid it. Can you change which feature class your feature-linked annotation is linked to?
The answer is no. Feature-linked annotation can be associated with only one feature class (the one specified when the feature-linked annotation was created). The feature-linked annotation and the feature class participate in a relationship class that you cannot alter.
Despite this, when you receive new data, there is a way to preserve the annotation. Continue reading
“If you fail to plan, you plan to fail.” This old adage has wide applicability—when you want to lose 10 pounds, be picked for a leadership position, land the perfect job, and on and on. So just like everything else in life, when it comes to GIS analysis, planning pays off. To ensure reliable results, here’s the tried and true process we recommend:
- Frame the question.
- Explore and prepare data.
- Choose analysis methods and tools.
- Perform the analysis.
- Examine and refine results.
Step 2 is arguably the most critical as your final results are only as reliable as the data you start with. Read on for a closer look at exploring and preparing data for an analysis project. Continue reading
Labeling features can be a time-consuming part of creating a map. When you’re dealing with many features, it may seem downright onerous. But there are ways to make the job easier. Consider this illustrative tale.
Week 1: James—smart, ambitious, new on the job—is designated the department map maker. Sam, data technician by day, ink artist by night, tells James about a new dataset with a thousand or so point features that will be used as an operational layer in several high-profile maps produced by the department. The data will be updated weekly and the maps need to be in sync (Sam also suggests a warrior armband to command respect from Marc, the alpha analyst in the group).
In ArcMap, James adds the point layer and turns on dynamic labels, spends time creating label classes and setting scale ranges and formatting the labels in each class appropriately for the map products. He converts the labels to a standard annotation feature class stored in the same geodatabase as the point feature class so the annotation can be reused easily on multiple maps. He then spends several hours painstakingly positioning the annotation until he’s satisfied the map text looks perfect. Marc will be impressed, he thinks (and mulls whether to go for a drink after work to discuss those Aztec jaguar symbols Sam just texted). Continue reading
A lot of questions on a variety of topics are sent to this blog’s e-mail address (that is, to me). The wording varies, but many people are looking for the same information. A selection of popular questions and insightful answers is below. Maybe you’ve wondered about these same things. Read on and you may save yourself some typing and a Send click.
Finding Things in ArcGIS 10
Question: I keep seeing references to the ArcGIS tutorials, where are they? And where is the data needed for the tutorials?
Answer: The tutorials are part of the ArcGIS documentation and are a great (free) resource to get up to speed with the software tools and workflows for completing a wide variety of tasks. At version 10, the tutorials themselves (step-by-step instructions) are topics within the ArcGIS Desktop Help system; they appear as subfolders within the main subject categories. For example, the editing tutorial is located at Professional Library > Data Management > Editing data > Editing tutorial.
The tutorial data is an optional part of the ArcGIS Desktop installation. If selected, the tutorial data installs to C:ArcGISArcTutor (default location). Within the ArcTutor folder, the data is organized into topical subfolders. So the first thing to do is search your system for the ArcTutor folder.
If you don’t find the tutorial data, check with your system administrator or the person who manages ArcGIS installation at your organization to see if the data was installed to a network share. If it wasn’t installed at all, you (or they) can modify the installation from the media (DVD) or the download file to get the data.
Speaking of data… Continue reading
Have you ever explored a map and not found the information you were looking for? The table of contents tells what a feature symbol represents, but that alone may not provide enough information when map users are interacting with a map for a specific purpose.
To access the data associated with a feature, map users can open the layer attribute table or use the Identify tool. When a layer has a lot of attributes that are cryptically named, though, having map users wade through them is not ideal. Yes, you can turn off some table fields, set field aliases, and even create HTML pop-ups, but ArcGIS 10 gives you an easier way to make a map more user-friendly: “smart” MapTips. Continue reading
ArcGIS 10 features user-friendly enhancements for shortcutting some of the clicks involved with performing geoprocessing tasks. Of course, if you know how to write scripts using the new ArcPy site package (or have the time and inclination to learn Python scripting), you’ll find the integration of Python into ArcMap a powerful way to automate geoprocessing workflows (and save yourself and your colleagues a lot of time).
But not everyone is a scripter nor aspires to be. For the non-scripters among you, below are my favorite—simple—timesavers that are built into the default interface at version 10. Continue reading
One of the new features of ArcGIS 10 is the ability to “time-enable” your data in ArcMap. Visualizing how data changes over time provides opportunities for powerful, more in-depth analysis. Using ArcGIS 9.3, you can visualize temporal change by creating an animation. You can still create animations at version 10, but there’s an easy alternative as well.
The example below shows how to use the new tools to visualize piracy-related incidents that occurred between March, 2007 and February, 2009 in and around the Gulf of Aden. Continue reading
The ArcGIS 10 release will include many productivity improvements to help you get your GIS work done faster. But ArcGIS 10 won’t be released until next year—so here are some tips you can try out in ArcMap right away. The 10 shortcuts below can shave milliseconds off common tasks, and hey, milliseconds count when you’re trying to get stuff done. You just may be able to get to lunch five minutes earlier and beat the crowd. That alone is going to save you at least 10 minutes, more if you’re going to Old Ebbitt.
Working with Maps
- To activate a data frame, hold down the Alt key and click the data frame name.
- To create a copy of a layer within the same data frame, hold down the Ctrl key and drag the layer up or down. If multiple layers are selected, you can copy all of them at the same time by Ctrl-dragging. (When dragging a layer into a different data frame, the layer is copied by default. If you want to move a layer to a different data frame, hold down Ctrl while you drag it to the new data frame.)
- Hold down the Alt key and click a layer name to zoom to the extent of that layer.
- Select (click) a layer and press Enter to open its layer properties dialog box.
- Hold down the C key while any tool is active to pan the map. Hold down X to zoom out, and Z to zoom in. This shortcut is especially useful when you need to select features that are geographically disbursed.
Working with Tables
To quickly open a table, hold down the Ctrl key and double-click a layer or table in the Table of Contents; alternatively, select the layer or table and press Ctrl+T.
Outside of an edit session, press the spacebar to select or unselect a row.
Press Ctrl+U to switch (reverse) a selection.
Double-click a field name to sort the field in ascending order. Double-click the field name again to sort in descending order.
Click a field name and press Ctrl+H to turn off (hide) the field. (To display the field again, go to the layer properties dialog box > Fields tab, check the field name, and click OK.)
You can find these tips and many others in the ArcGIS Desktop Help.