July 2007 - Posts

Masking Intersection Overshoots that Result from Line Caps

Jerome Parkin, a cartographer at Lovell Johns , recently posed a challenging question on Ask a Cartographer : "It is possible to generalise cased roads? The image shows kinks -- the data is ok but the cartographic representation is kinking the road and Read More...
Posted Thursday, July 26, 2007 1:10 PM by MappingCenterTeam | 0 Comments
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Hot Spot Analysis of 911 Calls Map is Available

The Hot Spot Analysis poster shows the steps in the analysis of 911 Call data. The data were processed using the Hot Spot Analysis tool and the design of the poster is, we think, faithful to the underlying data. I did the first edition of this poster Read More...
Posted Wednesday, July 25, 2007 1:07 PM by MappingCenterTeam | 2 Comments
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Clearly Labeling Overlapping Polygons

Not long ago a colleague wrote me saying she had overlapping polygons that need to be clearly labeled so she'd know to which polygon each label pertains. She sent me the drawing done in PowerPoint of the desired result but wanted it as an automated solution Read More...
Posted Tuesday, July 24, 2007 1:03 PM by MappingCenterTeam | 0 Comments

The Integrate Tool

I dropped a hint about the Integrate tool in the previous post and decided it was worth giving a bit more time to. The way I found out about the Integrate tool was through working on a different problem altogether – I was helping somebody who was trying Read More...
Posted Tuesday, July 17, 2007 12:58 PM by MappingCenterTeam | 1 Comments
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Simplifying lines and polygons that intersect with other lines and polygons

There are quite a few tools in the ArcGIS toolbox that are designed to, and depending on your goal, work well for generalizing a single feature class. The downside to that is many feature classes of data can be required make a given map and all should Read More...
Posted Monday, July 16, 2007 12:53 PM by MappingCenterTeam | 0 Comments
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Displaying a Perimeter for All Polygons in a Dataset

We were asked, not long ago: "I’ve got a dataset with polygons that represent the extent of field study areas at different dates; these study areas have grown over time and I want to show a single polygon that represents each site’s current study area, Read More...
Posted Friday, July 13, 2007 12:50 PM by MappingCenterTeam | 0 Comments
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ESRI_Optimized.style available in ArcGIS 9.2

Quite a few people saw technical sessions in San Diego at the Users Conference where the ESRI_Optimized.style was mentioned. A number of you have written in, asking, "What exactly is it?" and "Where can I find it?" The ESRI_Optimized style contains a Read More...
Posted Monday, July 09, 2007 12:48 PM by MappingCenterTeam | 0 Comments
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Choosing an appropriate cell size when interpolating raster data

“If I want to create a digital elevation model (DEM) by interpolating from a point shapefile (digital terrain model or DTM), how can I select the most correct cell size given the original separation of the point file?” We recently received this question Read More...
Posted Tuesday, July 03, 2007 12:36 PM by MappingCenterTeam | 0 Comments