Mapping Center

Most of us use digital elevation models (DEMs) which are raster data sets that represent a continuous elevation surface in which each cell represents the elevation at its location. DEM data are typically available in tiles that are sized to balance ease of data sharing with coverage so that those who need several tiles to cover their area of interest are not overburdened with extensive post-download data processing Read More...

We mentioned a few tips about legend design in our session called "The One Minute Cartographer" at the 2008 ESRI User Conference. (The PowerPoint presentation is available for download on the Other Resources page.) We decided to share those tips and some general guidance on legends here since some of you have been asking about legends lately on Ask a Cartographer. Read More...

We've received the title question several times in the past few months.  While a specific answer is already on Ask a Cartographer, I thought it would be good to address some of the circumstances that cause problems or require exceptions to our response: Read More...

New in ArcGIS 9.3: you can send error reports to ESRI any time ArcGIS crashes. Software crashes are a serious software quality issue. Our goal is to eliminate them. The folks on our development teams wanted to explain why crash reporting was added and why it can help build better software for you. Read More...

Yesterday I got an email from a long time colleague showing me an online map and asking, “When will it be possible to do this map with ArcGIS”? The map is the interactive map of Washington DC at http://dc.everyblock.com. In particular my friend was looking at the crime map wondering how the proportional symbols showing crimes became disaggregated as he zoomed in, eventually showing individual crime sites. Read More...