Posts Tagged ‘charlie’

A tutorial for creating good layer packages (ESRI)

Wednesday, February 24th, 2010

[Editor's note: The 9.3.1 release of ArcGIS adds the ability to embed GIS data in layer packages for easy sharing. This blog post from ESRI steps thru how to create and leverage layer packages. Natural Earth will soon be available as a layer package!]

Republished from ESRI ArcExplorer blog.

With the release of ArcGIS Desktop 9.3.1 the ability to create layer packages was introduced. Layer packages encapsulate the data, cartography, and other properties of the layer as it’s authored in ArcMap (or ArcGlobe) into one easily shareable package.

Layer packages can be shared with other ArcGIS Desktop users, shared on ArcGIS Online (public beta soon), and are also supported in ArcGIS Explorer 900 along with layer files. What’s significant for Explorer users is that now the cartographic capabilities of ArcGIS Desktop can be seen using Explorer. In the past only simple rendering options were available in Explorer for local data sources, now these are expanded to include ArcGIS Desktop cartography via layer files and layer packages.

ArcGIS 9.3.1 was released not long ago, and ArcGIS Explorer 900 is currently in Beta. But since you may want to begin to create layer packages now for use in Explorer 900 when it becomes available we thought we’d cover a few basic pointers on how to create good layer packages.

We began by downloading some data and an ArcMap document (.mxd file) from the USGS. The data we downloaded was from an open file report with data from the Engineering aspects of karst map.

We downloaded the data, started ArcMap, opened the provided map document, and this is where we started. Our goal for this post was to take the karst_polys_polygon layer in the map and share it as a layer package with ArcGIS Explorer 900 users.

You can see the data (from a personal geodatabase) is already symbolized so we have a good start. But there’s a few things we want to do during the process of authoring the layer package that will ensure those we share the layer package with have the best possible experience and that we present the data in the best possible way. We think authoring is a good way to think about this process, and we’ll step you through the basics of what to consider.

Continue reading at ESRI ArcGIS Explorer Blog . . .

How Can You Tell What Map Scales Are Shown For Online Maps? (ESRI)

Wednesday, May 27th, 2009


[Editor's note: I'm working on a group base map project that will be released in October that is for mapping at the 1:10,000,000 (1:10m) scale and smaller (regional continental to global at small print dimensions). I want this data to be easily used with online mapping services, but converting Google map tile set "levels" to natural scale equivelants isn't obvious. I remembered seeing this table at last year's NACIS conference in Missoula, Montana. Charlie Frye was kind enough to remind me where to find it on the ESRI site.]

Republished from ESRI Mapping Center.

As you zoom in (or out) of the online maps you see on Virtual Earth (VE) or Google Maps (GM), you are actually seeing a series of different maps with slightly different information displayed at each zoom level. Zoom level is indicated and controlled in an online map by the vertical zoom slider, like the one shown at the left in the image here. Whenever the zoom level is changed, a different map is shown.

Of course, these maps are well designed so that viewers are largely unaware that they are seeing these different maps. The foundation for good design of an “online map” hinges on understanding how to design for each of the zoom level represented in the entire online map. Colors, fonts, number of and types of features, etc. are all seriously considered when each of the maps is created for each of the zoom levels.

When authoring this kind of online map with ArcGIS, a map document containing group layers, one for each zoom level, is a good approach. (The Working with layers and scale ranges blog entry provides a good overview of how to organize a map document this way.) Each zoom level in the online map is represented by your work at a specific map scale in the ArcMap document. The hard part is to figure out which zoom level matches to which map scale. There are twenty zoom levels for Virtual Earth or Google Maps. The corresponding map scales that you would design and create your maps at if you wanted them to mash up on VE or GM are:

Continue reading at ESRI Mapping Center . . .