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Archive for March, 2008 Page 2 of 3



Embed Synchronized Google/Microsoft Virtual Earth Maps On Your Website/Blog

Now this is pretty slick! Go to this link at the MapChannels website, choose a location with the Google Maps interface, fill out a simple form, select some basic options, and get embeddable code that lets you display the same location in both Google Maps and Microsoft Virtual Earth Maps, side by side. Scroll/zoom one side, and the other follows automatically; you can also change the view (Map/Satellite/Terrain for Google, Road/Aerial/Hybrid/Bird’s Eye for Microsoft) independently for each side. Try it out here:

Map Channels - Free mapping tools for your website or blog



The Big List Of Free GIS Programs - N Through R

Part three of this series (part one, part two).

Natural Resources Database (NRDB)

Type: Freeware, open-source

Platform: Windows

Last update: 2007

Personal experience: Minimal

Description

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The Big List Of Free GIS Programs - I Through M

A continuation of this list from the first post.

Integrated Land and Water Information System (ILWIS)

Type: Freeware (formerly commercial), open-source

Platform: Windows

Last update: 2006?

Personal experience: Minimal

I plan to look at this one in greater detail in the future - looks like it has some really useful capabilities. Here’s a list of chapter titles from the Applications Guide to give you a feeling for what it can do:

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The Big List Of Free Basic GIS Programs - A Through H

The backlog of topics for this blog continues to grow beyond my ability to keep up with it, and current work demands make it unlikely I’ll be able to catch up soon (though I should still be able to put up new posts at about the same rate). So I thought I’d do a quick set of posts on various types of GIS software, including both those that I have looked at in some detail, as well as those that I’ve given either a cursory look, or none at all. Let me know which ones I’ve missed, and I’ll add them to the list (and put up a separate post on them if warranted). I welcome comments on any of these programs, especially those I haven’t really posted on yet; if the comment is long enough, I’ll put it up as a full guest post. And I’m likely to come back to some of these in greater detail in the future.

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High-Res Garmin Topo Maps Now Out For Utah

I posted earlier about a set of high-res topo maps (roughly equivalent to 1:24K USGS topos) for Wyoming and Colorado; the comparable maps for Utah have just been released:

- Interstates, highways, railroads, county, local and forest roads
- High resolution water data (lakes, rivers and streams)
- Land use, metro areas
- Elevation contours (40ft intervals)
- Points of interest (summits, mines, falls, dams, cemeteries, towers, populated places, etc.

Via GPS Tracklog and the encyclopedic GPSInformation.Net site.



List Of Map Products From the USGS

Stopped by the USGS Seamless Server recently for the first time in a while, and noticed they’ve added a drop-down list titled “Available Interactive Maps”. Listed there are a fairly wide-ranging set of data resources they’re working on; some are mostly duplicates of the Seamless Server data but with a slightly-different focus, while others contain unique data.

ARMI: A data viewer and retriever for the USGS’s Amphibian Research and Monitoring Initiative, a program designed to study and hopefully slow down the recent drastic reductions in amphibian numbers. Data includes factors like pesticides, hydrography, climate/weather and more.

USGS Projects In Afghanistan: Includes both an interactive data viewer and a list of downloadable data, including:

  • Landsat data, including 6-band corrected imagery by 1:250K quads
  • Aster Level 1A and 1B data
  • SRTM 90-meter DEMs, with void filling
  • German, Russian and USGS geology maps
  • Full sets of Russian topographic maps, 1:50K and 1:200K

U.S.-Mexico Border Environmental Health Initiative: Interactive data viewer for “satellite imagery, orthoimagery and integrated geology, hydrology, transportation, geographical names, potential sources of contaminants, demographic data for population density, Nexrad daily weather, and boundary datasets”.

CEOS WG on Information Systems and Services: A viewer showing coverage areas for various forms of earth observation (satellite and aerial observations). Coverage areas only, no data.

Hazards Data Distribution System: Data distribution related to recent natural disasters, including Hurricanes Katrina and Rita, and the Asian tsunami.

Drought Monitoring: Drought and vegetation index data for the United States.

Elevation Derivatives For National Applications (EDNA): Hydrological-oriented database (30-meter US resolution) with raster and vector data:

  • Aspect
  • Contours
  • Filled DEM
  • Flow Accumulation
  • Flow Direction
  • Reach Catchment Seedpoints
  • Reach Catchments
  • Shaded Relief
  • Sinks
  • Slope
  • Synthetic Streamlines

Integrated Vegetation Mapping Viewer: NDVI (normalized differential vegetation index), Fire Potential, Percent of Average Seasonal Greenness, and more.

Hurricane Katrina Disaster Response: Data that’s available from other sources, but brought together with a focus on the Gulf area.

Kentucky: Very similar to the USGS Seamless Server, but focused in on Kentucky. Not sure why ….

MRLC: Focused on the National Land Cover Database (2001 and 1992).

MOPEX: Focused on stream, watershed and hydrological data for the US.

Tampa Bay Viewer: As with Kentucky above, very similar to the USGS Seamless Server, but focused on the Tampa Bay Area.

Topobathy: A few small sections of bathymetric shaded relief (e.g. off the coast of San Francisco, the Seattle bay area), but otherwise not much different than the USGS Seamless Server.



Topographic Map Symbols for Historic Topographic Maps

Via The Map Room, a key to (mostly) obsolete symbols found on US topographic maps dating from the 1890s to 1920s. Creative Commons license, so they’re freely usable as long as you link back to the page.



Using Google Earth Ground Overlays To Display Shapefile Data

The best way to display shapefile data in Google Earth is to convert it directly into vector KML format, and I’ve covered several ways to do that for free or cheaply, including stand-alone programs and online converters. Of all these options, I prefer using either shp2kml or Shape2Earth because of the flexibility they offer in setting display attributes like color and shape. But there’s another option: convert shapefile data into a raster image, and then display it in Google Earth as a ground overlay. This has a few advantages over vector KML format:

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