I want to find a shapefile for the map at the bottom of
https://www.epa.gov/eco-research/ecoregions
I would want to create a map showing some data for the 10 forest ecoregions.
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1 Answer
Click on the Map
download the zip file
example: ftp://ftp.epa.gov/wed/ecoregions/reg8/
reg8_eco_l4.zip
unzip the file
reg_eco_l4.dbf (data/attribution file)
reg_eco_l4.shx (index file)
reg_eco_l4.shp (geometry)
reg_eco_l4.prj (projection file)
other files are not so important unless using ESRI products..
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I knew that I could get the shapefile for each region. I wanted to get a shapefile for the overall map, with information for all the regions. Apr 3, 2012 at 19:08
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1Merge and Dissolve can be applied - note: Please note: Web pages for Level IV Ecoregions are under construction. If you do not find a link to a state that has been completed, maps and GIS data are available on the Ecoregion FTP site and a web site will be available shortly.– Mapperz ♦Apr 3, 2012 at 20:09
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Can you please be more specific? How do I do merge in R? I have calculated the mean of each region. I want to map the means. Apr 3, 2012 at 20:19
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The Merge and Dissolve that @Mapperz was talking about would be performed in your GIS Software of choice, either QGIS or ArcGIS. You would download the shapefiles for the various regions, then merge the shapefiles into a single shapefile that contains polygons, and thus, data for each region. Since these have unique identifiers, the data can then be used in R for any statistical processing, ex. Means. This can be linked back to the shapefile and then symbolized in the GIS software. Apr 4, 2012 at 1:42