Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

Ok so as far as my understanding goes the most high resolution dataset available that factors in many other things (other than Census data ) at a 1X1 km resolution is Landscan data created by Oak ridge National Laboratory (ORNL). But, these are not available freely. What is the closest alternative you know of?

I am planning to use US Census Tiger data for 2010 and the lowest resolution it provides is of Census Tracts which are variable in their size (see here).

Can anyone suggest me any other alternative (transformed) datasets ?

share|improve this question
    
I am not seeing where to download population density shape files for census tract or census block. Can someone send me the link to a good source for this? Specifically I am interested in Washington DC, Virginia, and Maryland. –  user40586 Nov 14 at 1:55

3 Answers 3

up vote 8 down vote accepted

You can download Census Blocks from TIGER; you'll just have to download the data on a state-by-state basis and merge it all together.

EDIT: See this page for block-level shapefiles that already have the population and housing unit counts attached, so you don't have to deal with joining SF1 tables!

share|improve this answer
    
I have to still decide between the two, do you think it is possible to download all Census blocks for USA in one go? –  GeoH2O Mar 7 '12 at 13:09
2  
The reason they're not available in a single file is the sheer size it would be. Some states one their own have nearly 500 MB of data at the block level -- and that's just the compressed shapefile! That said, it doesn't take terribly long to go to the FTP site (linked from the page I referenced in my edit) and right-click -> Save As for the 50 states. In my experience, unzipping the large states is the part that takes the longest. –  nmpeterson Mar 7 '12 at 14:56
    
There are approximately 8.5 million Census Blocks :-). –  whuber Mar 7 '12 at 15:34
    
Yes there is a lot of data other than population i see.. –  GeoH2O Mar 7 '12 at 17:54
    
+1 for merged files... having to put those two files back together can be such an (unnecessary) pain! –  Jeff Bridgman May 14 '12 at 21:57

If you need a gridded data set CIESIN's Gridded Population datasets may be of use. See http://sedac.ciesin.columbia.edu/gpw/aboutus.jsp#aboutTable for more details. The best resolution is 30 Arc seconds.

share|improve this answer
    
This is a very good dataset but the only problem is that 30 arc second is available for the year 2000, i think it will be a while before 2010 data at that resolution will be available –  GeoH2O Mar 7 '12 at 18:35

Census.gov ->geography-> tiger data-> choose 2010 then use Web interface to download what you need, that is for shape files, for demographics you need to use the fact finder also on census website

share|improve this answer
    
Welcome to GIS@SE, it is a best practice to include an actual Link to the websites you provide for in your answers. –  Mark C Nov 14 at 4:26

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.