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.

I want to calculate the percent change for median household income in Los Angeles at the block group level from 2000 to 2010. Someone told me I have to reaggregate 2000 block data to 2010 block group geography, do a spatial join based on centroid, and that I have to download "crosswalk" or relationship data from the U.S. Census comparing 2000 to 2010. I downloaded the relationship .txt file with 2000 California Census tabulation data and the 2010 tabulation data. Right now I have the unjoined data files. I don't know what to do next. What do I join together?

1) Can someone give me step-by-step instructions on how to calculate the percent change at the block group level? :/

2) If calculating it at the block group level is too complicated, I may just change my level of analysis to census tract level. How do I calculate the percent change at the census tract level?

share|improve this question

1 Answer 1

If you want to use Census tracts the good people at Brown University have already done the hard work for you:

Brown University Longitudinal Tract Database

This resource contains tract-level variables from 1970-2000 interpolated to 2010 boundaries, facilitating longitudinal analysis.

share|improve this answer
    
This is great! How do I use the crosswalk data? –  KTA May 15 '12 at 19:32
1  
From what it sounds like you don't even need to use the crosswalk files. The researchers at the US2010 project have tabulated a whole host of variables for you from the various Censuses, including median household income (also stratified by race/ethnicity). Just go in and download the files and everything will be there for you; they can then be easily joined to your 2010 tract feature class ('trtid10' or 'tractid' corresponds to 'GEOID10' in the Census TIGER/Line files). –  qgeog May 16 '12 at 13:02
    
The crosswalk files are intended for users who have other historical tract-level variables, not available in the pre-made Brown files, that need to be interpolated to 2010 boundaries. They provide instructions to do this in either Access or Stata on their site. –  qgeog May 16 '12 at 13:05

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.