going through ArcGIS training http://www…

going through ArcGIS training http://www.urban-research.info/workshops/california-gis.htm






9 responses to “going through ArcGIS training http://www…”

  1. q: only tracts have year names, the other data doesn’t update by census year?
    q: is it possible to make layers transparent? -> properties -> display -> transparent

  2. will probably get addressed later: does data merge happen at the GIST_ID variable?
    -> the FIPSSTCO

  3. omg there’s this two humongous, nearly county sized islands south of la in the pacific ocean. scary! i had no idea! *giggles*

  4. tip: for lower ver compatibility, use 10 char or less, not spaces nor funny char. just alphabet and underscore

  5. q: if we keep the polygons without data, can those be displayed differently? (e.g. greyed out) because that seems to tbbe the convention on thematic maps

  6. method: quantile N/4, natural breaks (discovers patterns), baseline: use mean as bottom level, then do manual.

    q: can baseline be mixed with other methods? (quantile/natural)?

    q: could the data join process be kept without saving a new file?
    no (but it seems to refresh data every time the arcmap project file is opened)

  7. q: is there information about the the geographic area covered by tracts? (how many sq miles is each tract?)
    no. but arcgis can calculate the area of polygons

  8. q: is it possible to export the no-matches to do further analysis? (edit in excel, etc)
    -> yes

    q: street relevancy?
    -> the info is coded as “primary”, “residential”, which can be isolated

  9. since the computers in the practice room were already pretty fast (pentium 4 3ghz, 2gb ram), i won’t see a speed improvement on my work computer, which means street display at anything bigger than a single county will be VERY slow. so if i want to do multi-county geocoding for a location query against a congressional district, maybe i should pass that through batchgeocode.com first and then do the match, since batchgeocode is fast and can handle the whole country

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