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nvkelso / election-geodata

Precinct shapes (and vote results) for US elections past, present, and future
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Add 2016 election precinct shapes for Idaho #10

Open nvkelso opened 7 years ago

nvkelso commented 7 years ago

This state is in priority tier 1 (out of all US states) according to https://lawreview.uchicago.edu/sites/lawreview.uchicago.edu/files/uploads/82_2/04%20Stephanopoulos_McGhee_ART.pdf (via http://mike.teczno.com/notes/redistricting/measuring-efficiency-gap.html).

nvkelso commented 7 years ago

When researching & requesting data also ask for matching election results (presidential, congressional, state house, and state senate) in addition to the precinct shape data for 2016, and for earlier election years if available.

nvkelso commented 7 years ago

Open Elections doesn't have anything here.

nvkelso commented 7 years ago
nvkelso commented 7 years ago 
Title: Voting Districts for the State of Idaho Redistricting 2001 Process
Originators: Idaho Legislative Services Office
Publisher: Idaho Legislative Services Office
Publication place: Boise, ID, USA
Publication date: 20010601
Edition: Redistricting Census 2000
Data type: vector digital data

Two counties have more recent data:

migurski commented 7 years ago

There’s something very off about the projection in the 2001 file above. It reports as tranverse mercator, but reprojecting to 4326 puts it near the equator.

Extent: (241777.209884, 98685.152902) - (744660.031381, 882019.644991)
Layer SRS WKT:
PROJCS["Custom",
    GEOGCS["GCS_North_American_1927",
        DATUM["North_American_Datum_1927",
            SPHEROID["Clarke_1866",6378206.4,294.9786982]],
        PRIMEM["Greenwich",0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",500000],
    PARAMETER["False_Northing",100000],
    PARAMETER["Central_Meridian",-114],
    PARAMETER["Scale_Factor",0.9996],
    PARAMETER["Central_Parallel",42],
    UNIT["Meter",1]]
nvkelso commented 7 years ago

Blast from the past: North_American_Datum_1927 and Clarke_1866!

On Thu, Mar 9, 2017 at 8:51 AM, Michal Migurski notifications@github.com wrote:

There’s something very off about the projection in the 2001 file above https://github.com/nvkelso/election-geodata/issues/10#issuecomment-284976517. It reports as tranverse mercator, but reprojecting to 4326 puts it near the equator.

Extent: (241777.209884, 98685.152902) - (744660.031381, 882019.644991) Layer SRS WKT: PROJCS["Custom", GEOGCS["GCS_North_American_1927", DATUM["North_American_Datum_1927", SPHEROID["Clarke_1866",6378206.4,294.9786982]], PRIMEM["Greenwich",0], UNIT["Degree",0.0174532925199433]], PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",500000], PARAMETER["False_Northing",100000], PARAMETER["Central_Meridian",-114], PARAMETER["Scale_Factor",0.9996], PARAMETER["Central_Parallel",42], UNIT["Meter",1]]

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/nvkelso/election-geodata/issues/10#issuecomment-285409670, or mute the thread https://github.com/notifications/unsubscribe-auth/AA0EO3s79kbEF66HrKoRm4w8IC6vZiNnks5rkC4ZgaJpZM4MTtn3 .

nvkelso commented 7 years ago

Yikes, I don't see a clear path forward here. I've looked at other datasets from the same source and they do register correctly, it's this one that is funky. Suggest we merge this now, and figure out the projection later (so not add it to the status map).

Here's what they report as standard projections for the state:

An aside: interesting map of who's responsible for geo data county-by-county in Idaho (lots of federal census):

nvkelso commented 7 years ago

Since we now have 2010 data for Idaho, I'd say skip those 2 counties.