spot-check sizes (px count) to scaling and numbers

[jordansread]

Verify that the colored pixel count within a state scales appropriately and that states are comparable.

[jordansread]

1995: ---
CA: 35294 mgd
    42088 pixels of color #2e86ab
    [0.8386 mgd per pixel]
TX: 24629 mgd
    29231 pixels of color #2e86ab
    [0.8426 mgd per pixel]
IL: 19547 mgd
    23301 pixels of color #2e86ab
    [0.8389 mgd per pixel]
NJ: 2137 mgd
    2448 pixels of color #2e86ab
    [0.8729 mgd per pixel]

1980: ---
CA: 43555 mgd
    52009 pixels of color #2e86ab
    [0.8375 mgd per pixel]
TX: 13958 mgd
    16511 pixels of color #2e86ab
    [0.8454 mgd per pixel]
IL: 17704 mgd
    2108 pixels of color #2e86ab
    [0.8396 mgd per pixel]
NJ: 2790 mgd
    3222 pixels of color #2e86ab
    [0.8659 mgd per pixel]

using

convert ../count_px/1980/NJ.png -format %c histogram:info:-

which outputs:

      3222: ( 46,134,171,255) #2E86ABFF srgba(46,134,171,1)
        43: ( 70,147,180,255) #4693B4FF srgba(70,147,180,1)
         1: ( 72,149,181,255) #4895B5FF srgba(72,149,181,1)
         2: ( 88,154,182,255) #589AB6FF srgba(88,154,182,1)
        28: ( 95,161,188,255) #5FA1BCFF srgba(95,161,188,1)
         1: ( 98,164,192,255) #62A4C0FF srgba(98,164,192,1)
         1: (107,162,185,255) #6BA2B9FF srgba(107,162,185,1)
        47: (119,174,197,255) #77AEC5FF srgba(119,174,197,1)
         1: (124,179,202,255) #7CB3CAFF srgba(124,179,202,1)
         2: (135,179,198,255) #87B3C6FF srgba(135,179,198,1)
         1: (140,184,203,255) #8CB8CBFF srgba(140,184,203,1)
        38: (143,187,206,255) #8FBBCEFF srgba(143,187,206,1)
         1: (149,182,196,255) #95B6C4FF srgba(149,182,196,1)
         1: (150,194,213,255) #96C2D5FF srgba(150,194,213,1)
         1: (153,186,200,255) #99BAC8FF srgba(153,186,200,1)
         1: (164,197,211,255) #A4C5D3FF srgba(164,197,211,1)
         1: (166,199,213,255) #A6C7D5FF srgba(166,199,213,1)
        37: (168,201,215,255) #A8C9D7FF srgba(168,201,215,1)
         1: (169,191,201,255) #A9BFC9FF srgba(169,191,201,1)
         1: (176,198,207,255) #B0C6CFFF srgba(176,198,207,1)
         1: (177,210,223,255) #B1D2DFFF srgba(177,210,223,1)
         1: (180,202,211,255) #B4CAD3FF srgba(180,202,211,1)
        45: (192,214,223,255) #C0D6DFFF srgba(192,214,223,1)
         1: (192,214,224,255) #C0D6E0FF srgba(192,214,224,1)
         1: (197,208,212,255) #C5D0D4FF srgba(197,208,212,1)
         1: (203,225,234,255) #CBE1EAFF srgba(203,225,234,1)
         1: (205,216,220,255) #CDD8DCFF srgba(205,216,220,1)
         1: (208,208,208,255) #D0D0D0FF srgba(208,208,208,1)
         1: (208,219,223,255) #D0DBDFFF srgba(208,219,223,1)
         1: (209,220,224,255) #D1DCE0FF srgba(209,220,224,1)
         2: (210,210,210,255) #D2D2D2FF srgba(210,210,210,1)
        16: (211,211,211,255) #D3D3D3FF LightGray
         9: (212,212,212,255) #D4D4D4FF grey83
         5: (213,213,213,255) #D5D5D5FF srgba(213,213,213,1)
         2: (213,224,228,255) #D5E0E4FF srgba(213,224,228,1)
        12: (214,214,214,255) #D6D6D6FF grey84
        30: (215,215,215,255) #D7D7D7FF srgba(215,215,215,1)
         3: (216,216,216,255) #D8D8D8FF srgba(216,216,216,1)
        25: (217,217,217,255) #D9D9D9FF grey85
        45: (217,228,232,255) #D9E4E8FF srgba(217,228,232,1)
        32: (218,218,218,255) #DADADAFF srgba(218,218,218,1)
         3: (219,219,219,255) #DBDBDBFF grey86
         4: (220,220,220,255) #DCDCDCFF gainsboro
         9: (221,221,221,255) #DDDDDDFF srgba(221,221,221,1)
        22: (222,222,222,255) #DEDEDEFF grey87
        18: (223,223,223,255) #DFDFDFFF srgba(223,223,223,1)
         8: (224,224,224,255) #E0E0E0FF grey88
        24: (225,225,225,255) #E1E1E1FF srgba(225,225,225,1)
        14: (226,226,226,255) #E2E2E2FF srgba(226,226,226,1)
         4: (227,227,227,255) #E3E3E3FF grey89
         4: (228,228,228,255) #E4E4E4FF srgba(228,228,228,1)
        55: (229,229,229,255) #E5E5E5FF grey90
         1: (231,231,231,255) #E7E7E7FF srgba(231,231,231,1)
         1: (232,232,232,255) #E8E8E8FF grey91
        32: (233,233,233,255) #E9E9E9FF srgba(233,233,233,1)
        31: (234,234,234,255) #EAEAEAFF srgba(234,234,234,1)
        26: (237,237,237,255) #EDEDEDFF grey93
         2: (239,239,239,255) #EFEFEFFF srgba(239,239,239,1)
        34: (240,240,240,255) #F0F0F0FF grey94
      4627: (241,241,241,255) #F1F1F1FF srgba(241,241,241,1)
         1: (243,243,243,255) #F3F3F3FF srgba(243,243,243,1)
         1: (244,244,244,255) #F4F4F4FF srgba(244,244,244,1)
        27: (245,245,245,255) #F5F5F5FF grey96
         2: (248,248,248,255) #F8F8F8FF srgba(248,248,248,1)
        54: (250,250,250,255) #FAFAFAFF grey98
      3542: (255,255,255,255) #FFFFFFFF white

[jordansread]

explanation of the above ☝️ I took png images of the viz with other states masked out and at the same zoom level. There are 4 colors in the map - white, grey (state background), darker grey (state background border), and the emphasis color (http://www.color-hex.com/color/2e86ab). I used imagemagick to do histograms of the images for each state to get a pixel count for each color. There are way more than 4 colors coming back in the histograms, which is because of the edges. So, it makes sense that the ratios of px to mgd will vary a bit among more complex features, and that the smaller the size of the emphasis space, the more "border" pixels you have which drops the px count for the emphasis color.

[jordansread]

completed