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I have a geoJSON file from Alameda County, California, that says it is based on "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" }}. For a given parcel, I am getting "CENTROID_X": 6049318.7740417197, "CENTROID_Y": 2116583.343045 which I am guessing is in feet but I would like to be able to convert to lat/long to be able to plot markers in Google Maps.

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  • @Pointdump I am writing code in node; see answer below that references a helpful library called proj4
    – Zachary Russell Heineman
    Commented May 10, 2023 at 15:55
  • @IanTurton thanks for the references; I'm learning a lot!
    – Zachary Russell Heineman
    Commented May 10, 2023 at 15:56
  • @user2856 thanks for the suggestion; I guess the metadata urn:ogc:def:crs:OGC:1.3:CRS84 references the shape coordinates but for some reason the centroids are different
    – Zachary Russell Heineman
    Commented May 10, 2023 at 15:58
  • Nope, who ever put the meta data in lied to you by the look of it. GeoJSON is normally in lon/lat (CRS84) but your numbers are too big
    – Ian Turton ♦
    Commented May 10, 2023 at 16:00

2 Answers 2

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Credit to user2856 as well (for suggesting State Plane California zone 3):

Using node for conversion:

const proj4 = require('proj4')

const statePlaneCaliforniaZone3 = '+proj=lcc +lat_1=38.43333333333333 +lat_2=37.06666666666667 +lat_0=36.5 +lon_0=-120.5 +x_0=2000000.0001016 +y_0=500000.0001016001 +datum=NAD83 +units=us-ft +no_defs'

console.log(proj4(statePlaneCaliforniaZone3).inverse([6067236.27979723, 2123145.85667419]))
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Credit to user2856

State Plane California zone 3

Confirmed in FME Desktop (Form) and reprojected to Latitude/Longitude.

enter image description here

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