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Last active January 23, 2020 07:28
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Different centers: path.centroid to leaflet | turf.centroid | turf.centerOfMass | polylabel
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Annexations.json
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bundle.js
(function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
'use strict';
var Queue = require('tinyqueue');
module.exports = polylabel;
module.exports.default = polylabel;
function polylabel(polygon, precision, debug) {
precision = precision || 1.0;
// find the bounding box of the outer ring
var minX, minY, maxX, maxY;
for (var i = 0; i < polygon[0].length; i++) {
var p = polygon[0][i];
if (!i || p[0] < minX) minX = p[0];
if (!i || p[1] < minY) minY = p[1];
if (!i || p[0] > maxX) maxX = p[0];
if (!i || p[1] > maxY) maxY = p[1];
}
var width = maxX - minX;
var height = maxY - minY;
var cellSize = Math.min(width, height);
var h = cellSize / 2;
// a priority queue of cells in order of their "potential" (max distance to polygon)
var cellQueue = new Queue(null, compareMax);
if (cellSize === 0) return [minX, minY];
// cover polygon with initial cells
for (var x = minX; x < maxX; x += cellSize) {
for (var y = minY; y < maxY; y += cellSize) {
cellQueue.push(new Cell(x + h, y + h, h, polygon));
}
}
// take centroid as the first best guess
var bestCell = getCentroidCell(polygon);
// special case for rectangular polygons
var bboxCell = new Cell(minX + width / 2, minY + height / 2, 0, polygon);
if (bboxCell.d > bestCell.d) bestCell = bboxCell;
var numProbes = cellQueue.length;
while (cellQueue.length) {
// pick the most promising cell from the queue
var cell = cellQueue.pop();
// update the best cell if we found a better one
if (cell.d > bestCell.d) {
bestCell = cell;
if (debug) console.log('found best %d after %d probes', Math.round(1e4 * cell.d) / 1e4, numProbes);
}
// do not drill down further if there's no chance of a better solution
if (cell.max - bestCell.d <= precision) continue;
// split the cell into four cells
h = cell.h / 2;
cellQueue.push(new Cell(cell.x - h, cell.y - h, h, polygon));
cellQueue.push(new Cell(cell.x + h, cell.y - h, h, polygon));
cellQueue.push(new Cell(cell.x - h, cell.y + h, h, polygon));
cellQueue.push(new Cell(cell.x + h, cell.y + h, h, polygon));
numProbes += 4;
}
if (debug) {
console.log('num probes: ' + numProbes);
console.log('best distance: ' + bestCell.d);
}
return [bestCell.x, bestCell.y];
}
function compareMax(a, b) {
return b.max - a.max;
}
function Cell(x, y, h, polygon) {
this.x = x; // cell center x
this.y = y; // cell center y
this.h = h; // half the cell size
this.d = pointToPolygonDist(x, y, polygon); // distance from cell center to polygon
this.max = this.d + this.h * Math.SQRT2; // max distance to polygon within a cell
}
// signed distance from point to polygon outline (negative if point is outside)
function pointToPolygonDist(x, y, polygon) {
var inside = false;
var minDistSq = Infinity;
for (var k = 0; k < polygon.length; k++) {
var ring = polygon[k];
for (var i = 0, len = ring.length, j = len - 1; i < len; j = i++) {
var a = ring[i];
var b = ring[j];
if ((a[1] > y !== b[1] > y) &&
(x < (b[0] - a[0]) * (y - a[1]) / (b[1] - a[1]) + a[0])) inside = !inside;
minDistSq = Math.min(minDistSq, getSegDistSq(x, y, a, b));
}
}
return (inside ? 1 : -1) * Math.sqrt(minDistSq);
}
// get polygon centroid
function getCentroidCell(polygon) {
var area = 0;
var x = 0;
var y = 0;
var points = polygon[0];
for (var i = 0, len = points.length, j = len - 1; i < len; j = i++) {
var a = points[i];
var b = points[j];
var f = a[0] * b[1] - b[0] * a[1];
x += (a[0] + b[0]) * f;
y += (a[1] + b[1]) * f;
area += f * 3;
}
if (area === 0) return new Cell(points[0][0], points[0][1], 0, polygon);
return new Cell(x / area, y / area, 0, polygon);
}
// get squared distance from a point to a segment
function getSegDistSq(px, py, a, b) {
var x = a[0];
var y = a[1];
var dx = b[0] - x;
var dy = b[1] - y;
if (dx !== 0 || dy !== 0) {
var t = ((px - x) * dx + (py - y) * dy) / (dx * dx + dy * dy);
if (t > 1) {
x = b[0];
y = b[1];
} else if (t > 0) {
x += dx * t;
y += dy * t;
}
}
dx = px - x;
dy = py - y;
return dx * dx + dy * dy;
}
},{"tinyqueue":2}],2:[function(require,module,exports){
'use strict';
module.exports = TinyQueue;
module.exports.default = TinyQueue;
function TinyQueue(data, compare) {
if (!(this instanceof TinyQueue)) return new TinyQueue(data, compare);
this.data = data || [];
this.length = this.data.length;
this.compare = compare || defaultCompare;
if (this.length > 0) {
for (var i = (this.length >> 1) - 1; i >= 0; i--) this._down(i);
}
}
function defaultCompare(a, b) {
return a < b ? -1 : a > b ? 1 : 0;
}
TinyQueue.prototype = {
push: function (item) {
this.data.push(item);
this.length++;
this._up(this.length - 1);
},
pop: function () {
if (this.length === 0) return undefined;
var top = this.data[0];
this.length--;
if (this.length > 0) {
this.data[0] = this.data[this.length];
this._down(0);
}
this.data.pop();
return top;
},
peek: function () {
return this.data[0];
},
_up: function (pos) {
var data = this.data;
var compare = this.compare;
var item = data[pos];
while (pos > 0) {
var parent = (pos - 1) >> 1;
var current = data[parent];
if (compare(item, current) >= 0) break;
data[pos] = current;
pos = parent;
}
data[pos] = item;
},
_down: function (pos) {
var data = this.data;
var compare = this.compare;
var halfLength = this.length >> 1;
var item = data[pos];
while (pos < halfLength) {
var left = (pos << 1) + 1;
var right = left + 1;
var best = data[left];
if (right < this.length && compare(data[right], best) < 0) {
left = right;
best = data[right];
}
if (compare(best, item) >= 0) break;
data[pos] = best;
pos = left;
}
data[pos] = item;
}
};
},{}],3:[function(require,module,exports){
window.polylabel = require('polylabel');
// var p = polylabel(geojsonFeatureCol, 1.0);
// var weightedCentroid = require('turf-weighted-centroid');
//
//
},{"polylabel":1}]},{},[3]);
Raw
index.html
<!-- First, I found the centoid with d3.path and converted it from pixels to lat lng coordinates with leaflet (https://github.com/d3/d3-geo#path_centroid)
I also used:
turf.centroid: https://turfjs.org/docs/#centroid
turf.centerOfMass: https://turfjs.org/docs/#centerOfMass
polylabel (pole of inaccessibility): https://github.com/mapbox/polylabel
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<title></title>
<script src='https://npmcdn.com/@turf/turf/turf.min.js'></script>
<script src="https://d3js.org/queue.v1.min.js"></script>
<script src='bundle.js'></script>
<script src="https://cdn.jsdelivr.net/npm/geolib@3.0.4/lib/index.min.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/leaflet/1.0.3/leaflet.css" />
<style>
html, body {
padding: 0px;
margin: 0px;
}
html,body,#map {
width: 100%;
height: 100%;
}
.tick line {
stroke-dasharray: 2 2 ;
stroke: #ccc;
}
.dot {
height: .5em;
width: .5em;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
}
.info {
padding: 6px 8px;
font: 14px/16px Arial, Helvetica, sans-serif;
background: white;
background: rgba(255,255,255,0.8);
box-shadow: 0 0 15px rgba(0,0,0,0.2);
border-radius: 5px;
}
.legend {
line-height: 18px;
color: #555;
}
.legend i {
width: 18px;
height: 18px;
float: left;
margin-right: 8px;
opacity: 0.7;
}
</style>
</head>
<body>
<div id="map"></div>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"></script>
<script>
var map;
var url = 'https://gist.githubusercontent.com/Alex-Devoid/5f6665782677129909bfc76569cf118d/raw/ce4e5f6ab65b58ed9380f286ec9f6c83dd5dda45/Annexations.json';
var geo = 'tucsonAnexations.geojson';
queue()
.defer(d3.json, url)
.await(main);
function main(error, data) {
addLmaps();
drawFeatures(data);
}
function addLmaps() {
map = L.map('map').setView([32.216191, -110.924758], 11);
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
L.svg().addTo(map);
var legend = L.control({position: 'bottomleft'});
legend.onAdd = function (map) {
var div = L.DomUtil.create('div', 'info legend');
// loop through our density intervals and generate a label with a colored square for each interval
div.innerHTML =
'<i style="background:'+"red" + '"></i> ' + "d3 + leaflet" + '</p>'+
'<i style="background:'+"blue" + '"></i> ' + "Turf Centroid" + '</p>'+
'<i style="background:'+"green" + '"></i> ' + "Turf Center of Mass" + '</p>'+
'<i style="background:'+"purple" + '"></i> ' + "Polylable" ;
return div;
};
legend.addTo(map);
}
function projectPoint(x, y) {
var point = map.latLngToLayerPoint(new L.LatLng(y, x));
this.stream.point(point.x, point.y);
}
function drawFeatures(az, geo) {
var svg = d3.select("#map").select("svg");
var g = svg.append("g")
var transform = d3.geoTransform({point: projectPoint});
var path = d3.geoPath().projection(transform);
var selected = d3.set([
'TUC'
]);
var mergeTucson = topojson.merge(az, az.objects.Annexations.geometries.filter(function(d) {
return selected.has(d.properties.CITY_CD)
}));
var mergeCentroid = path.centroid(mergeTucson);
var latLngCentroid = map.layerPointToLatLng(mergeCentroid);
///////////
var turfCentroid = turf.centroid(mergeTucson);
////////////
var turfCenterOfMass = turf.centerOfMass(mergeTucson);
///////////
var pp = polylabel(mergeTucson.coordinates[0], 1.0);
console.log('d3 + leaflet');
console.log(latLngCentroid);
console.log('Turf');
console.log("turfCentroid_GEO: ");
console.log(turfCentroid);
console.log('centerOfMass: ');
console.log(turfCenterOfMass);
console.log('polylabel');
console.log(pp);
var latLngCentroid1 = {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": []
},
"properties": {
"name": "D3 to Leaflet Centroid"
}
}
var turfCentroid1 = {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": []
},
"properties": {
"name": "Turf Centroid"
}
}
var turfCenterOfMass1 = {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": []
},
"properties": {
"name": "Turf Center Of Mass"
}
}
var pp1 = {
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": []
},
"properties": {
"name": "Turf Weighted Centroid"
}
}
latLngCentroid1.geometry.coordinates.push(latLngCentroid.lat)
latLngCentroid1.geometry.coordinates.push(latLngCentroid.lng)
turfCentroid1.geometry.coordinates.push(turfCentroid.geometry.coordinates[1])
turfCentroid1.geometry.coordinates.push(turfCentroid.geometry.coordinates[0])
turfCenterOfMass1.geometry.coordinates.push(turfCenterOfMass.geometry.coordinates[1])
turfCenterOfMass1.geometry.coordinates.push(turfCenterOfMass.geometry.coordinates[0])
pp1.geometry.coordinates.push(pp[1])
pp1.geometry.coordinates.push(pp[0])
var d3LeafletCircle = L.circle(latLngCentroid1.geometry.coordinates, {
color: 'red',
fillColor: 'red',
fillOpacity: 0.5,
radius: 100
}).addTo(map);
d3LeafletCircle.bindPopup("d3 + leaflet").openPopup();
var turfCentroidCircle = L.circle(turfCentroid1.geometry.coordinates, {
color: 'blue',
fillColor: 'blue',
fillOpacity: 0.5,
radius: 100
}).addTo(map);
turfCentroidCircle.bindPopup("Turf Centroid").openPopup();
var turfCenterOfMassCircle = L.circle(turfCenterOfMass1.geometry.coordinates, {
color: 'green',
fillColor: 'green',
fillOpacity: 0.5,
radius: 100
}).addTo(map);
turfCenterOfMassCircle.bindPopup("Turf Center of Mass").openPopup();
var polylableCircle = L.circle(pp1.geometry.coordinates, {
color: 'purple',
fillColor: 'purple',
fillOpacity: 0.5,
radius: 100
}).addTo(map);
polylableCircle.bindPopup('Polylable "pole of inaccessibility"').openPopup();
var featureElement = svg.selectAll("path")
.data([mergeTucson]).enter().append("path")
.attr("class", "state selected")
.attr("fill", "grey")
.attr("fill-opacity", 0.6)
.attr("stroke", "#000ffd");
map.on("moveend", update);
update();
function update() {
featureElement.attr("d", path);
}
}
</script>
</body>
</html>
Display the source blob
Display the rendered blob
Raw
tucsonAnexations.geojson
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"OBJECTID": 31,
"ORD": "1663",
"BOOK": 11,
"PAGE": 92,
"EFF_DATE": "1956-06-25T00:00:00.000Z",
"CITY_CD": "TUC",
"CITY_DS": "TUCSON",
"SEQ_NUM": " ",
"DOC_Link": "http://dot.pima.gov/eim/dms/dmssearch.cfm?AppName=ANNEX&ORDINANCE=1663&CITY=TUC",
"DEANNEX": "N",
"PC_UID": 31,
"URL": "https://www.tucsonaz.gov/apps/maps-and-records/annexations/details/11-92& ",
"DATASOURCE": "ANNEX",
"ShapeSTArea": 1208244.2630004883,
"ShapeSTLength": 4685.007634529612
},
"geometry": {
"type": "Polygon",
"coordinates": [
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[
-110.99906517739826,
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],
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-110.99909976258026,
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],
[
-111.0014494915811,
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],
[
-111.00337808630655,
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],
[
-111.00337523062547,
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],
[
-110.99976884232166,
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],
[
-110.99956844831725,
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],
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-110.99950740376946,
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],
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-110.99902505463685,
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],
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-110.99901355817377,
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],
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-110.99901295298609,
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],
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-110.99864676658039,
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],
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-110.99864626862069,
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],
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-110.99891167399967,
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],
[
-110.99892392748022,
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],
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-110.99893808066096,
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],
[
-110.99895819754724,
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],
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-110.99898017461615,
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],
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-110.99900534984198,
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],
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-110.99903369440693,
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],
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-110.99906517739826,
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]
]
]
}
},
{
"type": "Feature",
"properties": {
"OBJECTID": 32,
"ORD": "3396",
"BOOK": 20,
"PAGE": 55,
"EFF_DATE": "1970-03-03T00:00:00.000Z",
"CITY_CD": "TUC",
"CITY_DS": "TUCSON",
"SEQ_NUM": " ",
"DOC_Link": "http://dot.pima.gov/eim/dms/dmssearch.cfm?AppName=ANNEX&ORDINANCE=3396&CITY=TUC",
"DEANNEX": "N",
"PC_UID": 32,
"URL": "https://www.tucsonaz.gov/apps/maps-and-records/annexations/details/20-55& ",
"DATASOURCE": "ANNEX",
"ShapeSTArea": 9460288.52456665,
"ShapeSTLength": 12546.959082713525
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-111.01186228538928,
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],
[
-111.01185523029564,
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],
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-111.0118556997432,
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],
[
-111.01189320033797,
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],
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-111.01199109717477,
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],
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],
[
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],
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],
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-111.02001655896258,
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],
[
-111.02001633588891,
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],
[
-111.01186228538928,
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]
]
]
}
},
{
"type": "Feature",
"properties": {
"OBJECTID": 33,
"ORD": "3375",
"BOOK": 20,
"PAGE": 41,
"EFF_DATE": "1970-01-02T00:00:00.000Z",
"CITY_CD": "TUC",
"CITY_DS": "TUCSON",
"SEQ_NUM": " ",
"DOC_Link": "http://dot.pima.gov/eim/dms/dmssearch.cfm?AppName=ANNEX&ORDINANCE=3375&CITY=TUC",
"DEANNEX": "N",
"PC_UID": 33,
"URL": "https://www.tucsonaz.gov/apps/maps-and-records/annexations/details/20-41& ",
"DATASOURCE": "ANNEX",
"ShapeSTArea": 26930542.7789917,
"ShapeSTLength": 23674.169119022765
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-111.01181603380181,
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],
[
-111.01185523029564,
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],
[
-111.01186228538928,
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],
[
-111.02001633588891,
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],
[
-111.02001411501257,
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],
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],
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-111.02890347142555,
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[
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],
[
-111.0288963680063,
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],
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-111.02857340512799,
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],
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],
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],
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],
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],
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],
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],
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]
]
]
}
},
{
"type": "Feature",
"properties": {
"OBJECTID": 35,
"ORD": "1973",
"BOOK": 14,
"PAGE": 26,
"EFF_DATE": "1959-11-02T00:00:00.000Z",
"CITY_CD": "TUC",
"CITY_DS": "TUCSON",
"SEQ_NUM": " ",
"DOC_Link": "http://dot.pima.gov/eim/dms/dmssearch.cfm?AppName=ANNEX&ORDINANCE=1973&CITY=TUC",
"DEANNEX": "N",
"PC_UID": 35,
"URL": "https://www.tucsonaz.gov/apps/maps-and-records/annexations/details/14-26& ",
"DATASOURCE": "ANNEX",
"ShapeSTArea": 347650.99923706055,
"ShapeSTLength": 2337.202780340636
},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-110.8649791926242,
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],
[
-110.8649718981128,
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],
[
-110.86496884265641,
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],
[
-110.8649573388436,
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],
[
-110.86554694876313,
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],
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