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GIS

HIPAA

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The Grass is Greener with Turf.js

luminfire.com/gis

Andrew Walz

GIS Systems Engineer

@andywalz

github.com/andywalz/maptime-turf

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Why Turf? Because it’s JavaScript

“Any application that can be written in JavaScript, will eventually be written in JavaScript”

--Jeff Atwood, co-founder of Stack Exchange

“Love it or hate it, the one thing a modern developer cannot do is ignore JavaScript. It is slowly but surely eating your world.”

--Sandeep Bhanot, Salesforce.com/Trailhead Vice President

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JavaScript: Today

Millions of Developers
The largest repository of free libraries
Aka ECMAScript after org that standardizes it
Smart phones, Raspberry Pi, browsers, servers, the cloud (native apps too)
Controlled by non-profit foundations (with massive corporate support)
The de facto language of the Internet

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JavaScript: Today

Runs on all browsers

Runs at any scale

Runs without a browser

Runs as/on servers too!

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GIS & JavaScript

GEOJSON

APIs:

Google Maps
ArcGIS for JS
Carto
Mapbox
Bing
Mapquest
Here
OpenStreetMaps
& more

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GEOJSON

Human readable geospatial data format 👍👍
De facto standard for geo data on the web
Easy to download, create, or export from Desktop GIS
Portable across other languages like Python, PHP, etc
Turf is built from the ground up around GeoJson

Essential Resources:

geojson.org/geojson-spec.html
JSON Formatter Browser Extension (https://goo.gl/ZsE36k)
geojson.io
geojsonlint.com
mapshaper.org
pro.arcgis.com/en/pro-app/tool-reference/conversion/features-to-json.htm
QGIS - Layer > Save As

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Advanced geospatial analysis for browsers and node

→

turf.tin(points);

Simple Modular, simple-to-understand JavaScript functions that speak GeoJSON	Fast Takes advantage of the newest algorithms and doesn't require you to send data to a server	Modular Turf is a collection of small modules. You can require just what you use with browserify

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Turf Functions List

AGGREGATION collect MEASUREMENT along area bboxPolygon bearing center centroid destination distance envelope lineDistance midpoint pointOnSurface Square CLASSIFICATION nearest	TRANSFORMATION bezier buffer concave convex difference intersect simplify union MISC combine explode flip kinks lineSlice pointOnLine DATA random sample	HELPER featureCollection feature lineString multiLineString point polygon multiPoint multiPolygon geometryCollection INTERPOLATION isolines planepoint tin GRIDS hexGrid pointGrid squareGrid triangleGrid within	JOINS inside Tag META propEach coordEach coordReduce featureEach getCoord ASSERTIONS featureOf collectionOf bbox circle geojsonType propReduce coordAll tesselate

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Map Demos

http://conference-map.dev/

file:///Users/andywalz/Repos/FM/fmspatial/ancillary/index.html

https://www.mapbox.com/bites/00087/

http://geospatialem.github.io/conference-map/

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Let’s write some code!

github.com/andywalz/maptime-turf

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Node + Turf Demo

Terminal commands:

mkdir turf-demo
cd turf-demo/
git init
hub create
npm init
npm install open --save
npm install @turf/turf --save
ls node_modules
cat package.json
touch index.js
sublime .
node index.js

// Load GeoJson data: statewide libraries and hennepin county polygon

const points = JSON.parse(fs.readFileSync('./data/mn_libraries.geojson'));

const aoi = JSON.parse(fs.readFileSync('./data/hennepin.geojson'));

// Extract only points within aoi

var results = turf.within(points, aoi);

// Write results to a new geojson file

fs.writeFile('./hennepin_libraries.geojson',JSON.stringify(results));

console.log('saved output to hennepin_libraries.geojson, now opening map...');

// Map the Hennipen Co libaries in geojson.io

mapit(results);

// Buffer the libraries to see how much of county is within 2 miles of a libary

polygons = turf.buffer(results,2,'miles');

mapit(polygons);

function mapit(geojson) {

// open package allows open a file or url in the user's preferred application

const open = require('open');

// pass data to geojson.io via url segment

var geojsonUrl = 'http://geojson.io/#data=data:application/json,' + encodeURIComponent(JSON.stringify(geojson));

// open map in default web browser

open(geojsonUrl);

}

https://github.com/andywalz/turf-gislis

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LuminFire GIS Plugins and Code

WordPress Plugins

WP-GeoMeta — Provides low-level spatial support for WordPress and a dashboard to check on your spatial data.
WP Spatial Capabilities Check — Check which spatial functions your WordPress site’s MySQL database supports.
Brilliant Geocoder for Gravity Forms — Geocode user’s input values in the popular Gravity Forms plugin for WordPress.

Libraries

WP-GeoMeta-Lib — A library to add spatial support to your own WordPress plugins or themes.

FileMaker Demo File

fmFiddle — A sample FileMaker file with Geocoding and other spatial functionality. Requires FileMaker (afree 30 day trial of FileMaker is available).

https://brilliantplugins.com/