Tag Archives: json

Updated geoconverter: { geoJson } <> { arcJson }

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I put together a simple geo-converter a while back (and posted about it) that converts geojson to arcjson\esrijson. I needed it to get some polygons in an arcgis feature service. I have updated that converter to also convert from arcjson to geojson as well. I used it to pull arcjson from an ArcGIS Feature Service via a query against the REST API and convert the results to geojson.

The geoconverter tool
http://brightrain.github.io/geoconverter/

source

I pulled the arcjson formatted data from City of Fort Collins ArcGIS web services

A query against the Neighborhoods layer, like so:
http://gis.fcgov.com/FTCArcGIS/rest/services/FCMaps/MapServer/17/query?returnGeometry=true&geometryType=esriGeometryEnvelope&geometry={%22xmin%22%3a-122%2c%22ymin%22%3a40%2c%22xmax%22%3a-80%2c%22ymax%22%3a50%2c%22spatialReference%22%3a{%22wkid%22%3a4326}}&inSR=4326&spatialRel=esriSpatialRelIntersects&where=%28HOODDESC+IS+NOT+NULL%29&outSR=4326&outFields=*&f=json

Results into the geoconverter

geo-arc2

Created a MapBox map with it

fchoods

And here’s some geojson to try out, Major League Baseball Stadiums
mlb
raw data

Play ball!

arcgis fulcrum add in

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In researching the fulcrum API for potential use in a project I thought I’d push it a bit further and ended up building a tool to import fulcrum data into ArcGIS. This happens, sometimes for the good and sometimes for an exercise in clicking. This time for the good as I ultimately created a couple of useful things:

1. a c# wrapper that turns fulcrum apps and records into usable .net objects

2. an ArcGIS add-in that imports all records from a selected app into a new feature class

The wrapper turns fulcrum api json responses into c# dictionaries and lists via the JavaScriptSerializer class and creates instances of custom fulcrumrecord and fulcrumform objects. This went pretty smoothly because the fulcrum api is both documented and well thought out.

I then used this wrapper to build an ArcGIS (ArcMap) add-in that imports all records from a selected app into a new file geodatabase feature class and adds it as a layer to the current map document. This is implemented via a separate class that digs into the depths of the ArcObjects model to create the feature class and populate it. If you’re familiar with ArcObjects this should look pretty familiar, if you are not, you might want to shield your eyes.

The code is available on github and you can find it here:

https://github.com/brightrain/arcgis-fulcrum-add-in

You can also just grab the .esriAddIn file from here and install it:

https://www.dropbox.com/s/5u0d66nylho4sf7/fulcrum.esriAddIn?dl=0

(BSD license disclaimer applies, truly alpha at this point)

Use is pretty straight forward, first you need to get your fulcrum api key from your profile, http://web.fulcrumapp.com/users/api then sign in. Then you’ll want to either create a new file geodatabase or determine which one you’d like to use. Both of these go in the Settings (gears on fulcrum add-in toolbar)

Notes:

The import is a read-only snapshot of the current records in the selected app. This can obviously be extended any way you like but, as-is, the feature class created is static.

Initially I added a setting to define the folder where photos were to be located and  the (first) photo for each record was downloaded to that location. The feature class then contained the full file path to the photo. I quickly realized that this could take a very long time depending on how many recordsphotos there are. So I altered it to populate a field with the link to the photo on the fulcrum site. However, there is also a branch of the git source that contains the original functionality to define a location and download the photo to disk.

Currently only the first photo is linked todownloaded. This could be handled by creating a separate, related stand alone table to hold links to multiple photos linked via the record id.

Recursion needs to be implemented in a couple of places to fully support the fulcrum data model. Most notably in the Section element type; the application currently ignores sections. But there can be an infinite number of nested sections that contain child elements.

It’s worth a mention that, if you’re looking for a COTS solution, Arc2EarthSync (beta)  now includes fulcrum as a provider that acts to keep fulcrum data up to date. I understand there are also plans to make it bi-directional.

Automate Updating an ArcGIS Online Feature Service

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For many of my clients purchasing and managing ArcGIS Server has been out of the question based on limited IT and GIS resources. So for years I’ve been testing hosted services that would allow them to get maps out to their customers via the web. None of them allowed for timely data updates to ever changing data however. So naturally when ArcGIS Online rolled out I had to take it for a spin to see how it might work.

My goal is to publish a map service to ArcGIS Online once and be able to update it through a simple console application that could be launched at some interval (hourly, daily, weekly).

Here’s what I did:
Publish the feature service via ArcGIS Desktop 10.1
Once you have an ArcGIS Online account and ArcGIS Desktop 10.1 installed it’s easy peasy to publish a feature service.  (how to)

Create an ArcGIS JavaScript web application for testing
In order to mimic a real world scenario as best I could (for a geo dev anyway) I created a fairly simple web map that shows recreation sites on top of a topo base map. Clicking on the map then displays that general area in a floating box with an aerial base and info about a rec site as the title if one is within clicked range. Simple (yet I have spent far too much time just browsing it).  I’ll be honest, that was the fun part. The feature service is obviously also available directly in an ArcGIS Online map.

Develop the .Net console application to update the feature service data from a local source
My console app is using the ArcObjects .Net SDK to access a feature class within a file geodatabase to mimic my clients’ typical GIS infrastructure. This requires an ArcGIS license of any flavor to be available from the running server. This could just as easily be any format you like however since all we’re really doing is building JSON objects to pass directly to the ArcGIS Spatial Data Server REST API.

I used brute force in deleting all features and then adding them all back but I could imagine something a bit more elegant. I also noticed in Fiddler that ArcGIS Online uses the applyEdits method for any edit operation (delete, add, update). applyEdits also allows you to cancel the entire request if anything fails. But I’m going for simplicity here.

Here’s the C# code that works to make these updates:


You can also find the source project on github

There’s lots of room for improvement here such as serializing the json and handling the updates more elegantly but this is a working example of how you might keep a hosted map service on ArcGIS Online updated.

I’m guessing there are use cases I hadn’t thought of and would love to hear them.