How to Record Orthometric Height in Esri Collector (v18.1.0) with Your Eos Arrow GNSS Receiver
There is big news in mobile data collection for GIS field operations. It is now possible to record orthometric heights directly in the fieldwithout the need for post-processing. This is thanks in part to the Eos Arrow receivers, which now support Geoid models, and in part to the new Collector v18.1.0 featuring the Z-value (aka “elevation”) in the geometry. Collector v18.1.0 was formerly known as “Collector Aurora” during its beta phase, but now will be called simply “Collector” among ArcGIS professionals. The previous version of Collector is informally known as “Collector Classic”.
To take advantage of this, and record features with orthometric heights in the field, you will need to use ArcGIS for Desktop or ArcGIS Pro to create a feature class that is Z-enabled. If you have a previous map that you used with Collector Classic, you’ll need to modify these maps to support the elevation. You will then need to configure Eos Tools Pro (on iOS or Android) for your Arrow receiver to send orthometric heights in real time to Collector.
In this video, you’ll learn how to collect real-time orthometric height with Esri Collector Aurora and the Eos Arrow GNSS receiver. To follow along you’ll need an Arrow receiver and the latest versions of Collector (v18.1.0) and Eos Tools Pro.
Transcript for “How to Record Orthometric Height in Esri Collector Aurora with Your Eos Arrow GNSS Receiver”
Eos Positioning Systems here. We’re excited to present you with an update to the Esri Collector for ArcGIS app. The old version that we’re accustomed to, is now known as Classic, with the old icon. The new version is called (just) Collector (formerly known as Aurora prior to its full release), and the icon is a little bit different.
This version comes with some exciting features which we’re about to review with the Eos Arrow Gold receiver. Some of these are: the new version of collector can collect elevation as part of a 3D geometry instead of as an attribute like in Collector Classic. Another exciting component is that with the Eos Tools Pro app, we can actually download the Geoid 12b model for orthometric heights in the NAVD 88 vertical datum. Therefore we can capture live ortho heights in the field instead of capturing basic ellipsoidal heights and having to do post-processing to convert it to orthometric heights back in the office.
So, first what I’d like to do is show you what’s inside Eos Tools Pro.
Here we’re running an Arrow Gold with RTK right now. At the bottom, if you click on the config tab, you’ll notice that there’s a new altitude tab. The standard is actually ellipsoidal, and you can see that from this tab we can download the geoid that we want. For the United States, we want geoid 12B.
After the download of the geoid model is complete, we want to tap on that line to get our little blue checkmark to show up and then tap “done”. Now change your “altitude reference” to orthometric, then tap done and go back to status.
After this change, if you observe closely below longitude, your ellipsoidal height has changed to “ortho height,” and this captures both orthometric and ellipsoidal heights.
Let’s review Collector Aurora. I’ve already gone through the app and connected it directly to my Arrow Gold. I’ve already created my RTK correction profile as we had in the past. The interface here is a little bit different. So real quick, let’s review it.
The live accuracy box has been moved from the lower left to the top. If we tap on that, we’ll see the same information from the previous version. It shows I’m connected to my Arrow GNSS receiver and states my estimated accuracy. It also shows I’m RTK fixed, and that I have a correction age of two seconds. The number of satellites I’m using is also displayed: 20 of the 34 satellites. I’ve applied my correction profile so that my imagery in the map lines up with the RTK corrections coming into my Arrow Gold. So I’m going to close, or X out of, that menu.
The little cursor for navigation can be tapped on to make sure you’re locked in.
Our collection button has been moved down to the bottom right. It’s a much cleaner User Interface (UI) compared to Collector Classic. I like this UI quite a bit. If I hit the plus button, it’s going to capture either a point, line or polygon. I’ll be capturing a point today.
The point that we just collected is similar to what you would see in Collector Classic, but in this app, we’re set up on the backend which has a different setup process — since we’re capturing 3D geometry instead of 2D.
After capturing the point you’ll see your name, receiver, estimated horizontal/vertical accuracy, latitude, and longitude. It also displays altitude is ellipsoidal height, and then orthometric height with the Geoid 12B applied. The rest are other standard information that we are accustomed to. This is a quick rundown of the exciting advancements/new features of the new version of collector.
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