Using an iPhone or iPad app to change the shape of an area

“After I add an Area using the GPS pick function, I want to be able to add a few nodes to be able to make the shape exactly how I want it. Is this possible?”

Which app are you using?

iCMTGIS PRO and iCMTGIS III provide the Insert Node and Mode Node functions.

A number of our apps, such as the iCMTGIS II app, have the Move Node function.

You could add Point Features at the positions of the additional nodes then use the Add Area manually function and tap on all the nodes that form the exact polygon that you want. Then you can delete the original shape.

User’s reply:
“Thanks! It just says Stakeout iCMT 1.0.4 in the About info. I just added another area manually over the existing one, extending out where I wanted it, then deleted the original as you suggested. That worked fine.”

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I have the LAT-LON coordinates of the four corners of a piece of rectangle-shaped property. Will Partition & Stakeout let me place the four corners in the app and help me get to them on the property?

Yes, you can use the Add Point by Coordinates function to add the LAT-LON coordinates of each point into the app. Make sure you enter the North, South, East and West designations correctly. Otherwise the points will end up in unexpected places in the world.
After the points have been created, you can use Point Stakeout to help you approach each point. Or, you could use the Add Area Manually function to form an Area Feature that represents the property then use the Line Stakeout function to help you walk along the boundary of the property.

Do you have a simple users manual for figuring out acreage. I am a farmer and I am trying to measure the acreage of various small plots on my iPhone.

The iGPSGIS II app for iPad comes with a Help document under the Main Menu. We also have this document in PDF format that is available upon request.

You can use the GPS data collection function in the iGPSGIS II app to walk the boundary of each farm plot while recording GPS fixes then have its acreage displayed. The app will also let you record other information with each plot (such as the crop name, year planted, etc.). The Feature List (Feature attribute/value database) provides a convenient way to tag Features with pre-defined relevant information during GPS data collection, but it is not necessary to have a Feature List to do a data collection job. The accuracy of the area obtained this way will depend on the accuracy of the GPS receiver used.

Alternatively, if you are able to identify the plots on the displayed Apple Map, then you could zoom into the map, digitize the plots and have the acreages displayed. Please see this tutorial that describes how to digitize a Feature.

See also:

How to digitize an area?
Defining GPS data collection parameters
Setting up the Attributes for a Feature Topic
Expediting data collection
Starting a GPS/GIS data collection job
Collecting GPS/GIS data for a Point Feature Topic

Area – Distance updated for iOS 8 compatibility

Area – Distance Version 1.0.1 has been released.
This update fixes the iOS 8 compatibility issue.

How to create new point, line and polygon features with associated attribute fields and values?

There are a few ways of adding Points, Lines and Polygon Features to a map job.

1) Digitization

You will first need to create a new Topic layer on which to store the Features. Specify the correct topic type (Point, Line or Area) for the New Topic. Also, Farming GPS GIS, Forester GPS GIS and Utility Data Collection will let you add a Topic from the Feature List associated with the map job.

The Tools menu provides the Add Point manually, Add Line manually and Add Area manually functions. When a Point Topic is active, you can digitize Point Features. When a Line Topic is active, you can digitize Line Features. When an Area Topic is active, you can digitize Area Features.

Use the Edit Topic function to add Attribute fields to the Topic.

After digitizing the Features, you can turn on Sheet View (the right-most icon at the top) and enter the values. Farming GPS GIS, Forester GPS GIS and Utility Data Collection provide the ability to select pre-defined attribute values from within the Sheet View.

2) GPS Data Collection

The iCMTGIS II, iGPSGIS II and Utility Data Collection software apps will let you map points, lines and areas using GPS. When you collect GPS data, you can record the attribute values at the same time.

If you have a Feature List defined and associated with a job, during GPS data collection you can simply select one of the Values instead of having to enter the data by hand. The Feature List function is listed under GPS. It lets you define the Feature Topic Layers, the Attributes and the Values for the Attributes as well as the GPS data collection parameters.

Select Main Menu\Job\Current Job to get to the Job Setup screen. Here is where you can select the Feature List to be associated with the active Job. The iCMTGIS II, iGPSGIS II and Utility Data Collection software provide a Feature List file named “park.fbr” as an example.

The GPS data collection function is provided under GPS. Please see the built-in Help document for the procedure for recording various types of points, lines and areas. This document is available in PDF format upon request.

3) For Point Features, there are also the Traverse method under data collection and the Add Point by Coordinates function that you can use to create new points.

Partition & Stakeout app released

Direction Cut

Direction Cut

“Partition & Stakeout” is an app for iPad, iPhone and iPod touch that provides the functionality of the Partition – Distance – Area app plus the functionality of the Stakeout iCMT app. You can use it to precisely digitize a timber tract, a land parcel, a campus or any other real property and divide it into sub-areas. If your device has GPS capability, you may record the GPS location as a Point, or pick the GPS location as a node for the Line or Area you are creating. You may also let the Stakeout functions in this app help you approach a point or move along a line or area boundary in the field.

You can work with one or more jobs. The job data can be exported to DXF, and the coordinates and drawing can be output to PDF.

Detailed Function List:

* Precisely digitize Points, Lines and Areas over the built-in Map.
* Sub-divide an Area by Direction Cut, Hinge Cut or a digitized Split-Line.
* Use Point Stakeout and GPS to locate a point or a node on a line.
* Use Line Stakeout and GPS to locate a line.
* View position, length and area values for the Features.
* Label the Lines with segment lengths and directions as well as corner angles.
* Label the Areas with size in acres and square feet or hectares and square meters.
* Measure distances and areas without saving the shapes.
* Move existing nodes to fine-tune the map drawing.
* Create a Point from entered coordinates.
* Create a Point or record a node by picking the GPS location.
* Save the job data file for later use.
* Export Feature data to DXF.
* Output the drawing and the coordinates to PDF.
* Email the job data files and the PDF files to your colleagues.

Partition & Stakeout is now available at the Apple App Store.

Area – Distance app released

Move a node to adjust its position

In answer to many iOS user’s search for a handy and economical tool for measuring distances and areas, CMTINC.COM announces the release of the Area – Distance software application for use on the iPad, iPhone and iPod touch. This app distinguishes itself from other similar apps by providing an easy way to digitize points, lines and areas to a hairline on the built-in Map. For example, you will be able to trace out your property boundary closely and obtain a highly accurate area measurement. 

The Area – Distance app will let you perform the following tasks:

* Precisely digitize Points, Lines and Areas and save them as Features.

* View position, length and area values for the saved Features.

* Label the Lines with segment lengths and directions as well as corner angles.

* Label the Areas with size in acres and square feet or hectares and square meters.

* Measure distances and areas without saving the shapes.

* Move existing nodes to fine-tune the map drawing.

* Create a Point by entering its coordinates.

* Create Points from an imported text file.

* Create a Point or record a node by picking the GPS location.

* Search a location by address or by coordinates.

* Save the job data file for later use.

* Output the drawing and the coordinates to PDF.

* Email the job data files and the PDF files to your colleagues.

This app comes with a detailed built-in help document. It is available from the App Store at:

 http://itunes.apple.com/us/app/distance-area/id571833476?ls=1&mt=8

Click here to see additional screen shots in landscape format. The screens change about every 6-8 seconds. Pretty cool, eh?

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