GPS Tracklog in iCMTGIS III

“During field visits the tracklog is not visible on the map. The tracklog has been activated, as well as the GPS. The symbology of the line is different from the background color. Is it possible that we are hanging a box that makes the tracklog invisible? How to keep track of your track at all times?”

Under Setup – Navigation, you can turn on the display of the trail. Trail length is limited to 1000. After 1000 seconds, the older GPS fixes will not be displayed, and the trail continues on with the new GPS fixes. The complete Tracklog will display when it has ended.


How to change the Topic Pattern in iCMTGIS PRO?

To change the symbol assignment for a Topic, first turn on Topic View. Then double-tap on the existing symbol displayed by the Topic name. The screen for selecting the symbol and color for the Topic will be displayed.

This procedure is the same for our apps that provide the Topic View.

Issue with Feature ID when combining job data

“it happens that two colleagues work on the same project at the same time on two application and two different tablets. When I save their project I give them different names eg MNAR-108_1 MNAR_108_2. When I view them both at the same time on PC-GIS the numbers of the features are changed. I understand that it avoids duplicates, but how can I assemble projects while keeping the original feature numbers?”

Assume that the two colleagues working on the same project at the same time on two different tablets collect Features using the same Feature Topic name. For example, Colleague A records the position of a point, and the Feature ID is Point001. Colleague B records a different point, and the Feature ID is Point001. If you combine their jobs in PC-GIS, the Feature ID of the points imported last will be changed to avoid duplicates. To keep the original Feature IDs when you combine jobs, the two sets of Feature IDs must be different. If there are fewer than 100 points that each colleague will be recording, then one way is to have Colleague A record points starting from Point001, and have Colleague B record points starting from Point100. (Colleague B can change the Point001 automatically presented by the app to Point100 when he/she collects the first point. Then the app will automatically present Point101 as the next Feature ID.)

iPhone app for locating fence line and property boundary

“I have a ranch in Colorado that is relatively isolated. When at the ranch, I do not have internet or phone service. The property has metes and bounds descriptions for the boundaries. I am interested in acquiring your software application to confirm the location of fences and the property lines. Will this app function on my iPhone without internet access? Will the Deed Calls and Stakeout App perform the functions that I need to identify boundaries?”

You do not need Internet access for our apps or the GPS on your iPhone to work.

The Apple Map does need Internet access to be refreshed. However, you could load the Apple Map while you are at your office and cache it for use on site.

Some of our apps, such as the iCMTGIS III and iCMTGIS PRO, will let you load a GeoTiff map to use as an off-line Background Map.

The Deed Calls & Stakeout app will let you input the metes and bounds descriptions to draw the boundaries. For the boundary to be correctly placed on the map, you will need to provide an initial position and the your local magnetic declination angle.

Then, you can select the boundary and use the Line Stakeout function to help you walk along the boundary to confirm its location.

Please be aware that the iPhone GPS is not very accurate. An external GPS receiver such as the Dual XGPS-150A or a Bad Elf GPS can get 2-5 m accuracy. There are also expensive external GPS receivers that can provide sub-meter or even cm-level accuracy.

Can the filename text box for opening a Job file in iCMTGIS PRO be made longer?

It is cumbersome to work with very long file names. Some backup programs will even balk at very long filenames. That said, we could make the filename text box for the iPad version of iCMTGIS PRO somewhat longer.

How to record points for contouring an area using iCMTGIS PRO

“I went to GPS > Collect, but I might have collected a line after that, rather than a traverse. Would that still be usable to generate contours?”

1. You can disconnect a Line Feature into Point Features by selecting that Line then using Utilities > Disconnect. Each node of a Line Feature is just one GPS fix. It may not be that accurate.

2. GPS > Collect > Traverse > Store will let you select a reference (starting Point) then enter slope distance, slope angle and bearing to create a new Point. You could generate new points this way when GPS signals are weak.

3. To properly record points for contouring, you will want to use GPS > Collect and record each point for a session of at least 30 seconds to obtain an averaged position. Generally, a longer session time results in better accuracy.

4. One thing to keep in mind is that vertical distance accuracy of GPS receivers is generally 3 times worse than horizontal distance accuracy.

Projection for exporting Shapefiles

“When exporting a shapefile from ICMTGIS II, is it possible to specify the projection of the exported file or will it always be in the same projection as the job?”

Shapefiles will always be exported in the currently active projection. You can switch to the desired coordinate system or projection before exporting the Shapefiles.