DISCLAIMER- WE ARE IN NO WAY ADVERTISING EXPERTGPS SOFTWARE
This
is a follow up on the previous post in which we used google earth to
add scanned paper maps to the GPS receiver; this time around, we will
use ExpertGPS software to run the process.
ExpertGPS is a great software we discovered a while ago. The drawback is that its
subscription based meaning it is not free but comes with a 250 US dollar
price tag to get a full featured package. Notwithstanding, it is an
excellent software that makes working with GPS data easy. For those who
wish to practice, you can download the one week trial version online.
Task
We will demonstrate to you how to add scanned paper maps to our Garmin Dakota
GPS. Our custom map is a section of a topo map and we will be
uploading it as a KMZ file into the GPS receiver.
Note that the GPS receiver should be capable of receiving custom maps. Not all GPS receivers have this functionality.
Scan at > 109 dpi and save as jpeg image file.
Steps
- Prepare the paper map for calibration in ExpertGPS
- Send the map to the GPS receiver as a KMZ file
Procedure using Expert GPS software
1. The paper map should be scanned at a resolution of 110pixels. Our
paper map is the south-western section of the 1:50,000 topographic sheet
centered at Ahoro/Oniyangi axis.
2.
A dialog box to fill name and projection will pop up. Fill a name and
click Add button (red boxed)to adjust the projection parameters.
3. This dialog box will open. (For Nigeria) Select Africa>Format to Decimal Degrees
4.
The calibration circles (red boxed) are in the far right corner. click
on them one by one and go to the map and select locations of your
control points. there are three calibration circles. The green box is
the location of our first calibration point.
5.
When one clicks on the location of the control points with the
calibration tool, an Edit Calibration Point dialog box comes up. Fill in
the coordinates of that control point and click OK.
You will do this for the three calibration points.
6.
Go to GPS on the main menu >Send Maps to GPS. A yellow box will
define the size of custom tiles that the receiver can take at a time.
One can make several tiles and send to make up the whole area. The Send
Maps to GPS dialog box will open. Make sure you check the Data Overlays
option. Click Send Map
7.
In the Save As dialog box navigate to your GPS receiver
Drive>Garmin> CustomMaps folder and save. If it is not there,
create one. (this is representative of a Garmin GPS)
8. This is a screenshot of the scanned map in the GPS receiver map display.
Though
a paid for software, ExpertGPS makes working with GPS data and the GPS
receiver simpler. We would recommend it any day
especially if its an organization or institution that intends to use it.
Practice, practice and practice and lets have your feedback.
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