View Full Version : how to increase speed showing my recorded GPS-locations?

08-14-2002, 06:03 AM
I made a blackbox for my car that records lots of GPS strings in a flashmemory . I can download this memory to my computer and then I want to show the route I made on the map.
I tried many things but cannot show more then 2 points per second. If I try, it seems that mappoint is not fast enough to show them on the screen.
My computer is rather old (P2 , 266 Mhz ) , but before I used a VB program that used a normal (scanned) map and I had great speeds while drawing the route.
Until now I placed 1 pushpin (car symbol) on the map and changed it's location.Unfortunaly I can not reach high speeds to check the route that my car made .
Does anyone have idea's to increase speed?

Second question...

Importing some datasets take's also a lot of time.(+/- 1 minute)
Can I import a dataset from an existing array in my program that contains GPS-data?
now I have to write this array to my hardisk as a text file and after use the dataset import possibilities.

Thanks a lot for all help!!!

Best regards,

Wim Verlinden

08-14-2002, 09:23 AM
Why do you use mappoint to store a tracklog? I'm sure there are other programs who can do that, or just build your own program, it isn't very difficult if you know the NMEA syntax.

But I'm not sure at wich interval the GPS receiver sends its position using the NMEA interface. Maybe every 2 seconds? Then you're out of luck. Maybe the Garmin interface sends the position more often, but MapPoint is only compatible with the NMEA interface (stupid, but just write your own COM add-in which reads the Garmin signals - lots of work, maybe).

08-14-2002, 10:25 AM
Hi Evert ,

Thanks for info and code!
I use mappoint not to store the GPS-data (data stored as text file on my harddisk) , but when the car arrives , I would like to see (quickly) where it has been.
For example if the blackbox samples location every 10 seconds and the car drives for 8 hours then I have about 2880 locations stored ( +/- 187 kB). This 8 hours driving is what I would like to show in Mappoint as quickly as possible.
I could show 20 points per second on a scanned map and now I would like to do the same in Mappoint.....

Thanks again,


08-14-2002, 10:34 AM
try http://www.gpsu.co.uk/features.html i'm not familiar with it but maybe it's useful for you :?:

08-22-2002, 03:41 PM
The import capability is much faster than looping through the 28,000 records and plotting the pushpin locations. Mappoint should be able to import a properly formatted file containing the number of data points that you have in about a minute. You can write code to do this, or use the built in import capability.

08-24-2002, 04:10 AM
Yes , last days I import a datamap by program and it's much faster.It takes about 15 seconds.