# Mark GPS coordinates on image file **URL:** \ **Category:** Ruby\ **Created:** [June 18, 2009, 4:45pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535 "2009-06-18T16:45:56Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 18, 2009, 4:45pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/1 "2009-06-18T16:45:56Z")
Hey everybody, I am looking for a way to create a map with GPS coordinates. I have a list with coordinates and I would like to display each of them as a small little dot in an image showing the earth (similar to those little image files Wikipedia uses for cities). Is there something like that? Maybe as a gem? Thanks Flo ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 18, 2009, 6:52pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/2 "2009-06-18T18:52:11Z")
Err, I think you want something that does xmp or exif tagging. ruby-exiv2 is supposed to be able to write out the tags, but I’ve not done used it since I’ve only had to read. For reading, exifr has been really great from my experience. –Kyle ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 18, 2009, 6:53pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/3 "2009-06-18T18:53:22Z")
" but I’ve not done used it"… Wow… always re-read sentances you’ve changed _before_ hitting send… ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 18, 2009, 7:34pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/4 "2009-06-18T19:34:58Z")
Hi On Thu, Jun 18, 2009 at 11:45 AM, Florian Weingarten[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I am looking for a way to create a map with GPS coordinates. I have a list with > coordinates and I would like to display each of them as a small little dot in an > image showing the earth (similar to those little image files Wikipedia uses for > cities). > > Is there something like that? Maybe as a gem? I don’t know any gem to do that, but you have to make a projection of the \ pair to a \ one. There are several methods, see [Map projection - Wikipedia](http://en.wikipedia.org/wiki/Map_projection) . Another option, if you don’t need much accuracy, is to use the coordinates directly as x,y. Bye ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 19, 2009, 7:18am UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/5 "2009-06-19T07:18:44Z")
Hi, I am running PostGIS and use the georuby gem to access the data with ActiveRecord. To display I am running Mapserver and ruby mapscript to provide WMS. Then Openlayers on the webinterface. It works very well and also allows me to use any external GIS program (like quantum gis, udig) to connect and work with the data. Martin ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 20, 2009, 9:34am UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/6 "2009-06-20T09:34:49Z")
On Fri, 2009-06-19 at 19:05 +0900, Florian W. wrote: > Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > To display I am running Mapserver and ruby mapscript to provide WMS. > > Then Openlayers on the webinterface. It works very well and also allows > > Hi Martin, > > that sounds like what I want. Is it a public website? Can I see it? Maybe a > screenshot? Thanks > > Flo It’s unfortunately not public or open source, but feel free to contact me off-list if you should get stuck. The openlayers examples page shows how it can look like: [http://openlayers.org/dev/examples/](http://openlayers.org/dev/examples/) martin ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 19, 2009, 12:05pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/7 "2009-06-19T12:05:54Z")
Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > To display I am running Mapserver and ruby mapscript to provide WMS. > Then Openlayers on the webinterface. It works very well and also allows Hi Martin, that sounds like what I want. Is it a public website? Can I see it? Maybe a screenshot? Thanks Flo ---
**Author:** ![nexflo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/58956e/32.png) [@nexflo](https://www.ruby-forum.com/u/nexflo)\ **Post date:** [June 25, 2009, 1:31pm UTC](https://www.ruby-forum.com/t/mark-gps-coordinates-on-image-file/170535/8 "2009-06-25T13:31:00Z")
Martin B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > It’s unfortunately not public or open source, but feel free to contact > me off-list if you should get stuck. > The openlayers examples page shows how it can look like: > > [http://openlayers.org/dev/examples/](http://openlayers.org/dev/examples/) Hi Martin, I played around with openlayers today. Its very nice, but unfortunately much too slow for me. I want to mark up to several thousands (!) of points on my world map. I would really prefer something that generates me a static image (because the coordinates only change once a day and I dont necessarily need zooming and stuff). Any ideas? Thanks, Flo