2 Replies Latest reply on Jul 17, 2016 12:07 AM by weaverd

    Marking/drawing atop a graphic



      Marking/drawing atop a graphic


           Hi, I have a little app for foresters who generally use their iPad Minis out in the deep woods without internet access. I am able to cache maps from Google for them before-hand, including the relevant pre-loaded lats and longs they intend to visit, and I'd like to have atop those graphic files a FileMaker Go-drawn set of indicators of some lats and longs that they are adding as they go along. 

           I can sort of do this by superimposing a scatter plot chart of lats and longs customized to a transparent background on top of a graphic held in a container, but as the locations of the points inside this square change, the two elements get out of alignment (we have complete control over the Google map, but the Filemaker chart appears to jitter around a bit, even if you have the same four extreme corners set as points within the chart consistently. Something about the other points in the chart moving about makes Filemaker push the chart graphic a little here and there.)

           A screenshot is included here of the little green dots from a scatter plot map I have superimposed on a google map. It works fine for a single set of points and scale, but not for a variable set of points.

           So I'm asking if there is a different way of somehow having control over a graphic or layout element that would allow us to effectively draw dots or pins, etc. atop a graphic file? We know precisely how many pixels over we need to draw the dots; it's just that we need control over some layout object or other element that we can move around visually. Anyone have any ideas?


           Thanks for your help, -Tig








        • 1. Re: Marking/drawing atop a graphic



          Don't know if you ever solved this but here is an interesting link:



          • 2. Re: Marking/drawing atop a graphic

            Have you considered using a purpose built GIS app for this? I also manage a team of staff collecting soil samples where there is little or no internet connectivity. The staff use a combination of tools on iPad and iPhone to get the job done. On their iPads they utilise a FileMaker solution to collect geo-coordinates representing a sampling transect - no internet connectivity required, just need to be able to acquire a GPS signal. On their iPhone they use a tool called CartoMobile. It can be preloaded with shapefiles (points, lines, polygons) and imagery so the staff know where they are going. It is also possible to modify the shapefiles using forms to capture new data, or geo-coordinates if you wish. All of the necessary data for CartoMobile can be prepared in advance using open source GIS solutions such as QGIS assuming you have access to some imagery. The dbf part of the shape file (essentially the table) can then be manipulated using FileMaker back in the office to integrate the field data into your solution, or alternatively CartoMobile can integrate with spatial data infrastructure to get that done.