Looking for software to find height on a track

[frehr]

I have got a jobdesciption that says: Fly along this given track 17 km (KMLfile). Then find the height on that track.
I have to take photos with an overlap of 80%

I know there are several different apps that will do that (dronedeploy etc) .
I will not get a lot of these jobs in the furute, and therefor I want the cheapest and easiest solution.
Hit me! )

 

[CSI Don]

Maps made easy. Has a movable home option and terrain following in the more advanced subscription. Sorry for the late reply, I only check this site once a week (Saturdays mostly). it may be difficult to do corridor flights, but it can be done. The other app is UGCS, but it requires a PC to plan the mission. Not sure about Litchie (I haven't used it). Hope this helps.