I need provider who know GPS and Exis data very well. I need to write a C# program to attach GPS info on pictures in a specified folder. Assume I have Camera and GPS-logger separately. All pictures are in one same folder. GPS data will be provided in csv data. Program should read CSV (GPS data) from beginning to the end. For each GPS data (one data per second), 1) find picture which is taken on closest time. taken time must be within threshold time band. like.. (GPS-time - threshold < timestamp && timestamp < GPS_time + threshold) 2) if picture not found, move to next GPS data. 3). If found picture, Access Picture file, and add following GPS data. Values are provided from CSV(GPS Log). GPS Info IFD GPSLatitudeRef GPSLatitude GPSLongitudeRef GPSLongitude GPSAltitudeRef GPSAltitude GPSTimeStamp GPSSatellites GPSStatus GPSMeasureMode GPSDOP I'd like to do by myself, but I'm first time to handle EXIF info on picture file, so I will post job here. Regarding GPS data, I can answer any question. Actually, this program will inport two kinds of GPS-log. But I will write a wrapper to handle both types of GPS log, and give plain CSV to your code. Budget is near $500. Best Regards and thanks, Naoki Desired Skills: .NET, C#, Exif, GPS, image format Keywords: Other IT & Programming, C#, image, format, GPS, Exif, .NET