I am working on numerical modelling over a wide region between 20-50 Eastern longitudes and 30-50 Northern latitudes. I have lat-lon gridded bouguer anomaly and topographical data to use for my studies. Since I need to discretize the area into equal rectangles, I need to convert the data into metric system.
Is it possible to minimize the distortions when reprojecting? I converted the grid data to utm zone 34, It gave fake coordinates out of the zone. Both data fits on each other well on gis softwares. I am curious if I missed something here. After that I will resample it as 1km gridded surface.
Another question is, I am flattening the surface which is originally curved. This is another distortion for me because modelling program will read it as a pure flat surface. Also the rectangles I created will not be perfect rectangles in reality. How can I quantify the error?
thanks in advance.
Dear Mustafa,
As the area is rather big, the distortion have to be. The way to minimize it is to reproject by zones (each part separately) or create your own model for reprojecting which will adjust the appropriate reprojecting rule for each point depends on its location.
Anyway, for the big area the question is to find a balance between acceptable distortion and labor costs...
Hope you'll find the best solution!
you can do it by transferring from the current projection to the desired projection system using ArcGIS toolbox. In that case, you must have the desired projection system with you, which you need to input in the projection transfer system in the toolbox. If your desired projection system is correctly formulated, large distortions won't be occurred. People usually do transfer from LAT-LONG to UTM coordinates using ArcGIS toolbox. Hopefully, it will be helpful for you.
IF you have the parameters of necessary projection systems and datum you could try different approaches. to basically understand it there some video tutorials in You tube,
This process can be applied basically in NY GIS or image processing software if you know the parameters.
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